Generating a list of pages (not posts) without the index file

I can offer you a jquery solution

add this in your <head></head> tag

<script type="text/javascript" src="http://code.jquery.com/jquery-1.10.2.min.js"></script>

add this after </ul>

 <script> $('ul li:first').remove(); </script>

Querying date field in MongoDB with Mongoose

{ "date" : "1000000" } in your Mongo doc seems suspect. Since it's a number, it should be { date : 1000000 }

It's probably a type mismatch. Try post.findOne({date: "1000000"}, callback) and if that works, you have a typing issue.

How can I solve the error 'TS2532: Object is possibly 'undefined'?

Edit / Update:

If you are using Typescript 3.7 or newer you can now also do:

    const data = change?.after?.data();

    if(!data) {
      console.error('No data here!');
       return null
    }

    const maxLen = 100;
    const msgLen = data.messages.length;
    const charLen = JSON.stringify(data).length;

    const batch = db.batch();

    if (charLen >= 10000 || msgLen >= maxLen) {

      // Always delete at least 1 message
      const deleteCount = msgLen - maxLen <= 0 ? 1 : msgLen - maxLen
      data.messages.splice(0, deleteCount);

      const ref = db.collection("chats").doc(change.after.id);

      batch.set(ref, data, { merge: true });

      return batch.commit();
    } else {
      return null;
    }

Original Response

Typescript is saying that change or data is possibly undefined (depending on what onUpdate returns).

So you should wrap it in a null/undefined check:

if(change && change.after && change.after.data){
    const data = change.after.data();

    const maxLen = 100;
    const msgLen = data.messages.length;
    const charLen = JSON.stringify(data).length;

    const batch = db.batch();

    if (charLen >= 10000 || msgLen >= maxLen) {

      // Always delete at least 1 message
      const deleteCount = msgLen - maxLen <= 0 ? 1 : msgLen - maxLen
      data.messages.splice(0, deleteCount);

      const ref = db.collection("chats").doc(change.after.id);

      batch.set(ref, data, { merge: true });

      return batch.commit();
    } else {
      return null;
    }
}

If you are 100% sure that your object is always defined then you can put this:

const data = change.after!.data();

Pandas Merging 101

This post will go through the following topics:

how to correctly generalize to multiple DataFrames (and why merge has shortcomings here)
merging on unique keys
merging on non-unqiue keys

_{BACK TO TOP}

Generalizing to multiple DataFrames

Oftentimes, the situation arises when multiple DataFrames are to be merged together. Naively, this can be done by chaining merge calls:

df1.merge(df2, ...).merge(df3, ...)

However, this quickly gets out of hand for many DataFrames. Furthermore, it may be necessary to generalise for an unknown number of DataFrames.

Here I introduce pd.concat for multi-way joins on unique keys, and DataFrame.join for multi-way joins on non-unique keys. First, the setup.

# Setup.
np.random.seed(0)
A = pd.DataFrame({'key': ['A', 'B', 'C', 'D'], 'valueA': np.random.randn(4)})    
B = pd.DataFrame({'key': ['B', 'D', 'E', 'F'], 'valueB': np.random.randn(4)})
C = pd.DataFrame({'key': ['D', 'E', 'J', 'C'], 'valueC': np.ones(4)})
dfs = [A, B, C] 

# Note, the "key" column values are unique, so the index is unique.
A2 = A.set_index('key')
B2 = B.set_index('key')
C2 = C.set_index('key')

dfs2 = [A2, B2, C2]

Multiway merge on unique keys

If your keys (here, the key could either be a column or an index) are unique, then you can use pd.concat. Note that pd.concat joins DataFrames on the index.

# merge on `key` column, you'll need to set the index before concatenating
pd.concat([
    df.set_index('key') for df in dfs], axis=1, join='inner'
).reset_index()

  key    valueA    valueB  valueC
0   D  2.240893 -0.977278     1.0

# merge on `key` index
pd.concat(dfs2, axis=1, sort=False, join='inner')

       valueA    valueB  valueC
key                            
D    2.240893 -0.977278     1.0

Omit join='inner' for a FULL OUTER JOIN. Note that you cannot specify LEFT or RIGHT OUTER joins (if you need these, use join, described below).

Multiway merge on keys with duplicates

concat is fast, but has its shortcomings. It cannot handle duplicates.

A3 = pd.DataFrame({'key': ['A', 'B', 'C', 'D', 'D'], 'valueA': np.random.randn(5)})

pd.concat([df.set_index('key') for df in [A3, B, C]], axis=1, join='inner')
ValueError: Shape of passed values is (3, 4), indices imply (3, 2)

In this situation, we can use join since it can handle non-unique keys (note that join joins DataFrames on their index; it calls merge under the hood and does a LEFT OUTER JOIN unless otherwise specified).

# join on `key` column, set as the index first
# For inner join. For left join, omit the "how" argument.
A.set_index('key').join(
    [df.set_index('key') for df in (B, C)], how='inner').reset_index()

  key    valueA    valueB  valueC
0   D  2.240893 -0.977278     1.0

# join on `key` index
A3.set_index('key').join([B2, C2], how='inner')

       valueA    valueB  valueC
key                            
D    1.454274 -0.977278     1.0
D    0.761038 -0.977278     1.0

Continue Reading

Jump to other topics in Pandas Merging 101 to continue learning:

_{* you are here}

React Hook Warnings for async function in useEffect: useEffect function must return a cleanup function or nothing

I suggest to look at Dan Abramov (one of the React core maintainers) answer here:

I think you're making it more complicated than it needs to be.

function Example() {
  const [data, dataSet] = useState<any>(null)

  useEffect(() => {
    async function fetchMyAPI() {
      let response = await fetch('api/data')
      response = await response.json()
      dataSet(response)
    }

    fetchMyAPI()
  }, [])

  return <div>{JSON.stringify(data)}</div>
}

Longer term we'll discourage this pattern because it encourages race conditions. Such as — anything could happen between your call starts and ends, and you could have gotten new props. Instead, we'll recommend Suspense for data fetching which will look more like

const response = MyAPIResource.read();

and no effects. But in the meantime you can move the async stuff to a separate function and call it.

You can read more about experimental suspense here.

If you want to use functions outside with eslint.

 function OutsideUsageExample() {
  const [data, dataSet] = useState<any>(null)

  const fetchMyAPI = useCallback(async () => {
    let response = await fetch('api/data')
    response = await response.json()
    dataSet(response)
  }, [])

  useEffect(() => {
    fetchMyAPI()
  }, [fetchMyAPI])

  return (
    <div>
      <div>data: {JSON.stringify(data)}</div>
      <div>
        <button onClick={fetchMyAPI}>manual fetch</button>
      </div>
    </div>
  )
}

If you will use useCallback, look at example of how it works useCallback. Sandbox.

import React, { useState, useEffect, useCallback } from "react";

export default function App() {
  const [counter, setCounter] = useState(1);

  // if counter is changed, than fn will be updated with new counter value
  const fn = useCallback(() => {
    setCounter(counter + 1);
  }, [counter]);

  // if counter is changed, than fn will not be updated and counter will be always 1 inside fn
  /*const fnBad = useCallback(() => {
      setCounter(counter + 1);
    }, []);*/

  // if fn or counter is changed, than useEffect will rerun
  useEffect(() => {
    if (!(counter % 2)) return; // this will stop the loop if counter is not even

    fn();
  }, [fn, counter]);

  // this will be infinite loop because fn is always changing with new counter value
  /*useEffect(() => {
    fn();
  }, [fn]);*/

  return (
    <div>
      <div>Counter is {counter}</div>
      <button onClick={fn}>add +1 count</button>
    </div>
  );
}

'pip install' fails for every package ("Could not find a version that satisfies the requirement")

Support for TLS 1.0 and 1.1 was dropped for PyPI. If your system does not use a more recent version, it could explain your error.

Could you try reinstalling pip system-wide, to update your system dependencies to a newer version of TLS?

This seems to be related to Unable to install Python libraries

See Dominique Barton's answer:

Apparently pip is trying to access PyPI via HTTPS (which is encrypted and fine), but with an old (insecure) SSL version. Your system seems to be out of date. It might help if you update your packages.

On Debian-based systems I'd try:
apt-get update && apt-get upgrade python-pip
On Red Hat Linux-based systems:
yum update python-pip # (or python2-pip, at least on Red Hat Linux 7)
On Mac:
sudo easy_install -U pip
You can also try to update openssl separately.

React-Redux: Actions must be plain objects. Use custom middleware for async actions

You have to dispatch after the async request ends.

This would work:

export function bindComments(postId) {
    return function(dispatch) {
        return API.fetchComments(postId).then(comments => {
            // dispatch
            dispatch({
                type: BIND_COMMENTS,
                comments,
                postId
            });
        });
    };
}

Angular - ng: command not found

Windows 10 Only

If you are using Git Bash and also you are sure that you have done all steps that are listed above, still getting an error like this, run following command:

alias ng="C:/Users/<your-username>/AppData/Roaming/npm/node_modules/@angular/cli/bin/ng"

then run ng -v

Finally, it works if you see the version of Angular-CLI

Laravel 5.5 ajax call 419 (unknown status)

some refs =>

...
<head>
    // CSRF for all ajax call
    <meta name="csrf-token" content="{{ csrf_token() }}" />
</head>
 ...
 ...
<script>
    // CSRF for all ajax call
    $.ajaxSetup({ headers: { 'X-CSRF-TOKEN': jQuery('meta[name="csrf-token"]').attr('content') } });
</script>
...

TypeScript error TS1005: ';' expected (II)

I had today a similar error message. What was peculiar is that it did not break the Application. It was running smoothly but the command prompt (Windows machine) indicated there was an error. I did not update the Typescript version but found another culprit. It turned there was a tiny omission of symbol - closing ")", which I believe The Typescript is compensating for. Just for reference the code is the following:

[new Object('First Characteristic','Second Characteristic',
'Third Characteristic'*] 

* notice here the ending ")" is missing.

Once brought back no more issues on the command prompt!

How do I test axios in Jest?

I could do that following the steps:

Create a folder __mocks__/ (as pointed by @Januartha comment)
Implement an axios.js mock file
Use my implemented module on test

The mock will happen automatically

Example of the mock module:

module.exports = {
    get: jest.fn((url) => {
        if (url === '/something') {
            return Promise.resolve({
                data: 'data'
            });
        }
    }),
    post: jest.fn((url) => {
        if (url === '/something') {
            return Promise.resolve({
                data: 'data'
            });
        }
        if (url === '/something2') {
            return Promise.resolve({
                data: 'data2'
            });
        }
    }),
    create: jest.fn(function () {
        return this;
    })
};

Angular 4/5/6 Global Variables

Not really recommended but none of the other answers are really global variables. For a truly global variable you could do this.

Index.html

<body>
  <app-root></app-root>
  <script>
    myTest = 1;
  </script>
</body>

Component or anything else in Angular

..near the top right after imports:

declare const myTest: any;

...later:

console.warn(myTest); // outputs '1'

re.sub erroring with "Expected string or bytes-like object"

I suppose better would be to use re.match() function. here is an example which may help you.

import re
import nltk
from nltk.tokenize import word_tokenize
nltk.download('punkt')
sentences = word_tokenize("I love to learn NLP \n 'a :(")
#for i in range(len(sentences)):
sentences = [word.lower() for word in sentences if re.match('^[a-zA-Z]+', word)]  
sentences

General error: 1364 Field 'user_id' doesn't have a default value

I've had a similar issue with User registration today and I was getting a

SQLSTATE[HY000]: General error: 1364 Field 'password' doesn't have a default value (SQL: insert into users

I fixed it by adding password to my protected $fillable array and it worked

protected $fillable = [
  'name',
  'email',
  'password',
];

I hope this helps.

CORS: credentials mode is 'include'

The issue stems from your Angular code:

When withCredentials is set to true, it is trying to send credentials or cookies along with the request. As that means another origin is potentially trying to do authenticated requests, the wildcard ("*") is not permitted as the "Access-Control-Allow-Origin" header.

You would have to explicitly respond with the origin that made the request in the "Access-Control-Allow-Origin" header to make this work.

I would recommend to explicitly whitelist the origins that you want to allow to make authenticated requests, because simply responding with the origin from the request means that any given website can make authenticated calls to your backend if the user happens to have a valid session.

I explain this stuff in this article I wrote a while back.

So you can either set withCredentials to false or implement an origin whitelist and respond to CORS requests with a valid origin whenever credentials are involved

Cannot read property 'style' of undefined -- Uncaught Type Error

Add your <script> to the bottom of your <body>, or add an event listener for DOMContentLoaded following this StackOverflow question.

If that script executes in the <head> section of the code, document.getElementsByClassName(...) will return an empty array because the DOM is not loaded yet.

You're getting the Type Error because you're referencing search_span[0], but search_span[0] is undefined.

This works when you execute it in Dev Tools because the DOM is already loaded.

How to solve npm error "npm ERR! code ELIFECYCLE"

A possibly unexpected cause: you use Create React App with some warnings left unfixed, and the project fails on CI (e.g. GitLab CI/CD):

Treating warnings as errors because process.env.CI = true.
[ ... some warnings here ...]
npm ERR! code ELIFECYCLE
npm ERR! errno 1

Solution: fix yo' warnings!

Alternative: use CI=false npm run build

See CRA issue #3657

^{(Ashamed to admit that it just happened to me; did not see it until a colleague pointed it out. Thanks Pascal!)}

Cleanest way to reset forms

You can also do it through the JavaScript:

(document.querySelector("form_selector") as HTMLFormElement).reset();

How to determine previous page URL in Angular?

@GünterZöchbauer also you can save it in localstorage but I not prefer it ) better to save in service and get this value from there

 constructor(
        private router: Router
      ) {
        this.router.events
          .subscribe((event) => {
            if (event instanceof NavigationEnd) {
              localStorage.setItem('previousUrl', event.url);
            }
          });
      }

Bootstrap footer at the bottom of the page

When using bootstrap 4 or 5, flexbox could be used to achieve desired effect:

<body class="d-flex flex-column min-vh-100">
    <header>HEADER</header>
    <content>CONTENT</content>
    <footer class="mt-auto"></footer>
</body>

Please check the examples: Bootstrap 4 Bootstrap 5

In bootstrap 3 and without use of bootstrap. The simplest and cross browser solution for this problem is to set a minimal height for body object. And then set absolute position for the footer with bottom: 0 rule.

body {
  min-height: 100vh;
  position: relative;
  margin: 0;
  padding-bottom: 100px; //height of the footer
  box-sizing: border-box;
}

footer {
  position: absolute;
  bottom: 0;
  height: 100px;
}

Please check this example: Bootstrap 3

Eloquent: find() and where() usage laravel

Not Found Exceptions

Sometimes you may wish to throw an exception if a model is not found. This is particularly useful in routes or controllers. The findOrFail and firstOrFail methods will retrieve the first result of the query. However, if no result is found, a Illuminate\Database\Eloquent\ModelNotFoundException will be thrown:

$model = App\Flight::findOrFail(1);

$model = App\Flight::where('legs', '>', 100)->firstOrFail();

If the exception is not caught, a 404 HTTP response is automatically sent back to the user. It is not necessary to write explicit checks to return 404 responses when using these methods:

Route::get('/api/flights/{id}', function ($id) {
    return App\Flight::findOrFail($id);
});

Observable Finally on Subscribe

The only thing which worked for me is this

fetchData()
  .subscribe(
    (data) => {
       //Called when success
     },
    (error) => {
       //Called when error
    }
  ).add(() => {
       //Called when operation is complete (both success and error)
  });

How do I select which GPU to run a job on?

Set the following two environment variables:

NVIDIA_VISIBLE_DEVICES=$gpu_id
CUDA_VISIBLE_DEVICES=0

where gpu_id is the ID of your selected GPU, as seen in the host system's nvidia-smi (a 0-based integer) that will be made available to the guest system (e.g. to the Docker container environment).

You can verify that a different card is selected for each value of gpu_id by inspecting Bus-Id parameter in nvidia-smi run in a terminal in the guest system).

More info

This method based on NVIDIA_VISIBLE_DEVICES exposes only a single card to the system (with local ID zero), hence we also hard-code the other variable, CUDA_VISIBLE_DEVICES to 0 (mainly to prevent it from defaulting to an empty string that would indicate no GPU).

Note that the environmental variable should be set before the guest system is started (so no chances of doing it in your Jupyter Notebook's terminal), for instance using docker run -e NVIDIA_VISIBLE_DEVICES=0 or env in Kubernetes or Openshift.

If you want GPU load-balancing, make gpu_id random at each guest system start.

If setting this with python, make sure you are using strings for all environment variables, including numerical ones.

You can verify that a different card is selected for each value of gpu_id by inspecting nvidia-smi's Bus-Id parameter (in a terminal run in the guest system).

The accepted solution based on CUDA_VISIBLE_DEVICES alone does not hide other cards (different from the pinned one), and thus causes access errors if you try to use them in your GPU-enabled python packages. With this solution, other cards are not visible to the guest system, but other users still can access them and share their computing power on an equal basis, just like with CPU's (verified).

This is also preferable to solutions using Kubernetes / Openshift controlers (resources.limits.nvidia.com/gpu), that would impose a lock on the allocated card, removing it from the pool of available resources (so the number of containers with GPU access could not exceed the number of physical cards).

This has been tested under CUDA 8.0, 9.0 and 10.1 in docker containers running Ubuntu 18.04 orchestrated by Openshift 3.11.

R multiple conditions in if statement

Read this thread R - boolean operators && and ||.

Basically, the & is vectorized, i.e. it acts on each element of the comparison returning a logical array with the same dimension as the input. && is not, returning a single logical.

Correctly Parsing JSON in Swift 3

Swift has a powerful type inference. Lets get rid of "if let" or "guard let" boilerplate and force unwraps using functional approach:

Here is our JSON. We can use optional JSON or usual. I'm using optional in our example:

let json: Dictionary<String, Any>? = ["current": ["temperature": 10]]

Helper functions. We need to write them only once and then reuse with any dictionary:

/// Curry
public func curry<A, B, C>(_ f: @escaping (A, B) -> C) -> (A) -> (B) -> C {
    return { a in
        { f(a, $0) }
    }
}

/// Function that takes key and optional dictionary and returns optional value
public func extract<Key, Value>(_ key: Key, _ json: Dictionary<Key, Any>?) -> Value? {
    return json.flatMap {
        cast($0[key])
    }
}

/// Function that takes key and return function that takes optional dictionary and returns optional value
public func extract<Key, Value>(_ key: Key) -> (Dictionary<Key, Any>?) -> Value? {
    return curry(extract)(key)
}

/// Precedence group for our operator
precedencegroup RightApplyPrecedence {
    associativity: right
    higherThan: AssignmentPrecedence
    lowerThan: TernaryPrecedence
}

/// Apply. g § f § a === g(f(a))
infix operator § : RightApplyPrecedence
public func §<A, B>(_ f: (A) -> B, _ a: A) -> B {
    return f(a)
}

/// Wrapper around operator "as".
public func cast<A, B>(_ a: A) -> B? {
    return a as? B
}

And here is our magic - extract the value:

let temperature = (extract("temperature") § extract("current") § json) ?? NSNotFound

Just one line of code and no force unwraps or manual type casting. This code works in playground, so you can copy and check it. Here is an implementation on GitHub.

Spring Boot @Value Properties

I had the same issue get value for my property in my service class. I resolved it by using @ConfigurationProperties instead of @Value.

create a class like this:

    import org.springframework.boot.context.properties.ConfigurationProperties;

    @ConfigurationProperties(prefix = "file")
    public class FileProperties {
        private String directory;

        public String getDirectory() {
            return directory;
        }

        public void setDirectory(String dir) {
            this.directory = dir;
        }
    }

add the following to your BootApplication class:

    @EnableConfigurationProperties({
        FileProperties.class
    })

Inject FileProperties to your PrintProperty class, then you can get hold of the property through the getter method.

How to fix error Base table or view not found: 1146 Table laravel relationship table?

try checking in the app if you are using the tables before it's created such as appServiceProvider.php

you might be calling the table without being created it, if you are, comment it then run php artisan migrate.

Upgrade version of Pandas

Simple Solution, just type the below:

conda update pandas

Type this in your preferred shell (on Windows, use Anaconda Prompt as administrator).

"Uncaught (in promise) undefined" error when using with=location in Facebook Graph API query

The error tells you that there is an error but you don´t catch it. This is how you can catch it:

getAllPosts().then(response => {
    console.log(response);
}).catch(e => {
    console.log(e);
});

You can also just put a console.log(reponse) at the beginning of your API callback function, there is definitely an error message from the Graph API in it.

More information: https://developer.mozilla.org/de/docs/Web/JavaScript/Reference/Global_Objects/Promise/catch

Or with async/await:

//some async function
try {
    let response = await getAllPosts();
} catch(e) {
    console.log(e);
}

What does 'Unsupported major.minor version 52.0' mean, and how do I fix it?

Your code was compiled with Java 8.

Either compile your code with an older JDK (compliance level) or run it on a Java 8 JRE.

Hope this helps...

Why does .json() return a promise?

In addition to the above answers here is how you might handle a 500 series response from your api where you receive an error message encoded in json:

function callApi(url) {
  return fetch(url)
    .then(response => {
      if (response.ok) {
        return response.json().then(response => ({ response }));
      }

      return response.json().then(error => ({ error }));
    })
  ;
}

let url = 'http://jsonplaceholder.typicode.com/posts/6';

const { response, error } = callApi(url);
if (response) {
  // handle json decoded response
} else {
  // handle json decoded 500 series response
}

ImportError: No module named 'google'

Close Anaconda/Spyder
Open command prompt and run the below command
conda update --all
Start the app again and this time it should work.

Note - You need not have to uninstall/reinstall anything.

Send multipart/form-data files with angular using $http

In Angular 6, you can do this:

In your service file:

 function_name(data) {
    const url = `the_URL`;
    let input = new FormData();
    input.append('url', data);   // "url" as the key and "data" as value
    return this.http.post(url, input).pipe(map((resp: any) => resp));
  }

In component.ts file: in any function say xyz,

xyz(){
this.Your_service_alias.function_name(data).subscribe(d => {   // "data" can be your file or image in base64 or other encoding
      console.log(d);
    });
}

How to unpublish an app in Google Play Developer Console

There are two ways to delete an application you have uploaded from the Google Play Developer Console based off of the application's status within the Console. An app's status can be viewed from the "All Applications" tab listed in the furthest column. (See below)

If your app has not yet been published to the Google Play store (ie. Is still a draft):

Select your app from the list and at the top of the page, underneath your application name, it will say DRAFT in blue with the super low-profile option to delete it just to the right. Observe below:

Click that and you're done! Keep in mind: all of the work you have put into this application so far will be deleted from the Google Play Developer Console.

If your app has already been published and you want to remove it from the app store:

This method is similar, however it should be noted that it is not possible to permanently delete an app from your Developer Console once it has been published to the Play Store.

1) Select the application you would like to publish from the "All Applications" tab on the right of the screen

2) Below the title of the app, similar to how it was with the DRAFT application, there will be super low-profile text allowing you the option to unpublish your app from the Play Store. This process "may take a few hours to complete" as it is said by the Developer Console.

(Pictures on the way. As you have seen, my example app is still pending publication, lol)

I hope this helps to answer some people's questions.

In Flask, What is request.args and how is it used?

According to the flask.Request.args documents.

flask.Request.args
A MultiDict with the parsed contents of the query string. (The part in the URL after the question mark).

So the args.get() is method get() for MultiDict, whose prototype is as follows:

get(key, default=None, type=None)

Update:
In newer version of flask (v1.0.x and v1.1.x), flask.Request.args is an ImmutableMultiDict(an immutable MultiDict), so the prototype and specific method above is still valid.

Use a.any() or a.all()

You comment:

valeur is a vector equal to [ 0. 1. 2. 3.] I am interested in each single term. For the part below 0.6, then return "this works"....

If you are interested in each term, then write the code so it deals with each. For example.

for b in valeur<=0.6:
    if b:
        print ("this works")
    else:   
        print ("valeur is too high")

This will write 2 lines.

The error is produced by numpy code when you try to use it a context that expects a single, scalar, value. if b:... can only do one thing. It does not, by itself, iterate through the elements of b doing a different thing for each.

You could also cast that iteration as list comprehension, e.g.

['yes' if b else 'no' for b in np.array([True, False, True])]

Angular2 QuickStart npm start is not working correctly

For Ubuntu 16.x users, installing latest version 5.x solves my issue in ubuntu

curl -sL https://deb.nodesource.com/setup_5.x | sudo -E bash -
sudo apt-get install -y nodejs

OkHttp Post Body as JSON

Just use JSONObject.toString(); method. And have a look at OkHttp's tutorial:

public static final MediaType JSON
    = MediaType.parse("application/json; charset=utf-8");

OkHttpClient client = new OkHttpClient();

String post(String url, String json) throws IOException {
  RequestBody body = RequestBody.create(JSON, json); // new
  // RequestBody body = RequestBody.create(JSON, json); // old
  Request request = new Request.Builder()
      .url(url)
      .post(body)
      .build();
  Response response = client.newCall(request).execute();
  return response.body().string();
}

Failed to authenticate on SMTP server error using gmail

I had the same issue, but when I ran the following command, it was ok:

php artisan config:cache

Connecting to Microsoft SQL server using Python

here's the one that works for me:

from sqlalchemy import create_engine
import urllib

conn_str = (
r'Driver=ODBC Driver 13 for SQL Server;'
r'Server=DefinitelyNotProd;'
r'Database=PlayPen;'
r'Trusted_Connection=Yes;')

quoted_conn_str = urllib.parse.quote_plus(conn_str)
engine = create_engine('mssql+pyodbc:///?odbc_connect={}'.format(quoted_conn_str))

Push items into mongo array via mongoose

An easy way to do that is to use the following:

var John = people.findOne({name: "John"});
John.friends.push({firstName: "Harry", lastName: "Potter"});
John.save();

How to get featured image of a product in woocommerce

I got the solution . I tried this .

<?php $image = wp_get_attachment_image_src( get_post_thumbnail_id( $loop->post->ID ), 'single-post-thumbnail' );?>

    <img src="<?php  echo $image[0]; ?>" data-id="<?php echo $loop->post->ID; ?>">

Android:java.lang.OutOfMemoryError: Failed to allocate a 23970828 byte allocation with 2097152 free bytes and 2MB until OOM

If uploading an image, try reducing the image quality, which is the second parameter of the Bitmap. This was the solution in my case. Previously it was 90, then I tried with 60 (as it is in the code below now).

Bitmap yourSelectedImage = BitmapFactory.decodeStream(imageStream);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
finalBitmap.compress(Bitmap.CompressFormat.JPEG,60,baos);
byte[] b = baos.toByteArray();

Android: Unable to add window. Permission denied for this window type

Firstly you make sure you have add permission in manifest file.

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>

Check if the application has draw over other apps permission or not? This permission is by default available for API<23. But for API > 23 you have to ask for the permission in runtime.

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && !Settings.canDrawOverlays(this)) {

    Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
            Uri.parse("package:" + getPackageName()));
    startActivityForResult(intent, 1);
}

Use This code:

public class ChatHeadService extends Service {

private WindowManager mWindowManager;
private View mChatHeadView;

WindowManager.LayoutParams params;

public ChatHeadService() {
}

@Override
public IBinder onBind(Intent intent) {
    return null;
}

@Override
public void onCreate() {
    super.onCreate();

    Language language = new Language();
    //Inflate the chat head layout we created
    mChatHeadView = LayoutInflater.from(this).inflate(R.layout.dialog_incoming_call, null);


    if (Build.VERSION.SDK_INT < Build.VERSION_CODES.O) {
        params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.TYPE_PHONE,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                        | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                        | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
                        | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
                PixelFormat.TRANSLUCENT);

        params.gravity = Gravity.CENTER_HORIZONTAL | Gravity.TOP;
        params.x = 0;
        params.y = 100;
        mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        mWindowManager.addView(mChatHeadView, params);

    } else {
        params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                        | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                        | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
                        | WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
                PixelFormat.TRANSLUCENT);


        params.gravity = Gravity.CENTER_HORIZONTAL | Gravity.TOP;
        params.x = 0;
        params.y = 100;
        mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        mWindowManager.addView(mChatHeadView, params);
    }

    TextView tvTitle=mChatHeadView.findViewById(R.id.tvTitle);
    tvTitle.setText("Incoming Call");

    //Set the close button.
    Button btnReject = (Button) mChatHeadView.findViewById(R.id.btnReject);
    btnReject.setText(language.getText(R.string.reject));
    btnReject.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //close the service and remove the chat head from the window
            stopSelf();
        }
    });

    //Drag and move chat head using user's touch action.
    final Button btnAccept = (Button) mChatHeadView.findViewById(R.id.btnAccept);
    btnAccept.setText(language.getText(R.string.accept));


    LinearLayout linearLayoutMain=mChatHeadView.findViewById(R.id.linearLayoutMain);



    linearLayoutMain.setOnTouchListener(new View.OnTouchListener() {
        private int lastAction;
        private int initialX;
        private int initialY;
        private float initialTouchX;
        private float initialTouchY;

        @Override
        public boolean onTouch(View v, MotionEvent event) {
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:

                    //remember the initial position.
                    initialX = params.x;
                    initialY = params.y;

                    //get the touch location
                    initialTouchX = event.getRawX();
                    initialTouchY = event.getRawY();

                    lastAction = event.getAction();
                    return true;
                case MotionEvent.ACTION_UP:
                    //As we implemented on touch listener with ACTION_MOVE,
                    //we have to check if the previous action was ACTION_DOWN
                    //to identify if the user clicked the view or not.
                    if (lastAction == MotionEvent.ACTION_DOWN) {
                        //Open the chat conversation click.
                        Intent intent = new Intent(ChatHeadService.this, HomeActivity.class);
                        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        startActivity(intent);

                        //close the service and remove the chat heads
                        stopSelf();
                    }
                    lastAction = event.getAction();
                    return true;
                case MotionEvent.ACTION_MOVE:
                    //Calculate the X and Y coordinates of the view.
                    params.x = initialX + (int) (event.getRawX() - initialTouchX);
                    params.y = initialY + (int) (event.getRawY() - initialTouchY);

                    //Update the layout with new X & Y coordinate
                    mWindowManager.updateViewLayout(mChatHeadView, params);
                    lastAction = event.getAction();
                    return true;
            }
            return false;
        }
    });
}

@Override
public void onDestroy() {
    super.onDestroy();
    if (mChatHeadView != null) mWindowManager.removeView(mChatHeadView);
}

}

What does "Fatal error: Unexpectedly found nil while unwrapping an Optional value" mean?

I came across this error while making a segue from a table view controller to a view controller because I had forgotten to specify the custom class name for the view controller in the main storyboard.

Something simple that is worth checking if all else looks ok

Load More Posts Ajax Button in WordPress

If I'm not using any category then how can I use this code? Actually, I want to use this code for custom post type.

How to create dynamic href in react render function?

In addition to Felix's answer,

href={`/posts/${posts.id}`}

would work well too. This is nice because it's all in one string.

Create a simple 10 second countdown

_x000D_

var seconds_inputs =  document.getElementsByClassName('deal_left_seconds');
    var total_timers = seconds_inputs.length;
    for ( var i = 0; i < total_timers; i++){
        var str_seconds = 'seconds_'; var str_seconds_prod_id = 'seconds_prod_id_';
        var seconds_prod_id = seconds_inputs[i].getAttribute('data-value');
        var cal_seconds = seconds_inputs[i].getAttribute('value');

        eval('var ' + str_seconds + seconds_prod_id + '= ' + cal_seconds + ';');
        eval('var ' + str_seconds_prod_id + seconds_prod_id + '= ' + seconds_prod_id + ';');
    }
    function timer() {
        for ( var i = 0; i < total_timers; i++) {
            var seconds_prod_id = seconds_inputs[i].getAttribute('data-value');

            var days = Math.floor(eval('seconds_'+seconds_prod_id) / 24 / 60 / 60);
            var hoursLeft = Math.floor((eval('seconds_'+seconds_prod_id)) - (days * 86400));
            var hours = Math.floor(hoursLeft / 3600);
            var minutesLeft = Math.floor((hoursLeft) - (hours * 3600));
            var minutes = Math.floor(minutesLeft / 60);
            var remainingSeconds = eval('seconds_'+seconds_prod_id) % 60;

            function pad(n) {
                return (n < 10 ? "0" + n : n);
            }
            document.getElementById('deal_days_' + seconds_prod_id).innerHTML = pad(days);
            document.getElementById('deal_hrs_' + seconds_prod_id).innerHTML = pad(hours);
            document.getElementById('deal_min_' + seconds_prod_id).innerHTML = pad(minutes);
            document.getElementById('deal_sec_' + seconds_prod_id).innerHTML = pad(remainingSeconds);

            if (eval('seconds_'+ seconds_prod_id) == 0) {
                clearInterval(countdownTimer);
                document.getElementById('deal_days_' + seconds_prod_id).innerHTML = document.getElementById('deal_hrs_' + seconds_prod_id).innerHTML = document.getElementById('deal_min_' + seconds_prod_id).innerHTML = document.getElementById('deal_sec_' + seconds_prod_id).innerHTML = pad(0);
            } else {
                var value = eval('seconds_'+seconds_prod_id);
                value--;
                eval('seconds_' + seconds_prod_id + '= ' + value + ';');
            }
        }
    }

    var countdownTimer = setInterval('timer()', 1000);

_x000D_

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<input type="hidden" class="deal_left_seconds" data-value="1" value="10">
<div class="box-wrapper">
    <div class="date box"> <span class="key" id="deal_days_1">00</span> <span class="value">DAYS</span> </div>
</div>
<div class="box-wrapper">
    <div class="hour box"> <span class="key" id="deal_hrs_1">00</span> <span class="value">HRS</span> </div>
</div>
<div class="box-wrapper">
    <div class="minutes box"> <span class="key" id="deal_min_1">00</span> <span class="value">MINS</span> </div>
</div>
<div class="box-wrapper hidden-md">
    <div class="seconds box"> <span class="key" id="deal_sec_1">0p0</span> <span class="value">SEC</span> </div>
</div>

_x000D_

FloatingActionButton example with Support Library

So in your build.gradle file, add this:

compile 'com.android.support:design:27.1.1'

AndroidX Note: Google is introducing new AndroidX extension libraries to replace the older Support Libraries. To use AndroidX, first make sure you've updated your gradle.properties file, edited build.gradle to set compileSdkVersion to 28 (or higher), and use the following line instead of the previous compile one.

implementation 'com.google.android.material:material:1.0.0'

Next, in your themes.xml or styles.xml or whatever, make sure you set this- it's your app's accent color-- and the color of your FAB unless you override it (see below):

        <item name="colorAccent">@color/floating_action_button_color</item>

In the layout's XML:

<RelativeLayout
 ...
 xmlns:app="http://schemas.android.com/apk/res-auto">

       <android.support.design.widget.FloatingActionButton
            android:id="@+id/myFAB"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_plus_sign"
            app:elevation="4dp"
            ... />

</RelativeLayout>

Or if you are using the AndroidX material library above, you'd instead use this:

<RelativeLayout
 ...
 xmlns:app="http://schemas.android.com/apk/res-auto">

       <com.google.android.material.floatingactionbutton.FloatingActionButton
            android:id="@+id/myFAB"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:srcCompat="@drawable/ic_plus_sign"
            app:elevation="4dp"
            ... />

</RelativeLayout>

You can see more options in the docs (material docs here) (setRippleColor, etc.), but one of note is:

    app:fabSize="mini"

Another interesting one-- to change the background color of just one FAB, add:

    app:backgroundTint="#FF0000"

(for example to change it to red) to the XML above.

Anyway, in code, after the Activity/Fragment's view is inflated....

    FloatingActionButton myFab = (FloatingActionButton)  myView.findViewById(R.id.myFAB);
    myFab.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            doMyThing();
        }
    });

Observations:

If you have one of those buttons that's on a "seam" splitting two views (using a RelativeLayout, for example) with, say, a negative bottom layout margin to overlap the border, you'll notice an issue: the FAB's size is actually very different on lollipop vs. pre-lollipop. You can actually see this in AS's visual layout editor when you flip between APIs-- it suddenly "puffs out" when you switch to pre-lollipop. The reason for the extra size seems to be that the shadow expands the size of the view in every direction. So you have to account for this when you're adjusting the FAB's margins if it's close to other stuff.

Here's a way to remove or change the padding if there's too much:

if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP) {
    RelativeLayout.LayoutParams p = (RelativeLayout.LayoutParams) myFab.getLayoutParams();
    p.setMargins(0, 0, 0, 0); // get rid of margins since shadow area is now the margin
    myFab.setLayoutParams(p);
}

Also, I was going to programmatically place the FAB on the "seam" between two areas in a RelativeLayout by grabbing the FAB's height, dividing by two, and using that as the margin offset. But myFab.getHeight() returned zero, even after the view was inflated, it seemed. Instead I used a ViewTreeObserver to get the height only after it's laid out and then set the position. See this tip here. It looked like this:

    ViewTreeObserver viewTreeObserver = closeButton.getViewTreeObserver();
    if (viewTreeObserver.isAlive()) {
        viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
                    closeButton.getViewTreeObserver().removeGlobalOnLayoutListener(this);
                } else {
                    closeButton.getViewTreeObserver().removeOnGlobalLayoutListener(this);
                }
                // not sure the above is equivalent, but that's beside the point for this example...
                RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) closeButton.getLayoutParams();
                params.setMargins(0, 0, 16, -closeButton.getHeight() / 2); // (int left, int top, int right, int bottom)
                closeButton.setLayoutParams(params);
            }
        });
    }

Not sure if this is the right way to do it, but it seems to work.

It seems you can make the shadow-space of the button smaller by decreasing the elevation.

If you want the FAB on a "seam" you can use layout_anchor and layout_anchorGravity here is an example:

<android.support.design.widget.FloatingActionButton
    android:layout_height="wrap_content"
    android:layout_width="wrap_content"
    app:layout_anchor="@id/appbar"
    app:layout_anchorGravity="bottom|right|end"
    android:src="@drawable/ic_discuss"
    android:layout_margin="@dimen/fab_margin"
    android:clickable="true"/>

Remember that you can automatically have the button jump out of the way when a Snackbar comes up by wrapping it in a CoordinatorLayout.

Google's Design Support Library Page
the FloatingActionButton docs
"Material Now" talk from Google I/O 2015 - Support Design Library introduced at 17m22s
Design Support Library sample/showcase

Using an authorization header with Fetch in React Native

I had this identical problem, I was using django-rest-knox for authentication tokens. It turns out that nothing was wrong with my fetch method which looked like this:

...
    let headers = {"Content-Type": "application/json"};
    if (token) {
      headers["Authorization"] = `Token ${token}`;
    }
    return fetch("/api/instruments/", {headers,})
      .then(res => {
...

I was running apache.

What solved this problem for me was changing WSGIPassAuthorization to 'On' in wsgi.conf.

I had a Django app deployed on AWS EC2, and I used Elastic Beanstalk to manage my application, so in the django.config, I did this:

container_commands:
  01wsgipass:
    command: 'echo "WSGIPassAuthorization On" >> ../wsgi.conf'

Android statusbar icons color

Yes you can change it. but in api 22 and above, using NotificationCompat.Builder and setColorized(true) :

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context, context.getPackageName())
                .setContentTitle(title)
                .setContentText(message)
                .setSmallIcon(icon, level)
                .setLargeIcon(largeIcon)
                .setContentIntent(intent)
                .setColorized(true)
                .setDefaults(0)
                .setCategory(Notification.CATEGORY_SERVICE)
                .setVisibility(NotificationCompat.VISIBILITY_PUBLIC)
                .setPriority(NotificationCompat.PRIORITY_HIGH);

Windows equivalent of 'touch' (i.e. the node.js way to create an index.html)

Easy, example with txt file

echo $null >> filename.txt

cURL error 60: SSL certificate: unable to get local issuer certificate

when I run 'var_dump(php_ini_loaded_file());' I get this output on my page 'C:\Development\bin\apache\apache2.4.33\bin\php.ini' (length=50)'

and to get php to load my cert file I had to edit the php.ini in this path 'C:\Development\bin\apache\apache2.4.33\bin\php.ini' and add openssl.cafile="C:/Development/bin/php/php7.2.4/extras/ssl/cacert.pem" where I had downloaded and place my cert file from https://curl.haxx.se/docs/caextract.html

am on windows 10, using drupal 8, wamp and php7.2.4

Hide keyboard in react-native

in ScrollView use

keyboardShouldPersistTaps="handled"

This will do your job.

Remove duplicates from a list of objects based on property in Java 8

You can get a stream from the List and put in in the TreeSet from which you provide a custom comparator that compares id uniquely.

Then if you really need a list you can put then back this collection into an ArrayList.

import static java.util.Comparator.comparingInt;
import static java.util.stream.Collectors.collectingAndThen;
import static java.util.stream.Collectors.toCollection;

...
List<Employee> unique = employee.stream()
                                .collect(collectingAndThen(toCollection(() -> new TreeSet<>(comparingInt(Employee::getId))),
                                                           ArrayList::new));

Given the example:

List<Employee> employee = Arrays.asList(new Employee(1, "John"), new Employee(1, "Bob"), new Employee(2, "Alice"));

It will output:

[Employee{id=1, name='John'}, Employee{id=2, name='Alice'}]

Another idea could be to use a wrapper that wraps an employee and have the equals and hashcode method based with its id:

class WrapperEmployee {
    private Employee e;

    public WrapperEmployee(Employee e) {
        this.e = e;
    }

    public Employee unwrap() {
        return this.e;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        WrapperEmployee that = (WrapperEmployee) o;
        return Objects.equals(e.getId(), that.e.getId());
    }

    @Override
    public int hashCode() {
        return Objects.hash(e.getId());
    }
}

Then you wrap each instance, call distinct(), unwrap them and collect the result in a list.

List<Employee> unique = employee.stream()
                                .map(WrapperEmployee::new)
                                .distinct()
                                .map(WrapperEmployee::unwrap)
                                .collect(Collectors.toList());

In fact, I think you can make this wrapper generic by providing a function that will do the comparison:

public class Wrapper<T, U> {
    private T t;
    private Function<T, U> equalityFunction;

    public Wrapper(T t, Function<T, U> equalityFunction) {
        this.t = t;
        this.equalityFunction = equalityFunction;
    }

    public T unwrap() {
        return this.t;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        @SuppressWarnings("unchecked")
        Wrapper<T, U> that = (Wrapper<T, U>) o;
        return Objects.equals(equalityFunction.apply(this.t), that.equalityFunction.apply(that.t));
    }

    @Override
    public int hashCode() {
        return Objects.hash(equalityFunction.apply(this.t));
    }
}

and the mapping will be:

.map(e -> new Wrapper<>(e, Employee::getId))

Responsive width Facebook Page Plugin

I refined Twentyfortysix answer a bit, to only trigger the event after the resize is done.

In addition I added check for the width of the window, so it won't trigger the reinitialisation on Android.

(function(d, s, id) {
      var js, fjs = d.getElementsByTagName(s)[0];
      if (d.getElementById(id)) return;
      js = d.createElement(s); js.id = id;
      js.src = "//connect.facebook.net/en_EN/sdk.js#xfbml=1&version=v2.3";
      fjs.parentNode.insertBefore(js, fjs);
    }(document, 'script', 'facebook-jssdk'));

    jQuery(document).ready(function($) {
        var oldwidth = $(window).width();
        var timeout;

        var recalc = function() {
          clearTimeout(timeout);
          timeout = setTimeout(function() {
          var container_width = $('#fbcontainer').width();    
            $('#fbcontainer').html('<div class="fb-page" ' + 
            'data-href="YOUR FACEBOOK PAGE URL"' +
            ' data-width="' + container_width + '" data-height="750" data-adapt-container-width="true" data-hide-cover="false" data-show-facepile="true" data-show-posts="true"><div class="fb-xfbml-parse-ignore"><blockquote cite="YOUR FACEBOOK PAGE URL"><a href="YOUR FACEBOOK PAGE URL">YOUR FACEBOOK PAGE TITLE</a></blockquote></div></div>');
            if(typeof FB !== 'undefined') {
                FB.XFBML.parse( );  
            }  
          }, 100);  
        };

        recalc();

      $(window).bind("resize", function(){  
        if(oldwidth !== $(window).width()) {
            recalc();
            oldwidth = $(window).width();
        }
        }); 
    });

How can I reduce the waiting (ttfb) time

I have met the same problem. My project is running on the local server. I checked my php code.

$db = mysqli_connect('localhost', 'root', 'root', 'smart');

I use localhost to connect to my local database. That maybe the cause of the problem which you're describing. You can modify your HOSTS file. Add the line

127.0.0.1 localhost.

No 'Access-Control-Allow-Origin' header is present on the requested resource error

Try this - set Ajax call by setting up the header as follows:

var uri = "http://localhost:50869/odata/mydatafeeds"
$.ajax({
    url: uri,
    beforeSend: function (request) {
        request.setRequestHeader("Authorization", "Negotiate");
    },
    async: true,
    success: function (data) {
        alert(JSON.stringify(data));
    },
    error: function (xhr, textStatus, errorMessage) {
        alert(errorMessage);
    }                
});

Then run your code by opening Chrome with the following command line:

chrome.exe --user-data-dir="C:/Chrome dev session" --disable-web-security

Laravel - Model Class not found

In your router.php file, you should use the model class like this

 use App\Post;

and use the model class like this.

Route::get('/posts', function() {

        $results = Post::all();
        return $results; });

Windows Scipy Install: No Lapack/Blas Resources Found

Simple and Fast Installation of Scipy in Windows

From http://www.lfd.uci.edu/~gohlke/pythonlibs/#scipy download the correct Scipy package for your Python version (e.g. the correct package for python 3.5 and Windows x64 is scipy-0.19.1-cp35-cp35m-win_amd64.whl).
Open cmd inside the directory containing the downloaded Scipy package.
Type pip install <<your-scipy-package-name>> (e.g. pip install scipy-0.19.1-cp35-cp35m-win_amd64.whl).

How to configure Docker port mapping to use Nginx as an upstream proxy?

Using docker links, you can link the upstream container to the nginx container. An added feature is that docker manages the host file, which means you'll be able to refer to the linked container using a name rather than the potentially random ip.

C compile : collect2: error: ld returned 1 exit status

This issue appears when you have a running console at the time you try to run other (or the same) program.

I had this problem during executing a program on Sublime Text while I had another one running on DevC++ already.

TypeError: Router.use() requires middleware function but got a Object

If your are using express above 2.x, you have to declare app.router like below code. Please try to replace your code

app.use('/', routes);

with

app.use(app.router);
routes.initialize(app);

Please click here to get more details about app.router

Note:

app.router is depreciated in express 3.0+. If you are using express 3.0+, refer to Anirudh's answer below.

App crashing when trying to use RecyclerView on android 5.0

If I where you I will do this. onView(withId(android.R.id.list)).perform(RecyclerViewActions.scrollToPosition(3)); android.R.id.list change it to your list id and position will be your position inside your array.

Adding a view controller as a subview in another view controller

Thanks to Rob. Adding detailed syntax for your second observation :

let controller:MyView = self.storyboard!.instantiateViewControllerWithIdentifier("MyView") as! MyView
controller.ANYPROPERTY=THEVALUE // If you want to pass value
controller.view.frame = self.view.bounds
self.view.addSubview(controller.view)
self.addChildViewController(controller)
controller.didMoveToParentViewController(self)

And to remove the viewcontroller :

self.willMoveToParentViewController(nil)
self.view.removeFromSuperview()
self.removeFromParentViewController()

Efficiently getting all divisors of a given number

Here is the Java Implementation of this approach:

public static int countAllFactors(int num)
{
    TreeSet<Integer> tree_set = new TreeSet<Integer>();
    for (int i = 1; i * i <= num; i+=1)
    {
        if (num % i == 0)
        {
            tree_set.add(i);
            tree_set.add(num / i);
        }
    }
    System.out.print(tree_set);
    return tree_set.size();
}

Android Studio SDK location

Start Android Studio and select Configure --> SDK Manager

Then, check the path of Android SDK

If you can't find the SDK location, you may want to download it. Just scroll down to near end of the download page and select the Android SDK with respect to your OS.

Stupid error: Failed to load resource: net::ERR_CACHE_MISS

I solved this error with clearing cache and restarting chrome. Hope they will fix it in ver 40.

Abort trap 6 error in C

You are writing to memory you do not own:

int board[2][50]; //make an array with 3 columns  (wrong)
                  //(actually makes an array with only two 'columns')
...
for (i=0; i<num3+1; i++)
    board[2][i] = 'O';
          ^

Change this line:

int board[2][50]; //array with 2 columns (legal indices [0-1][0-49])
          ^

To:

int board[3][50]; //array with 3 columns (legal indices [0-2][0-49])
          ^

When creating an array, the value used to initialize: [3] indicates array size.
However, when accessing existing array elements, index values are zero based.

For an array created: int board[3][50];
Legal indices are board[0][0]...board[2][49]

EDIT To address bad output comment and initialization comment

add an additional "\n" for formatting output:

Change:

  ...
  for (k=0; k<50;k++) {
     printf("%d",board[j][k]);
  }
 }

       ...

To:

  ...
  for (k=0; k<50;k++) {
     printf("%d",board[j][k]);
  }
  printf("\n");//at the end of every row, print a new line
}
...

Initialize board variable:

int board[3][50] = {0};//initialize all elements to zero

( array initialization discussion... )

How to convert entire dataframe to numeric while preserving decimals?

Using dplyr (a bit like sapply..)

df2 <- mutate_all(df1, function(x) as.numeric(as.character(x)))

which gives:

glimpse(df2)
Observations: 4
Variables: 2
$ a <dbl> 0.01, 0.02, 0.03, 0.04
$ b <dbl> 2, 4, 5, 7

from your df1 which was:

glimpse(df1)
Observations: 4
Variables: 2
$ a <fctr> 0.01, 0.02, 0.03, 0.04
$ b <dbl> 2, 4, 5, 7

How to modify WooCommerce cart, checkout pages (main theme portion)

You can use the is_cart() conditional tag:

if (! is_cart() ) {
  // Do something.
}

SQL Network Interfaces, error: 50 - Local Database Runtime error occurred. Cannot create an automatic instance

In my case, we had several projects in one solution and had selected a different start project than in the package manager console when running the "Update-Database" Command with Code-First Migrations. Make sure to select the proper start project.

How can I avoid getting this MySQL error Incorrect column specifier for column COLUMN NAME?

I was having the same problem, but using Long type. I changed for INT and it worked for me.

CREATE TABLE lists (
 id INT NOT NULL AUTO_INCREMENT,
 desc varchar(30),
 owner varchar(20),
 visibility boolean,
 PRIMARY KEY (id)
 );

Error: TypeError: $(...).dialog is not a function

I just experienced this with the line:

$('<div id="editor" />').dialogelfinder({

I got the error "dialogelfinder is not a function" because another component was inserting a call to load an older version of JQuery (1.7.2) after the newer version was loaded.

As soon as I commented out the second load, the error went away.

How to show Bootstrap table with sort icon

You could try using FontAwesome. It contains a sort-icon (http://fontawesome.io/icon/sort/).

To do so, you would

need to include fontawesome:

<link href="//maxcdn.bootstrapcdn.com/font-awesome/4.1.0/css/font-awesome.min.css" rel="stylesheet">

and then simply use the fontawesome-icon instead of the default-bootstrap-icons in your th's:
```
<th><b>#</b> <i class="fa fa-fw fa-sort"></i></th>
```

Hope that helps.

Check if key exists and iterate the JSON array using Python

jsonData = """{"from": {"id": "8", "name": "Mary Pinter"}, "message": "How ARE you?", "comments": {"count": 0}, "updated_time": "2012-05-01", "created_time": "2012-05-01", "to": {"data": [{"id": "1543", "name": "Honey Pinter"}, {"name": "Joe Schmoe"}]}, "type": "status", "id": "id_7"}"""

def getTargetIds(jsonData):
    data = json.loads(jsonData)
    for dest in data['to']['data']:
        print("to_id:", dest.get('id', 'null'))

Try it:

>>> getTargetIds(jsonData)
to_id: 1543
to_id: null

Or, if you just want to skip over values missing ids instead of printing 'null':

def getTargetIds(jsonData):
    data = json.loads(jsonData)
    for dest in data['to']['data']:
        if 'id' in to_id:
            print("to_id:", dest['id'])

So:

>>> getTargetIds(jsonData)
to_id: 1543

Of course in real life, you probably don't want to print each id, but to store them and do something with them, but that's another issue.

How to print to console in pytest?

By default, py.test captures the result of standard out so that it can control how it prints it out. If it didn't do this, it would spew out a lot of text without the context of what test printed that text.

However, if a test fails, it will include a section in the resulting report that shows what was printed to standard out in that particular test.

For example,

def test_good():
    for i in range(1000):
        print(i)

def test_bad():
    print('this should fail!')
    assert False

Results in the following output:

>>> py.test tmp.py
============================= test session starts ==============================
platform darwin -- Python 2.7.6 -- py-1.4.20 -- pytest-2.5.2
plugins: cache, cov, pep8, xdist
collected 2 items

tmp.py .F

=================================== FAILURES ===================================
___________________________________ test_bad ___________________________________

    def test_bad():
        print('this should fail!')
>       assert False
E       assert False

tmp.py:7: AssertionError
------------------------------- Captured stdout --------------------------------
this should fail!
====================== 1 failed, 1 passed in 0.04 seconds ======================

Note the Captured stdout section.

If you would like to see print statements as they are executed, you can pass the -s flag to py.test. However, note that this can sometimes be difficult to parse.

>>> py.test tmp.py -s
============================= test session starts ==============================
platform darwin -- Python 2.7.6 -- py-1.4.20 -- pytest-2.5.2
plugins: cache, cov, pep8, xdist
collected 2 items

tmp.py 0
1
2
3
... and so on ...
997
998
999
.this should fail!
F

=================================== FAILURES ===================================
___________________________________ test_bad ___________________________________

    def test_bad():
        print('this should fail!')
>       assert False
E       assert False

tmp.py:7: AssertionError
====================== 1 failed, 1 passed in 0.02 seconds ======================

Java Error: illegal start of expression

public static int [] locations={1,2,3};

public static test dot=new test();

Declare the above variables above the main method and the code compiles fine.

public static void main(String[] args){

req.body empty on posts

My problem was creating the route first require("./routes/routes")(app); I shifted it to the end of the code before app.listen and it worked!

How to change default format at created_at and updated_at value laravel

You can also try like this.

Use Carbon\Carbon;


$created_at = "2014-06-26 04:07:31";

$date = Carbon::parse($created_at);

echo $date->format("Y-m-d");

How to install Java 8 on Mac

As of May 3, 2020, this site has a download link for jre8u251: https://java.com/en/download/mac_download.jsp

MySQL Select last 7 days

Since you are using an INNER JOIN you can just put the conditions in the WHERE clause, like this:

SELECT 
    p1.kArtikel, 
    p1.cName, 
    p1.cKurzBeschreibung, 
    p1.dLetzteAktualisierung, 
    p1.dErstellt, 
    p1.cSeo,
    p2.kartikelpict,
    p2.nNr,
    p2.cPfad  
FROM 
    tartikel AS p1 INNER JOIN tartikelpict AS p2 
    ON p1.kArtikel = p2.kArtikel
WHERE
  DATE(dErstellt) > (NOW() - INTERVAL 7 DAY)
  AND p2.nNr = 1
ORDER BY 
  p1.kArtikel DESC
LIMIT
    100;

Display A Popup Only Once Per User

You can use removeItem() class of localStorage to destroy that key on browser close with:

window.onbeforeunload = function{
    localStorage.removeItem('your key');
};

How to enable local network users to access my WAMP sites?

Put your wamp server online

and then go to control panel > system and security > windows firewall and turn windows firewall off

now you can access your wamp server from another computer over local network by the network IP of computer which have wamp server installed like http://192.168.2.34/mysite

Use HTML5 to resize an image before upload

If some of you, like me, encounter orientation problems I have combined the solutions here with a exif orientation fix

https://gist.github.com/SagiMedina/f00a57de4e211456225d3114fd10b0d0

filter items in a python dictionary where keys contain a specific string

Jonathon gave you an approach using dict comprehensions in his answer. Here is an approach that deals with your do something part.

If you want to do something with the values of the dictionary, you don't need a dictionary comprehension at all:

I'm using iteritems() since you tagged your question with python-2.7

results = map(some_function, [(k,v) for k,v in a_dict.iteritems() if 'foo' in k])

Now the result will be in a list with some_function applied to each key/value pair of the dictionary, that has foo in its key.

If you just want to deal with the values and ignore the keys, just change the list comprehension:

results = map(some_function, [v for k,v in a_dict.iteritems() if 'foo' in k])

some_function can be any callable, so a lambda would work as well:

results = map(lambda x: x*2, [v for k,v in a_dict.iteritems() if 'foo' in k])

The inner list is actually not required, as you can pass a generator expression to map as well:

>>> map(lambda a: a[0]*a[1], ((k,v) for k,v in {2:2, 3:2}.iteritems() if k == 2))
[4]

How to disable SSL certificate checking with Spring RestTemplate?

Disabling certificate checking is the wrong solution, and radically insecure.

The correct solution is to import the self-signed certificate into your truststore. An even more correct solution is to get the certificate signed by a CA.

If this is 'only for testing' it is still necessary to test the production configuration. Testing something else isn't a test at all, it's just a waste of time.

Cannot access mongodb through browser - It looks like you are trying to access MongoDB over HTTP on the native driver port

Before Mongo 3.6:

You may start mongodb with

mongod --httpinterface

And access it on

http://localhost:28017

Since version 2.6: MongoDB disables the HTTP interface by default.

Update

HTTP Interface and REST API

MongoDB 3.6 removes the deprecated HTTP interface and REST API to MongoDB.

See Mongo http interface and rest api

How to resolve the "ADB server didn't ACK" error?

Try the following:

Close Eclipse.
Restart your phone.
End adb.exe process in Task Manager (Windows). In Mac, force close in Activity Monitor.
Issue kill and start command in \platform-tools\
- C:\sdk\platform-tools>adb kill-server
- C:\sdk\platform-tools>adb start-server
If it says something like 'started successfully', you are good.

importing pyspark in python shell

I had this same problem and would add one thing to the proposed solutions above. When using Homebrew on Mac OS X to install Spark you will need to correct the py4j path address to include libexec in the path (remembering to change py4j version to the one you have);

PYTHONPATH=$SPARK_HOME/libexec/python/lib/py4j-0.9-src.zip:$PYTHONPATH

npm install private github repositories by dependency in package.json

Try this:

"dependencies" : {
  "name1" : "git://github.com/user/project.git#commit-ish",
  "name2" : "git://github.com/user/project.git#commit-ish"
}

You could also try this, where visionmedia/express is name/repo:

"dependencies" : {
   "express" : "visionmedia/express"
}

Or (if the npm package module exists):

"dependencies" : {
  "name": "*"
}

Taken from NPM docs

Call asynchronous method in constructor?

You could try AsyncMVVM.

Page2.xaml:

<PhoneApplicationPage x:Class="Page2"
                      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
    <ListView ItemsSource="{Binding Writings}" />
</PhoneApplicationPage>

Page2.xaml.cs:

public partial class Page2
{
    InitializeComponent();
    DataContext = new ViewModel2();
}

ViewModel2.cs:

public class ViewModel2: AsyncBindableBase
{
    public IEnumerable<Writing> Writings
    {
        get { return Property.Get(GetWritingsAsync); }
    }

    private async Task<IEnumerable<Writing>> GetWritingsAsync()
    {
        string jsonData = await JsonDataManager.GetJsonAsync("1");
        JObject obj = JObject.Parse(jsonData);
        JArray array = (JArray)obj["posts"];

        for (int i = 0; i < array.Count; i++)
        {
            Writing writing = new Writing();
            writing.content = JsonDataManager.JsonParse(array, i, "content");
            writing.date = JsonDataManager.JsonParse(array, i, "date");
            writing.image = JsonDataManager.JsonParse(array, i, "url");
            writing.summary = JsonDataManager.JsonParse(array, i, "excerpt");
            writing.title = JsonDataManager.JsonParse(array, i, "title");
            yield return writing;
        }
    }
}

Laravel use same form for create and edit

In Rails, it has form_for helper, so we could make a function like form_for.

We can make a Form macro, for example in resource/macro/html.php:

(if you don't know how to setup a macro, you can google "laravel 5 Macro")

Form::macro('start', function($record, $resource, $options = array()){
    if ((null === $record || !$record->exists()) ? 1 : 0) {
        $options['route'] = $resource .'.store';
        $options['method'] = 'POST';
        $str = Form::open($options);
    } else {
        $options['route'] = [$resource .'.update', $record->id];
        $options['method'] = 'PUT';
        $str = Form::model($record, $options);
    }
    return $str;
});

The Controller:

public function create()
{
    $category = null;
    return view('admin.category.create', compact('category'));
}

public function edit($id)
{
    $category = Category.find($id);
    return view('admin.category.edit', compact('category'));
}

Then in the view _form.blade.php:

{!! Form::start($category, 'admin.categories', ['class' => 'definewidth m20']) !!}
// here the Form fields
{{!! Form::close() !!}}

Then view create.blade.php:

@include '_form'

Then view edit.blade.php:

@include '_form'

web-api POST body object always null

I spend several hours with this issue... :( Getters and setters are REQUIRED in POST parameters object declaration. I do not recommend using simple data objects (string,int, ...) as they require special request format.

[HttpPost]
public HttpResponseMessage PostProcedure(EdiconLogFilter filter){
...
}

Does not work when:

public class EdiconLogFilter
{
    public string fClientName;
    public string fUserName;
    public string fMinutes;
    public string fLogDate;
}

Works fine when:

public class EdiconLogFilter
{
    public string fClientName { get; set; }
    public string fUserName { get; set; }
    public string fMinutes { get; set; }
    public string fLogDate { get; set; }
}

How are people unit testing with Entity Framework 6, should you bother?

There is Effort which is an in memory entity framework database provider. I've not actually tried it... Haa just spotted this was mentioned in the question!

Alternatively you could switch to EntityFrameworkCore which has an in memory database provider built-in.

https://blog.goyello.com/2016/07/14/save-time-mocking-use-your-real-entity-framework-dbcontext-in-unit-tests/

https://github.com/tamasflamich/effort

I used a factory to get a context, so i can create the context close to its use. This seems to work locally in visual studio but not on my TeamCity build server, not sure why yet.

return new MyContext(@"Server=(localdb)\mssqllocaldb;Database=EFProviders.InMemory;Trusted_Connection=True;");

Sublime Text 3, convert spaces to tabs

As you might already know, you can customize your indention settings in Preferences.sublime-settings, for example:

"detect_indentation": true,
"tab_size": 4,
"translate_tabs_to_spaces": false

This will set your editor to use tabs that are 4 spaces wide and will override the default behavior that causes Sublime to match the indention of whatever file you're editing. With these settings, re-indenting the file will cause any spaces to be replaced with tabs.

As far as automatically re-indenting when opening a file, that's not quite as easy (but probably isn't a great idea since whitespace changes wreak havoc on file diffs). What might be a better course of action: you can map a shortcut for re-indention and just trigger that when you open a new file that needs fixing.

How to prevent 'query timeout expired'? (SQLNCLI11 error '80040e31')

Turns out that the post (or rather the whole table) was locked by the very same connection that I tried to update the post with.

I had a opened record set of the post that was created by:

Set RecSet = Conn.Execute()

This type of recordset is supposed to be read-only and when I was using MS Access as database it did not lock anything. But apparently this type of record set did lock something on MS SQL Server 2012 because when I added these lines of code before executing the UPDATE SQL statement...

RecSet.Close
Set RecSet = Nothing

...everything worked just fine.

So bottom line is to be careful with opened record sets - even if they are read-only they could lock your table from updates.

Laravel Soft Delete posts

In the Latest version of Laravel i.e above Laravel 5.0. It is quite simple to perform this task. In Model, inside the class just write 'use SoftDeletes'. Example

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;

class User extends Model
{
    use SoftDeletes;
}

And In Controller, you can do deletion. Example

User::where('email', '[email protected]')->delete();

User::where('email', '[email protected]')->softDeletes();

Make sure that you must have 'deleted_at' column in the users Table.

The model backing the 'ApplicationDbContext' context has changed since the database was created

this comes because you add some property to one of your model and you did not update-Database . to solve this you have to remove it from model or you have to add-migration anyProperName with that properties and Update-database.

Bootstrap Dropdown menu is not working

I faced this while I was using ASP .NET Forms. The solution I used was deleting or commenting out jQuery and Bootstrap references from the <asp:ScriptManager runat="server"> in the master page. It seems it creates a conflict with the jQuery and Bootstrap references that you put in the <header>.

Check if two lists are equal

Use SequenceEqual to check for sequence equality because Equals method checks for reference equality.

var a = ints1.SequenceEqual(ints2);

Or if you don't care about elements order use Enumerable.All method:

var a = ints1.All(ints2.Contains);

The second version also requires another check for Count because it would return true even if ints2 contains more elements than ints1. So the more correct version would be something like this:

var a = ints1.All(ints2.Contains) && ints1.Count == ints2.Count;

In order to check inequality just reverse the result of All method:

var a = !ints1.All(ints2.Contains)

Wait until ActiveWorkbook.RefreshAll finishes - VBA

I tried a couple of those suggestions above, the best solution for me was to disable backgroundquery for each connection.

With ActiveWorkbook.Connections("Query - DL_3").OLEDBConnection
    .BackgroundQuery = False
    End With

Failed to install Python Cryptography package with PIP and setup.py

In case that you are dockerizing your python application, your Dockerfile needs to have something like:

FROM python:3.7-alpine

RUN apk add --update alpine-sdk && apk add libffi-dev openssl-dev

RUN pip install cryptography

Disable mouse scroll wheel zoom on embedded Google Maps

The simplest way to do it is by using a pseudo-element like :before or :after.
This method will not require any additional html elements or jquery.
If we have for instance this html structure:

<div class="map_wraper">

    <iframe src="https://www.google.com/maps/embed?pb=!1m18!1m12!1m3!1d405689.7826944034!2d-122.04109805!3d37.40280355!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x808fb68ad0cfc739%3A0x7eb356b66bd4b50e!2sSilicon+Valley%2C+CA!5e0!3m2!1sen!2sro!4v1438864791455" width="600" height="450" frameborder="0" style="border:0" allowfullscreen></iframe>

</div>

Then all we need to do is make the wrapper relative to the pseudo-element we will create to prevent the scrolling

.map_wraper{
    position:relative;
}

After this we will create the pseudo-element that will be positioned over the map therefor preventing the scrolling:

.map_wraper:after{
    background: none;
    content: " ";
    display: inline-block;
    font-size: 0;
    height: 100%;
    left: 0;
    opacity: 0;
    position: absolute;
    top: 0;
    width: 100%;
    z-index: 9;
}

And you're done, no jquery no extra html elements! Here is a working jsfiddle example: http://jsfiddle.net/e6j4Lbe1/

Select all from table with Laravel and Eloquent

go to your Controller write this in function

public function index()
{
  $posts = \App\Post::all();

  return view('yourview', ['posts' => $posts]);
}

in view to show it

@foreach($posts as $post)
  {{ $post->yourColumnName }}
@endforeach

'Invalid update: invalid number of rows in section 0

You need to remove the object from your data array before you call deleteRowsAtIndexPaths:withRowAnimation:. So, your code should look like this:

// Editing of rows is enabled
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {

        //when delete is tapped
        [currentCart removeObjectAtIndex:indexPath.row];

        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }
}

You can also simplify your code a little by using the array creation shortcut @[]:

[tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];

jquery ajax function not working

Give this a go:

<form name="postcontent" id="postcontent">
    <input name="postsubmit" type="submit" id="postsubmit" value="POST"/>
    <textarea id="postdata" name="postdata" placeholder="What's Up ?"></textarea>
</form>
<script>
    (function() {
        $("#postcontent").on('submit', function(e) {
            e.preventDefault();
        $.ajax({
            type:"POST",
            url:"add_new_post.php",
            data:$("#postcontent").serialize(),
            beforeSend:function(){
                $(".post_submitting").show().html("<center><img src='images/loading.gif'/></center>");
            },success:function(response){   
                //alert(response);
                $("#return_update_msg").html(response); 
                $(".post_submitting").fadeOut(1000);                
            }
        });
   });
})();
</script>

TypeError: got multiple values for argument

This happens when a keyword argument is specified that overwrites a positional argument. For example, let's imagine a function that draws a colored box. The function selects the color to be used and delegates the drawing of the box to another function, relaying all extra arguments.

def color_box(color, *args, **kwargs):
    painter.select_color(color)
    painter.draw_box(*args, **kwargs)

Then the call

color_box("blellow", color="green", height=20, width=30)

will fail because two values are assigned to color: "blellow" as positional and "green" as keyword. (painter.draw_box is supposed to accept the height and width arguments).

This is easy to see in the example, but of course if one mixes up the arguments at call, it may not be easy to debug:

# misplaced height and width
color_box(20, 30, color="green")

Here, color is assigned 20, then args=[30] and color is again assigned "green".

How to create JSON post to api using C#

Have you tried using the WebClient class?

you should be able to use

string result = "";
using (var client = new WebClient())
{
    client.Headers[HttpRequestHeader.ContentType] = "application/json"; 
    result = client.UploadString(url, "POST", json);
}
Console.WriteLine(result);

Documentation at

http://msdn.microsoft.com/en-us/library/system.net.webclient%28v=vs.110%29.aspx

http://msdn.microsoft.com/en-us/library/d0d3595k%28v=vs.110%29.aspx

ERROR 1044 (42000): Access denied for 'root' With All Privileges

If you get an error 1044 (42000) when you try to run SQL commands in MySQL (which installed along XAMPP server) cmd prompt, then here's the solution:

Close your MySQL command prompt.
Open your cmd prompt (from Start menu -> run -> cmd) which will show: C:\Users\User>_
Go to MySQL.exe by Typing the following commands:

C:\Users\User>cd\ C:\>cd xampp C:\xampp>cd mysql C:\xxampp\mysql>cd bin C:\xampp\mysql\bin>mysql -u root

Now try creating a new database by typing:
```
mysql> create database employee;
```
if it shows:
```
Query OK, 1 row affected (0.00 sec)
mysql>
```
Then congrats ! You are good to go...

How can I use break or continue within for loop in Twig template?

From docs TWIG docs:

Unlike in PHP, it's not possible to break or continue in a loop.

But still:

You can however filter the sequence during iteration which allows you to skip items.

Example 1 (for huge lists you can filter posts using slice, slice(start, length)):

{% for post in posts|slice(0,10) %}
    <h2>{{ post.heading }}</h2>
{% endfor %}

Example 2:

{% for post in posts if post.id < 10 %}
    <h2>{{ post.heading }}</h2>
{% endfor %}

You can even use own TWIG filters for more complexed conditions, like:

{% for post in posts|onlySuperPosts %}
    <h2>{{ post.heading }}</h2>
{% endfor %}

ERROR 1452: Cannot add or update a child row: a foreign key constraint fails

The Problem is with FOREIGN KEY Constraint. By Default (SET FOREIGN_KEY_CHECKS = 1). FOREIGN_KEY_CHECKS option specifies whether or not to check foreign key constraints for InnoDB tables. MySQL - SET FOREIGN_KEY_CHECKS

We can set foreign key check as disable before running Query. Disable Foreign key.

Execute one of these lines before running your query, then you can run your query successfully. :)

1) For Session (recommended)

SET FOREIGN_KEY_CHECKS=0;

2) Globally

SET GLOBAL FOREIGN_KEY_CHECKS=0;

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException

First you should learn about loops, in this case most suitable is for loop. For instance let's initialize whole table with increasing values starting with 0:

final int SIZE = 10;
int[] array = new int[SIZE];
for (int i = 0; i < SIZE; i++) {
    array[i] = i;
}

Now you can modify it to initialize your table with values as per your assignment. But what happen if you replace condition i < SIZE with i < 11? Well, you will get IndexOutOfBoundException, as you try to access (at some point) an object under index 10, but the highest index in 10-element array is 9. So you are trying, in other words, to find friend's home with number 11, but there are only 10 houses in the street.

In case of the code you presented, well, there must be more of it, as you can not get this error (exception) from that code.

How to Display blob (.pdf) in an AngularJS app

Adding responseType to the request that is made from angular is indeed the solution, but for me it didn't work until I've set responseType to blob, not to arrayBuffer. The code is self explanatory:

    $http({
            method : 'GET',
            url : 'api/paperAttachments/download/' + id,
            responseType: "blob"
        }).then(function successCallback(response) {
            console.log(response);
             var blob = new Blob([response.data]);
             FileSaver.saveAs(blob, getFileNameFromHttpResponse(response));
        }, function errorCallback(response) {   
        });

Setting unique Constraint with fluent API?

As an addition to Yorro's answer, it can also be done by using attributes.

Sample for int type unique key combination:

[Index("IX_UniqueKeyInt", IsUnique = true, Order = 1)]
public int UniqueKeyIntPart1 { get; set; }

[Index("IX_UniqueKeyInt", IsUnique = true, Order = 2)]
public int UniqueKeyIntPart2 { get; set; }

If the data type is string, then MaxLength attribute must be added:

[Index("IX_UniqueKeyString", IsUnique = true, Order = 1)]
[MaxLength(50)]
public string UniqueKeyStringPart1 { get; set; }

[Index("IX_UniqueKeyString", IsUnique = true, Order = 2)]
[MaxLength(50)]
public string UniqueKeyStringPart2 { get; set; }

If there is a domain/storage model separation concern, using Metadatatype attribute/class can be an option: https://msdn.microsoft.com/en-us/library/ff664465%28v=pandp.50%29.aspx?f=255&MSPPError=-2147217396

A quick console app example:

using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity;

namespace EFIndexTest
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var context = new AppDbContext())
            {
                var newUser = new User { UniqueKeyIntPart1 = 1, UniqueKeyIntPart2 = 1, UniqueKeyStringPart1 = "A", UniqueKeyStringPart2 = "A" };
                context.UserSet.Add(newUser);
                context.SaveChanges();
            }
        }
    }

    [MetadataType(typeof(UserMetadata))]
    public class User
    {
        public int Id { get; set; }
        public int UniqueKeyIntPart1 { get; set; }
        public int UniqueKeyIntPart2 { get; set; }
        public string UniqueKeyStringPart1 { get; set; }
        public string UniqueKeyStringPart2 { get; set; }
    }

    public class UserMetadata
    {
        [Index("IX_UniqueKeyInt", IsUnique = true, Order = 1)]
        public int UniqueKeyIntPart1 { get; set; }

        [Index("IX_UniqueKeyInt", IsUnique = true, Order = 2)]
        public int UniqueKeyIntPart2 { get; set; }

        [Index("IX_UniqueKeyString", IsUnique = true, Order = 1)]
        [MaxLength(50)]
        public string UniqueKeyStringPart1 { get; set; }

        [Index("IX_UniqueKeyString", IsUnique = true, Order = 2)]
        [MaxLength(50)]
        public string UniqueKeyStringPart2 { get; set; }
    }

    public class AppDbContext : DbContext
    {
        public virtual DbSet<User> UserSet { get; set; }
    }
}

How to add and get Header values in WebApi

For .net Core in GET method, you can do like this:

 StringValues value1;
 string DeviceId = string.Empty;

  if (Request.Headers.TryGetValue("param1", out value1))
      {
                DeviceId = value1.FirstOrDefault();
      }

Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1

The real problem is that you are using dynamic return type in the FacebookClient Get method. And although you use a method for serializing, the JSON converter cannot deserialize this Object after that.

Use insted of:

dynamic result = client.Get("fql", new { q = "select target_id,target_type from connection where source_id = me()"}); 
string jsonstring = JsonConvert.SerializeObject(result);

something like that:

string result = client.Get("fql", new { q = "select target_id,target_type from connection where source_id = me()"}).ToString();

Then you can use DeserializeObject method:

var datalist = JsonConvert.DeserializeObject<List<RootObject>>(result);

Hope this helps.

Is there a real solution to debug cordova apps

Use Android Device Monitor

Android Device Monitor comes packages with android sdk which you would have installed previously. In the device monitor you can see you entire device log, exceptions, messages everything. This is usefully to debug application crashes or any other such problems. To run this, go to tools/ folder inside your android sdk “/var/android-sdk-linux/tools”. Then run the following

chmod +x monitor
./monitor

If you are on windows, directly open the monitor.exe file. There is a tab below “LogCat” where you will see all device related message. You will see all messages here including android device exceptions which are not visible chrome inspect device. Be sure to create filters using the “+” sign in logcat tab, so that you see messages only for your application.

Source: http://excellencenodejsblog.com/phonegap-debugging-your-android-application/

Curl GET request with json parameter

If you really want to submit the GET request with JSON in the body (say for an XHR request and you know the server supports processing the body on GET requests), you can:

curl -X GET \
  -H "Content-type: application/json" \
  -H "Accept: application/json" \
  -d '{"param0":"pradeep"}' \
  "http://server:5050/a/c/getName"

Most modern web servers accept this type of request.

Select rows with same id but different value in another column

$sql="SELECT * FROM TABLE_NAME WHERE item_id=".$item_id;

$query=mysql_query($sql);

while($myrow=mysql_fetch_array($query)) {

echo   print_r($myrow,1);


}

Posting form to different MVC post action depending on the clicked submit button

BEST ANSWER 1:

ActionNameSelectorAttribute mentioned in

http://weblogs.asp.net/scottgu/archive/2007/12/09/asp-net-mvc-framework-part-4-handling-form-edit-and-post-scenarios.aspx

ANSWER 2

Reference: dotnet-tricks - Handling multiple submit buttons on the same form - MVC Razor

Second Approach

Adding a new Form for handling Cancel button click. Now, on Cancel button click we will post the second form and will redirect to the home page.

Third Approach: Client Script

<button name="ClientCancel" type="button" 
    onclick=" document.location.href = $('#cancelUrl').attr('href');">Cancel (Client Side)
</button>
<a id="cancelUrl" href="@Html.AttributeEncode(Url.Action("Index", "Home"))" 
style="display:none;"></a>

How to find pg_config path

You can find the pg_config directory using its namesake:

$ pg_config --bindir
/usr/lib/postgresql/9.1/bin
$

Tested on Mac and Debian. The only wrinkle is that I can't see how to find the bindir for different versions of postgres installed on the same machine. It's fairly easy to guess though! :-)

Note: I updated my pg_config to 9.5 on Debian with:

sudo apt-get install postgresql-server-dev-9.5

mvn command not found in OSX Mavrerick

I got same problem, I tried all above, noting solved my problem. Luckely, I solved the problem this way:

echo $SHELL

Output

/bin/zsh
OR 
/bin/bash

If it showing "bash" in output. You have to add env properties in .bashrc file (.bash_profile i did not tried, you can try) or else
It is showing 'zsh' in output. You have to add env properties in .zshrc file, if not exist already you create one no issue.

Woocommerce get products

Do not use WP_Query() or get_posts(). From the WooCommerce doc:

wc_get_products and WC_Product_Query provide a standard way of retrieving products that is safe to use and will not break due to database changes in future WooCommerce versions. Building custom WP_Queries or database queries is likely to break your code in future versions of WooCommerce as data moves towards custom tables for better performance.

You can retrieve the products you want like this:

$args = array(
    'category' => array( 'hoodies' ),
    'orderby'  => 'name',
);
$products = wc_get_products( $args );

WooCommerce documentation

Note: the category argument takes an array of slugs, not IDs.

Get WooCommerce product categories from WordPress

Improving Suman.hassan95's answer by adding a link to subcategory as well. Replace the following code:

$sub_cats = get_categories( $args2 );
    if($sub_cats) {
        foreach($sub_cats as $sub_category) {
            echo  $sub_category->name ;
        }

    }

with:

$sub_cats = get_categories( $args2 );
            if($sub_cats) {
                foreach($sub_cats as $sub_category) {
                    echo  '<br/><a href="'. get_term_link($sub_category->slug, 'product_cat') .'">'. $sub_category->name .'</a>';
                }
            }

or if you also wish a counter for each subcategory, replace with this:

$sub_cats = get_categories( $args2 );
            if($sub_cats) {
                foreach($sub_cats as $sub_category) {
                    echo  '<br/><a href="'. get_term_link($sub_category->slug, 'product_cat') .'">'. $sub_category->name .'</a>';
                    echo apply_filters( 'woocommerce_subcategory_count_html', ' <span class="cat-count">' . $sub_category->count . '</span>', $category );
                }
            }

Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2

Response you are getting is in object form i.e.

{ 
  "dstOffset" : 3600, 
  "rawOffset" : 36000, 
  "status" : "OK", 
  "timeZoneId" : "Australia/Hobart", 
  "timeZoneName" : "Australian Eastern Daylight Time" 
}

Replace below line of code :

List<Post> postsList = Arrays.asList(gson.fromJson(reader,Post.class))

with

Post post = gson.fromJson(reader, Post.class);

Authentication failed to bitbucket

I was trying the git push --all bitbucket call and it was throwing back the "fatal: Authentication failed for 'https://..." response. The solution that worked for me was to change the command to:

git push --all https://{username}@{url}

On Windows, this popped up a dialog that allowed me to enter my password and the push worked.

Install opencv for Python 3.3

Spent 3 hours trying the various options on Ubuntu 14.04LTS mentioned here and in another referenced tutorial to no avail. For a while tried with OpenCV3.0.0 but eventually switched to 3.1.0. The following worked:

cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D PYTHON3_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython3.4m.so \
-D PYTHON3_EXECUTABLE=/usr/bin/python3.4m \
-D PYTHON3_INCLUDE_DIR=/usr/include/python3.4m/ \
-D PYTHON_INCLUDE_DIR=/usr/include/python3.4m/ \
-D PYTHON3_INCLUDE_DIRS=/usr/include/python3.4m/ \
-D PYTHON_INCLUDE_DIRS=/usr/include/python3.4m/ \
-D BUILD_opencv_python3=ON \
.

output:

--   OpenCV modules:
--     To be built:                 core flann imgproc ml photo video imgcodecs shape videoio highgui objdetect superres ts features2d calib3d stitching videostab python3
--     Disabled:                    java world
--     Disabled by dependency:      -
--     Unavailable:                 cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev python2 viz

--   Python 3:
--     Interpreter:                 /usr/bin/python3.4m (ver 3.4.3)
--     Libraries:                   /usr/lib/x86_64-linux-gnu/libpython3.4m.so (ver 3.4.3)
--     numpy:                       /usr/lib/python3/dist-packages/numpy/core/include (ver 1.8.2)
--     packages path:               /usr/lib/python3/dist-packages
-- 
--   Python (for build):

And with virtualenv used the following cmake options:

cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=$VIRTUAL_ENV \
-D PYTHON3_EXECUTABLE=$VIRTUAL_ENV/bin/python3 \
-D PYTHON3_PACKAGES_PATH=$VIRTUAL_ENV/lib/python3.4/site-packages \
-D PYTHON3_LIBRARY=/usr/lib/x86_64-linux-gnu/libpython3.4m.so \
-D PYTHON3_INCLUDE_DIR=$VIRTUAL_ENV/include/python3.4m \
-D PYTHON_INCLUDE_DIR=$VIRTUAL_ENV/include/python3.4m \
-D PYTHON3_INCLUDE_DIRS=$VIRTUAL_ENV/include/python3.4m \
-D PYTHON_INCLUDE_DIRS=$VIRTUAL_ENV/include/python3.4m \
-D BUILD_opencv_python3=ON \
.

If you have issues with ffmpeg includes add the following to remove video support:

-D WITH_FFMPEG=OFF \
-D WITH_GSTREAMER=OFF \
-D WITH_V4L=OFF \
-D WITH_1394=OFF \

Also take heed of the warning from cmake about using make clean. If you ran make clean you might have to uncompress the original package anew. Cmake is dead, long live the Cmake

no operator "<<" matches these operands

It looks like you're comparing strings incorrectly. To compare a string to another, use the std::string::compare function.

Example

     while ((wrong < MAX_WRONG) && (soFar.compare(THE_WORD) != 0))

Difference in make_shared and normal shared_ptr in C++

I think the exception safety part of mr mpark's answer is still a valid concern. when creating a shared_ptr like this: shared_ptr< T >(new T), the new T may succeed, while the shared_ptr's allocation of control block may fail. in this scenario, the newly allocated T will leak, since the shared_ptr has no way of knowing that it was created in-place and it is safe to delete it. or am I missing something? I don't think the stricter rules on function parameter evaluation help in any way here...

OPTION (RECOMPILE) is Always Faster; Why?

Often when there is a drastic difference from run to run of a query I find that it is often one of 5 issues.

STATISTICS - Statistics are out of date. A database stores statistics on the range and distribution of the types of values in various column on tables and indexes. This helps the query engine to develop a "Plan" of attack for how it will do the query, for example the type of method it will use to match keys between tables using a hash or looking through the entire set. You can call Update Statistics on the entire database or just certain tables or indexes. This slows down the query from one run to another because when statistics are out of date, its likely the query plan is not optimal for the newly inserted or changed data for the same query (explained more later below). It may not be proper to Update Statistics immediately on a Production database as there will be some overhead, slow down and lag depending on the amount of data to sample. You can also choose to use a Full Scan or Sampling to update Statistics. If you look at the Query Plan, you can then also view the statistics on the Indexes in use such using the command DBCC SHOW_STATISTICS (tablename, indexname). This will show you the distribution and ranges of the keys that the query plan is using to base its approach on.
PARAMETER SNIFFING - The query plan that is cached is not optimal for the particular parameters you are passing in, even though the query itself has not changed. For example, if you pass in a parameter which only retrieves 10 out of 1,000,000 rows, then the query plan created may use a Hash Join, however if the parameter you pass in will use 750,000 of the 1,000,000 rows, the plan created may be an index scan or table scan. In such a situation you can tell the SQL statement to use the option OPTION (RECOMPILE) or an SP to use WITH RECOMPILE. To tell the Engine this is a "Single Use Plan" and not to use a Cached Plan which likely does not apply. There is no rule on how to make this decision, it depends on knowing the way the query will be used by users.
INDEXES - Its possible that the query haven't changed, but a change elsewhere such as the removal of a very useful index has slowed down the query.
ROWS CHANGED - The rows you are querying drastically changes from call to call. Usually statistics are automatically updated in these cases. However if you are building dynamic SQL or calling SQL within a tight loop, there is a possibility you are using an outdated Query Plan based on the wrong drastic number of rows or statistics. Again in this case OPTION (RECOMPILE) is useful.
THE LOGIC Its the Logic, your query is no longer efficient, it was fine for a small number of rows, but no longer scales. This usually involves more indepth analysis of the Query Plan. For example, you can no longer do things in bulk, but have to Chunk things and do smaller Commits, or your Cross Product was fine for a smaller set but now takes up CPU and Memory as it scales larger, this may also be true for using DISTINCT, you are calling a function for every row, your key matches don't use an index because of CASTING type conversion or NULLS or functions... Too many possibilities here.

In general when you write a query, you should have some mental picture of roughly how certain data is distributed within your table. A column for example, can have an evenly distributed number of different values, or it can be skewed, 80% of the time have a specific set of values, whether the distribution will varying frequently over time or be fairly static. This will give you a better idea of how to build an efficient query. But also when debugging query performance have a basis for building a hypothesis as to why it is slow or inefficient.

javac: file not found: first.java Usage: javac <options> <source files>

If this is the problem then go to the place where the javac is present and then type

notepad Yourfilename.java
it will ask for creation of the file
say yes and copy the code from your previous source file to this file
now execute the cmd------>javac Yourfilename.java

It will work for sure.

MVC Redirect to View from jQuery with parameters

redirect with query string

 $('#results').on('click', '.item', function () {
                    var NestId = $(this).data('id');
                   // var url = '@Url.Action("Details", "Artists",new { NestId = '+NestId+'  })'; 
                    var url = '@ Url.Content("~/Artists/Details?NestId =' + NestId + '")'
                    window.location.href = url; 
                })

Testing Spring's @RequestBody using Spring MockMVC

the following works for me,

  mockMvc.perform(
            MockMvcRequestBuilders.post("/api/test/url")
                    .contentType(MediaType.APPLICATION_JSON)
                    .content(asJsonString(createItemForm)))
            .andExpect(status().isCreated());

  public static String asJsonString(final Object obj) {
    try {
        return new ObjectMapper().writeValueAsString(obj);
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

How to make join queries using Sequelize on Node.js

In my case i did following thing. In the UserMaster userId is PK and in UserAccess userId is FK of UserMaster

UserAccess.belongsTo(UserMaster,{foreignKey: 'userId'});
UserMaster.hasMany(UserAccess,{foreignKey : 'userId'});
var userData = await UserMaster.findAll({include: [UserAccess]});

Getting error while sending email through Gmail SMTP - "Please log in via your web browser and then try again. 534-5.7.14"

I did this every time the problem happens:

https://accounts.google.com/DisplayUnlockCaptcha

problem sorted in my case!

Trying to check if username already exists in MySQL database using PHP

TRY THIS ONE

 mysql_connect('localhost','dbuser','dbpass');

$query = "SELECT username FROM Users WHERE username='".$username."'";
mysql_select_db('dbname');

    $result=mysql_query($query);

   if (mysql_num_rows($query) != 0)
   {
     echo "Username already exists";
    }

    else
   {
     ...
    }

How to pass json POST data to Web API method as an object?

1)In your client side you can send you http.post request in string like below

var IndexInfo = JSON.stringify(this.scope.IndexTree);
this.$http.post('../../../api/EvaluationProcess/InsertEvaluationProcessInputType', "'" + IndexInfo + "'" ).then((response: any) => {}

2)Then in your web api controller you can deserialize it

public ApiResponce InsertEvaluationProcessInputType([FromBody]string IndexInfo)
    {
var des = (ApiReceivedListOfObjects<TempDistributedIndex>)Newtonsoft.Json.JsonConvert.DeserializeObject(DecryptedProcessInfo, typeof(ApiReceivedListOfObjects<TempDistributedIndex>));}

3)Your ApiReceivedListOfObjects class should be like below

public class ApiReceivedListOfObjects<T>
    {
        public List<T> element { get; set; }

    }

4)make sure that your serialized string (IndexInfo here) becomes like below structure before JsonConvert.DeserializeObject command in step 2

var resp = @"
    {
        ""element"": [
        {
            ""A"": ""A Jones"",
            ""B"": ""500015763""
        },
        {
            ""A"": ""B Smith"",
            ""B"": ""504986213""
        },
        {
            ""A"": ""C Brown"",
            ""B"": ""509034361""
        }
        ]
    }";

How to upload file to server with HTTP POST multipart/form-data?

Basic implementation using MultipartFormDataContent :-

HttpClient httpClient = new HttpClient();
MultipartFormDataContent form = new MultipartFormDataContent();

form.Add(new StringContent(username), "username");
form.Add(new StringContent(useremail), "email");
form.Add(new StringContent(password), "password");            
form.Add(new ByteArrayContent(file_bytes, 0, file_bytes.Length), "profile_pic", "hello1.jpg");
HttpResponseMessage response = await httpClient.PostAsync("PostUrl", form);

response.EnsureSuccessStatusCode();
httpClient.Dispose();
string sd = response.Content.ReadAsStringAsync().Result;

Get Specific Columns Using “With()” Function in Laravel Eloquent

You can also specify columns on related model at the time of accessing it.

Post::first()->user()->get(['columns....']);

Redirect to a page/URL after alert button is pressed

Working example in php.
First Alert then Redirect works....
Enjoy...

echo "<script>";
echo " alert('Import has successfully Done.');      
        window.location.href='".site_url('home')."';
      </script>";

Chrome Extension - Get DOM content

For those who tried gkalpak answer and it did not work,

be aware that chrome will add the content script to a needed page only when your extension enabled during chrome launch and also a good idea restart browser after making these changes

Representing Directory & File Structure in Markdown Syntax

You can use tree to generate something very similar to your example. Once you have the output, you can wrap it in a <pre> tag to preserve the plain text formatting.

HTTP Error 503. The service is unavailable. App pool stops on accessing website

When I first time add the service and created the app pool for it. I did "iisreset" from command prompt, and it worked.

Nexus 7 (2013) and Win 7 64 - cannot install USB driver despite checking many forums and online resources

Depending on the device, sometimes you are getting "The folder you specified doesn't contain a compatible software" error because the first interface isn't actually the ADB interface.

Try installing it as a generic "USB composite device" instead (from the 'pick from a list' driver install option); once the standard composite driver installs it will allow Windows to communicate with the device and detect the associated ADB driver interface and install it properly.

How to replace NA values in a table for selected columns

We can solve it in data.table way with tidyr::repalce_na function and lapply

library(data.table)
library(tidyr)
setDT(df)
df[,c("a","b","c"):=lapply(.SD,function(x) replace_na(x,0)),.SDcols=c("a","b","c")]

In this way, we can also solve paste columns with NA string. First, we replace_na(x,""),then we can use stringr::str_c to combine columns!

Using an image caption in Markdown Jekyll

You can try to use pandoc as your converter. Here's a jekyll plugin to implement this. Pandoc will be able to add a figure caption the same as your alt attribute automatically.

But you have to push the compiled site because github doesn't allow plugins in Github pages for security.

'Best' practice for restful POST response

Returning the new object fits with the REST principle of "Uniform Interface - Manipulation of resources through representations." The complete object is the representation of the new state of the object that was created.

There is a really excellent reference for API design, here: Best Practices for Designing a Pragmatic RESTful API

It includes an answer to your question here: Updates & creation should return a resource representation

It says:

To prevent an API consumer from having to hit the API again for an updated representation, have the API return the updated (or created) representation as part of the response.

Seems nicely pragmatic to me and it fits in with that REST principle I mentioned above.

if (boolean condition) in Java

ABoolean (with a uppercase 'B') is a Boolean object, which if not assigned a value, will default to null. boolean (with a lowercase 'b') is a boolean primitive, which if not assigned a value, will default to false.

Boolean objectBoolean;
boolean primitiveBoolean;

System.out.println(objectBoolean); // will print 'null'
System.out.println(primitiveBoolean); // will print 'false'

Citation

so in your code because boolean with small 'b' is declared it will set to false hence

boolean turnedOn;
    if(turnedOn) **meaning true**
    {
    //do stuff when the condition is false or true?
    }
    else
    {
    //do else of if ** itwill do this part bechae it is false
    }

the if(turnedon) tests a value if true, you didnt assign a value for turned on making it false, making it do the else statement :)

What is a regex to match ONLY an empty string?

I would use a negative lookahead for any character:

^(?![\s\S])

This can only match if the input is totally empty, because the character class will match any character, including any of the various newline characters.

Reading JSON POST using PHP

You have empty $_POST. If your web-server wants see data in json-format you need to read the raw input and then parse it with JSON decode.

You need something like that:

$json = file_get_contents('php://input');
$obj = json_decode($json);

Also you have wrong code for testing JSON-communication...

CURLOPT_POSTFIELDS tells curl to encode your parameters as application/x-www-form-urlencoded. You need JSON-string here.

UPDATE

Your php code for test page should be like that:

$data_string = json_encode($data);

$ch = curl_init('http://webservice.local/');
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "POST");
curl_setopt($ch, CURLOPT_POSTFIELDS, $data_string);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, array(
        'Content-Type: application/json',
        'Content-Length: ' . strlen($data_string))
);

$result = curl_exec($ch);
$result = json_decode($result);
var_dump($result);

Also on your web-service page you should remove one of the lines header('Content-type: application/json');. It must be called only once.

Can I safely delete contents of Xcode Derived data folder?

I purge derivedData often enough that I have an alias for it. It can fix build problems. I have the following in /Users/Myusername/.bash_profile

alias purgeallbuilds='rm -rf ~/Library/Developer/Xcode/DerivedData/*'

Then in terminal, I type purgeallbuilds, and all subfolders of DerivedData are deleted.

Warning: mysqli_query() expects parameter 1 to be mysqli, null given in

The getPosts() function seems to be expecting $con to be global, but you're not declaring it as such.

A lot of programmers regard bald global variables as a "code smell". The alternative at the other end of the scale is to always pass around the connection resource. Partway between the two is a singleton call that always returns the same resource handle.

New og:image size for Facebook share?

Tried to get the 1200x630 image working. Facebook kept complaining that it couldn't read the image, or that it was too small (it was a jpeg image ~150Kb).

Switched to a 200x200 size image, worked perfectly.

https://developers.facebook.com/tools/debug/og/object?q=drift.team

Trying to handle "back" navigation button action in iOS

Use a custom UINavigationController subclass, which implements the shouldPop method.

In Swift:

class NavigationController: UINavigationController, UINavigationBarDelegate
{
    var shouldPopHandler: (() -> Bool)?

    func navigationBar(_ navigationBar: UINavigationBar, shouldPop item: UINavigationItem) -> Bool
    {
        if let shouldPopHandler = self.shouldPopHandler, !shouldPopHandler()
        {
            return false
        }
        self.popViewController(animated: true) // Needed!
        return true
    }
}

When set, your shouldPopHandler() will be called to decide whether the controller will be pop or not. When not set it will just get popped as usual.

It is a good idea to disable UINavigationControllers interactivePopGestureRecognizer as the gesture won't call your handler otherwise.

'cannot open git-upload-pack' error in Eclipse when cloning or pushing git repository

It happens due to the following Reasons:

1) Firewall.

2) Network Issues.

3) Proxy Settings Mismatch

4) Connected through different Router - which is not authorized within the network.

5) Git Proxy Authentication Details

How do I count unique visitors to my site?

for finding out that user is new or old , Get user IP .

create a table for IPs and their visits timestamp .

check IF IP does not exists OR time()-saved_timestamp > 60*60*24 (for 1 day) ,edit the IP's timestamp to time() (means now) and increase your view one .

else , do nothing .

FYI : user IP is stored in $_SERVER['REMOTE_ADDR'] variable

Center content in responsive bootstrap navbar

This code worked for me

.navbar .navbar-nav {
    display: inline-block;
    float: none;
}
.navbar .navbar-collapse {
    text-align: center;
}

CSS hide scroll bar if not needed

You can use both .content and .container to overflow:auto. Means if it's text is exceed automatically scroll will come x-axis and y-axis. (no need to give separete x-axis and y-axis commonly give overflow:auto)

.content {overflow:auto;}

Android: Create a toggle button with image and no text

Can I replace the toggle text with an image

No, we can not, although we can hide the text by overiding the default style of the toggle button, but still that won't give us a toggle button you want as we can't replace the text with an image.

How can I make a normal toggle button

Create a file ic_toggle in your res/drawable folder

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_checked="false"
          android:drawable="@drawable/ic_slide_switch_off" />

    <item android:state_checked="true"
          android:drawable="@drawable/ic_slide_switch_on" />

</selector>

Here @drawable/ic_slide_switch_on & @drawable/ic_slide_switch_off are images you create.

Then create another file in the same folder, name it ic_toggle_bg

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:id="@+android:id/background"  
          android:drawable="@android:color/transparent" />

    <item android:id="@+android:id/toggle"
          android:drawable="@drawable/ic_toggle" />

</layer-list>

Now add to your custom theme, (if you do not have one create a styles.xml file in your res/values/folder)

<style name="Widget.Button.Toggle" parent="android:Widget">
   <item name="android:background">@drawable/ic_toggle_bg</item>
   <item name="android:disabledAlpha">?android:attr/disabledAlpha</item>
</style>

<style name="toggleButton"  parent="@android:Theme.Black">
   <item name="android:buttonStyleToggle">@style/Widget.Button.Toggle</item>
   <item name="android:textOn"></item>
   <item name="android:textOff"></item>
</style>

This creates a custom toggle button for you.

How to use it

Use the custom style and background in your view.

  <ToggleButton
        android:id="@+id/toggleButton"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:layout_gravity="right"
        style="@style/toggleButton"
        android:background="@drawable/ic_toggle_bg"/>

I have never set any passwords to my keystore and alias, so how are they created?

Keystore name: "debug.keystore"

Keystore password: "android"

Key alias: "androiddebugkey"

Key password: "android"

I use this information and successfully generate Signed APK.

How to simulate POST request?

This should help if you need a publicly exposed website but you're on a dev pc. Also to answer (I can't comment yet): "How do I post to an internal only running development server with this? – stryba "

NGROK creates a secure public URL to a local webserver on your development machine (Permanent URLs available for a fee, temporary for free).
1) Run ngrok.exe to open command line (on desktop)
2) Type ngrok.exe http 80 to start a tunnel,
3) test by browsing to the displayed web address which will forward and display the local default 80 page on your dev pc

Then use some of the tools recommended above to POST to your ngrok site ('https://xxxxxx.ngrok.io') to test your local code.

https://ngrok.com/ ngrok

Why isn't .ico file defined when setting window's icon?

You need to have favicon.ico in the same folder or dictionary as your script because python only searches in the current dictionary or you could put in the full pathname. For example, this works:

from tkinter import *
root = Tk()

root.iconbitmap(r'c:\Python32\DLLs\py.ico')
root.mainloop()

But this blows up with your same error:

from tkinter import *
root = Tk()

root.iconbitmap('py.ico')
root.mainloop()

Mail not sending with PHPMailer over SSL using SMTP

Firstly, use these settings for Google:

$mail->IsSMTP();
$mail->Host = "smtp.gmail.com";
$mail->SMTPAuth = true;
$mail->SMTPSecure = "tls"; //edited from tsl
$mail->Username = "myEmail";
$mail->Password = "myPassword";
$mail->Port = "587";

But also, what firewall have you got set up?

If you're filtering out TCP ports 465/995, and maybe 587, you'll need to configure some exceptions or take them off your rules list.

https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

Column count doesn't match value count at row 1

you missed the comma between two values or column name
you put extra values or an extra column name

How to pass data to view in Laravel?

You can use the following to pass data to view in Laravel:

public function contact($id) {
    return view('contact',compact('id'));
}

Why I'm getting 'Non-static method should not be called statically' when invoking a method in a Eloquent model?

Just in case this helps someone, I was getting this error because I completely missed the stated fact that the scope prefix must not be used when calling a local scope. So if you defined a local scope in your model like this:

public function scopeRecentFirst($query)
{
    return $query->orderBy('updated_at', 'desc');
}

You should call it like:

$CurrentUsers = \App\Models\Users::recentFirst()->get();

Note that the prefix scope is not present in the call.

Android Studio - local path doesn't exist

For me uninstalling the app from the device works. :)

How to create a secure random AES key in Java?

I would use your suggested code, but with a slight simplification:

KeyGenerator keyGen = KeyGenerator.getInstance("AES");
keyGen.init(256); // for example
SecretKey secretKey = keyGen.generateKey();

Let the provider select how it plans to obtain randomness - don't define something that may not be as good as what the provider has already selected.

This code example assumes (as Maarten points out below) that you've configured your java.security file to include your preferred provider at the top of the list. If you want to manually specify the provider, just call KeyGenerator.getInstance("AES", "providerName");.

For a truly secure key, you need to be using a hardware security module (HSM) to generate and protect the key. HSM manufacturers will typically supply a JCE provider that will do all the key generation for you, using the code above.

Compiling dynamic HTML strings from database

ng-bind-html-unsafe only renders the content as HTML. It doesn't bind Angular scope to the resulted DOM. You have to use $compile service for that purpose. I created this plunker to demonstrate how to use $compile to create a directive rendering dynamic HTML entered by users and binding to the controller's scope. The source is posted below.

demo.html

<!DOCTYPE html>
<html ng-app="app">

  <head>
    <script data-require="[email protected]" data-semver="1.0.7" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.js"></script>
    <script src="script.js"></script>
  </head>

  <body>
    <h1>Compile dynamic HTML</h1>
    <div ng-controller="MyController">
      <textarea ng-model="html"></textarea>
      <div dynamic="html"></div>
    </div>
  </body>

</html>

script.js

var app = angular.module('app', []);

app.directive('dynamic', function ($compile) {
  return {
    restrict: 'A',
    replace: true,
    link: function (scope, ele, attrs) {
      scope.$watch(attrs.dynamic, function(html) {
        ele.html(html);
        $compile(ele.contents())(scope);
      });
    }
  };
});

function MyController($scope) {
  $scope.click = function(arg) {
    alert('Clicked ' + arg);
  }
  $scope.html = '<a ng-click="click(1)" href="#">Click me</a>';
}

What is the cause for "angular is not defined"

You have to put your script tag after the one that references Angular. Move it out of the head:

<script type="text/javascript" src="angular.min.js"></script>
<script type="text/javascript" src="main.js"></script>

The way you've set it up now, your script runs before Angular is loaded on the page.

Referencing another schema in Mongoose

It sounds like the populate method is what your looking for. First make small change to your post schema:

var postSchema = new Schema({
    name: String,
    postedBy: {type: mongoose.Schema.Types.ObjectId, ref: 'User'},
    dateCreated: Date,
    comments: [{body:"string", by: mongoose.Schema.Types.ObjectId}],
});

Then make your model:

var Post = mongoose.model('Post', postSchema);

Then, when you make your query, you can populate references like this:

Post.findOne({_id: 123})
.populate('postedBy')
.exec(function(err, post) {
    // do stuff with post
});

Android Fatal signal 11 (SIGSEGV) at 0x636f7d89 (code=1). How can it be tracked down?

If you had added some native C code in your project this answer could be helpful.

I had added some native C code in android project.

Now i was trying to access that code which was returning native string to me, before processing the the string i had set its default value as nullptr. Now upon retrieving its value in java code ran into this issue.

As our native C code is out from java directory so getting no clue of exact line of code which is creating the issue. So i would suggest you to check your .cpp file and try to find any clue there.

Hope so you will get rid of the issue soon. :)

Django error - matching query does not exist

You can use this:

comment = Comment.objects.filter(pk=comment_id)

Remove category & tag base from WordPress url - without a plugin

updated answer:

other solution:
In wp-includes/rewrite.php file, you'll see the code:
$this->category_structure = $this->front . 'category/'; just copy whole function, put in your functions.php and hook it. just change the above line with:
$this->category_structure = $this->front . '/';

Laravel 4: how to "order by" using Eloquent ORM

If you are using the Eloquent ORM you should consider using scopes. This would keep your logic in the model where it belongs.

So, in the model you would have:

public function scopeIdDescending($query)
{
        return $query->orderBy('id','DESC');
}

And outside the model you would have:

$posts = Post::idDescending()->get();

More info: http://laravel.com/docs/eloquent#query-scopes

Showing/Hiding Table Rows with Javascript - can do with ID - how to do with Class?

You can change the class of the entire table and use the cascade in the CSS: http://jsbin.com/oyunuy/1/

How to POST the data from a modal form of Bootstrap?

You need to handle it via ajax submit.

Something like this:

$(function(){
    $('#subscribe-email-form').on('submit', function(e){
        e.preventDefault();
        $.ajax({
            url: url, //this is the submit URL
            type: 'GET', //or POST
            data: $('#subscribe-email-form').serialize(),
            success: function(data){
                 alert('successfully submitted')
            }
        });
    });
});

A better way would be to use a django form, and then render the following snippet:

<form>
    <div class="modal-body">
        <input type="email" placeholder="email"/>
        <p>This service will notify you by email should any issue arise that affects your plivo service.</p>
    </div>
    <div class="modal-footer">
        <input type="submit" value="SUBMIT" class="btn"/>
    </div>
</form>

via the context - example : {{form}}.

How to generate and manually insert a uniqueidentifier in sql server?

ApplicationId must be of type UniqueIdentifier. Your code works fine if you do:

DECLARE @TTEST TABLE
(
  TEST UNIQUEIDENTIFIER
)

DECLARE @UNIQUEX UNIQUEIDENTIFIER
SET @UNIQUEX = NEWID();

INSERT INTO @TTEST
(TEST)
VALUES
(@UNIQUEX);

SELECT * FROM @TTEST

Therefore I would say it is safe to assume that ApplicationId is not the correct data type.

Relative URLs in WordPress

<?php wp_make_link_relative( $link ) ?>

Convert full URL paths to relative paths.

Removes the http or https protocols and the domain. Keeps the path '/' at the beginning, so it isn't a true relative link, but from the web root base.

Reference: Wordpress Codex

PHP Redirect to another page after form submit

Right after @mail($email_to, $email_subject, $email_message, $headers);

header('Location: nextpage.php');

Note that you will never see 'Thanks for subscribing to our mailing list'

That should be on the next page, if you echo any text you will get an error because the headers would have been already created, if you want to redirect never return any text, not even a space!

Could not find com.google.android.gms:play-services:3.1.59 3.2.25 4.0.30 4.1.32 4.2.40 4.2.42 4.3.23 4.4.52 5.0.77 5.0.89 5.2.08 6.1.11 6.1.71 6.5.87

I too had the same problem and resolved.

As per the above-mentioned solutions by others, I tried all the things and it does not solve my problem.

Even if you have two SDK locations, no need to worry about it and check whether your android home is set to Android studio SDK (If you have the Android repository and everything in that SDK location).

Solution:

Go to Your project structure
Select your modules
Click the dependance tap on the right side
Add library dependency
"com.google.android.gms:play-service:+"

I hope it will solve your problem.

Align text to the bottom of a div

Flex Solution

It is perfectly fine if you want to go with the display: table-cell solution. But instead of hacking it out, we have a better way to accomplish the same using display: flex;. flex is something which has a decent support.

_x000D_

.wrap {_x000D_
  height: 200px;_x000D_
  width: 200px;_x000D_
  border: 1px solid #aaa;_x000D_
  margin: 10px;_x000D_
  display: flex;_x000D_
}_x000D_
_x000D_
.wrap span {_x000D_
  align-self: flex-end;_x000D_
}

_x000D_

<div class="wrap">_x000D_
  <span>Align me to the bottom</span>_x000D_
</div>

_x000D_

In the above example, we first set the parent element to display: flex; and later, we use align-self to flex-end. This helps you push the item to the end of the flex parent.

Old Solution (Valid if you are not willing to use `flex`)

If you want to align the text to the bottom, you don't have to write so many properties for that, using display: table-cell; with vertical-align: bottom; is enough

_x000D_

div {_x000D_
  display: table-cell;_x000D_
  vertical-align: bottom;_x000D_
  border: 1px solid #f00;_x000D_
  height: 100px;_x000D_
  width: 100px;_x000D_
}

_x000D_

<div>Hello</div>

_x000D_

(Or JSFiddle)

Selenium WebDriver findElement(By.xpath()) not working for me

You can use contains too:

element = findElement(By.xpath("//input[contains (@test-id,"test-username")]");

Parsing jQuery AJAX response

 $.ajax({     
     type: "POST",
     url: '/admin/systemgoalssystemgoalupdate?format=html',
     data: formdata,
     success: function (data) {
         console.log(data);
     },
     dataType: "json"
 });

POST request with JSON body

You need to use the cURL library to send this request.

<?php
// Your ID and token
$blogID = '8070105920543249955';
$authToken = 'OAuth 2.0 token here';

// The data to send to the API
$postData = array(
    'kind' => 'blogger#post',
    'blog' => array('id' => $blogID),
    'title' => 'A new post',
    'content' => 'With <b>exciting</b> content...'
);

// Setup cURL
$ch = curl_init('https://www.googleapis.com/blogger/v3/blogs/'.$blogID.'/posts/');
curl_setopt_array($ch, array(
    CURLOPT_POST => TRUE,
    CURLOPT_RETURNTRANSFER => TRUE,
    CURLOPT_HTTPHEADER => array(
        'Authorization: '.$authToken,
        'Content-Type: application/json'
    ),
    CURLOPT_POSTFIELDS => json_encode($postData)
));

// Send the request
$response = curl_exec($ch);

// Check for errors
if($response === FALSE){
    die(curl_error($ch));
}

// Decode the response
$responseData = json_decode($response, TRUE);

// Close the cURL handler
curl_close($ch);

// Print the date from the response
echo $responseData['published'];

If, for some reason, you can't/don't want to use cURL, you can do this:

<?php
// Your ID and token
$blogID = '8070105920543249955';
$authToken = 'OAuth 2.0 token here';

// The data to send to the API
$postData = array(
    'kind' => 'blogger#post',
    'blog' => array('id' => $blogID),
    'title' => 'A new post',
    'content' => 'With <b>exciting</b> content...'
);

// Create the context for the request
$context = stream_context_create(array(
    'http' => array(
        // http://www.php.net/manual/en/context.http.php
        'method' => 'POST',
        'header' => "Authorization: {$authToken}\r\n".
            "Content-Type: application/json\r\n",
        'content' => json_encode($postData)
    )
));

// Send the request
$response = file_get_contents('https://www.googleapis.com/blogger/v3/blogs/'.$blogID.'/posts/', FALSE, $context);

// Check for errors
if($response === FALSE){
    die('Error');
}

// Decode the response
$responseData = json_decode($response, TRUE);

// Print the date from the response
echo $responseData['published'];

Node Version Manager install - nvm command not found

Check your .bash_profile, .zshrc, or .profile file. You most likely had a problem during the installation.

You should have the following at the end of one of those files.

[[ -s $HOME/.nvm/nvm.sh ]] && . $HOME/.nvm/nvm.sh  # This loads NVM

The . $HOME/.nvm/nvm.sh is the same as source $HOME/.nvm/nvm.sh

See: Sourcing a File

You can also check to see if you have a .nvm folder.

ls -a | grep .nvm

If you're missing that folder then the installation failed to run the git command. This could be due to being behind a proxy. Try running the following instead.

git clone http://github.com/creationix/nvm.git .nvm

How can I send cookies using PHP curl in addition to CURLOPT_COOKIEFILE?

If the cookie is generated from script, then you can send the cookie manually along with the cookie from the file(using cookie-file option). For example:

# sending manually set cookie
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Cookie: test=cookie"));

# sending cookies from file
curl_setopt($ch, CURLOPT_COOKIEFILE, $ckfile);

In this case curl will send your defined cookie along with the cookies from the file.

If the cookie is generated through javascrript, then you have to trace it out how its generated and then you can send it using the above method(through http-header).

The utma utmc, utmz are seen when cookies are sent from Mozilla. You shouldn't bet worry about these things anymore.

Finally, the way you are doing is alright. Just make sure you are using absolute path for the file names(i.e. /var/dir/cookie.txt) instead of relative one.

Always enable the verbose mode when working with curl. It will help you a lot on tracing the requests. Also it will save lot of your times.

curl_setopt($ch, CURLOPT_VERBOSE, true);

ASP.NET: HTTP Error 500.19 – Internal Server Error 0x8007000d

Installing ASP.NET Core Runtime Hosting Bundle solved the issue for me. Source: 500.19 Internal Server Error (0x8007000d)

How do you specify the Java compiler version in a pom.xml file?

I faced same issue in eclipse neon simple maven java project

But I add below details inside pom.xml file

   <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.6.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

After right click on project > maven > update project (checked force update)

Its resolve me to display error on project

Hope it's will helpful

Thansk

jQuery function to open link in new window

Try adding return false; in your click callback like this -

$(document).ready(function() {
  $('.popup').click(function(event) {
      window.open($(this).attr("href"), "popupWindow", "width=600,height=600,scrollbars=yes");
      return false;
  });
});

node.js: cannot find module 'request'

ReferenceError: Can't find variable: require.

You have installed "npm", you can run as normal the script to a "localhost" "127.0.0.1".

When you use the http.clientRequest() with "options" in a "npm" you need to install "RequireJS" inside of the module.

A module is any file or directory in the node_modules directory that can be loaded by the Node. Install "RequiereJS" for to make work the http.clientRequest(options).

how to get last insert id after insert query in codeigniter active record

because you have initiated the Transaction over the data insertion so, The first check the transaction completed or not. once you start the transaction, it should be committed or rollback according to the status of the transaction;

function add_post($post_data){
  $this->db->trans_begin() 
  $this->db->insert('posts',$post_data);
  $this->db->trans_complete();
  if ($this->db->trans_status() === FALSE){
    $this->db->trans_rollback();
    return 0;
  }else{
    $this->db->trans_commit();
    return $this->db->insert_id();
  }
}``

in the above, we have committed the data on the successful transaction even you get the timestamp

MVC4 Passing model from view to controller

I hope this complete example will help you.

This is the TaxiInfo class which holds information about a taxi ride:

namespace Taxi.Models
{
    public class TaxiInfo
    {
        public String Driver { get; set; }
        public Double Fare { get; set; }
        public Double Distance { get; set; }
        public String StartLocation { get; set; }
        public String EndLocation { get; set; }
    }
}

We also have a convenience model which holds a List of TaxiInfo(s):

namespace Taxi.Models
{
    public class TaxiInfoSet
    {
        public List<TaxiInfo> TaxiInfoList { get; set; }

        public TaxiInfoSet(params TaxiInfo[] TaxiInfos)
        {
            TaxiInfoList = new List<TaxiInfo>();

            foreach(var TaxiInfo in TaxiInfos)
            {
                TaxiInfoList.Add(TaxiInfo);
            }
        }
    }
}

Now in the home controller we have the default Index action which for this example makes two taxi drivers and adds them to the list contained in a TaxiInfo:

public ActionResult Index()
{
    var taxi1 = new TaxiInfo() { Fare = 20.2, Distance = 15, Driver = "Billy", StartLocation = "Perth", EndLocation = "Brisbane" };
    var taxi2 = new TaxiInfo() { Fare = 2339.2, Distance = 1500, Driver = "Smith", StartLocation = "Perth", EndLocation = "America" };

    return View(new TaxiInfoSet(taxi1,taxi2));
}

The code for the view is as follows:

@model Taxi.Models.TaxiInfoSet
@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

@foreach(var TaxiInfo in Model.TaxiInfoList){
    <form>
        <h1>Cost: [email protected]</h1>
        <h2>Distance: @(TaxiInfo.Distance) km</h2>
        <p>
            Our diver, @TaxiInfo.Driver will take you from @TaxiInfo.StartLocation to @TaxiInfo.EndLocation
        </p>
        @Html.ActionLink("Home","Booking",TaxiInfo)
    </form>
}

The ActionLink is responsible for the re-directing to the booking action of the Home controller (and passing in the appropriate TaxiInfo object) which is defiend as follows:

    public ActionResult Booking(TaxiInfo Taxi)
    {
        return View(Taxi);
    }

This returns a the following view:

@model Taxi.Models.TaxiInfo

@{
    ViewBag.Title = "Booking";
}

<h2>Booking For</h2>
<h1>@Model.Driver, going from @Model.StartLocation to @Model.EndLocation (a total of @Model.Distance km) for [email protected]</h1>

A visual tour:

The Index view

The Booking view

How to insert a large block of HTML in JavaScript?

If you are using on the same domain then you can create a seperate HTML file and then import this using the code from this answer by @Stano :

https://stackoverflow.com/a/34579496/2468603

Submit button doesn't work

Hello from the future.

For clarity, I just wanted to add (as this was pretty high up in google) - we can now use

<button type="submit">Upload Stuff</button>

And to reset a form

<button type="reset" value="Reset">Reset</button>

Check out button types

We can also attach buttons to submit forms like this:

<button type="submit" form="myform" value="Submit">Submit</button>

Auto-fit TextView for Android

Since Android O, it's possible to auto resize text in xml:

https://developer.android.com/preview/features/autosizing-textview.html

  <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:autoSizeTextType="uniform"
    app:autoSizeMinTextSize="12sp"
    app:autoSizeMaxTextSize="100sp"
    app:autoSizeStepGranularity="2sp"
  />

Android O allows you to instruct a TextView to let the text size expand or contract automatically to fill its layout based on the TextView's characteristics and boundaries. This setting makes it easier to optimize the text size on different screens with dynamic content.

The Support Library 26.0 Beta provides full support to the autosizing TextView feature on devices running Android versions prior to Android O. The library provides support to Android 4.0 (API level 14) and higher. The android.support.v4.widget package contains the TextViewCompat class to access features in a backward-compatible fashion.

Forbidden You don't have permission to access /wp-login.php on this server

Sometimes if you are using some simple login info like this: username: 'admin' and pass: 'admin', the hosting is seeing you as a potential Brute Force Attack through WP login file, and blocks you IP address or that particularly file.

I had that issue with ixwebhosting and just got that info from their support guy. They must unban your IP in this situation. And you must change your WP admin login info to something more secure.

That solved my problem.

How to use Sublime over SSH

I am on MacOS, and the most convenient way for me is to using CyberDuck, which is free (also available for Windows). You can connect to your remote SSH file system and edit your file using your local editor. What CyberDuck does is download the file to a temporary place on your local OS and open it with your editor. Once you save the file, CyberDuck automatically upload it to your remote system. It seems transparent as if you are editing your remote file using your local editor. The developers of Cyberduck also make MountainDuck for mounting remote files systems.

disable past dates on datepicker

Below solution worked for me. I hope, this will help you also.

$(document).ready(function() {
    $("#datepicker").datepicker({ startDate:'+0d' });
});

How can I catch a ctrl-c event?

For a Windows console app, you want to use SetConsoleCtrlHandler to handle CTRL+C and CTRL+BREAK.

See here for an example.

HTTP POST Returns Error: 417 "Expectation Failed."

For Powershell it is

[System.Net.ServicePointManager]::Expect100Continue = $false

Titlecase all entries into a form_for text field

You don't want to take care of normalizing your data in a view - what if the user changes the data that gets submitted? Instead you could take care of it in the model using the before_save (or the before_validation) callback. Here's an example of the relevant code for a model like yours:

class Place < ActiveRecord::Base   before_save do |place|     place.city = place.city.downcase.titleize     place.country = place.country.downcase.titleize   end end

You can also check out the Ruby on Rails guide for more info.

To answer you question more directly, something like this would work:

<%= f.text_field :city, :value => (f.object.city ? f.object.city.titlecase : '') %>

This just means if f.object.city exists, display the titlecase version of it, and if it doesn't display a blank string.

jQuery Mobile: document ready vs. page events

While you use .on(), it's basically a live query that you are using.

On the other hand, .ready (as in your case) is a static query. While using it, you can dynamically update data and do not have to wait for the page to load. You can simply pass on the values into your database (if required) when a particular value is entered.

The use of live queries is common in forms where we enter data (account or posts or even comments).

Getting random numbers in Java

The first solution is to use the java.util.Random class:

import java.util.Random;

Random rand = new Random();

// Obtain a number between [0 - 49].
int n = rand.nextInt(50);

// Add 1 to the result to get a number from the required range
// (i.e., [1 - 50]).
n += 1;

Another solution is using Math.random():

double random = Math.random() * 49 + 1;

int random = (int)(Math.random() * 50 + 1);

Populating a ComboBox using C#

To make it read-only, the DropDownStyle property to DropDownStyle.DropDownList.

To populate the ComboBox, you will need to have a object like Language or so containing both for instance:

public class Language {
    public string Name { get; set; }
    public string Code { get; set; }
}

Then, you may bind a IList to your ComboBox.DataSource property like so:

IList<Language> languages = new List<Language>();
languages.Add(new Language("English", "en"));
languages.Add(new Language("French", "fr"));

ComboxBox.DataSource = languages;
ComboBox.DisplayMember = "Name";
ComboBox.ValueMember = "Code";

This will do exactly what you expect.

When should you NOT use a Rules Engine?

I would strongly recommend business rules engines like Drools as open source or Commercial Rules Engine such as LiveRules.

When you have a lot of business policies which are volatile in nature, it is very hard to maintain that part of the core technology code.
The rules engine provides a great flexibility of the framework and easy to change and deploy.
Rules engines are not to be used everywhere but need to used when you have lot of policies where changes are inevitable on a regular basis.

Why do 64-bit DLLs go to System32 and 32-bit DLLs to SysWoW64 on 64-bit Windows?

Other folks have already done a good job of explaining this ridiculus conundrum ... and I think Chris Hoffman did an even better job here: https://www.howtogeek.com/326509/whats-the-difference-between-the-system32-and-syswow64-folders-in-windows/

My two thoughts:

We all make stupid short-sighted mistakes in life. When Microsoft named their (at the time) Win32 DLL directory "System32", it made sense at the time ... they just didn't take into consideration what would happen if/when a 64-bit (or 128-bit) version of their OS got developed later - and the massive backward compatibility issue such a directory name would cause. Hindsight is always 20-20, so I can't really blame them (too much) for such a mistake. ...HOWEVER... When Microsoft did later develop their 64-bit operating system, even with the benefit of hindsight, why oh why would they make not only the exact same short-sighted mistake AGAIN but make it even worse by PURPOSEFULLY giving it such a misleading name?!? Shame on them!!! Why not AT LEAST actually name the directory "SysWin32OnWin64" to avoid confusion?!? And what happens when they eventually produce a 128-bit OS ... then where are they going to put their 32-bit, 64-bit, and 128-bit DLLs?!?
All of this logic still seems completely flawed to me. On 32-bit versions of Windows, System32 contains 32-bit DLLs; on 64-bit versions of Windows, System32 contains 64-bit DLLs ... so that developers wouldn't have to make code changes, correct? The problem with this logic is that those developers are either now making 64-bit apps needing 64-bit DLLs or they're making 32-bit apps needing 32-bit DLLs ... either way, aren't they still screwed? I mean, if they're still making a 32-bit app, for it to now run on a 64-bit Windows, they'll now need to make a code change to find/reference the same ol' 32-bit DLL they used before (now located in SysWOW64). Or, if they're working on a 64-bit app, they're going to need to re-write their old app for the new OS anyway ... so a recompile/rebuild was going to be needed anyway!!!

Microsoft just hurts me sometimes.

Append a dictionary to a dictionary

Assuming that you do not want to change orig, you can either do a copy and update like the other answers, or you can create a new dictionary in one step by passing all items from both dictionaries into the dict constructor:

from itertools import chain
dest = dict(chain(orig.items(), extra.items()))

Or without itertools:

dest = dict(list(orig.items()) + list(extra.items()))

Note that you only need to pass the result of items() into list() on Python 3, on 2.x dict.items() already returns a list so you can just do dict(orig.items() + extra.items()).

As a more general use case, say you have a larger list of dicts that you want to combine into a single dict, you could do something like this:

from itertools import chain
dest = dict(chain.from_iterable(map(dict.items, list_of_dicts)))

Windows command prompt log to a file

You can redirect the output of a cmd prompt to a file using > or >> to append to a file.

i.e.

echo Hello World >C:\output.txt
echo Hello again! >>C:\output.txt

mybatchfile.bat >C:\output.txt

Note that using > will automatically overwrite the file if it already exists.

You also have the option of redirecting stdin, stdout and stderr.

See here for a complete list of options.

How to make an ImageView with rounded corners?

I used a Path to draw only corners on the image Canvas. (I needed solution with no bitmap memory allocation)

@Override
protected void onDraw(final Canvas canvas) {
    super.onDraw(canvas);

    if (!hasRoundedCorners()) return;

    mPaint.setStyle(Paint.Style.FILL);
    mPaint.setStrokeWidth(0);

    Path path = new Path();
    path.setFillType(Path.FillType.INVERSE_WINDING);
    path.addRoundRect(new RectF(0, 0, getWidth(), getHeight()), mRadius, mRadius, Path.Direction.CCW);
    canvas.drawPath(path, mPaint);
}

Notice that you should not allocate any new object in onDraw method. This code is a proof of concept and should not be used like this in product code

See more: https://medium.com/@przemek.materna/rounded-image-view-no-bitmap-reallocation-11a8b163484d

Bootstrap 3.0 Sliding Menu from left

I believe that although javascript is an option here, you have a smoother animation through forcing hardware accelerate with CSS3. You can achieve this by setting the following CSS3 properties on the moving div:

div.hardware-accelarate {
     -webkit-transform: translate3d(0,0,0);
        -moz-transform: translate3d(0,0,0);
         -ms-transform: translate3d(0,0,0);
          -o-transform: translate3d(0,0,0);
             transform: translate3d(0,0,0);
}

I've made a plunkr setup for ya'll to test and tweak...

how to declare global variable in SQL Server..?

It is not possible to declare global variables in SQL Server. Sql server has a concept of global variables, but they are system defined and can not be extended.

obviously you can do all kinds of tricks with the SQL you are sending - SqlCOmmand has such a variable replacement mechanism for example - BEFORE you send it to SqlServer, but that is about it.

AngularJS ngClass conditional

Your first attempt was almost right, It should work without the quotes.

{test: obj.value1 == 'someothervalue'}

Here is a plnkr.

The ngClass directive will work with any expression that evaluates truthy or falsey, a bit similar to Javascript expressions but with some differences, you can read about here. If your conditional is too complex, then you can use a function that returns truthy or falsey, as you did in your third attempt.

Just to complement: You can also use logical operators to form logical expressions like

ng-class="{'test': obj.value1 == 'someothervalue' || obj.value2 == 'somethingelse'}"

Count number of rows within each group

The simple option to use with aggregate is the length function which will give you the length of the vector in the subset. Sometimes a little more robust is to use function(x) sum( !is.na(x) ).

Why do you create a View in a database?

Among other things, it can be used for security. If you have a "customer" table, you might want to give all of your sales people access to the name, address, zipcode, etc. fields, but not credit_card_number. You can create a view that only includes the columns they need access to and then grant them access on the view.

How do I turn off Unicode in a VC++ project?

None of the above solutions worked for me. But

#include <Windows.h>

worked fine.

AJAX post error : Refused to set unsafe header "Connection"

Remove these two lines:

xmlHttp.setRequestHeader("Content-length", params.length);
xmlHttp.setRequestHeader("Connection", "close");

XMLHttpRequest isn't allowed to set these headers, they are being set automatically by the browser. The reason is that by manipulating these headers you might be able to trick the server into accepting a second request through the same connection, one that wouldn't go through the usual security checks - that would be a security vulnerability in the browser.

TypeError: expected a character buffer object - while trying to save integer to textfile

Have you checked the docstring of write()? It says:

write(str) -> None. Write string str to file.

Note that due to buffering, flush() or close() may be needed before the file on disk reflects the data written.

So you need to convert y to str first.

Also note that the string will be written at the current position which will be at the end of the file, because you'll already have read the old value. Use f.seek(0) to get to the beginning of the file.`

Edit: As for the IOError, this issue seems related. A cite from there:

For the modes where both read and writing (or appending) are allowed (those which include a "+" sign), the stream should be flushed (fflush) or repositioned (fseek, fsetpos, rewind) between either a reading operation followed by a writing operation or a writing operation followed by a reading operation.

So, I suggest you try f.seek(0) and maybe the problem goes away.

JS file gets a net::ERR_ABORTED 404 (Not Found)

As mentionned in comments: you need a way to send your static files to the client. This can be achieved with a reverse proxy like Nginx, or simply using express.static().

Put all your "static" (css, js, images) files in a folder dedicated to it, different from where you put your "views" (html files in your case). I'll call it static for the example. Once it's done, add this line in your server code:

app.use("/static", express.static('./static/'));

This will effectively serve every file in your "static" folder via the /static route.

Querying your index.js file in the client thus becomes:

<script src="static/index.js"></script>

Can I automatically increment the file build version when using Visual Studio?

Go to Project | Properties and then Assembly Information and then Assembly Version and put an * in the last or the second-to-last box (you can't auto-increment the Major or Minor components).

Check orientation on Android phone

A fully way to specify the current orientation of the phone:

public String getRotation(Context context) {
    final int rotation = ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getOrientation();
    switch (rotation) {
        case Surface.ROTATION_0:
            return "portrait";
        case Surface.ROTATION_90:
            return "landscape";
        case Surface.ROTATION_180:
            return "reverse portrait";
        default:
            return "reverse landscape";
    }
}

How do I pass command line arguments to a Node.js program?

Passing,parsing arguments is an easy process. Node provides you with the process.argv property, which is an array of strings, which are the arguments that were used when Node was invoked. The first entry of the array is the Node executable, and the second entry is the name of your script.

If you run script with below atguments

$ node args.js arg1 arg2

File : args.js

console.log(process.argv)

You will get array like

 ['node','args.js','arg1','arg2']

Java 32-bit vs 64-bit compatibility

Unless you have native code (machine code compiled for a specific arcitechture) your code will run equally well in a 32-bit and 64-bit JVM.

Note, however, that due to the larger adresses (32-bit is 4 bytes, 64-bit is 8 bytes) a 64-bit JVM will require more memory than a 32-bit JVM for the same task.

How to get every first element in 2 dimensional list

You can get it like

[ x[0] for x in a]

which will return a list of the first element of each list in a

Fastest way to flatten / un-flatten nested JSON objects

You can try out the package jpflat.

It flattens, inflates, resolves promises, flattens arrays, has customizable path creation and customizable value serialization.

The reducers and serializers receive the whole path as an array of it's parts, so more complex operations can be done to the path instead of modifying a single key or changing the delimiter.

Json path is the default, hence "jp"flat.

https://www.npmjs.com/package/jpflat

let flatFoo = await require('jpflat').flatten(foo)

Finding the 'type' of an input element

To check input type

<!DOCTYPE html>
<html>
<body>

    <input type=number id="txtinp">
    <button onclick=checktype()>Try it</button>

    <script>
        function checktype() 
        {
            alert(document.getElementById("txtinp").type);
        }
    </script>

</body>
</html>

Sanitizing user input before adding it to the DOM in Javascript

You can use this:

function sanitize(string) {
  const map = {
      '&': '&amp;',
      '<': '&lt;',
      '>': '&gt;',
      '"': '&quot;',
      "'": '&#x27;',
      "/": '&#x2F;',
  };
  const reg = /[&<>"'/]/ig;
  return string.replace(reg, (match)=>(map[match]));
}

Also see OWASP XSS Prevention Cheat Sheet.

How to get file name from file path in android

Simple and easy way to get File name

File file = new File("/storage/sdcard0/DCIM/Camera/1414240995236.jpg"); 
String strFileName = file.getName();

After add this code and print strFileName you will get strFileName = 1414240995236.jpg

Regex: Remove lines containing "help", etc

Easy task with grep:

grep -v help filename

Append > newFileName to redirect output to a new file.

Update

To clarify it, the normal behavior will be printing the lines on screen. To pipe it to a file, the > can be used. Thus, in this command:

grep -v help filename > newFileName

grep calls the grep program, obviously
-v is a flag to inverse the output. By defaulf, grep prints the lines that match the given pattern. With this flag, it will print the lines that don't match the pattern.
help is the pattern to match
filename is the name of the input file
> redirects the output to the following item
newFileName the new file where output will be saved.

As you may noticed, you will not be deleting things in your file. grep will read it and another file will be saved, modified accordingly.

using OR and NOT in solr query

Putting together comments from a couple different answers here, in the Solr docs and on the other SO question, I found that the following syntax produces the correct result for my use case

(my_field=my_value or my_field is null):

(my_field:"my_value" OR (*:* NOT my_field:*))

This works for solr 4.1.0. This is slightly different than the use case in the OP; but, I thought that others would find it useful.

c# foreach (property in object)... Is there a simple way of doing this?

Use Reflection to do this

SomeClass A = SomeClass(...)
PropertyInfo[] properties = A.GetType().GetProperties();

Java Array Sort descending?

I don't know what your use case was, however in addition to other answers here another (lazy) option is to still sort in ascending order as you indicate but then iterate in reverse order instead.

Msg 102, Level 15, State 1, Line 1 Incorrect syntax near ' '

For the OP's command:

select compid,2, convert(datetime, '01/01/' + CONVERT(char(4),cal_yr) ,101) ,0,  Update_dt, th1, th2, th3_pc , Update_id, Update_dt,1
from  #tmp_CTF**

I get this error:

Msg 102, Level 15, State 1, Line 2
Incorrect syntax near '*'.

when debugging something like this split the long line up so you'll get a better row number:

select compid
,2
, convert(datetime
, '01/01/' 
+ CONVERT(char(4)
,cal_yr) 
,101) 
,0
,  Update_dt
, th1
, th2
, th3_pc 
, Update_id
, Update_dt
,1
from  #tmp_CTF**

this now results in:

Msg 102, Level 15, State 1, Line 16
Incorrect syntax near '*'.

which is probably just from the OP not putting the entire command in the question, or use [ ] braces to signify the table name:

from [#tmp_CTF**]

if that is the table name.

Bootstrap 4 - Inline List?

.list-inline class in bootstrap is a Inline Unordered List.

If you want to create a horizontal menu using ordered or unordered list you need to place all list items in a single line i.e. side by side. You can do this by simply applying the class

<div class="list-inline">
    <a href="#" class="list-inline-item">First item</a>
    <a href="#" class="list-inline-item">Secound item</a>
    <a href="#" class="list-inline-item">Third item</a>
  </div>

What is the difference between HTML tags and elements?

HTML tag is just opening or closing entity. For example:

<p> and </p> are called HTML tags

HTML element encompasses opening tag, closing tag, content (optional for content-less tags) Eg:

<p>This is the content</p> : This complete thing is called a HTML element

Swift - Split string over multiple lines

Multi-line strings are possible as of Swift 4.0, but there are some rules:

You need to start and end your strings with three double quotes, """.
Your string content should start on its own line.
The terminating """ should also start on its own line.

Other than that, you're good to go! Here's an example:

let longString = """
When you write a string that spans multiple
lines make sure you start its content on a
line all of its own, and end it with three
quotes also on a line of their own.
Multi-line strings also let you write "quote marks"
freely inside your strings, which is great!
"""

See what's new in Swift 4 for more information.

How to track untracked content?

http://progit.org/book/ch6-6.html

I think you should read this to learn a little about submodule. It's well-written, and it doesn't take much time to read it.

"npm config set registry https://registry.npmjs.org/" is not working in windows bat file

You might not be able to change npm registry using .bat file as Gntem pointed out. But I understand that you need the ability to automate changing registries. You can do so by having your .npmrc configs in separate files (say npmrc_jfrog & npmrc_default) and have your .bat files do the copying task.

For example (in Windows): Your default_registry.bat will have

xcopy /y npmrc_default .npmrc

and your jfrog_registry.bat will have

xcopy /y npmrc_jfrog .npmrc

Note: /y suppresses prompting to confirm that you want to overwrite an existing destination file.

This will make sure that all the config properties (registry, proxy, apiKeys, etc.) get copied over to .npmrc.

You can read more about xcopy here.

How to retrieve inserted id after inserting row in SQLite using Python?

You could use cursor.lastrowid (see "Optional DB API Extensions"):

connection=sqlite3.connect(':memory:')
cursor=connection.cursor()
cursor.execute('''CREATE TABLE foo (id integer primary key autoincrement ,
                                    username varchar(50),
                                    password varchar(50))''')
cursor.execute('INSERT INTO foo (username,password) VALUES (?,?)',
               ('test','test'))
print(cursor.lastrowid)
# 1

If two people are inserting at the same time, as long as they are using different cursors, cursor.lastrowid will return the id for the last row that cursor inserted:

cursor.execute('INSERT INTO foo (username,password) VALUES (?,?)',
               ('blah','blah'))

cursor2=connection.cursor()
cursor2.execute('INSERT INTO foo (username,password) VALUES (?,?)',
               ('blah','blah'))

print(cursor2.lastrowid)        
# 3
print(cursor.lastrowid)
# 2

cursor.execute('INSERT INTO foo (id,username,password) VALUES (?,?,?)',
               (100,'blah','blah'))
print(cursor.lastrowid)
# 100

Note that lastrowid returns None when you insert more than one row at a time with executemany:

cursor.executemany('INSERT INTO foo (username,password) VALUES (?,?)',
               (('baz','bar'),('bing','bop')))
print(cursor.lastrowid)
# None

How to git ignore subfolders / subdirectories?

Seems this page still shows up on the top of Google search after so many years...

Modern versions of Git support nesting .gitignore files within a single repo. Just place a .gitignore file in the subdirectory that you want ignored. Use a single asterisk to match everything in that directory:

echo "*" > /path/to/bin/Debug/.gitignore
echo "*" > /path/to/bin/Release/.gitignore

If you've made previous commits, remember to remove previously tracked files:

git rm -rf /path/to/bin/Debug
git rm -rf /path/to/bin/Release

You can confirm it by doing git status to show you all the files removed from tracking.

How to implement a FSM - Finite State Machine in Java

Consider the easy, lightweight Java library EasyFlow. From their docs:

With EasyFlow you can:

implement complex logic but keep your code simple and clean

handle asynchronous calls with ease and elegance

avoid concurrency by using event-driven programming approach

avoid StackOverflow error by avoiding recursion

simplify design, programming and testing of complex java applications

How do I get column names to print in this C# program?

foreach (DataRow row in dt.Rows)
{
    foreach (DataColumn column in dt.Columns)
    {
        ColumnName = column.ColumnName;
        ColumnData = row[column].ToString();
    }
}

Issue with background color in JavaFX 8

Try this one in your css document,

-fx-background-color : #ffaadd;

-fx-base : #ffaadd;

Also, you can set background color on your object with this code directly.

yourPane.setBackground(new Background(new BackgroundFill(Color.DARKGREEN, CornerRadii.EMPTY, Insets.EMPTY)));

Best way to convert pdf files to tiff files

using python this is what I ended up with

    import os
    os.popen(' '.join([
                       self._ghostscriptPath + 'gswin32c.exe', 
                       '-q',
                       '-dNOPAUSE',
                       '-dBATCH',
                       '-r300',
                       '-sDEVICE=tiff12nc',
                       '-sPAPERSIZE=a4',
                       '-sOutputFile=%s %s' % (tifDest, pdfSource),
                       ]))

Facebook development in localhost

The application will run just fine in localhost: 3000, you just need to specify the https address on which the application will be live when it be in production mode.
Option 2 is provide the url or you heroku website which lets you have sample application in production mode.

How can I print a quotation mark in C?

#include<stdio.h>
int main(){
char ch='"';
printf("%c",ch);
return 0;
}

Output: "

module.exports vs exports in Node.js

1.exports -> use as singleton utility
2. module-exports -> use as logical objects such as service , model etc

Excel to CSV with UTF8 encoding

You can use iconv command under Unix (also available on Windows as libiconv).

After saving as CSV under Excel in the command line put:

iconv -f cp1250 -t utf-8 file-encoded-cp1250.csv > file-encoded-utf8.csv

(remember to replace cp1250 with your encoding).

Works fast and great for big files like post codes database, which cannot be imported to GoogleDocs (400.000 cells limit).

Any implementation of Ordered Set in Java?

Take a look at LinkedHashSet class

From Java doc:

Hash table and linked list implementation of the Set interface, with predictable iteration order. This implementation differs from HashSet in that it maintains a doubly-linked list running through all of its entries. This linked list defines the iteration ordering, which is the order in which elements were inserted into the set (insertion-order). Note that insertion order is not affected if an element is re-inserted into the set. (An element e is reinserted into a set s if s.add(e) is invoked when s.contains(e) would return true immediately prior to the invocation.).

Truncate number to two decimal places without rounding

I opted to write this instead to manually remove the remainder with strings so I don't have to deal with the math issues that come with numbers:

num = num.toString(); //If it's not already a String
num = num.slice(0, (num.indexOf("."))+3); //With 3 exposing the hundredths place
Number(num); //If you need it back as a Number

This will give you "15.77" with num = 15.7784514;

MySQL OPTIMIZE all tables?

If you are accessing database directly then you can write following query:

OPTIMIZE TABLE table1,table2,table3,table4......;

Reverse / invert a dictionary mapping

If the values in my_map aren't unique:

inv_map = {}
for k, v in my_map.iteritems():
    inv_map[v] = inv_map.get(v, []) + [k]

Add inline style using Javascript

Using jQuery :

$(nFilter).attr("style","whatever");

Otherwise :

nFilter.setAttribute("style", "whatever");

should work

Export table from database to csv file

In SQL Server Management Studio query window

Select All result set values
Right Click and Select "Save Results As"

Save as CSV file

Determine SQL Server Database Size

The best solution is maybe to calculate the size of each database file, using the sys.sysfiles view, considering a size of 8 KB for each page, as follows:

USE [myDatabase]
GO

SELECT
    [size] * 8
    , [filename]
FROM sysfiles

The [field] column represents the size of the file, in pages (MSDN Reference to sysfiles).

You would see there will be at least two files (MDF and LDF): the sum of these files will give you the correct size of the entire database...

scale Image in an UIButton to AspectFit?

I had the same problem. Just set the ContentMode of the ImageView that is inside the UIButton.

[[self.itemImageButton imageView] setContentMode: UIViewContentModeScaleAspectFit];
[self.itemImageButton setImage:[UIImage imageNamed:stretchImage] forState:UIControlStateNormal];

Hope this helps.

JSON Structure for List of Objects

The first one is invalid syntax. You cannot have object properties inside a plain array. The second one is right although it is not strict JSON. It's a relaxed form of JSON wherein quotes in string keys are omitted.

This tutorial by Patrick Hunlock, may help to learn about JSON and this site may help to validate JSON.

Elegant ways to support equivalence ("equality") in Python classes

You don't have to override both __eq__ and __ne__ you can override only __cmp__ but this will make an implication on the result of ==, !==, < , > and so on.

is tests for object identity. This means a is b will be True in the case when a and b both hold the reference to the same object. In python you always hold a reference to an object in a variable not the actual object, so essentially for a is b to be true the objects in them should be located in the same memory location. How and most importantly why would you go about overriding this behaviour?

Edit: I didn't know __cmp__ was removed from python 3 so avoid it.

Generate an integer sequence in MySQL

There is a way to get a range of values in a single query, but its a bit slow. It can be sped up by using cache tables.

assume you want a select with a range of all BOOLEAN values:

SELECT 0 as b UNION SELECT 1 as b;

we can make a view

CREATE VIEW ViewBoolean AS SELECT 0 as b UNION SELECT 1 as b;

then you can do a Byte by

CREATE VIEW ViewByteValues AS
SELECT b0.b + b1.b*2 + b2.b*4 + b3.b*8 + b4.b*16 + b5.b*32 + b6.b*64 + b7.b*128 as v FROM
ViewBoolean b0,ViewBoolean b1,ViewBoolean b2,ViewBoolean b3,ViewBoolean b4,ViewBoolean b5,ViewBoolean b6,ViewBoolean b7;

then you can do a

CREATE VIEW ViewInt16 AS
SELECT b0.v + b1.v*256 as v FROM
ViewByteValues b0,ViewByteValues b1;

then you can do a

SELECT v+MIN as x FROM ViewInt16 WHERE v<MAX-MIN;

To speed this up I skipped the auto-calculation of byte values and made myself a

CREATE VIEW ViewByteValues AS
SELECT 0 as v UNION SELECT 1 as v UNION SELECT ...
...
...254 as v UNION SELECT 255 as v;

If you need a range of dates you can do.

SELECT DATE_ADD('start_date',v) as day FROM ViewInt16 WHERE v<NumDays;

SELECT DATE_ADD('start_date',v) as day FROM ViewInt16 WHERE day<'end_date';

you might be able to speed this up with the slightly faster MAKEDATE function

SELECT MAKEDATE(start_year,1+v) as day FRON ViewInt16 WHERE day>'start_date' AND day<'end_date';

Please note that this tricks are VERY SLOW and only allow the creation of FINITE sequences in a pre-defined domain (for example int16 = 0...65536 )

I am sure you can modify the queries a bit to speed things up by hinting to MySQL where to stop calculating ;) (using ON clauses instead of WHERE clauses and stuff like that)

For example:

SELECT MIN + (b0.v + b1.v*256 + b2.v*65536 + b3.v*16777216) FROM
ViewByteValues b0,
ViewByteValues b1,
ViewByteValues b2,
ViewByteValues b3
WHERE (b0.v + b1.v*256 + b2.v*65536 + b3.v*16777216) < MAX-MIN;

will keep your SQL server busy for a few hours

However

SELECT MIN + (b0.v + b1.v*256 + b2.v*65536 + b3.v*16777216) FROM
ViewByteValues b0
INNER JOIN ViewByteValues b1 ON (b1.v*256<(MAX-MIN))
INNER JOIN ViewByteValues b2 ON (b2.v*65536<(MAX-MIN))
INNER JOIN ViewByteValues b3 ON (b3.v*16777216<(MAX-MIN)
WHERE (b0.v + b1.v*256 + b2.v*65536 + b3.v*16777216) < (MAX-MIN);

will run reasonably fast - even if MAX-MIN is huge as long as you limit the result with LIMIT 1,30 or something. a COUNT(*) however will take ages and if you make the mistake of adding ORDER BY when MAX-MIN is bigger than say 100k it will again take several seconds to calculate...

SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens on line 102

You didn't bind all your bindings here

$sql = "SELECT SQL_CALC_FOUND_ROWS *, UNIX_TIMESTAMP(publicationDate) AS publicationDate     FROM comments WHERE articleid = :art 
ORDER BY " . mysqli_escape_string($order) . " LIMIT :numRows";

$st = $conn->prepare( $sql );
$st->bindValue( ":art", $art, PDO::PARAM_INT );

You've declared a binding called :numRows but you never actually bind anything to it.

UPDATE 2019: I keep getting upvotes on this and that reminded me of another suggestion

Double quotes are string interpolation in PHP, so if you're going to use variables in a double quotes string, it's pointless to use the concat operator. On the flip side, single quotes are not string interpolation, so if you've only got like one variable at the end of a string it can make sense, or just use it for the whole string.

In fact, there's a micro op available here since the interpreter doesn't care about parsing the string for variables. The boost is nearly unnoticable and totally ignorable on a small scale. However, in a very large application, especially good old legacy monoliths, there can be a noticeable performance increase if strings are used like this. (and IMO, it's easier to read anyway)

Pandas convert dataframe to array of tuples

How about:

subset = data_set[['data_date', 'data_1', 'data_2']]
tuples = [tuple(x) for x in subset.to_numpy()]

for pandas < 0.24 use

tuples = [tuple(x) for x in subset.values]

Simple int to char[] conversion

If you want to convert an int which is in the range 0-9 to a char, you may usually write something like this:

int x;
char c = '0' + x;

Now, if you want a character string, just add a terminating '\0' char:

char s[] = {'0' + x, '\0'};

Note that:

You must be sure that the int is in the 0-9 range, otherwise it will fail,
It works only if character codes for digits are consecutive. This is true in the vast majority of systems, that are ASCII-based, but this is not guaranteed to be true in all cases.

JavaScript displaying a float to 2 decimal places

Don't know how I got to this question, but even if it's many years since this has been asked, I would like to add a quick and simple method I follow and it has never let me down:

var num = response_from_a_function_or_something();

var fixedNum = parseFloat(num).toFixed( 2 );

Validating Phone Numbers Using Javascript

To validate Phone number using regular expression in java script.

In india phone is 10 digit and starting digits are 6,7,8 and 9.

Javascript and HTML code:

_x000D_

function validate()
{
  var text = document.getElementById("pno").value;
  var regx = /^[6-9]\d{9}$/ ;
  if(regx.test(text))
    alert("valid");
  else
    alert("invalid");
}

_x000D_

<html>
    <head>
        <title>JS compiler - knox97</title>
  </head>
  <body>
  <input id="pno" placeholder="phonenumber" type="tel" maxlength="10" > 
    </br></br>
    <button onclick="validate()" type="button">submit</button>
  </body>
</html>

_x000D_

How to convert an Stream into a byte[] in C#?

The shortest solution I know:

using(var memoryStream = new MemoryStream())
{
  sourceStream.CopyTo(memoryStream);
  return memoryStream.ToArray();
}

Git: Remove committed file after push

Reset the file in a correct state, commit, and push again.

If you're sure nobody else has fetched your changes yet, you can use --amend when committing, to modify your previous commit (i.e. rewrite history), and then push. I think you'll have to use the -f option when pushing, to force the push, though.

Sort objects in an array alphabetically on one property of the array

A simple answer:

objArray.sort(function(obj1, obj2) {
   return obj1.DepartmentName > obj2.DepartmentName;
});

ES6 way:

objArray.sort((obj1, obj2) => {return obj1.DepartmentName > obj2.DepartmentName};

If you need to make it lowercase/uppercase etc, just do that and store that result in a variable than compare that variable. Example:

objArray.sort((obj1, obj2) => {
   var firstObj = obj1.toLowerCase();
   var secondObj = obj2.toLowerCase();
   return firstObj.DepartmentName > secondObj.DepartmentName;
});

How to add a bot to a Telegram Group?

You have to use @BotFather, send it command: /setjoingroups There will be dialog like this:

YOU: /setjoingroups

BotFather: Choose a bot to change group membership settings.

YOU: @YourBot

BotFather: 'Enable' - bot can be added to groups. 'Disable' - block group invitations, the bot can't be added to groups. Current status is: DISABLED

YOU: Enable

BotFather: Success! The new status is: ENABLED.

After this you will see button "Add to Group" in your bot's profile.

Python regex for integer?

You are apparently using Django.

You are probably better off just using models.IntegerField() instead of models.TextField(). Not only will it do the check for you, but it will give you the error message translated in several langs, and it will cast the value from it's type in the database to the type in your Python code transparently.

How do I pass parameters to a jar file at the time of execution?

java [ options ] -jar file.jar [ argument ... ]

if you need to pass the log4j properties file use the below option

-Dlog4j.configurationFile=directory/file.xml


java -Dlog4j.configurationFile=directory/file.xml -jar <JAR FILE> [arguments ...]

Delete specific line number(s) from a text file using sed?

This is very often a symptom of an antipattern. The tool which produced the line numbers may well be replaced with one which deletes the lines right away. For example;

grep -nh error logfile | cut -d: -f1 | deletelines logfile

(where deletelines is the utility you are imagining you need) is the same as

grep -v error logfile

Having said that, if you are in a situation where you genuinely need to perform this task, you can generate a simple sed script from the file of line numbers. Humorously (but perhaps slightly confusingly) you can do this with sed.

sed 's%$%d%' linenumbers

This accepts a file of line numbers, one per line, and produces, on standard output, the same line numbers with d appended after each. This is a valid sed script, which we can save to a file, or (on some platforms) pipe to another sed instance:

sed 's%$%d%' linenumbers | sed -f - logfile

On some platforms, sed -f does not understand the option argument - to mean standard input, so you have to redirect the script to a temporary file, and clean it up when you are done, or maybe replace the lone dash with /dev/stdin or /proc/$pid/fd/1 if your OS (or shell) has that.

As always, you can add -i before the -f option to have sed edit the target file in place, instead of producing the result on standard output. On *BSDish platforms (including OSX) you need to supply an explicit argument to -i as well; a common idiom is to supply an empty argument; -i ''.

C# get and set properties for a List Collection

Your setters are strange, which is why you may be seeing a problem.

First, consider whether you even need these setters - if so, they should take a List<string>, not just a string:

set
{
    _subHead = value;
}

These lines:

newSec.subHead.Add("test string");

Are calling the getter and then call Add on the returned List<string> - the setter is not invoked.

how to display progress while loading a url to webview in android?

You will have to over ride onPageStarted and onPageFinished callbacks

mWebView.setWebViewClient(new WebViewClient() {

        public void onPageStarted(WebView view, String url, Bitmap favicon) {
            if (progressBar!= null && progressBar.isShowing()) {
                progressBar.dismiss();
            }
            progressBar = ProgressDialog.show(WebViewActivity.this, "Application Name", "Loading...");
        }

        public boolean shouldOverrideUrlLoading(WebView view, String url) {
            view.loadUrl(url);

            return true;
        }

        public void onPageFinished(WebView view, String url) {
            if (progressBar.isShowing()) {
                progressBar.dismiss();
            }
        }

        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
            alertDialog.setTitle("Error");
            alertDialog.setMessage(description);
            alertDialog.setButton("OK", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int which) {
                    return;
                }
            });
            alertDialog.show();
        }
    });

Put spacing between divs in a horizontal row?

Quite a few ways to apprach this problem.

Use the box-sizing css3 property and simulate the margins with borders.

http://jsfiddle.net/Z7mFr/1/

div.inside {
 width: 25%;
 float:left;
 border-right: 5px solid grey;
 background-color: blue;
 box-sizing:border-box;
 -moz-box-sizing:border-box; /* Firefox */
 -webkit-box-sizing:border-box; /* Safari */
}

<div style="width:100%; height: 200px; background-color: grey;">
 <div class="inside">A</div>
 <div class="inside">B</div>
 <div class="inside">C</div>
 <div class="inside">D</div>
</div>

Reduce the percentage of your elements widths and add some margin-right.

http://jsfiddle.net/mJfz3/

.outer {
 width:100%;
 background:#999;
 overflow:auto;
}

.inside {
 float:left;
 width:24%;
 margin-right:1%;
 background:#333;
}

Can't import org.apache.http.HttpResponse in Android Studio

HttpClient is deprecated in sdk 23.

You have to move on URLConnection or down sdk to 22

Still you need HttpClient with update gradle sdk 23

You have to add the dependencies of HttpClient in app/gradle as

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:23.0.1'

    compile 'org.jbundle.util.osgi.wrapped:org.jbundle.util.osgi.wrapped.org.apache.http.client:4.1.2'
    ...
}

The forked VM terminated without saying properly goodbye. VM crash or System.exit called

Did encounter the same problem as I was trying to compile a maven project set to 1.7 on a windows 10 environment running JAVA = 1.8.

I resolved it by changing the java version from 1.7 to 1.8 as shown below.

 <plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.3</version>
    <configuration>
      <source>1.8</source>
      <target>1.8</target>
    </configuration>
  </plugin>

Sending a JSON to server and retrieving a JSON in return, without JQuery

Sending and receiving data in JSON format using POST method

// Sending and receiving data in JSON format using POST method
//
var xhr = new XMLHttpRequest();
var url = "url";
xhr.open("POST", url, true);
xhr.setRequestHeader("Content-Type", "application/json");
xhr.onreadystatechange = function () {
    if (xhr.readyState === 4 && xhr.status === 200) {
        var json = JSON.parse(xhr.responseText);
        console.log(json.email + ", " + json.password);
    }
};
var data = JSON.stringify({"email": "[email protected]", "password": "101010"});
xhr.send(data);

Sending and receiving data in JSON format using GET method

// Sending a receiving data in JSON format using GET method
//      
var xhr = new XMLHttpRequest();
var url = "url?data=" + encodeURIComponent(JSON.stringify({"email": "[email protected]", "password": "101010"}));
xhr.open("GET", url, true);
xhr.setRequestHeader("Content-Type", "application/json");
xhr.onreadystatechange = function () {
    if (xhr.readyState === 4 && xhr.status === 200) {
        var json = JSON.parse(xhr.responseText);
        console.log(json.email + ", " + json.password);
    }
};
xhr.send();

Handling data in JSON format on the server-side using PHP

<?php
// Handling data in JSON format on the server-side using PHP
//
header("Content-Type: application/json");
// build a PHP variable from JSON sent using POST method
$v = json_decode(stripslashes(file_get_contents("php://input")));
// build a PHP variable from JSON sent using GET method
$v = json_decode(stripslashes($_GET["data"]));
// encode the PHP variable to JSON and send it back on client-side
echo json_encode($v);
?>

The limit of the length of an HTTP Get request is dependent on both the server and the client (browser) used, from 2kB - 8kB. The server should return 414 (Request-URI Too Long) status if an URI is longer than the server can handle.

Note Someone said that I could use state names instead of state values; in other words I could use xhr.readyState === xhr.DONE instead of xhr.readyState === 4 The problem is that Internet Explorer uses different state names so it's better to use state values.

VBA code to set date format for a specific column as "yyyy-mm-dd"

Use the range's NumberFormat property to force the format of the range like this:

Sheet1.Range("A2", "A50000").NumberFormat = "yyyy-mm-dd"

send mail to multiple receiver with HTML mailto

"There are no safe means of assigning multiple recipients to a single mailto: link via HTML. There are safe, non-HTML, ways of assigning multiple recipients from a mailto: link."

http://www.sightspecific.com/~mosh/www_faq/multrec.html

For a quick fix to your problem, change your ; to a comma , and eliminate the spaces between email addresses

<a href='mailto:[email protected],[email protected]'>Email Us</a>

What is the best IDE for PHP?

Are you sure you're looking for an IDE? The features you're describing, along with the impression of being too complicated that you got from e.g. Aptana, suggest that perhaps all you really want is a good editor with syntax highlighting and integration with some common workflow tools. For this, there are tons of options.

I've used jEdit on several platforms successfully, and that alone puts it above most of the rest (many of the IDEs are cross-platform too, but Aptana and anything Eclipse-based is going to be pretty heavy-weight, if full-featured). jEdit has ready-made plugins for everything on your list, and syntax highlighting for a wide range of languages. You can also bring up a shell in the bottom of your window, invoke scripts from within the editor, and so forth. It's not perfect (the UI is better than most Java UIs, but not perfect yet I don't think), but I've had good luck with it, and it'll be a hell of a lot simpler than Aptana/Eclipse.

That said, I do like Aptana quite a bit for web development, it does a lot of the grunt work for you once you're over the learning curve.

Equivalent VB keyword for 'break'

In case you're inside a Sub of Function and you want to exit it, you can use :

Exit Sub

Exit Function

How to easily consume a web service from PHP

I've had great success with wsdl2php. It will automatically create wrapper classes for all objects and methods used in your web service.

Eclipse: Frustration with Java 1.7 (unbound library)

Updated eclipse.ini file with key-value property

-Dosgi.requiredJavaVersion=1.5

-Dosgi.requiredJavaVersion=1.8

because, that is my JAVA version.

Also, selected JRE 1.8 as my project library

How to check if a json key exists?

just before read key check it like before read

JSONObject json_obj=new JSONObject(yourjsonstr);
if(!json_obj.isNull("club"))
{
  //it's contain value to be read operation
}
else
{
  //it's not contain key club or isnull so do this operation here
}

isNull function definition

Returns true if this object has no mapping for name or
if it has a mapping whose value is NULL.

official documentation below link for isNull function

http://developer.android.com/reference/org/json/JSONObject.html#isNull(java.lang.String)

What is a elegant way in Ruby to tell if a variable is a Hash or an Array?

You can just do:

@some_var.class == Hash

or also something like:

@some_var.is_a?(Hash)

It's worth noting that the "is_a?" method is true if the class is anywhere in the objects ancestry tree. for instance:

@some_var.is_a?(Object)  # => true

the above is true if @some_var is an instance of a hash or other class that stems from Object. So, if you want a strict match on the class type, using the == or instance_of? method is probably what you're looking for.

Convert json to a C# array?

Old question but worth adding an answer if using .NET Core 3.0 or later. JSON serialization/deserialization is built into the framework (System.Text.Json), so you don't have to use third party libraries any more. Here's an example based off the top answer given by @Icarus

using System;
using System.Collections.Generic;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            var json = "[{\"Name\":\"John Smith\", \"Age\":35}, {\"Name\":\"Pablo Perez\", \"Age\":34}]";

            // use the built in Json deserializer to convert the string to a list of Person objects
            var people = System.Text.Json.JsonSerializer.Deserialize<List<Person>>(json);

            foreach (var person in people)
            {
                Console.WriteLine(person.Name + " is " + person.Age + " years old.");
            }
        }

        public class Person
        {
            public int Age { get; set; }
            public string Name { get; set; }
        }
    }
}

onCreateOptionsMenu inside Fragments

Your already have the autogenerated file res/menu/menu.xml defining action_settings.

In your MainActivity.java have the following methods:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    switch (id) {
        case R.id.action_settings:
            // do stuff, like showing settings fragment
            return true;
    }

    return super.onOptionsItemSelected(item); // important line
}

In the onCreateView() method of your Fragment call:

setHasOptionsMenu(true);

and also add these 2 methods:

@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.fragment_menu, menu);
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    switch (id) {
        case R.id.action_1:
            // do stuff
            return true;

        case R.id.action_2:
            // do more stuff
            return true;
    }

    return false;
}

Finally, add the new file res/menu/fragment_menu.xml defining action_1 and action_2.

This way when your app displays the Fragment, its menu will contain 3 entries:

action_1 from res/menu/fragment_menu.xml
action_2 from res/menu/fragment_menu.xml
action_settings from res/menu/menu.xml

How can I avoid getting this MySQL error Incorrect column specifier for column COLUMN NAME?

You cannot auto increment the char values. It should be int or long(integers or floating points). Try with this,

CREATE TABLE discussion_topics (
    topic_id int(5) NOT NULL AUTO_INCREMENT,
    project_id char(36) NOT NULL,
    topic_subject VARCHAR(255) NOT NULL,
    topic_content TEXT default NULL,
    date_created DATETIME NOT NULL,
    date_last_post DATETIME NOT NULL,
    created_by_user_id char(36) NOT NULL,
    last_post_user_id char(36) NOT NULL,
    posts_count char(36) default NULL,
    PRIMARY KEY (`topic_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 AUTO_INCREMENT=1;

Hope this helps

npm install errors with Error: ENOENT, chmod

I got a similar error message when trying to npm install a bunch of dependencies. Turns out some of them fail to install on Debian/Ubuntu because they expect /usr/bin/node to be the node executable. To fix, you need do

sudo ln -s nodejs /usr/bin/node

or better yet,

sudo apt-get install nodejs-legacy

For more info: https://stackoverflow.com/a/21171188/7581

How to order by with union in SQL?

Select id,name,age
from
(
   Select id,name,age
   From Student
   Where age < 15
  Union
   Select id,name,age
   From Student
   Where Name like "%a%"
) results
order by name

How to find the largest file in a directory and its subdirectories?

This script simplifies finding largest files for further action. I keep it in my ~/bin directory, and put ~/bin in my $PATH.

#!/usr/bin/env bash
# scriptname: above
# author: Jonathan D. Lettvin, 201401220235

# This finds files of size >= $1 (format ${count}[K|M|G|T], default 10G)
# using a reliable version-independent bash hash to relax find's -size syntax.
# Specifying size using 'T' for Terabytes is supported.
# Output size has units (K|M|G|T) in the left hand output column.

# Example:
#   ubuntu12.04$ above 1T
#   128T /proc/core

# http://stackoverflow.com/questions/1494178/how-to-define-hash-tables-in-bash
# Inspiration for hasch: thanks Adam Katz, Oct 18 2012 00:39
function hasch() { local hasch=`echo "$1" | cksum`; echo "${hasch//[!0-9]}"; }
function usage() { echo "Usage: $0 [{count}{k|K|m|M|g|G|t|T}"; exit 1; }
function arg1() {
    # Translate single arg (if present) into format usable by find.
    count=10; units=G;  # Default find -size argument to 10G.
    size=${count}${units}
    if [ -n "$1" ]; then
        for P in TT tT GG gG MM mM Kk kk; do xlat[`hasch ${P:0:1}`]="${P:1:1}"; done
        units=${xlat[`hasch ${1:(-1)}`]}; count=${1:0:(-1)}
        test -n "$units" || usage
        test -x $(echo "$count" | sed s/[0-9]//g) || usage
        if [ "$units" == "T" ]; then units="G"; let count=$count*1024; fi
        size=${count}${units}
    fi
}
function main() {
    sudo \
        find / -type f -size +$size -exec ls -lh {} \; 2>/dev/null | \
        awk '{ N=$5; fn=$9; for(i=10;i<=NF;i++){fn=fn" "$i};print N " " fn }'
}

arg1 $1
main $size

Auto submit form on page load

Try this On window load submit your form.

window.onload = function(){
  document.forms['member_signup'].submit();
}

How to convert a file into a dictionary?

def get_pair(line):
    key, sep, value = line.strip().partition(" ")
    return int(key), value

with open("file.txt") as fd:    
    d = dict(get_pair(line) for line in fd)

Postgresql - unable to drop database because of some auto connections to DB

If no potential impact on other services on your machine, simply service postgresql restart

Checking if a textbox is empty in Javascript

onchange will work only if the value of the textbox changed compared to the value it had before, so for the first time it won't work because the state didn't change.

So it is better to use onblur event or on submitting the form.

_x000D_

function checkTextField(field) {_x000D_
  document.getElementById("error").innerText =_x000D_
    (field.value === "") ? "Field is empty." : "Field is filled.";_x000D_
}

_x000D_

<input type="text" onblur="checkTextField(this);" />_x000D_
<p id="error"></p>

_x000D_

(Or old live demo.)

postgresql COUNT(DISTINCT ...) very slow

-- My default settings (this is basically a single-session machine, so work_mem is pretty high)
SET effective_cache_size='2048MB';
SET work_mem='16MB';

\echo original
EXPLAIN ANALYZE
SELECT
        COUNT (distinct val) as aantal
FROM one
        ;

\echo group by+count(*)
EXPLAIN ANALYZE
SELECT
        distinct val
       -- , COUNT(*)
FROM one
GROUP BY val;

\echo with CTE
EXPLAIN ANALYZE
WITH agg AS (
    SELECT distinct val
    FROM one
    GROUP BY val
    )
SELECT COUNT (*) as aantal
FROM agg
        ;

Results:

original                                                      QUERY PLAN                                                      
----------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=36448.06..36448.07 rows=1 width=4) (actual time=1766.472..1766.472 rows=1 loops=1)
   ->  Seq Scan on one  (cost=0.00..32698.45 rows=1499845 width=4) (actual time=31.371..185.914 rows=1499845 loops=1)
 Total runtime: 1766.642 ms
(3 rows)

group by+count(*)
                                                         QUERY PLAN                                                         
----------------------------------------------------------------------------------------------------------------------------
 HashAggregate  (cost=36464.31..36477.31 rows=1300 width=4) (actual time=412.470..412.598 rows=1300 loops=1)
   ->  HashAggregate  (cost=36448.06..36461.06 rows=1300 width=4) (actual time=412.066..412.203 rows=1300 loops=1)
         ->  Seq Scan on one  (cost=0.00..32698.45 rows=1499845 width=4) (actual time=26.134..166.846 rows=1499845 loops=1)
 Total runtime: 412.686 ms
(4 rows)

with CTE
                                                             QUERY PLAN                                                             
------------------------------------------------------------------------------------------------------------------------------------
 Aggregate  (cost=36506.56..36506.57 rows=1 width=0) (actual time=408.239..408.239 rows=1 loops=1)
   CTE agg
     ->  HashAggregate  (cost=36464.31..36477.31 rows=1300 width=4) (actual time=407.704..407.847 rows=1300 loops=1)
           ->  HashAggregate  (cost=36448.06..36461.06 rows=1300 width=4) (actual time=407.320..407.467 rows=1300 loops=1)
                 ->  Seq Scan on one  (cost=0.00..32698.45 rows=1499845 width=4) (actual time=24.321..165.256 rows=1499845 loops=1)
       ->  CTE Scan on agg  (cost=0.00..26.00 rows=1300 width=0) (actual time=407.707..408.154 rows=1300 loops=1)
     Total runtime: 408.300 ms
    (7 rows)

The same plan as for the CTE could probably also be produced by other methods (window functions)

Android: ListView elements with multiple clickable buttons

I don't have much experience than above users but I faced this same issue and I Solved this with below Solution

<Button
        android:id="@+id/btnRemove"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_toRightOf="@+id/btnEdit"
        android:layout_weight="1"
        android:background="@drawable/btn"
        android:text="@string/remove" 
        android:onClick="btnRemoveClick"
        />

btnRemoveClick Click event

public void btnRemoveClick(View v)
{
    final int position = listviewItem.getPositionForView((View) v.getParent()); 
    listItem.remove(position);
    ItemAdapter.notifyDataSetChanged();

}

Index was out of range. Must be non-negative and less than the size of the collection parameter name:index

This error is caused when you have enabled paging in Grid view. If you want to delete a record from grid then you have to do something like this.

int index = Convert.ToInt32(e.CommandArgument);
int i = index % 20;
// Here 20 is my GridView's Page Size.
GridViewRow row = gvMainGrid.Rows[i];
int id = Convert.ToInt32(gvMainGrid.DataKeys[i].Value);
new GetData().DeleteRecord(id);
GridView1.DataSource = RefreshGrid();
GridView1.DataBind();

Hope this answers the question.

Java/Groovy - simple date reformatting

oldDate is not in the format of the SimpleDateFormat you are using to parse it.

Try this format: dd-MMM-yyyy - It matches what you're trying to parse.

Missing maven .m2 folder

If I'm right, it's just because you are missing the cd command. Try c:\Users\Jonathan\cd .m2/.

What is the default maximum heap size for Sun's JVM from Java SE 6?

To answer this question it's critical whether the Java VM is in CLIENT or SERVER mode. You can specify "-client" or "-server" options. Otherwise java uses internal rules; basically win32 is always client and Linux is always server, but see the table here:

http://docs.oracle.com/javase/6/docs/technotes/guides/vm/server-class.html

Sun/Oracle jre6u18 doc says re client: the VM gets 1/2 of physical memory if machine has <= 192MB; 1/4 of memory if machine has <= 1Gb; max 256Mb. In my test on a 32bit WindowsXP system with 2Gb phys mem, Java allocated 256Mb, which agrees with the doc.

Sun/Oracle jre6u18 doc says re server: same as client, then adds confusing language: for 32bit JVM the default max is 1Gb, and for 64 bit JVM the default is 32Gb. In my test on a 64bit linux machine with 8Gb physical, Java allocates 2Gb, which is 1/4 of physical; on a 64bit linux machine with 128Gb physical Java allocates 32Gb, again 1/4 of physical.

Thanks to this SO post for guiding me:

Definition of server-class machine changed recently?

How to replace string in Groovy

You need to escape the backslash \:

println yourString.replace("\\", "/")

Changing the URL in react-router v4 without using Redirect or Link

I'm using this to redirect with React Router v4:

this.props.history.push('/foo');

Hope it work for you ;)

how to hide a vertical scroll bar when not needed

Add this class in .css class

.scrol  { 
font: bold 14px Arial; 
border:1px solid black; 
width:100% ; 
color:#616D7E; 
height:20px; 
overflow:scroll; 
overflow-y:scroll;
overflow-x:hidden;
}

and use the class in div. like here.

<div> <p class = "scrol" id = "title">-</p></div>

I have attached image , you see the out put of the above code enter image description here

CodeIgniter Disallowed Key Characters

To use CodeIgniter with jQuery Ajax, use "Object" as data instead of Query string as below:

$.ajax({
    url: site_url + "ajax/signup",
    data: ({'email': email, 'password': password}), //<--- Use Object
    type: "post",
    success: function(response, textStatus, jqXHR){
        $('#sign-up').html(response);
    },
    error: function(jqXHR, textStatus, errorThrown){
        console.log("The following error occured: "+
                    textStatus, errorThrown);
    }
});

Recommendation for compressing JPG files with ImageMagick

Here's a complete solution for those using Imagick in PHP:

$im = new \Imagick($filePath);
$im->setImageCompression(\Imagick::COMPRESSION_JPEG);
$im->setImageCompressionQuality(85);
$im->stripImage();
$im->setInterlaceScheme(\Imagick::INTERLACE_PLANE);

// Try between 0 or 5 radius. If you find radius of 5 
// produces too blurry  pictures decrease to 0 until you 
// find a good balance between size and quality. 
$im->gaussianBlurImage(0.05, 5);



// Include this part if you also want to specify a maximum size for the images

$size = $im->getImageGeometry();
$maxWidth = 1920;
$maxHeight = 1080;


// ----------
// |        |
// ----------
if($size['width'] >= $size['height']){
  if($size['width'] > $maxWidth){
    $im->resizeImage($maxWidth, 0, \Imagick::FILTER_LANCZOS, 1);
  }
}


// ------
// |    |
// |    |
// |    |
// |    |
// ------
else{
  if($size['height'] > $maxHeight){
    $im->resizeImage(0, $maxHeight, \Imagick::FILTER_LANCZOS, 1);
  }
}

Angular cookies

It is also beneficial to store data into sessionStorage

// Save data to sessionStorage
sessionStorage.setItem('key', 'value');

// Get saved data from sessionStorage
var data = sessionStorage.getItem('key');

// Remove saved data from sessionStorage
sessionStorage.removeItem('key');

// Remove all saved data from sessionStorage
sessionStorage.clear();

for details https://developer.mozilla.org/en-US/docs/Web/API/Window/sessionStorage

How to define object in array in Mongoose schema correctly with 2d geo index

I had a similar issue with mongoose :

fields: 
    [ '[object Object]',
     '[object Object]',
     '[object Object]',
     '[object Object]' ] }

In fact, I was using "type" as a property name in my schema :

fields: [
    {
      name: String,
      type: {
        type: String
      },
      registrationEnabled: Boolean,
      checkinEnabled: Boolean
    }
  ]

To avoid that behavior, you have to change the parameter to :

fields: [
    {
      name: String,
      type: {
        type: { type: String }
      },
      registrationEnabled: Boolean,
      checkinEnabled: Boolean
    }
  ]

WPF Check box: Check changed handling

What about the Checked event? Combine that with AttachedCommandBehaviors or something similar, and a DelegateCommand to get a function fired in your viewmodel everytime that event is called.

smtp configuration for php mail

PHP's mail() function does not have support for SMTP. You're going to need to use something like the PEAR Mail package.

Here is a sample SMTP mail script:

<?php
require_once("Mail.php");

$from = "Your Name <[email protected]>";
$to = "Their Name <[email protected]>";
$subject = "Subject";
$body = "Lorem ipsum dolor sit amet, consectetur adipiscing elit...";

$host = "mailserver.blahblah.com";
$username = "smtp_username";
$password = "smtp_password";

$headers = array('From' => $from, 'To' => $to, 'Subject' => $subject);

$smtp = Mail::factory('smtp', array ('host' => $host,
                                     'auth' => true,
                                     'username' => $username,
                                     'password' => $password));

$mail = $smtp->send($to, $headers, $body);

if ( PEAR::isError($mail) ) {
    echo("<p>Error sending mail:<br/>" . $mail->getMessage() . "</p>");
} else {
    echo("<p>Message sent.</p>");
}
?>

Which comment style should I use in batch files?

A very detailed and analytic discussion on the topic is available on THIS page

It has the example codes and the pros/cons of different options.

How to check whether an object has certain method/property?

Wouldn't it be better to not use any dynamic types for this, and let your class implement an interface. Then, you can check at runtime wether an object implements that interface, and thus, has the expected method (or property).

public interface IMyInterface
{
   void Somemethod();
}


IMyInterface x = anyObject as IMyInterface;
if( x != null )
{
   x.Somemethod();
}

I think this is the only correct way.

The thing you're referring to is duck-typing, which is useful in scenarios where you already know that the object has the method, but the compiler cannot check for that. This is useful in COM interop scenarios for instance. (check this article)

If you want to combine duck-typing with reflection for instance, then I think you're missing the goal of duck-typing.

Detect Android phone via Javascript / jQuery

How about this one-liner?

var isAndroid = /(android)/i.test(navigator.userAgent);

The i modifier is used to perform case-insensitive matching.

Technique taken from Cordova AdMob test project: https://github.com/floatinghotpot/cordova-admob-pro/wiki/00.-How-To-Use-with-PhoneGap-Build

Pandas read_csv low_memory and dtype options

Try:

dashboard_df = pd.read_csv(p_file, sep=',', error_bad_lines=False, index_col=False, dtype='unicode')

According to the pandas documentation:

dtype : Type name or dict of column -> type

As for low_memory, it's True by default and isn't yet documented. I don't think its relevant though. The error message is generic, so you shouldn't need to mess with low_memory anyway. Hope this helps and let me know if you have further problems

How do I convert special UTF-8 chars to their iso-8859-1 equivalent using javascript?

you should add this line above your page

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

How to alter a column's data type in a PostgreSQL table?

Cool @derek-kromm, Your answer is accepted and correct, But I am wondering if we need to alter more than the column. Here is how we can do.

ALTER TABLE tbl_name 
ALTER COLUMN col_name TYPE varchar (11), 
ALTER COLUMN col_name2 TYPE varchar (11),
ALTER COLUMN col_name3 TYPE varchar (11);

Documentation

Cheers!! Read Simple Write Simple

What is the syntax for adding an element to a scala.collection.mutable.Map?

Create a mutable map without initial value:

scala> var d= collection.mutable.Map[Any, Any]()
d: scala.collection.mutable.Map[Any,Any] = Map()

Create a mutable map with initial values:

scala> var d= collection.mutable.Map[Any, Any]("a"->3,1->234,2->"test")
d: scala.collection.mutable.Map[Any,Any] = Map(2 -> test, a -> 3, 1 -> 234)

Update existing key-value:

scala> d("a")= "ABC"

Add new key-value:

scala> d(100)= "new element"

Check the updated map:

scala> d
res123: scala.collection.mutable.Map[Any,Any] = Map(2 -> test, 100 -> new element, a -> ABC, 1 -> 234)

Prevent WebView from displaying "web page not available"

Check out the discussion at Android WebView onReceivedError(). It's quite long, but the consensus seems to be that a) you can't stop the "web page not available" page appearing, but b) you could always load an empty page after you get an onReceivedError

How to install Hibernate Tools in Eclipse?

Since it is for Ganymede (eclipse 3.4), I would advise to uncompress the zip in the dropins in the HibernateTools-3.2.4.Beta1-R20081031133 directory created after the name of the archive.

Once it is done, create in the [eclipse\dropins\HibernateTools-3.2.4.Beta1-R20081031133] an 'eclipse' directory, in which you will move the plugins and features directories creating at the extraction of the files of the archive.

Add a .exclipseextension in [eclipse\dropins\HibernateTools-3.2.4.Beta1-R20081031133\eclipse]:

name=QuickRex
id=org.hibernate.eclipse
version=3.2.4b1

So:

eclipse
    dropins
         HibernateTools-3.2.4.Beta1-R20081031133
             eclipse
                 .eclipseextension
                 features
                 plugins

Relaunch eclipse and the plugin Hibernate should be detected.

If you install another eclipse, just copy the content of your dropins directory to the new eclipse\dropins and your set of plugins will be detected again.

How do I detect if I am in release or debug mode?

Try the following:

boolean isDebuggable =  ( 0 != ( getApplicationInfo().flags & ApplicationInfo.FLAG_DEBUGGABLE ) );

Kotlin:

val isDebuggable = 0 != applicationInfo.flags and ApplicationInfo.FLAG_DEBUGGABLE

It is taken from bundells post from here

'tuple' object does not support item assignment

You have misspelt the second pixels as pixel. The following works:

pixels = [1,2,3]
pixels[0] = 5

It appears that due to the typo you were trying to accidentally modify some tuple called pixel, and in Python tuples are immutable. Hence the confusing error message.

Could not load file or assembly ... The parameter is incorrect

Just clear this folder: (only windows x64)

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files

Common sources of unterminated string literal

The web page developer guessed wrong about which encoding is used by the viewer's browser. This can usually be solved by specifying an encoding in the page's header.

Upgrading React version and it's dependencies by reading package.json

Use this command to update react npm install --save [email protected] Don't forget to change 16.12.0 to the latest version or the version you need to setup.

What's the easy way to auto create non existing dir in ansible

you can create the folder using the following depending on your ansible version.

Latest version 2<

- name: Create Folder
  file: 
   path: "{{project_root}}/conf"
   recurse: yes
   state: directory

Older version:

- name: Create Folder
  file: 
      path="{{project_root}}/conf"
      recurse: yes
      state=directory

Refer - http://docs.ansible.com/ansible/latest/file_module.html

Finding what branch a Git commit came from

I think someone should face the same problem that can't find out the branch, although it actually exists in one branch.

You'd better pull all first:

git pull --all

Then do the branch search:

git name-rev <SHA>

or:

git branch --contains <SHA>

Neither BindingResult nor plain target object for bean name available as request attribute

I had a similar problem in IntelliJ IDEA. My code was 100% correct, but after starting the Tomcat, you receive an exception. java.lang.IllegalStateException: Neither BindingResult

I just removed and added again Tomcat configuration. And it worked for me.

A picture Tomcat configuration

How to grep a string in a directory and all its subdirectories?

If your grep supports -R, do:

grep -R 'string' dir/

If not, then use find:

find dir/ -type f -exec grep -H 'string' {} +

How do you add Boost libraries in CMakeLists.txt?

Adapting @LainIwakura's answer for modern CMake syntax with imported targets, this would be:

set(Boost_USE_STATIC_LIBS OFF) 
set(Boost_USE_MULTITHREADED ON)  
set(Boost_USE_STATIC_RUNTIME OFF) 
find_package(Boost 1.45.0 COMPONENTS filesystem regex) 

if(Boost_FOUND)
    add_executable(progname file1.cxx file2.cxx) 
    target_link_libraries(progname Boost::filesystem Boost::regex)
endif()

Note that it is not necessary anymore to specify the include directories manually, since it is already taken care of through the imported targets Boost::filesystem and Boost::regex.
regex and filesystem can be replaced by any boost libraries you need.

I get a "An attempt was made to load a program with an incorrect format" error on a SQL Server replication project

in windows form application I do this, Right-click on Project->Properties->Build->Check Prefer 32-bit checkbox. Thanks all

bitwise XOR of hex numbers in python

here's a better function

def strxor(a, b):     # xor two strings of different lengths
    if len(a) > len(b):
        return "".join([chr(ord(x) ^ ord(y)) for (x, y) in zip(a[:len(b)], b)])
    else:
        return "".join([chr(ord(x) ^ ord(y)) for (x, y) in zip(a, b[:len(a)])])

How to avoid "cannot load such file -- utils/popen" from homebrew on OSX

The problem mainly occurs after updating OS X to El Capitan (OS X 10.11) or macOS Sierra (macOS 10.12).

This is because of file permission issues with El Capitan’s or later macOS's new SIP process. Try changing the permissions for the /usr/local directory:

$ sudo chown -R $(whoami):admin /usr/local

If it still doesn't work, use these steps inside a terminal session and everything will be fine:

cd /usr/local/Library/Homebrew  
git reset --hard  
git clean -df
brew update

This may be because homebrew is not updated.

disable past dates on datepicker

Try this'
 <link rel="stylesheet" href="//code.jquery.com/ui/1.12.0/themes/base/jquery-ui.css">
    <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
    <script src="https://code.jquery.com/ui/1.12.0/jquery-ui.js"></script>

    <!-- table -->
    <link rel="stylesheet" href="https://cdn.datatables.net/1.10.12/css/dataTables.bootstrap.min.css">
    <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js"></script>
    <script src="https://cdn.datatables.net/1.10.12/js/dataTables.bootstrap.min.js"></script>
    <!-- end table -->

    <script>
       $(function() {
        $('#example').DataTable();
        $("#from_date").datepicker({
            dateFormat: "mm/d/yy",
            maxDate: 0,

            onSelect: function () {



                var minDate = $(this).datepicker('getDate');

                $('#to_date').datepicker('setDate', minDate);
                $('#to_date').datepicker('option', 'maxDate', 0);
                $('#to_date').datepicker('option', 'minDate', minDate);
            }
        });
        $('#to_date').datepicker({
            dateFormat: "mm/d/yy"
        });

       });
       </script><link rel="stylesheet" href="//code.jquery.com/ui/1.12.0/themes/base/jquery-ui.css">
    <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
    <script src="https://code.jquery.com/ui/1.12.0/jquery-ui.js"></script>

    <!-- table -->
    <link rel="stylesheet" href="https://cdn.datatables.net/1.10.12/css/dataTables.bootstrap.min.css">
    <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js"></script>
    <script src="https://cdn.datatables.net/1.10.12/js/dataTables.bootstrap.min.js"></script>
    <!-- end table -->

    <script>
       $(function() {
        $('#example').DataTable();
        $("#from_date").datepicker({
            dateFormat: "mm/d/yy",
            maxDate: 0,

            onSelect: function () {



                var minDate = $(this).datepicker('getDate');

                $('#to_date').datepicker('setDate', minDate);
                $('#to_date').datepicker('option', 'maxDate', 0);
                $('#to_date').datepicker('option', 'minDate', minDate);
            }
        });
        $('#to_date').datepicker({
            dateFormat: "mm/d/yy"
        });

       });
       </script><link rel="stylesheet" href="//code.jquery.com/ui/1.12.0/themes/base/jquery-ui.css">
    <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
    <script src="https://code.jquery.com/ui/1.12.0/jquery-ui.js"></script>

    <!-- table -->
    <link rel="stylesheet" href="https://cdn.datatables.net/1.10.12/css/dataTables.bootstrap.min.css">
    <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js"></script>
    <script src="https://cdn.datatables.net/1.10.12/js/dataTables.bootstrap.min.js"></script>
    <!-- end table -->

    <script>
       $(function() {
        $('#example').DataTable();
        $("#from_date").datepicker({
            dateFormat: "mm/d/yy",
            maxDate: 0,

            onSelect: function () {



                var minDate = $(this).datepicker('getDate');

                $('#to_date').datepicker('setDate', minDate);
                $('#to_date').datepicker('option', 'maxDate', 0);
                $('#to_date').datepicker('option', 'minDate', minDate);
            }
        });
        $('#to_date').datepicker({
            dateFormat: "mm/d/yy"
        });

       });
       </script><link rel="stylesheet" href="//code.jquery.com/ui/1.12.0/themes/base/jquery-ui.css">
    <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
    <script src="https://code.jquery.com/ui/1.12.0/jquery-ui.js"></script>

    <!-- table -->
    <link rel="stylesheet" href="https://cdn.datatables.net/1.10.12/css/dataTables.bootstrap.min.css">
    <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js"></script>
    <script src="https://cdn.datatables.net/1.10.12/js/dataTables.bootstrap.min.js"></script>
    <!-- end table -->

    <script>
       $(function() {
        $('#example').DataTable();
        $("#from_date").datepicker({
            dateFormat: "mm/d/yy",
            maxDate: 0,

            onSelect: function () {



                var minDate = $(this).datepicker('getDate');

                $('#to_date').datepicker('setDate', minDate);
                $('#to_date').datepicker('option', 'maxDate', 0);
                $('#to_date').datepicker('option', 'minDate', minDate);
            }
        });
        $('#to_date').datepicker({
            dateFormat: "mm/d/yy"
        });

       });
       </script><link rel="stylesheet" href="//code.jquery.com/ui/1.12.0/themes/base/jquery-ui.css">
    <script src="https://code.jquery.com/jquery-1.12.4.js"></script>
    <script src="https://code.jquery.com/ui/1.12.0/jquery-ui.js"></script>

    <!-- table -->
    <link rel="stylesheet" href="https://cdn.datatables.net/1.10.12/css/dataTables.bootstrap.min.css">
    <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://cdn.datatables.net/1.10.12/js/jquery.dataTables.min.js"></script>
    <script src="https://cdn.datatables.net/1.10.12/js/dataTables.bootstrap.min.js"></script>
    <!-- end table -->

    <script>
       $(function() {
        $('#example').DataTable();
        $("#from_date").datepicker({
            dateFormat: "mm/d/yy",
            maxDate: 0,

            onSelect: function () {



                var minDate = $(this).datepicker('getDate');

                $('#to_date').datepicker('setDate', minDate);
                $('#to_date').datepicker('option', 'maxDate', 0);
                $('#to_date').datepicker('option', 'minDate', minDate);
            }
        });
        $('#to_date').datepicker({
            dateFormat: "mm/d/yy"
        });

       });
       </script>

How to build query string with Javascript

As Stein says, you can use the prototype javascript library from http://www.prototypejs.org. Include the JS and it is very simple then, $('formName').serialize() will return what you want!

HTML tag <a> want to add both href and onclick working

You already have what you need, with a minor syntax change:

<a href="www.mysite.com" onclick="return theFunction();">Item</a>

<script type="text/javascript">
    function theFunction () {
        // return true or false, depending on whether you want to allow the `href` property to follow through or not
    }
</script>

The default behavior of the <a> tag's onclick and href properties is to execute the onclick, then follow the href as long as the onclick doesn't return false, canceling the event (or the event hasn't been prevented)

Find empty or NaN entry in Pandas Dataframe

To obtain all the rows that contains an empty cell in in a particular column.

DF_new_row=DF_raw.loc[DF_raw['columnname']=='']

This will give the subset of DF_raw, which satisfy the checking condition.

Sleep function in Windows, using C

Include the following function at the start of your code, whenever you want to busy wait. This is distinct from sleep, because the process will be utilizing 100% cpu while this function is running.

void sleep(unsigned int mseconds)
{
    clock_t goal = mseconds + clock();
    while (goal > clock())
        ;
}

Note that the name sleep for this function is misleading, since the CPU will not be sleeping at all.

Transfer files to/from session I'm logged in with PuTTY

You can also download psftp.exe from:

http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html

When you run it you type:

open "server name"

Then:

put "file name"

(Type help to get a full list of commands.)

You can also type get <file name> to download files from a remote machine to the local machine.

Load image from resources

ResourceManager will work if your image is in a resource file. If it is just a file in your project (let's say the root) you can get it using something like this:

System.Reflection.Assembly assembly = System.Reflection.Assembly.GetExecutingAssembly();
System.IO.Stream file = assembly .GetManifestResourceStream("AssemblyName." + channel);
this.pictureBox1.Image = Image.FromStream(file);

Or if you're in WPF:

    private ImageSource GetImage(string channel)
    {
        StreamResourceInfo sri = Application.GetResourceStream(new Uri("/TestApp;component/" + channel, UriKind.Relative));
        BitmapImage bmp = new BitmapImage();
        bmp.BeginInit();
        bmp.StreamSource = sri.Stream;
        bmp.EndInit();

        return bmp;
    }

In Python, how do I read the exif data for an image?

Here's the one that may be little easier to read. Hope this is helpful.

from PIL import Image
from PIL import ExifTags

exifData = {}
img = Image.open(picture.jpg)
exifDataRaw = img._getexif()
for tag, value in exifDataRaw.items():
    decodedTag = ExifTags.TAGS.get(tag, tag)
    exifData[decodedTag] = value

Detect merged cells in VBA Excel with MergeArea

While working with selected cells as shown by @tbur can be useful, it's also not the only option available.

You can use Range() like so:

If Worksheets("Sheet1").Range("A1").MergeCells Then
  Do something
Else
  Do something else
End If

Or:

If Worksheets("Sheet1").Range("A1:C1").MergeCells Then
  Do something
Else
  Do something else
End If

Alternately, you can use Cells():

If Worksheets("Sheet1").Cells(1, 1).MergeCells Then
  Do something
Else
  Do something else
End If

Adding value to input field with jQuery

You have to escape [ and ]. Try this:

$('.button').click(function(){
    var fieldID = $(this).prev().attr("id");
    fieldID = fieldID.replace(/([\[\]]+)/g, "\\$1");
    $('#' + fieldID).val("hello world");
});

Demo: http://jsfiddle.net/7RJtf/1/

Push eclipse project to GitHub with EGit

Simple Steps:

-Open Eclipse.

Select Project which you want to push on github->rightclick.
select Team->share Project->Git->Create repository->finish.(it will ask to login in Git account(popup).
Right click again to Project->Team->commit. you are done

Makefile ifeq logical or

I don't think there's a concise, sensible way to do that, but there are verbose, sensible ways (such as Foo Bah's) and concise, pathological ways, such as

ifneq (,$(findstring $(GCC_MINOR),4-5))
    CFLAGS += -fno-strict-overflow
endif

(which will execute the command provided that the string $(GCC_MINOR) appears inside the string 4-5).

Html.RenderPartial() syntax with Razor

If you are given this format it takes like a link to another page or another link.partial view majorly used for renduring the html files from one place to another.

How to determine if object is in array

I used underscore javascript library to tweak this issue.

function containsObject(obj, list) {
 var res = _.find(list, function(val){ return _.isEqual(obj, val)});
 return (_.isObject(res))? true:false;
}

please refer to underscore.js documentation for the underscore functions used in the above example.

note: This is not a pure javascript solution. Shared for educational purposes.

How to install PyQt4 in anaconda?

Successfully installed it on OSX using homebrew:

brew install sip
brew install pyqt

which (currently) installs PyQt4. Anaconda is the main python on the machine (OSX 10.8.5).

TypeError: 'builtin_function_or_method' object is not subscriptable

Mad a similar error, easy to fix:

    TypeError Traceback (most recent call last) <ipython-input-2-1eb12bfdc7db> in <module>
  3 mylist = [10,20,30] ----> 4 arr = np.array[(10,20,30)] 5 d = {'a':10, 'b':20, 'c':30} TypeError: 'builtin_function_or_method' object is not subscriptable

but I should have written it as:

arr = np.array([10,20,30])

Very fixable, rookie/dumb mistake.

How to add link to flash banner

If you have a flash FLA file that shows the FLV movie you can add a button inside the FLA file. This button can be given an action to load the URL.

on (release) {
  getURL("http://someurl/");
}

To make the button transparent you can place a square inside it that is moved to the hit-area frame of the button.

I think it would go too far to explain into depth with pictures how to go about in stackoverflow.

How to check 'undefined' value in jQuery

If you have names of the element and not id we can achieve the undefined check on all text elements (for example) as below and fill them with a default value say 0.0:

var aFieldsCannotBeNull=['ast_chkacc_bwr','ast_savacc_bwr'];
 jQuery.each(aFieldsCannotBeNull,function(nShowIndex,sShowKey) {
   var $_oField = jQuery("input[name='"+sShowKey+"']");
   if($_oField.val().trim().length === 0){
       $_oField.val('0.0')
    }
  })

How do I use reflection to call a generic method?

With C# 4.0, reflection isn't necessary as the DLR can call it using runtime types. Since using the DLR library is kind of a pain dynamically (instead of the C# compiler generating code for you), the open source framework Dynamitey (.net standard 1.5) gives you easy cached run-time access to the same calls the compiler would generate for you.

var name = InvokeMemberName.Create;
Dynamic.InvokeMemberAction(this, name("GenericMethod", new[]{myType}));


var staticContext = InvokeContext.CreateStatic;
Dynamic.InvokeMemberAction(staticContext(typeof(Sample)), name("StaticMethod", new[]{myType}));

Change background of LinearLayout in Android

If you want to set through xml using android's default color codes, then you need to do as below:

android:background="@android:color/white"

If you have colors specified in your project's colors.xml, then use:

android:background="@color/white"

If you want to do programmatically, then do:

linearlayout.setBackgroundColor(Color.WHITE);

Angular 2: Get Values of Multiple Checked Checkboxes

Here's a simple way using ngModel (final Angular 2)

<!-- my.component.html -->

<div class="form-group">
    <label for="options">Options:</label>
    <div *ngFor="let option of options">
        <label>
            <input type="checkbox"
                   name="options"
                   value="{{option.value}}"
                   [(ngModel)]="option.checked"/>
            {{option.name}}
        </label>
    </div>
</div>

// my.component.ts

@Component({ moduleId:module.id, templateUrl:'my.component.html'})

export class MyComponent {
  options = [
    {name:'OptionA', value:'1', checked:true},
    {name:'OptionB', value:'2', checked:false},
    {name:'OptionC', value:'3', checked:true}
  ]

  get selectedOptions() { // right now: ['1','3']
    return this.options
              .filter(opt => opt.checked)
              .map(opt => opt.value)
  }
}

Return value in SQL Server stored procedure

I can recommend make pre-init of future index value, this is very usefull in a lot of case like multi work, some export e.t.c.

just create additional User_Seq table: with two fields: id Uniq index and SeqVal nvarchar(1)

and create next SP, and generated ID value from this SP and put to new User row!

CREATE procedure [dbo].[User_NextValue]
as
begin
    set NOCOUNT ON


    declare @existingId int = (select isnull(max(UserId)+1, 0)  from dbo.User)

    insert into User_Seq (SeqVal) values ('a')
    declare @NewSeqValue int = scope_identity()     

    if @existingId > @NewSeqValue 
    begin  

        set identity_insert User_Seq  on
        insert into User_Seq (SeqID) values (@existingId)     
        set @NewSeqValue = scope_identity()     
    end

    delete from User_Seq WITH (READPAST)

return @NewSeqValue

end

What's wrong with foreign keys?

I have heard this argument too - from people who forgot to put an index on their foreign keys and then complained that certain operations were slow (because constraint checking could take advantage of any index). So to sum up: There is no good reason not to use foreign keys. All modern databases support cascaded deletes, so...

Bitwise and in place of modulus operator

Using bitwise_and, bitwise_or, and bitwise_not you can modify any bit configurations to another bit configurations (i.e. these set of operators are "functionally complete"). However, for operations like modulus, the general formula would be necessarily be quite complicated, I wouldn't even bother trying to recreate it.

Datetime in where clause

Assuming we're talking SQL Server DateTime

Note: BETWEEN includes both ends of the range, so technically this pattern will be wrong:

errorDate BETWEEN '12/20/2008' AND '12/21/2008'

My preferred method for a time range like that is:

'20081220' <= errorDate AND errordate < '20081221'

Works with common indexes (range scan, SARGable, functionless) and correctly clips off midnight of the next day, without relying on SQL Server's time granularity (e.g. 23:59:59.997)

Oracle - How to create a materialized view with FAST REFRESH and JOINS

You will get the error on REFRESH_FAST, if you do not create materialized view logs for the master table(s) the query is referring to. If anyone is not familiar with materialized views or using it for the first time, the better way is to use oracle sqldeveloper and graphically put in the options, and the errors also provide much better sense.

What arguments are passed into AsyncTask<arg1, arg2, arg3>?

Refer to following links:

You cannot pass more than three arguments, if you want to pass only 1 argument then use void for the other two arguments.

1. private class DownloadFilesTask extends AsyncTask<URL, Integer, Long> 


2. protected class InitTask extends AsyncTask<Context, Integer, Integer>

An asynchronous task is defined by a computation that runs on a background thread and whose result is published on the UI thread. An asynchronous task is defined by 3 generic types, called Params, Progress and Result, and 4 steps, called onPreExecute, doInBackground, onProgressUpdate and onPostExecute.

KPBird

Android - implementing startForeground for a service?

This is my code to set the service to foreground:

private void runAsForeground(){
    Intent notificationIntent = new Intent(this, RecorderMainActivity.class);
    PendingIntent pendingIntent=PendingIntent.getActivity(this, 0,
            notificationIntent, Intent.FLAG_ACTIVITY_NEW_TASK);

    Notification notification=new NotificationCompat.Builder(this)
                                .setSmallIcon(R.drawable.ic_launcher)
                                .setContentText(getString(R.string.isRecording))
                                .setContentIntent(pendingIntent).build();

    startForeground(NOTIFICATION_ID, notification);

}

I need to build a notification using PendingIntent, so that I can start my main activity from the notification.

To remove the notification, just call the stopForeground(true);

It is called in the onStartCommand(). Please refer to my code at : https://github.com/bearstand/greyparrot/blob/master/src/com/xiong/richard/greyparrot/Mp3Recorder.java

.htaccess rewrite to redirect root URL to subdirectory

Another alternative if you want to rewrite the URL and hide the original URL:

RewriteEngine on
RewriteRule ^(.*)$ /store/$1 [L]

With this, if you for example type http://www.example.com/product.php?id=4, it will transparently open the file at http://www.example.com/store/product.php?id=4 but without showing to the user the full url.

SyntaxError: missing ; before statement

Looks like you have an extra parenthesis.

The following portion is parsed as an assignment so the interpreter/compiler will look for a semi-colon or attempt to insert one if certain conditions are met.

foob_name = $this.attr('name').replace(/\[(\d+)\]/, function($0, $1) {
   return '[' + (+$1 + 1) + ']';
})

How to a convert a date to a number and back again in MATLAB

Use DATESTR

>> datestr(40189)
ans =
12-Jan-0110

Unfortunately, Excel starts counting at 1-Jan-1900. Find out how to convert serial dates from Matlab to Excel by using DATENUM

>> datenum(2010,1,11)
ans =
      734149
>> datenum(2010,1,11)-40189
ans =
      693960
>> datestr(40189+693960)
ans =
11-Jan-2010

In other words, to convert any serial Excel date, call

datestr(excelSerialDate + 693960)

EDIT

To get the date in mm/dd/yyyy format, call datestr with the specified format

excelSerialDate = 40189;
datestr(excelSerialDate + 693960,'mm/dd/yyyy')
ans =
01/11/2010

Also, if you want to get rid of the leading zero for the month, you can use REGEXPREP to fix things

excelSerialDate = 40189;
regexprep(datestr(excelSerialDate + 693960,'mm/dd/yyyy'),'^0','')
ans =
1/11/2010

How to check existence of user-define table type in SQL Server 2008?

IF EXISTS (SELECT * FROM sys.types WHERE is_table_type = 1 AND name = 'MyType')
    --stuff

sys.types... they aren't schema-scoped objects so won't be in sys.objects

Update, Mar 2013

You can use TYPE_ID too

Why is there no Char.Empty like String.Empty?

myString = myString.Replace('c'.ToString(), "");

OK, this is not particularly elegant for removing letters, since the .Replace method has an overload that takes string parameters. But this works for removing carriage returns, line feeds, tabs, etc. This example removes tab characters:

myString = myString.Replace('\t'.ToString(), "");

running multiple bash commands with subprocess

I just stumbled on a situation where I needed to run a bunch of lines of bash code (not separated with semicolons) from within python. In this scenario the proposed solutions do not help. One approach would be to save a file and then run it with Popen, but it wasn't possible in my situation.

What I ended up doing is something like:

commands = '''
echo "a"
echo "b"
echo "c"
echo "d"
'''

process = subprocess.Popen('/bin/bash', stdin=subprocess.PIPE, stdout=subprocess.PIPE)
out, err = process.communicate(commands)
print out

So I first create the child bash process and after I tell it what to execute. This approach removes the limitations of passing the command directly to the Popen constructor.

How can I convert a string to a float in mysql?

This will convert to a numeric value without the need to cast or specify length or digits:

STRING_COL+0.0

If your column is an INT, can leave off the .0 to avoid decimals:

STRING_COL+0

How do I dynamically set HTML5 data- attributes using react?

Note - if you want to pass a data attribute to a React Component, you need to handle them a little differently than other props.

2 options

Don't use camel case

<Option data-img-src='value' ... />

And then in the component, because of the dashes, you need to refer to the prop in quotes.

// @flow
class Option extends React.Component {

  props: {
    'data-img-src': string
  }

And when you refer to it later, you don't use the dot syntax

  render () {
    return (
      <option data-img-src={this.props['data-img-src']} >...</option>
    )
  }
}

Or use camel case

<Option dataImgSrc='value' ... />

And then in the component, you need to convert.

// @flow
class Option extends React.Component {

  props: {
    dataImgSrc: string
  }

And when you refer to it later, you don't use the dot syntax

  render () {
    return (
      <option data-img-src={this.props.dataImgSrc} >...</option>
    )
  }
}

Mainly just realize data- attributes and aria- attributes are treated specially. You are allowed to use hyphens in the attribute name in those two cases.

PHP remove special character from string

preg_replace('/[^a-zA-Z0-9_ \-()\/%-&]/s', '', $String);

Under what conditions is a JSESSIONID created?

Beware if your page is including other .jsp or .jspf (fragment)! If you don't set

<%@ page session="false" %>

on them as well, the parent page will end up starting a new session and setting the JSESSIONID cookie.

For .jspf pages in particular, this happens if you configured your web.xml with such a snippet:

<jsp-config>
    <jsp-property-group>
        <url-pattern>*.jspf</url-pattern>
    </jsp-property-group>
</jsp-config>

in order to enable scriptlets inside them.

Avoid web.config inheritance in child web application using inheritInChildApplications

We're getting errors about duplicate configuration directives on the one of our apps. After investigation it looks like it's because of this issue.

In brief, our root website is ASP.NET 3.5 (which is 2.0 with specific libraries added), and we have a subapplication that is ASP.NET 4.0.

web.config inheritance causes the ASP.NET 4.0 sub-application to inherit the web.config file of the parent ASP.NET 3.5 application.

However, the ASP.NET 4.0 application's global (or "root") web.config, which resides at C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\web.config and C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\web.config (depending on your bitness), already contains these config sections.

The ASP.NET 4.0 app then tries to merge together the root ASP.NET 4.0 web.config, and the parent web.config (the one for an ASP.NET 3.5 app), and runs into duplicates in the node.

The only solution I've been able to find is to remove the config sections from the parent web.config, and then either

Determine that you didn't need them in your root application, or if you do
Upgrade the parent app to ASP.NET 4.0 (so it gains access to the root web.config's configSections)

What is the JavaScript version of sleep()?

First of all - setTimeout and setInterval is what should be used, because of javascript's callback-ish nature. If you want to use sleep() it's the control flow or the architecture of your code that is incorrect.

Having said that I suppose I still can help with two implementation of a sleep.

faking synchronous run off the top of my head:

//a module to do taht //dual-license: MIT or WTF [you can use it anyhow and leave my nickname in a comment if you want to]
var _=(function(){
 var queue=[];
 var play=function(){
   var go=queue.shift();
     if(go){if(go.a){go.f();play();}else{setTimeout(play,go.t);}}
   }
 return {
   go:function(f){
    queue.push({a:1,f:f});
    },
   sleep:function(t){
    queue.push({a:0,t:t});
    },
   playback:play 
 }
})();

[making playback automatic should also be possible]

//usage

_.go(function(){

//your code
console.log('first');

});


_.sleep(5000);

_.go(function(){

//your code
console.log('next');

});

//this triggers the simulation
_.playback();

real synchronous run

I gave it a lot of thought one day and the only idea I had for a true sleep in javascript is technical.

a sleep function would have to be a synchronous AJAX call with a timeout set to the sleep value. That's all and an only way to have a real sleep()

Renaming files in a folder to sequential numbers

If your rename doesn't support -N, you can do something like this:

ls -1 --color=never -c | xargs rename -n 's/.*/our $i; sprintf("%04d.jpg", $i++)/e'

Edit To start with a given number, you can use the (somewhat ugly-looking) code below, just replace 123 with the number you want:

ls -1 --color=never  -c | xargs rename -n 's/.*/our $i; if(!$i) { $i=123; } sprintf("%04d.jpg", $i++)/e'

This lists files in order by creation time (newest first, add -r to ls to reverse sort), then sends this list of files to rename. Rename uses perl code in the regex to format and increment counter.

However, if you're dealing with JPEG images with EXIF information, I'd recommend exiftool

This is from the exiftool documentation, under "Renaming Examples"

   exiftool '-FileName<CreateDate' -d %Y%m%d_%H%M%S%%-c.%%e dir

   Rename all images in "dir" according to the "CreateDate" date and time, adding a copy number with leading '-' if the file already exists ("%-c"), and
   preserving the original file extension (%e).  Note the extra '%' necessary to escape the filename codes (%c and %e) in the date format string.

How to shrink/purge ibdata1 file in MySQL

Adding to John P's answer,

For a linux system, steps 1-6 can be accomplished with these commands:

mysqldump -u [username] -p[root_password] [database_name] > dumpfilename.sql
mysqladmin -u [username] -p[root_password] drop [database_name]
sudo /etc/init.d/mysqld stop
sudo rm /var/lib/mysql/ibdata1
sudo rm /var/lib/mysql/ib_logfile*
sudo /etc/init.d/mysqld start
mysqladmin -u [username] -p[root_password] create [database_name]
mysql -u [username] -p[root_password] [database_name] < dumpfilename.sql

Warning: these instructions will cause you to lose other databases if you have other databases on this mysql instance. Make sure that steps 1,2 and 6,7 are modified to cover all databases you wish to keep.

Clear contents of cells in VBA using column reference

The issue is not with the with statement, it is on the Range function, it doesn't accept the absolute cell value.. it should be like Range("A4:B100").. you can refer the following thread for reference..

following code should work.. Convert cells(1,1) into "A1" and vice versa

LastColData = Sheets(WSNAME).Range("A4").End(xlToRight).Column
            LastRowData = Sheets(WSNAME).Range("A4").End(xlDown).Row
            Rng = "A4:" & Sheets(WSNAME).Cells(LastRowData, LastColData).Address(RowAbsolute:=False, ColumnAbsolute:=False)

 Worksheets(WSNAME).Range(Rng).ClearContents

How exactly does binary code get converted into letters?

Do you mean the conversion 011001100110111101101111 ? foo, for example? You just take the binary stream, split it into separate bytes (01100110, 01101111, 01101111) and look up the ASCII character that corresponds to given number. For example, 01100110 is 102 in decimal and the ASCII character with code 102 is f:

$ perl -E 'say 0b01100110'
102
$ perl -E 'say chr(102)'
f

(See what the chr function does.) You can generalize this algorithm and have a different number of bits per character and different encodings, the point remains the same.

JQuery Bootstrap Multiselect plugin - Set a value as selected in the multiselect dropdown

 var valArr = ["1","2","3"];

/* Below Code Matches current object's (i.e. option) value with the array values */
 /* Returns -1 if match not found */
 $("select").multiselect("widget").find(":checkbox").each(function(){
    if(jQuery.inArray(this.value, valArr) !=-1)
            this.click();

   });

This selects the options whose value matches with values in array.

Hash function for a string

Use boost::hash

#include <boost\functional\hash.hpp>

...

std::string a = "ABCDE";
size_t b = boost::hash_value(a);

The HTTP request is unauthorized with client authentication scheme 'Ntlm'. The authentication header received from the server was 'Negotiate,NTLM'

You need to set the NTAuthenticationProviders to NTLM

MSDN Article: https://msdn.microsoft.com/en-us/library/ee248703(VS.90).aspx

IIS Command-line (http://msdn.microsoft.com/en-us/library/ms525006(v=vs.90).aspx):

 cscript adsutil.vbs set w3svc/WebSiteValueData/root/NTAuthenticationProviders "NTLM"

Removing duplicates from a list of lists

This should work.

k = [[1, 2], [4], [5, 6, 2], [1, 2], [3], [4]]

k_cleaned = []
for ele in k:
    if set(ele) not in [set(x) for x in k_cleaned]:
        k_cleaned.append(ele)
print(k_cleaned)

# output: [[1, 2], [4], [5, 6, 2], [3]]

Including .cpp files

Because your program now contains two copies of the foo function, once inside foo.cpp and once inside main.cpp

Think of #include as an instruction to the compiler to copy/paste the contents of that file into your code, so you'll end up with a processed main.cpp that looks like this

#include <iostream> // actually you'll get the contents of the iostream header here, but I'm not going to include it!
int foo(int a){
    return ++a;
}

int main(int argc, char *argv[])
{
int x=42;
std::cout << x <<std::endl;
std::cout << foo(x) << std::endl;
return 0;
}

and foo.cpp

int foo(int a){
    return ++a;
}

hence the multiple definition error

Cut Corners using CSS

Another one solution: html:

<div class="background">
  <div class="container">Hello world!</div>
</div>

css:

.background {
  position: relative;
  width: 50px;
  height: 50px;
  border-right: 150px solid lightgreen;
  border-bottom: 150px solid lightgreen;
  border-radius: 10px;
}
.background::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
  border: 25px solid lightgreen;
  border-top-color: transparent;
  border-left-color: transparent;
}
.container {
  position: absolute;
  padding-left: 25px;
  padding-top: 25px;
  font-size: 38px;
  font-weight: bolder;
}

https://codepen.io/eggofevil/pen/KYaMjV

Best way to parse command-line parameters?

I based my approach on the top answer (from dave4420), and tried to improve it by making it more general-purpose.

It returns a Map[String,String] of all command line parameters You can query this for the specific parameters you want (eg using .contains) or convert the values into the types you want (eg using toInt).

def argsToOptionMap(args:Array[String]):Map[String,String]= {
  def nextOption(
      argList:List[String], 
      map:Map[String, String]
    ) : Map[String, String] = {
    val pattern       = "--(\\w+)".r // Selects Arg from --Arg
    val patternSwitch = "-(\\w+)".r  // Selects Arg from -Arg
    argList match {
      case Nil => map
      case pattern(opt)       :: value  :: tail => nextOption( tail, map ++ Map(opt->value) )
      case patternSwitch(opt) :: tail => nextOption( tail, map ++ Map(opt->null) )
      case string             :: Nil  => map ++ Map(string->null)
      case option             :: tail => {
        println("Unknown option:"+option) 
        sys.exit(1)
      }
    }
  }
  nextOption(args.toList,Map())
}

Example:

val args=Array("--testing1","testing1","-a","-b","--c","d","test2")
argsToOptionMap( args  )

Gives:

res0: Map[String,String] = Map(testing1 -> testing1, a -> null, b -> null, c -> d, test2 -> null)

What is the best way to add a value to an array in state

the best away now.

this.setState({ myArr: [...this.state.myArr, new_value] })

How do I create a HTTP Client Request with a cookie?

This answer is deprecated, please see @ankitjaininfo's answer below for a more modern solution

Here's how I think you make a POST request with data and a cookie using just the node http library. This example is posting JSON, set your content-type and content-length accordingly if you post different data.

// NB:- node's http client API has changed since this was written
// this code is for 0.4.x
// for 0.6.5+ see http://nodejs.org/docs/v0.6.5/api/http.html#http.request

var http = require('http');

var data = JSON.stringify({ 'important': 'data' });
var cookie = 'something=anything'

var client = http.createClient(80, 'www.example.com');

var headers = {
    'Host': 'www.example.com',
    'Cookie': cookie,
    'Content-Type': 'application/json',
    'Content-Length': Buffer.byteLength(data,'utf8')
};

var request = client.request('POST', '/', headers);

// listening to the response is optional, I suppose
request.on('response', function(response) {
  response.on('data', function(chunk) {
    // do what you do
  });
  response.on('end', function() {
    // do what you do
  });
});
// you'd also want to listen for errors in production

request.write(data);

request.end();

What you send in the Cookie value should really depend on what you received from the server. Wikipedia's write-up of this stuff is pretty good: http://en.wikipedia.org/wiki/HTTP_cookie#Cookie_attributes

How to stop (and restart) the Rails Server?

In case that doesn't work there is another way that works especially well in Windows: Kill localhost:3000 process from Windows command line

Count number of rows by group using dplyr

There's a special function n() in dplyr to count rows (potentially within groups):

library(dplyr)
mtcars %>% 
  group_by(cyl, gear) %>% 
  summarise(n = n())
#Source: local data frame [8 x 3]
#Groups: cyl [?]
#
#    cyl  gear     n
#  (dbl) (dbl) (int)
#1     4     3     1
#2     4     4     8
#3     4     5     2
#4     6     3     2
#5     6     4     4
#6     6     5     1
#7     8     3    12
#8     8     5     2

But dplyr also offers a handy count function which does exactly the same with less typing:

count(mtcars, cyl, gear)          # or mtcars %>% count(cyl, gear)
#Source: local data frame [8 x 3]
#Groups: cyl [?]
#
#    cyl  gear     n
#  (dbl) (dbl) (int)
#1     4     3     1
#2     4     4     8
#3     4     5     2
#4     6     3     2
#5     6     4     4
#6     6     5     1
#7     8     3    12
#8     8     5     2

Why can I not create a wheel in python?

I tried everything said here without any luck, but found a workaround. After running this command (and failing) : bazel-bin/tensorflow/tools/pip_package/build_pip_package /tmp/tensorflow_pkg

Go to the temporary directory the tool made (given in the output of the last command), then execute python setup.py bdist_wheel. The .whl file is in the dist folder.

Initializing multiple variables to the same value in Java

You can do this:

String one, two, three = two = one = "";

But these will all point to the same instance. It won't cause problems with final variables or primitive types. This way, you can do everything in one line.

Filter dataframe rows if value in column is in a set list of values

You can also directly query your DataFrame for this information.

rpt.query('STK_ID in (600809,600141,600329)')

Or similarly search for ranges:

rpt.query('60000 < STK_ID < 70000')

how to open Jupyter notebook in chrome on windows

In the windows when we open jupyter notebook in command prompt we can see the instructions in first 10 lines in that there is one instruction- "to open notebook, open this file in browser file://C:/Users/{username}/appdata/roaming/jupyetr/runtime/nbserver-xywz-open.html " , open this html with browser of your choice.

Cannot hide status bar in iOS7

You can check this code, pod UIViewController+ODStatusBar

Setting up a git remote origin

For anyone who comes here, as I did, looking for the syntax to change origin to a different location you can find that documentation here: https://help.github.com/articles/changing-a-remote-s-url/. Using git remote add to do this will result in "fatal: remote origin already exists."

Nutshell: git remote set-url origin https://github.com/username/repo

(The marked answer is correct, I'm just hoping to help anyone as lost as I was... haha)

I'm getting Key error in python

Let us make it simple if you're using Python 3

mydict = {'a':'apple','b':'boy','c':'cat'}
check = 'c' in mydict
if check:
    print('c key is present')

If you need else condition

mydict = {'a':'apple','b':'boy','c':'cat'}
if 'c' in mydict:
    print('key present')
else:
    print('key not found')

For the dynamic key value, you can also handle through try-exception block

mydict = {'a':'apple','b':'boy','c':'cat'}
try:
    print(mydict['c'])
except KeyError:
    print('key value not found')mydict = {'a':'apple','b':'boy','c':'cat'}

Summing radio input values

Your javascript is executed before the HTML is generated, so it doesn't "see" the ungenerated INPUT elements. For jQuery, you would either stick the Javascript at the end of the HTML or wrap it like this:

<script type="text/javascript">   $(function() { //jQuery trick to say after all the HTML is parsed.     $("input[type=radio]").click(function() {       var total = 0;       $("input[type=radio]:checked").each(function() {         total += parseFloat($(this).val());       });        $("#totalSum").val(total);     });   }); </script>

EDIT: This code works for me

<!DOCTYPE html> <html> <head> <meta charset="utf-8"> </head> <body>   <strong>Choose a base package:</strong>   <input id="item_0" type="radio" name="pkg" value="1942" />Base Package 1 - $1942   <input id="item_1" type="radio" name="pkg" value="2313" />Base Package 2 - $2313   <input id="item_2" type="radio" name="pkg" value="2829" />Base Package 3 - $2829   <strong>Choose an add on:</strong>   <input id="item_10" type="radio" name="ext" value="0" />No add-on - +$0   <input id="item_12" type="radio" name="ext" value="2146" />Add-on 1 - (+$2146)   <input id="item_13" type="radio" name="ext" value="2455" />Add-on 2 - (+$2455)   <input id="item_14" type="radio" name="ext" value="2764" />Add-on 3 - (+$2764)   <input id="item_15" type="radio" name="ext" value="3073" />Add-on 4 - (+$3073)   <input id="item_16" type="radio" name="ext" value="3382" />Add-on 5 - (+$3382)   <input id="item_17" type="radio" name="ext" value="3691" />Add-on 6 - (+$3691)   <strong>Your total is:</strong>   <input id="totalSum" type="text" name="totalSum" readonly="readonly" size="5" value="" />   <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>   <script type="text/javascript">       $("input[type=radio]").click(function() {         var total = 0;         $("input[type=radio]:checked").each(function() {           total += parseFloat($(this).val());         });          $("#totalSum").val(total);       });     </script> </body> </html>

Simple InputBox function

Probably the simplest way is to use the InputBox method of the Microsoft.VisualBasic.Interaction class:

[void][Reflection.Assembly]::LoadWithPartialName('Microsoft.VisualBasic')

$title = 'Demographics'
$msg   = 'Enter your demographics:'

$text = [Microsoft.VisualBasic.Interaction]::InputBox($msg, $title)

Getting the ID of the element that fired an event

Just use the this reference

$(this).attr("id")

$(this).prop("id")

Change bundle identifier in Xcode when submitting my first app in IOS

This solve my problem.

Just change the Bundle identifier from Build Setting.

 Navigate to Project >> Build Setting >> Product Bundle Identifier

When should I use Lazy<T>?

You typically use it when you want to instantiate something the first time its actually used. This delays the cost of creating it till if/when it's needed instead of always incurring the cost.

Usually this is preferable when the object may or may not be used and the cost of constructing it is non-trivial.

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