Symbol for any number of any characters in regex?

I would use .*. . matches any character, * signifies 0 or more occurrences. You might need a DOTALL switch to the regex to capture new lines with ..

How do I copy a hash in Ruby?

Alternative way to Deep_Copy that worked for me.

h1 = {:a => 'foo'} 
h2 = Hash[h1.to_a]

This produced a deep_copy since h2 is formed using an array representation of h1 rather than h1's references.

Subset data.frame by date

The first thing you should do with date variables is confirm that R reads it as a Date. To do this, for the variable (i.e. vector/column) called Date, in the data frame called EPL2011_12, input

class(EPL2011_12$Date)

The output should read [1] "Date". If it doesn't, you should format it as a date by inputting

EPL2011_12$Date <- as.Date(EPL2011_12$Date, "%d-%m-%y")

Note that the hyphens in the date format ("%d-%m-%y") above can also be slashes ("%d/%m/%y"). Confirm that R sees it as a Date. If it doesn't, try a different formatting command

EPL2011_12$Date <- format(EPL2011_12$Date, format="%d/%m/%y")

Once you have it in Date format, you can use the subset command, or you can use brackets

WhateverYouWant <- EPL2011_12[EPL2011_12$Date > as.Date("2014-12-15"),]

Using both Python 2.x and Python 3.x in IPython Notebook

Under Windows 7 I had anaconda and anaconda3 installed. I went into \Users\me\anaconda\Scripts and executed

sudo .\ipython kernelspec install-self

then I went into \Users\me\anaconda3\Scripts and executed

sudo .\ipython kernel install

(I got jupyter kernelspec install-self is DEPRECATED as of 4.0. You probably want 'ipython kernel install' to install the IPython kernelspec.)

After starting jupyter notebook (in anaconda3) I got a neat dropdown menu in the upper right corner under "New" letting me choose between Python 2 odr Python 3 kernels.

Python string prints as [u'String']

If accessing/printing single element lists (e.g., sequentially or filtered):

my_list = [u'String'] # sample element
my_list = [str(my_list[0])]

iOS8 Beta Ad-Hoc App Download (itms-services)

If you have already installed app on your device, try to change bundle identifer on the web .plist (not app plist) with something else like "com.vistair.docunet-test2", after that refresh webpage and try to reinstall... It works for me

How to access parameters in a Parameterized Build?

I think the variable is available directly, rather than through env, when using Workflow plugin. Try:

node()
{
    print "DEBUG: parameter foo = ${foo}"
}

Insert a string at a specific index

my_string          = "hello world";
my_insert          = " dear";
my_insert_location = 5;

my_string = my_string.split('');  
my_string.splice( my_insert_location , 0, my_insert );
my_string = my_string.join('');

https://jsfiddle.net/gaby_de_wilde/wz69nw9k/

Failed to create provisioning profile

For me this happened when I was making a tvOS app and didn't have a appleTV registered.

In general, you need to plug in the device or have logged into it (connected to it)..then it shows up here: https://developer.apple.com/account/resources/devices/list

You can also add devices there..you need to click reset to be able to add a new device. the reset button should be labeled modify because it doesn't reset anything.

for example, if you need to make a tvOS app then you need to have an apple TV in the device list. Once you add that then you're good to go. kisses.

How get the base URL via context path in JSF?

JSTL 1.2 variation leveraged from BalusC answer

<c:set var="baseURL" value="${pageContext.request.requestURL.substring(0, pageContext.request.requestURL.length() - pageContext.request.requestURI.length())}${pageContext.request.contextPath}/" />

<head>
  <base href="${baseURL}" />

Maven project.build.directory

You can find the most up to date answer for the value in your project just execute the

mvn3 help:effective-pom

command and find the <build> ... <directory> tag's value in the result aka in the effective-pom. It will show the value of the Super POM unless you have overwritten.

How to get access to job parameters from ItemReader, in Spring Batch?

Did you declare the jobparameters as map properly as bean?

Or did you perhaps accidently instantiate a JobParameters object, which has no getter for the filename?

For more on expression language you can find information in Spring documentation here.

Is there a command line command for verifying what version of .NET is installed

You can write yourself a little console app and use System.Environment.Version to find out the version. Scott Hanselman gives a blog post about it.

Or look in the registry for the installed versions. HKLM\Software\Microsoft\NETFramework Setup\NDP

Entity Framework: There is already an open DataReader associated with this Command

Try in your connection string to set MultipleActiveResultSets=true. This allow multitasking on database.

Server=yourserver ;AttachDbFilename=database;User Id=sa;Password=blah ;MultipleActiveResultSets=true;App=EntityFramework

That works for me ... whether your connection in app.config or you set it programmatically ... hope this helpful

How to add/subtract time (hours, minutes, etc.) from a Pandas DataFrame.Index whos objects are of type datetime.time?

The Philippe solution but cleaner:

My subtraction data is: '2018-09-22T11:05:00.000Z'

import datetime
import pandas as pd

df_modified = pd.to_datetime(df_reference.index.values) - datetime.datetime(2018, 9, 22, 11, 5, 0)

Ruby on Rails: Clear a cached page

rake tmp:cache:clear might be what you're looking for.

How to use Redirect in the new react-router-dom of Reactjs

I found that place to put the redirect complent of react-router is in the method render, but if you want to redirect after some validation, by example, the best way to redirect is using the old reliable, window.location.href, i.e.:

evalSuccessResponse(data){
   if(data.code===200){
    window.location.href = urlOneSignHome;
   }else{
     //TODO Something
   }    
}

When you are programming React Native never will need to go outside of the app, and the mechanism to open another app is completely different.

Sort Java Collection

You can use java Custom Class for the purpose of sorting.

How to loop over a Class attributes in Java?

There is no linguistic support to do what you're asking for.

You can reflectively access the members of a type at run-time using reflection (e.g. with Class.getDeclaredFields() to get an array of Field), but depending on what you're trying to do, this may not be the best solution.

Example

Here's a simple example to show only some of what reflection is capable of doing.

import java.lang.reflect.*;

public class DumpFields {
    public static void main(String[] args) {
        inspect(String.class);
    }
    static <T> void inspect(Class<T> klazz) {
        Field[] fields = klazz.getDeclaredFields();
        System.out.printf("%d fields:%n", fields.length);
        for (Field field : fields) {
            System.out.printf("%s %s %s%n",
                Modifier.toString(field.getModifiers()),
                field.getType().getSimpleName(),
                field.getName()
            );
        }
    }
}

The above snippet uses reflection to inspect all the declared fields of class String; it produces the following output:

7 fields:
private final char[] value
private final int offset
private final int count
private int hash
private static final long serialVersionUID
private static final ObjectStreamField[] serialPersistentFields
public static final Comparator CASE_INSENSITIVE_ORDER

Effective Java 2nd Edition, Item 53: Prefer interfaces to reflection

These are excerpts from the book:

Given a Class object, you can obtain Constructor, Method, and Field instances representing the constructors, methods and fields of the class. [They] let you manipulate their underlying counterparts reflectively. This power, however, comes at a price:

You lose all the benefits of compile-time checking.

The code required to perform reflective access is clumsy and verbose.

Performance suffers.

As a rule, objects should not be accessed reflectively in normal applications at runtime.

There are a few sophisticated applications that require reflection. Examples include [...omitted on purpose...] If you have any doubts as to whether your application falls into one of these categories, it probably doesn't.

Can't access Eclipse marketplace

I was facing the same issue and found here useful steps which saved my time a lot. Hope so below attached image will help you a lot-

Window-> Preferences-> General-> Network Connection

Change Active Provider Native to Manual if problem is not resolved by using the steps mentioned in snapshot. Make sure HTTP/HTTPS should be checked and if any IP is required for your proxy settings then you should provide proxy IP in host and port number as well.

mysql query: SELECT DISTINCT column1, GROUP BY column2

Replacing FROM tablename with FROM (SELECT DISTINCT * FROM tablename) should give you the result you want (ignoring duplicated rows) for example:

SELECT name, COUNT(*)
FROM (SELECT DISTINCT * FROM Table1) AS T1
GROUP BY name

Result for your test data:

dave 2
mark 2

this is error ORA-12154: TNS:could not resolve the connect identifier specified?

run the below command in command prompt

tnsping Datasource

This should give a response like below

C:>tnsping *******

TNS Ping Utility for *** Windows: Version *** - Production on *****

Used parameter files: c:\oracle*****

Used **** to resolve the alias Attempting to contact (description=(address_list=(address=(protocol=tcp)(host=)(port=)))(connect_data=(server=)(service_name=)(failover_mode=(type=)(method=)(retries=)(delay=))))** OK (**** msec)

Add the text 'Datasource=' in beginning and credentials at the end. the final string should be

Data Source=(description=(address_list=(address=(protocol=tcp)(host=)(port=)))(connect_data=(server=)(service_name=)(failover_mode=(type=)(method=)(retries=)(delay=))));User Id=;Password=;**

Use this as the connection string to connect to oracle db.

Use tab to indent in textarea

If you really need tabs copy a tab from word or notepad and paste it in the text box where you want it

1 2 3

12 22 33

Unfortunately I think they remove the tabs from these comments though :) It will show as %09 in your POST or GET

How to use systemctl in Ubuntu 14.04

I just encountered this problem myself and found that Ubuntu 14.04 uses Upstart instead of Systemd, so systemctl commands will not work. This changed in 15.04, so one way around this would be to update your ubuntu install.

If this is not an option for you (it's not for me right now), you need to find the Upstart command that does what you need to do.

For enable, the generic looks to be the following:

update-rc.d <service> enable

Link to Ubuntu documentation: https://wiki.ubuntu.com/SystemdForUpstartUsers

JavaScript by reference vs. by value

Primitive type variable like string,number are always pass as pass by value.
Array and Object is passed as pass by reference or pass by value based on these two condition.
- if you are changing value of that Object or array with new Object or Array then it is pass by Value.
  
  object1 = {item: "car"}; array1=[1,2,3];
here you are assigning new object or array to old one.you are not changing the value of property of old object.so it is pass by value.
- if you are changing a property value of an object or array then it is pass by Reference.
  
  object1.item= "car"; array1[0]=9;
here you are changing a property value of old object.you are not assigning new object or array to old one.so it is pass by reference.

Code

    function passVar(object1, object2, number1) {

        object1.key1= "laptop";
        object2 = {
            key2: "computer"
        };
        number1 = number1 + 1;
    }

    var object1 = {
        key1: "car"
    };
    var object2 = {
        key2: "bike"
    };
    var number1 = 10;

    passVar(object1, object2, number1);
    console.log(object1.key1);
    console.log(object2.key2);
    console.log(number1);

Output: -
    laptop
    bike
    10

React navigation goBack() and update parent state

EDITED: The best solution is using NavigationEvents, you don't need to create listeners manually :)

Calling a callback function is not highly recommended, check this example using a listener (Remember to remove all listeners from componentWillUnMount with this option)

Component A

navigateToComponentB() {
  const { navigation } = this.props
  this.navigationListener = navigation.addListener('willFocus', payload => {
    this.removeNavigationListener()
    const { state } = payload
    const { params } = state
    //update state with the new params
    const { otherParam } = params
    this.setState({ otherParam })
  })
  navigation.push('ComponentB', {
    returnToRoute: navigation.state,
    otherParam: this.state.otherParam
  })
}
removeNavigationListener() {
  if (this.navigationListener) {
    this.navigationListener.remove()
    this.navigationListener = null
  }
}
componentWillUnmount() {
  this.removeNavigationListener()
}

Commponent B

returnToComponentA() {
  const { navigation } = this.props
  const { routeName, key } = navigation.getParam('returnToRoute')
  navigation.navigate({ routeName, key, params: { otherParam: 123 } })
}

For more details of the previous example: https://github.com/react-navigation/react-navigation/issues/288#issuecomment-378412411

Regards, Nicholls

latex tabular width the same as the textwidth

The tabularx package gives you

the total width as a first parameter, and
a new column type X, all X columns will grow to fill up the total width.

For your example:

\usepackage{tabularx}
% ...    
\begin{document}
% ...

\begin{tabularx}{\textwidth}{|X|X|X|}
\hline
Input & Output& Action return \\
\hline
\hline
DNF &  simulation & jsp\\
\hline
\end{tabularx}

How to set cookie value with AJAX request?

Basically, ajax request as well as synchronous request sends your document cookies automatically. So, you need to set your cookie to document, not to request. However, your request is cross-domain, and things became more complicated. Basing on this answer, additionally to set document cookie, you should allow its sending to cross-domain environment:

type: "GET",    
url: "http://example.com",
cache: false,
// NO setCookies option available, set cookie to document
//setCookies: "lkfh89asdhjahska7al446dfg5kgfbfgdhfdbfgcvbcbc dfskljvdfhpl",
crossDomain: true,
dataType: 'json',
xhrFields: {
    withCredentials: true
},
success: function (data) {
    alert(data);
});

difference between variables inside and outside of init()

As noted by S.Lott,

Variable set outside init belong to the class. They're shared by all instances.

Variables created inside init (and all other method functions) and prefaced with self. belong to the object instance.

However, Note that class variables can be accessed via self.<var> until they are masked by an object variable with a similar name This means that reading self.<var> before assigning it a value will return the value of Class.<var> but afterwards it will return obj.<var> . Here is an example

In [20]: class MyClass: 
    ...:     elem = 123 
    ...:  
    ...:     def update(self,i): 
    ...:         self.elem=i  
    ...:     def print(self): 
    ...:         print (MyClass.elem, self.elem) 
    ...:  
    ...: c1 = MyClass()  
    ...: c2 = MyClass() 
    ...: c1.print() 
    ...: c2.print()                                                                                                                                                                                                                                                               
123 123 
123 123 
In [21]: c1.update(1) 
    ...: c2.update(42) 
    ...: c1.print() 
    ...: c2.print()                                                                                                                                                                                                                                                               
123 1 
123 42
In [22]: MyClass.elem=22 
    ...: c1.print()  
    ...: c2.print()                                                                                                                                                                                                                                                               
22 1 
22 42

Second note: Consider slots. They may offer a better way to implement object variables.

Position a div container on the right side

if you don't want to use float

<div style="text-align:right; margin:0px auto 0px auto;">
<p> Hello </p>
</div>
  <div style="">
<p> Hello </p>
</div>

What is the size limit of a post request?

As David pointed out, I would go with KB in most cases.

php_value post_max_size 2K

Note: my form is simple, just a few text boxes, not long text.

(PHP shorthand for KB is K, as outlined here.)

Correct way to integrate jQuery plugins in AngularJS

Yes, you are correct. If you are using a jQuery plugin, do not put the code in the controller. Instead create a directive and put the code that you would normally have inside the link function of the directive.

There are a couple of points in the documentation that you could take a look at. You can find them here:
Common Pitfalls

Using controllers correctly

Ensure that when you are referencing the script in your view, you refer it last - after the angularjs library, controllers, services and filters are referenced.

EDIT: Rather than using $(element), you can make use of angular.element(element) when using AngularJS with jQuery

ggplot2: sorting a plot

I don't know why this question was reopened but here is a tidyverse option.

x %>% 
  arrange(desc(value)) %>%
  mutate(variable=fct_reorder(variable,value)) %>% 
ggplot(aes(variable,value,fill=variable)) + geom_bar(stat="identity") + 
  scale_y_continuous("",label=scales::percent) + coord_flip()

How can I solve "Either the parameter @objname is ambiguous or the claimed @objtype (COLUMN) is wrong."?

Both of the following work (as discussed here).

exec sp_rename 'ENG_TEst.[[ENG_Test_A/C_TYPE]]]' , 
                'ENG_Test_A/C_TYPE', 'COLUMN'


exec sp_rename 'ENG_TEst."[ENG_Test_A/C_TYPE]"' , 
                'ENG_Test_A/C_TYPE', 'COLUMN'

Convert Go map to json

If you had caught the error, you would have seen this:

jsonString, err := json.Marshal(datas)
fmt.Println(err)

// [] json: unsupported type: map[int]main.Foo

The thing is you cannot use integers as keys in JSON; it is forbidden. Instead, you can convert these values to strings beforehand, for instance using strconv.Itoa.

See this post for more details: https://stackoverflow.com/a/24284721/2679935

Using PropertyInfo.GetValue()

In your example propertyInfo.GetValue(this, null) should work. Consider altering GetNamesAndTypesAndValues() as follows:

public void GetNamesAndTypesAndValues()
{
  foreach (PropertyInfo propertyInfo in allClassProperties)
  {
    Console.WriteLine("{0} [type = {1}] [value = {2}]",
      propertyInfo.Name,
      propertyInfo.PropertyType,
      propertyInfo.GetValue(this, null));
  }
}

jquery simple image slideshow tutorial

This lookslike something you would be interested in

http://www.designchemical.com/blog/index.php/jquery/jquery-image-swap-gallery/

How can I display the users profile pic using the facebook graph api?

Here is the code that worked for me!

Assuming that you have a valid session going,

//Get the current users id
$uid = $facebook->getUser();

//create the url
$profile_pic =  "http://graph.facebook.com/".$uid."/picture";

//echo the image out
echo "<img src=\"" . $profile_pic . "\" />";

Thanx goes to Raine, you da man!

How to remove all files from directory without removing directory in Node.js

There is package called rimraf that is very handy. It is the UNIX command rm -rf for node.

Nevertheless, it can be too powerful too because you can delete folders very easily using it. The following commands will delete the files inside the folder. If you remove the *, you will remove the log folder.

const rimraf = require('rimraf');
rimraf('./log/*', function () { console.log('done'); });

https://www.npmjs.com/package/rimraf

Permission denied (publickey) when deploying heroku code. fatal: The remote end hung up unexpectedly

I reinstalled heroku toolbelt and it worked.

Wamp Server not goes to green color

I have same issue with IIS, i uninstalled IIS. Type in run services.msc, I see "wampapache64" service was not running, when I start it using right click it give me error.

I just used these steps.

Click on WAMP icon select Apache -> Service -> Remove Service
Click on Wamp icon select Apache -> Service -> Install Service

Got green Wamp icon :(

Converting pfx to pem using openssl

Another perspective for doing it on Linux... here is how to do it so that the resulting single file contains the decrypted private key so that something like HAProxy can use it without prompting you for passphrase.

openssl pkcs12 -in file.pfx -out file.pem -nodes

Then you can configure HAProxy to use the file.pem file.

This is an EDIT from previous version where I had these multiple steps until I realized the -nodes option just simply bypasses the private key encryption. But I'm leaving it here as it may just help with teaching.

openssl pkcs12 -in file.pfx -out file.nokey.pem -nokeys
openssl pkcs12 -in file.pfx -out file.withkey.pem
openssl rsa -in file.withkey.pem -out file.key
cat file.nokey.pem file.key > file.combo.pem

The 1st step prompts you for the password to open the PFX.
The 2nd step prompts you for that plus also to make up a passphrase for the key.
The 3rd step prompts you to enter the passphrase you just made up to store decrypted.
The 4th puts it all together into 1 file.

Then you can configure HAProxy to use the file.combo.pem file.

The reason why you need 2 separate steps where you indicate a file with the key and another without the key, is because if you have a file which has both the encrypted and decrypted key, something like HAProxy still prompts you to type in the passphrase when it uses it.

Differences in boolean operators: & vs && and | vs ||

In Java, the single operators &, |, ^, ! depend on the operands. If both operands are ints, then a bitwise operation is performed. If both are booleans, a "logical" operation is performed.

If both operands mismatch, a compile time error is thrown.

The double operators &&, || behave similarly to their single counterparts, but both operands must be conditional expressions, for example:

if (( a < 0 ) && ( b < 0 )) { ... } or similarly, if (( a < 0 ) || ( b < 0 )) { ... }

source: java programming lang 4th ed

Add element to a JSON file?

One possible issue I see is you set your JSON unconventionally within an array/list object. I would recommend using JSON in its most accepted form, i.e.:

test_json = { "a": 1, "b": 2}

Once you do this, adding a json element only involves the following line:

test_json["c"] = 3

This will result in:

{'a': 1, 'b': 2, 'c': 3}

Afterwards, you can add that json back into an array or a list of that is desired.

$.focus() not working

I tested code from Chrome's DevTool Console and the focus part not worked. I found out later the issue is only present if i run it from DevTool and if i implement the code to the website it works fine. Actually, the element got focused but the DevTool removed it immediately.

Count distinct value pairs in multiple columns in SQL

Another (probably not production-ready or recommended) method I just came up with is to concat the values to a string and count this string distinctively:

SELECT count(DISTINCT concat(id, name, address)) FROM mytable;

"RuntimeError: Make sure the Graphviz executables are on your system's path" after installing Graphviz 2.38

1) Graphviz – download unzip in a particular place in the system (pip does not work in windows ) and include the bin folder in the path (‘set environment variables in windows’ OR) set manually in each program

import os
os.environ["PATH"] += os.pathsep + 'C:/GraphViz/bin'

2) Then put the model to plot

clf = xgb.train(params, d_train, 1000, evals=evallist, early_stopping_rounds=10)
xgb.plot_tree(clf)
plt.rcParams['figure.figsize'] = [50, 10]
plt.show()

Get week day name from a given month, day and year individually in SQL Server

I used

select
case
when (extract (weekday from DATE)=0) then 'Sunday'

and so on...

0 Sunday, 1 Monday...

user authentication libraries for node.js?

There is a project called Drywall that implements a user login system with Passport and also has a user management admin panel. If you're looking for a fully-featured user authentication and management system similar to something like what Django has but for Node.js, this is it. I found it to be a really good starting point for building a node app that required a user authentication and management system. See Jared Hanson's answer for information on how Passport works.

How can I enable CORS on Django REST Framework

For Django versions > 1.10, according to the documentation, a custom MIDDLEWARE can be written as a function, let's say in the file: yourproject/middleware.py (as a sibling of settings.py):

def open_access_middleware(get_response):
    def middleware(request):
        response = get_response(request)
        response["Access-Control-Allow-Origin"] = "*"
        response["Access-Control-Allow-Headers"] = "*"
        return response
    return middleware

and finally, add the python path of this function (w.r.t. the root of your project) to the MIDDLEWARE list in your project's settings.py:

MIDDLEWARE = [
  .
  .
  'django.middleware.clickjacking.XFrameOptionsMiddleware',
  'yourproject.middleware.open_access_middleware'
]

Easy peasy!

Dynamically load JS inside JS

If you have many files with dependencies, use AMD/RequireJS. http://requirejs.org/

Find unique rows in numpy.array

I've compared the suggested alternative for speed and found that, surprisingly, the void view unique solution is even a bit faster than numpy's native unique with the axis argument. If you're looking for speed, you'll want

numpy.unique(
    a.view(numpy.dtype((numpy.void, a.dtype.itemsize*a.shape[1])))
).view(a.dtype).reshape(-1, a.shape[1])

There is a bug report on GitHub for this, too.

Code to reproduce the plot:

import numpy
import perfplot


def unique_void_view(a):
    return (
        numpy.unique(a.view(numpy.dtype((numpy.void, a.dtype.itemsize * a.shape[1]))))
        .view(a.dtype)
        .reshape(-1, a.shape[1])
    )


def lexsort(a):
    ind = numpy.lexsort(a.T)
    return a[
        ind[numpy.concatenate(([True], numpy.any(a[ind[1:]] != a[ind[:-1]], axis=1)))]
    ]


def vstack(a):
    return numpy.vstack([tuple(row) for row in a])


def unique_axis(a):
    return numpy.unique(a, axis=0)


perfplot.show(
    setup=lambda n: numpy.random.randint(2, size=(n, 20)),
    kernels=[unique_void_view, lexsort, vstack, unique_axis],
    n_range=[2 ** k for k in range(15)],
    xlabel="len(a)",
    equality_check=None,
)

Create Hyperlink in Slack

Recently it became possible (but with an odd workaround).

To do this you must first create text with the desired hyperlink in an editor that supports rich text formatting. This can be an advanced text editor, web browser, email client, web-development IDE, etc.). Then copypaste the text from the editor or rendered HTML from browser (or other). E.g. in the example below I copypasted the head of this StackOverflow page. As you may see, the hyperlink have been copied correctly and is clickable in the message (checked on Mac Desktop, browser, and iOS apps).

On Mac

I was able to compose the desired link in the native Pages app as shown below. When you are done, copypaste your text into Slack app. This is the probably easiest way on Mac OS.

On Windows

I have a strong suspicion that MS Word will do the same trick, but unfortunately I don't have an installed instance to check.

Universal

Create text in an online editor, such as Google Documents. Use Insert -> Link, modify the text and web URL, then copypaste into Slack.

Passing parameters in Javascript onClick event

link.onclick = function() { onClickLink(i+''); };

Is a closure and stores a reference to the variable i, not the value that i holds when the function is created. One solution would be to wrap the contents of the for loop in a function do this:

for (var i = 0; i < 10; i++) (function(i) {
    var link = document.createElement('a');
    link.setAttribute('href', '#');
    link.innerHTML = i + '';
    link.onclick=  function() { onClickLink(i+'');};
    div.appendChild(link);
    div.appendChild(document.createElement('BR'));
}(i));

How to add multiple font files for the same font?

/*
# +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# dejavu sans
# +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
*/
/*default version*/
@font-face {
    font-family: 'DejaVu Sans';
    src: url('dejavu/DejaVuSans.ttf'); /* IE9 Compat Modes */
    src: 
        local('DejaVu Sans'),
        local('DejaVu-Sans'), /* Duplicated name with hyphen */
        url('dejavu/DejaVuSans.ttf') 
        format('truetype');
}
/*bold version*/
@font-face {
    font-family: 'DejaVu Sans';
    src: url('dejavu/DejaVuSans-Bold.ttf'); 
    src: 
        local('DejaVu Sans'),
        local('DejaVu-Sans'),
        url('dejavu/DejaVuSans-Bold.ttf') 
        format('truetype');
    font-weight: bold;
}
/*italic version*/
@font-face {
    font-family: 'DejaVu Sans';
    src: url('dejavu/DejaVuSans-Oblique.ttf'); 
    src: 
        local('DejaVu Sans'),
        local('DejaVu-Sans'),
        url('dejavu/DejaVuSans-Oblique.ttf') 
        format('truetype');
    font-style: italic;
}
/*bold italic version*/
@font-face {
    font-family: 'DejaVu Sans';
    src: url('dejavu/DejaVuSans-BoldOblique.ttf'); 
    src: 
        local('DejaVu Sans'),
        local('DejaVu-Sans'),
        url('dejavu/DejaVuSans-BoldOblique.ttf') 
        format('truetype');
    font-weight: bold;
    font-style: italic;
}

dyld: Library not loaded: /usr/local/opt/icu4c/lib/libicui18n.62.dylib error running php after installing node with brew on Mac

For me brew reinstall nodejs fixed this - my issue was with running Elixir/Phoenix so not PHP specific, I think it was caused by brew install postgres, but reinstalling that didn't help. I was getting it from npm commands.

How to reload a page using Angularjs?

You can also try this, after injecting $window service.

$window.location.reload();

Convert ascii char[] to hexadecimal char[] in C

#include <stdio.h>
#include <string.h>

int main(void){
    char word[17], outword[33];//17:16+1, 33:16*2+1
    int i, len;

    printf("Intro word:");
    fgets(word, sizeof(word), stdin);
    len = strlen(word);
    if(word[len-1]=='\n')
        word[--len] = '\0';

    for(i = 0; i<len; i++){
        sprintf(outword+i*2, "%02X", word[i]);
    }
    printf("%s\n", outword);
    return 0;
}

How do I delete rows in a data frame?

By simplified sequence :

mydata[-(1:3 * 2), ]

By sequence :

mydata[seq(1, nrow(mydata), by = 2) , ]

By negative sequence :

mydata[-seq(2, nrow(mydata), by = 2) , ]

Or if you want to subset by selecting odd numbers:

mydata[which(1:nrow(mydata) %% 2 == 1) , ]

Or if you want to subset by selecting odd numbers, version 2:

mydata[which(1:nrow(mydata) %% 2 != 0) , ]

Or if you want to subset by filtering even numbers out:

mydata[!which(1:nrow(mydata) %% 2 == 0) , ]

Or if you want to subset by filtering even numbers out, version 2:

mydata[!which(1:nrow(mydata) %% 2 != 1) , ]

.mp4 file not playing in chrome

Encountering the same problem, I solved this by reconverting the file with default mp4 settings in iMovie.

How can I debug git/git-shell related problems?

try this one:

GIT_TRACE=1 git pull origin master

Including non-Python files with setup.py

I just wanted to follow up on something I found working with Python 2.7 on Centos 6. Adding the package_data or data_files as mentioned above did not work for me. I added a MANIFEST.IN with the files I wanted which put the non-python files into the tarball, but did not install them on the target machine via RPM.

In the end, I was able to get the files into my solution using the "options" in the setup/setuptools. The option files let you modify various sections of the spec file from setup.py. As follows.

from setuptools import setup


setup(
    name='theProjectName',
    version='1',
    packages=['thePackage'],
    url='',
    license='',
    author='me',
    author_email='[email protected]',
    description='',
    options={'bdist_rpm': {'install_script': 'filewithinstallcommands'}},
)

file - MANIFEST.in:

include license.txt

file - filewithinstallcommands:

mkdir -p $RPM_BUILD_ROOT/pathtoinstall/
#this line installs your python files
python setup.py install -O1 --root=$RPM_BUILD_ROOT --record=INSTALLED_FILES
#install license.txt into /pathtoinstall folder
install -m 700 license.txt $RPM_BUILD_ROOT/pathtoinstall/
echo /pathtoinstall/license.txt >> INSTALLED_FILES

Centering image and text in R Markdown for a PDF report

None of the answers work for all output types the same way and others focus on figures plottet within the code chunk and not external images.

The include_graphics() function provides an easy solution. The only argument is the name of the file (with the relative path if it's in a subfolder). By setting echo to FALSE and fig.align=center you get the wished result.

```{r, echo=FALSE, fig.align='center'}
include_graphics("image.jpg")
```

Checking to see if a DateTime variable has had a value assigned

The only way of having a variable which hasn't been assigned a value in C# is for it to be a local variable - in which case at compile-time you can tell that it isn't definitely assigned by trying to read from it :)

I suspect you really want Nullable<DateTime> (or DateTime? with the C# syntactic sugar) - make it null to start with and then assign a normal DateTime value (which will be converted appropriately). Then you can just compare with null (or use the HasValue property) to see whether a "real" value has been set.

How do I restrict an input to only accept numbers?

SOLUTION: I make a directive for all inputs, number, text, or any, in the app, so you can input a value and change the event. Make for angular 6

 import { Directive, ElementRef, HostListener, Input } from '@angular/core';

 @Directive({
// tslint:disable-next-line:directive-selector
selector: 'input[inputType]'
})
  export class InputTypeDirective {
 constructor(private _el: ElementRef) {}

 @Input() inputType: string;
 // tipos: number, letter, cuit, tel

@HostListener('input', ['$event']) onInputChange(event) {
if (!event.data) {
  return;
}

switch (this.inputType) {
  case 'number': {
    const initalValue = this._el.nativeElement.value;
    this._el.nativeElement.value = initalValue.replace(/[^0-9]*/g, '');
    if (initalValue !== this._el.nativeElement.value) {
      event.stopPropagation();
    }
     break;
          }
       case 'text': {
        const result = event.data.match(/[^a-zA-Z Ññ]*/g);
        if (result[0] !== '') {
           const initalValue = this._el.nativeElement.value;
           this._el.nativeElement.value = initalValue.replace(
          /[^a-zA-Z Ññ]*/g,
           ''
         );
           event.stopPropagation();
        }
        break;
    }
        case 'tel':
          case 'cuit': {
         const initalValue = this._el.nativeElement.value;
      this._el.nativeElement.value = initalValue.replace(/[^0-9-]*/g, '');
       if (initalValue !== this._el.nativeElement.value) {
         event.stopPropagation();
       }
     }
   }
  }
   }

HTML

     <input matInput inputType="number" [formControlName]="field.name" [maxlength]="field.length" [placeholder]="field.label | translate"  type="text" class="filter-input">

What does Ruby have that Python doesn't, and vice versa?

Syntax is not a minor thing, it has a direct impact on how we think. It also has a direct effect on the rules we create for the systems we use. As an example we have the order of operations because of the way we write mathematical equations or sentences. The standard notation for mathematics allows people to read it more than one way and arrive at different answers given the same equation. If we had used prefix or postfix notation we would have created rules to distinguish what the numbers to be manipulated were rather than only having rules for the order in which to compute values.

The standard notation makes it plain what numbers we are talking about while making the order in which to compute them ambiguous. Prefix and postfix notation make the order in which to compute plain while making the numbers ambiguous. Python would already have multiline lambdas if it were not for the difficulties caused by the syntactic whitespace. (Proposals do exist for pulling this kind of thing off without necessarily adding explicit block delimiters.)

I find it easier to write conditions where I want something to occur if a condition is false much easier to write with the unless statement in Ruby than the semantically equivalent "if-not" construction in Ruby or other languages for example. If most of the languages that people are using today are equal in power, how can the syntax of each language be considered a trivial thing? After specific features like blocks and inheritance mechanisms etc. syntax is the most important part of a language,hardly a superficial thing.

What is superficial are the aesthetic qualities of beauty that we ascribe to syntax. Aesthetics have nothing to do with how our cognition works, syntax does.

BAT file: Open new cmd window and execute a command in there

You may already find your answer because it was some time ago you asked. But I tried to do something similar when coding ror. I wanted to run "rails server" in a new cmd window so I don't have to open a new cmd and then find my path again.

What I found out was to use the K switch like this:

start cmd /k echo Hello, World!

start before "cmd" will open the application in a new window and "/K" will execute "echo Hello, World!" after the new cmd is up.

You can also use the /C switch for something similar.

start cmd /C pause

This will then execute "pause" but close the window when the command is done. In this case after you pressed a button. I found this useful for "rails server", then when I shutdown my dev server I don't have to close the window after.

Use the following in your batch file:

start cmd.exe /c "more-batch-commands-here"

start cmd.exe /k "more-batch-commands-here"

/c Carries out the command specified by string and then terminates

/k Carries out the command specified by string but remains

The /c and /k options controls what happens once your command finishes running. With /c the terminal window will close automatically, leaving your desktop clean. With /k the terminal window will remain open. It's a good option if you want to run more commands manually afterwards.

Consult the cmd.exe documentation using cmd /? for more details.

Escaping Commands with White Spaces

The proper formatting of the command string becomes more complicated when using arguments with spaces. See the examples below. Note the nested double quotes in some examples.

Examples:

Run a program and pass a filename parameter:
CMD /c write.exe c:\docs\sample.txt

Run a program and pass a filename which contains whitespace:
CMD /c write.exe "c:\sample documents\sample.txt"

Spaces in program path:
CMD /c ""c:\Program Files\Microsoft Office\Office\Winword.exe""

Spaces in program path + parameters:
CMD /c ""c:\Program Files\demo.cmd"" Parameter1 Param2
CMD /k ""c:\batch files\demo.cmd" "Parameter 1 with space" "Parameter2 with space""

Launch demo1 and demo2:
CMD /c ""c:\Program Files\demo1.cmd" & "c:\Program Files\demo2.cmd""

Source: http://ss64.com/nt/cmd.html

How to retrieve unique count of a field using Kibana + Elastic Search

Unique counts of field values are achieved by using facets. See ES documentation for the full story, but the gist is that you will create a query and then ask ES to prepare facets on the results for counting values found in fields. It's up to you to customize the fields used and even describe how you want the values returned. The most basic of facet types is just to group by terms, which would be like an IP address above. You can get pretty complex with these, even requiring a query within your facet!

{
    "query": {
        "match_all": {}
    },
    "facets": {
        "terms": {
            "field": "ip_address"
        }
    }
}

The program can’t start because MSVCR71.dll is missing from your computer. Try reinstalling the program to fix this program

Based on this page:

Run regedit (remember to run it as the administrator)
Expand HKEY_LOCAL_MACHINE
Expand SOFTWARE
Expand Microsoft
Expand Windows
Expand CurrentVersion
Expand App Paths
At App Paths, add a new KEY called sqldeveloper.exe
Expand sqldeveloper.exe
Modify the (DEFAULT) value to the full pathway to the sqldeveloper executable (See example below step 11)
Create a new STRING VALUE called PATH and set it value to the sqldeveloper pathway + \jdk\jre\bin

Entity Framework: table without primary key

In my case I had to map an entity to a View, which didn't have primary key. Moreover, I wasn't allowed to modify this View. Fortunately, this View had a column which was a unique string. My solution was to mark this column as a primary key:

[Key]
[DatabaseGenerated(DatabaseGeneratedOption.None)]
[StringLength(255)]
public string UserSID { get; set; }

Cheated EF. Worked perfectly, no one noticed... :)

How to increase memory limit for PHP over 2GB?

You should have 64-bit OS on hardware that supports 64-bit OS, 64-bit Apache version and the same for PHP. But this does not guarantee that functions that are work with PDF can use such big sizes of memory. You'd better not load the whole file into memory, split it into chunks or use file functions to seek on it without loading to RAM.

sendUserActionEvent() is null

This has to do with having two buttons with the same ID in two different Activities, sometimes Android Studio can't find, You just have to give your button a new ID and re Build the Project

how to add new <li> to <ul> onclick with javascript

You were almost there:

You just need to append the li to ul and voila!

So just add

ul.appendChild(li);

to the end of your function so the end function will be like this:

function function1() {
  var ul = document.getElementById("list");
  var li = document.createElement("li");
  li.appendChild(document.createTextNode("Element 4"));
  ul.appendChild(li);
}

Add a CSS class to <%= f.submit %>

<%= f.submit 'name of button here', :class => 'submit_class_name_here' %>

This should do. If you're getting an error, chances are that you're not supplying the name.

Alternatively, you can style the button without a class:

form#form_id_here input[type=submit]

Try that, as well.

What's a concise way to check that environment variables are set in a Unix shell script?

bash 4.2 introduced the -v operator which tests if a name is set to any value, even the empty string.

$ unset a
$ b=
$ c=
$ [[ -v a ]] && echo "a is set"
$ [[ -v b ]] && echo "b is set"
b is set
$ [[ -v c ]] && echo "c is set"
c is set

How can I remove the "No file chosen" tooltip from a file input in Chrome?

The default tooltip can be edited by using the title attribute

<input type='file' title="your text" />

But if you try to remove this tooltip

<input type='file' title=""/>

This won't work. Here is my little trick to work this, try title with a space. It will work.:)

<input type='file' title=" "/>

Passing an array as parameter in JavaScript

Just remove the .value, like this:

function(arrayP){    
   for(var i = 0; i < arrayP.length; i++){
      alert(arrayP[i]);    //no .value here
   }
}

Sure you can pass an array, but to get the element at that position, use only arrayName[index], the .value would be getting the value property off an object at that position in the array - which for things like strings, numbers, etc doesn't exist. For example, "myString".value would also be undefined.

Right to Left support for Twitter Bootstrap 3

I highly recommend bootstrap-rtl. It is built over Bootstrap core, and rtl support is added as it is a bootstrap theme. This would make your code more maintainable as you can always update your core bootstrap files. CDN
Another option to use this stand-alone library, It also comes with few awesome Arabic fonts.

How to split a string by spaces in a Windows batch file?

Three possible solutions to iterate through the words of the string:

Version 1:

@echo off & setlocal
set s=AAA BBB CCC DDD EEE FFF
for %%a in (%s%) do echo %%a

Version 2:

@echo off & setlocal
set s=AAA BBB CCC DDD EEE FFF
set t=%s%
:loop
for /f "tokens=1*" %%a in ("%t%") do (
   echo %%a
   set t=%%b
   )
if defined t goto :loop

Version 3:

@echo off & setlocal
set s=AAA BBB CCC DDD EEE FFF
call :sub1 %s%
exit /b
:sub1
if "%1"=="" exit /b
echo %1
shift
goto :sub1

Version 1 does not work when the string contains wildcard characters like '*' or '?'.

Versions 1 and 3 treat characters like '=', ';' or ',' as word separators. These characters have the same effect as the space character.

Is there a way to 'pretty' print MongoDB shell output to a file?

you can use this command to acheive it:

mongo admin -u <userName> -p <password> --quiet --eval "cursor = rs.status(); printjson(cursor)" > output.json

How to compare variables to undefined, if I don’t know whether they exist?

!undefined is true in javascript, so if you want to know whether your variable or object is undefined and want to take actions, you could do something like this:

if(<object or variable>) {
     //take actions if object is not undefined
} else {
     //take actions if object is undefined
}

json_encode is returning NULL?

few day ago I have the SAME problem with 1 table.

Firstly try:

echo json_encode($rows);
echo json_last_error();  // returns 5 ?

If last line returns 5, problem is with your data. I know, your tables are in UTF-8, but not entered data. For example the input was in txt file, but created on Win machine with stupid encoding (in my case Win-1250 = CP1250) and this data has been entered into the DB.

Solution? Look for new data (excel, web page), edit source txt file via PSPad (or whatever else), change encoding to UTF-8, delete all rows and now put data from original. Save. Enter into DB.

You can also only change encoding to utf-8 and then change all rows manually (give cols with special chars - desc, ...). Good for slaves...

Getting Unexpected Token Export

In case you get this error, it might also be related to how you included the JavaScript file into your html page. When loading modules, you have to explicitly declare those files as such. Here's an example:

//module.js:
function foo(){
   return "foo";
}

var bar = "bar";

export { foo, bar };

When you include the script like this:

<script src="module.js"></script>

You will get the error:

Uncaught SyntaxError: Unexpected token export

You need to include the file with a type attribute set to "module":

<script type="module" src="module.js"></script>

then it should work as expected and you are ready to import your module in another module:

import { foo, bar } from  "./module.js";

console.log( foo() );
console.log( bar );

Warnings Your Apk Is Using Permissions That Require A Privacy Policy: (android.permission.READ_PHONE_STATE)

It may be because of any third party lib which may include that permission so from my experience in this field You have to add the privacy policy regarding to that particular information it means if you ask get accounts permission in your app than you have to declare that with your privacy policy file we use that data i.e. email address or whatever with reasons like to login in google play game.

Also can do this

<uses-permission android:name="android.permission.READ_PHONE_STATE" tools:node="remove" />

Hope This Will Guide you What You can do for this warning create privacy policy for your app and attach that with store listing.

Google Geocoding API - REQUEST_DENIED

I had this problem and I realized that I was assuming that Geocoding came with the JS maps API. However, it is a separate API which I hadn't enabled in the cloud console. Enabling it fixed it right away.

What does the M stand for in C# Decimal literal notation?

Well, i guess M represent the mantissa. Decimal can be used to save money, but it doesn't mean, decimal only used for money.

Get list from pandas dataframe column or row?

 amount = list()
    for col in df.columns:
        val = list(df[col])
        for v in val:
            amount.append(v)

Why is "throws Exception" necessary when calling a function?

If you propagate the exception by declaring the throws directive in the signature of the current method, then somewhere up the line or call stack a try/catch construct must be used to handle the exception.

Releasing memory in Python

eryksun has answered question #1, and I've answered question #3 (the original #4), but now let's answer question #2:

Why does it release 50.5mb in particular - what is the amount that is released based on?

What it's based on is, ultimately, a whole series of coincidences inside Python and malloc that are very hard to predict.

First, depending on how you're measuring memory, you may only be measuring pages actually mapped into memory. In that case, any time a page gets swapped out by the pager, memory will show up as "freed", even though it hasn't been freed.

Or you may be measuring in-use pages, which may or may not count allocated-but-never-touched pages (on systems that optimistically over-allocate, like linux), pages that are allocated but tagged MADV_FREE, etc.

If you really are measuring allocated pages (which is actually not a very useful thing to do, but it seems to be what you're asking about), and pages have really been deallocated, two circumstances in which this can happen: Either you've used brk or equivalent to shrink the data segment (very rare nowadays), or you've used munmap or similar to release a mapped segment. (There's also theoretically a minor variant to the latter, in that there are ways to release part of a mapped segment—e.g., steal it with MAP_FIXED for a MADV_FREE segment that you immediately unmap.)

But most programs don't directly allocate things out of memory pages; they use a malloc-style allocator. When you call free, the allocator can only release pages to the OS if you just happen to be freeing the last live object in a mapping (or in the last N pages of the data segment). There's no way your application can reasonably predict this, or even detect that it happened in advance.

CPython makes this even more complicated—it has a custom 2-level object allocator on top of a custom memory allocator on top of malloc. (See the source comments for a more detailed explanation.) And on top of that, even at the C API level, much less Python, you don't even directly control when the top-level objects are deallocated.

So, when you release an object, how do you know whether it's going to release memory to the OS? Well, first you have to know that you've released the last reference (including any internal references you didn't know about), allowing the GC to deallocate it. (Unlike other implementations, at least CPython will deallocate an object as soon as it's allowed to.) This usually deallocates at least two things at the next level down (e.g., for a string, you're releasing the PyString object, and the string buffer).

If you do deallocate an object, to know whether this causes the next level down to deallocate a block of object storage, you have to know the internal state of the object allocator, as well as how it's implemented. (It obviously can't happen unless you're deallocating the last thing in the block, and even then, it may not happen.)

If you do deallocate a block of object storage, to know whether this causes a free call, you have to know the internal state of the PyMem allocator, as well as how it's implemented. (Again, you have to be deallocating the last in-use block within a malloced region, and even then, it may not happen.)

If you do free a malloced region, to know whether this causes an munmap or equivalent (or brk), you have to know the internal state of the malloc, as well as how it's implemented. And this one, unlike the others, is highly platform-specific. (And again, you generally have to be deallocating the last in-use malloc within an mmap segment, and even then, it may not happen.)

So, if you want to understand why it happened to release exactly 50.5mb, you're going to have to trace it from the bottom up. Why did malloc unmap 50.5mb worth of pages when you did those one or more free calls (for probably a bit more than 50.5mb)? You'd have to read your platform's malloc, and then walk the various tables and lists to see its current state. (On some platforms, it may even make use of system-level information, which is pretty much impossible to capture without making a snapshot of the system to inspect offline, but luckily this isn't usually a problem.) And then you have to do the same thing at the 3 levels above that.

So, the only useful answer to the question is "Because."

Unless you're doing resource-limited (e.g., embedded) development, you have no reason to care about these details.

And if you are doing resource-limited development, knowing these details is useless; you pretty much have to do an end-run around all those levels and specifically mmap the memory you need at the application level (possibly with one simple, well-understood, application-specific zone allocator in between).

how to output every line in a file python

Loop through the file.

f = open("masters.txt")
lines = f.readlines()
for line in lines:
    print line

Can I change the headers of the HTTP request sent by the browser?

I would partially disagree with Milan's suggestion of embedding the requested representation in the URI.

If anyhow possible, URIs should only be used for addressing resources and not for tunneling HTTP methods/verbs. Eventually, specific business action (edit, lock, etc.) could be embedded in the URI if create (POST) or update (PUT) alone do not serve the purpose:

POST http://shonzilla.com/orders/08/165;edit

In the case of requesting a particular representation in URI you would need to disrupt your URI design eventually making it uglier, mixing two distinct REST concepts in the same place (i.e. URI) and making it harder to generically process requests on the server-side. What Milan is suggesting and many are doing the same, incl. Flickr, is exactly this.

Instead, a more RESTful approach would be using a separate place to encode preferred representation by using Accept HTTP header which is used for content negotiation where client tells to the server which content types it can handle/process and server tries to fulfill client's request. This approach is a part of HTTP 1.1 standard, software compliant and supported by web browsers as well.

Compare this:

GET /orders/08/165.xml HTTP/1.1
or
GET /orders/08/165&format=xml HTTP/1.1

to this:

GET /orders/08/165 HTTP/1.1
Accept: application/xml

From a web browser you can request any content type by using setRequestHeader method of XMLHttpRequest object. For example:

function getOrder(year, yearlyOrderId, contentType) {
 var client = new XMLHttpRequest();
 client.open("GET", "/order/" + year + "/" + yearlyOrderId);
 client.setRequestHeader("Accept", contentType);
 client.send(orderDetails);
}

To sum it up: the address, i.e. the URI of a resource should be independent of its representation and XMLHttpRequest.setRequestHeader method allows you to request any representation using the Accept HTTP header.

Cheers!
Shonzilla

JSON datetime between Python and JavaScript

If you're certain that only Javascript will be consuming the JSON, I prefer to pass Javascript Date objects directly.

The ctime() method on datetime objects will return a string that the Javascript Date object can understand.

import datetime
date = datetime.datetime.today()
json = '{"mydate":new Date("%s")}' % date.ctime()

Javascript will happily use that as an object literal, and you've got your Date object built right in.

How can I uninstall npm modules in Node.js?

In case you are on Windows, run CMD as administrator and type:

npm -g uninstall <package name>

Any easy way to use icons from resources?

After adding the ICO file to your apps resources, you can use references it using My.Resources.YourIconNameWithoutExtension

For example if I had a file called Logo-square.ico added to my apps resources, I can set it to an icon with:

NotifyIcon1.Icon = My.Resources.Logo_square

What is the purpose of the word 'self'?

Python is not a language built for Object Oriented Programming unlike Java or C++.

When calling a static method in Python, one simply writes a method with regular arguments inside it.

class Animal():
    def staticMethod():
        print "This is a static method"

However, an object method, which requires you to make a variable, which is an Animal, in this case, needs the self argument

class Animal():
    def objectMethod(self):
        print "This is an object method which needs an instance of a class"

The self method is also used to refer to a variable field within the class.

class Animal():
    #animalName made in constructor
    def Animal(self):
        self.animalName = "";


    def getAnimalName(self):
        return self.animalName

In this case, self is referring to the animalName variable of the entire class. REMEMBER: If you have a variable within a method, self will not work. That variable is simply existent only while that method is running. For defining fields (the variables of the entire class), you have to define them OUTSIDE the class methods.

If you don't understand a single word of what I am saying, then Google "Object Oriented Programming." Once you understand this, you won't even need to ask that question :).

How to submit a form when the return key is pressed?

Here is how I do it with jQuery

j(".textBoxClass").keypress(function(e)
{
    // if the key pressed is the enter key
    if (e.which == 13)
    {
        // do work
    }
});

Other javascript wouldnt be too different. the catch is checking for keypress argument of "13", which is the enter key

How can I quickly and easily convert spreadsheet data to JSON?

Assuming you really mean easiest and are not necessarily looking for a way to do this programmatically, you can do this:

Add, if not already there, a row of "column Musicians" to the spreadsheet. That is, if you have data in columns such as:
```
Rory Gallagher      Guitar
Gerry McAvoy        Bass
Rod de'Ath          Drums
Lou Martin          Keyboards
Donkey Kong Sioux   Self-Appointed Semi-official Stomper
```
Note: you might want to add "Musician" and "Instrument" in row 0 (you might have to insert a row there)
Save the file as a CSV file.
Copy the contents of the CSV file to the clipboard
Go to http://www.convertcsv.com/csv-to-json.htm
Verify that the "First row is column names" checkbox is checked
Paste the CSV data into the content area

Mash the "Convert CSV to JSON" button

With the data shown above, you will now have:

[
  {
    "MUSICIAN":"Rory Gallagher",
    "INSTRUMENT":"Guitar"
  },
  {
    "MUSICIAN":"Gerry McAvoy",
    "INSTRUMENT":"Bass"
  },
  {
    "MUSICIAN":"Rod D'Ath",
    "INSTRUMENT":"Drums"
  },
  {
    "MUSICIAN":"Lou Martin",
    "INSTRUMENT":"Keyboards"
  }
  {
    "MUSICIAN":"Donkey Kong Sioux",
    "INSTRUMENT":"Self-Appointed Semi-Official Stomper"
  }
]

With this simple/minimalistic data, it's probably not required, but with large sets of data, it can save you time and headache in the proverbial long run by checking this data for aberrations and abnormalcy.

Go here: http://jsonlint.com/
Paste the JSON into the content area
Pres the "Validate" button.

If the JSON is good, you will see a "Valid JSON" remark in the Results section below; if not, it will tell you where the problem[s] lie so that you can fix it/them.

Android list view inside a scroll view

If for some reason you don't want to use addHeaderView and addFooterView, e.g. when you have several lists, a good idea would be to reuse ListAdapter to populate a simple LinearLayout so there's no scrolling functionality.

If you already have a whole fragment derived from ListFragment and want to convert it to a similar fragment with simple LinearLayout without scrolling instead (e.g. to put it in ScrollView), you can implement an adapter fragment like this:

// converts listFragment to linearLayout (no scrolling)
// please call init() after fragment is inflated to set listFragment to convert
public class ListAsArrayFragment extends Fragment {
    public ListAsArrayFragment() {}

    private ListFragment mListFragment;
    private LinearLayout mRootView;


    // please call me!
    public void init(Activity activity, ListFragment listFragment){
        mListFragment = listFragment;
        mListFragment.onAttach(activity);
        mListFragment.getListAdapter().registerDataSetObserver(new DataSetObserver() {
            @Override
            public void onChanged() {
                super.onChanged();
                refreshView();
            }
        });
    }


    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // create an empty vertical LinearLayout as the root view of this fragment
        mRootView = new LinearLayout(getActivity());
        mRootView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));
        mRootView.setOrientation(LinearLayout.VERTICAL);
        return mRootView;
    }

    // reusing views for performance
    // todo: support for more than one view type
    ArrayList<View> mViewsToReuse = new ArrayList<>();
    ArrayList<View> mCurrentViews = new ArrayList<>();

    // re-add views to linearLayout
    void refreshView(){

        // remove old views from linearLayout and move them to mViewsToReuse
        mRootView.removeAllViews();
        mViewsToReuse.addAll(mCurrentViews);
        mCurrentViews.clear();

        // create new views
        for(int i=0; i<mListFragment.getListAdapter().getCount(); ++i){
            View viewToReuse = null;
            if(!mViewsToReuse.isEmpty()){
                viewToReuse = mViewsToReuse.get(mViewsToReuse.size()-1);
                mViewsToReuse.remove(mViewsToReuse.size()-1);
            }
            final View view = mListFragment.getListAdapter().getView(i, viewToReuse, mRootView);
            ViewGroup.LayoutParams oldParams = view.getLayoutParams();
            view.setLayoutParams(new LinearLayout.LayoutParams(oldParams.width, oldParams.height));
            final int finalI = i;

            // pass click events to listFragment
            view.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    mListFragment.onListItemClick(null, view, finalI, finalI);
                }
            });
            mRootView.addView(view);
            mCurrentViews.add(view);
        }
    }

You may also want to forward onCreate, onPause, onResume, etc. to the original fragment depending on your needs or try inheritance instead of composition (but override certain methods so original fragment is not actually attached to layout hierarchy); but I wanted to isolate original fragment as much as possible, because we only need to extract its ListAdapter. If you call original fragment's setListAdapter in onAttach, that's probably enough.

Here's how to use ListAsArrayFragment to include OriginalListFragment without scrolling. In parent activity's onCreate:

ListAsArrayFragment fragment = (ListAsArrayFragment) getFragmentManager().findFragmentById(R.id.someFragmentId);
OriginalListFragment originalFragment = new OriginalListFragment();
fragment.init(this, originalFragment);

// now access originalFragment.getListAdapter() to modify list entries
// and remember to call notifyDatasetChanged()

How to scroll to bottom in react?

import React, {Component} from 'react';

export default class ChatOutPut extends Component {

    constructor(props) {
        super(props);
        this.state = {
            messages: props.chatmessages
        };
    }
    componentDidUpdate = (previousProps, previousState) => {
        if (this.refs.chatoutput != null) {
            this.refs.chatoutput.scrollTop = this.refs.chatoutput.scrollHeight;
        }
    }
    renderMessage(data) {
        return (
            <div key={data.key}>
                {data.message}
            </div>
        );
    }
    render() {
        return (
            <div ref='chatoutput' className={classes.chatoutputcontainer}>
                {this.state.messages.map(this.renderMessage, this)}
            </div>
        );
    }
}

Select 2 columns in one and combine them

I hope this answer helps:

SELECT (CAST(id AS NVARCHAR)+','+name) AS COMBINED_COLUMN FROM TABLENAME;

What is "stdafx.h" used for in Visual Studio?

"Stdafx.h" is a precompiled header.It include file for standard system include files and for project-specific include files that are used frequently but are changed infrequently.which reduces compile time and Unnecessary Processing.

Precompiled Header stdafx.h is basically used in Microsoft Visual Studio to let the compiler know the files that are once compiled and no need to compile it from scratch. You can read more about it

http://www.cplusplus.com/articles/1TUq5Di1/

https://docs.microsoft.com/en-us/cpp/ide/precompiled-header-files?view=vs-2017

How do I run a Python script from C#?

Just also to draw your attention to this:

https://code.msdn.microsoft.com/windowsdesktop/C-and-Python-interprocess-171378ee

It works great.

Git Commit Messages: 50/72 Formatting

Is the maximum recommended title length really 50?

I have believed this for years, but as I just noticed the documentation of "git commit" actually states

$ git help commit | grep -C 1 50
      Though not required, it’s a good idea to begin the commit message with
      a single short (less than 50 character) line summarizing the change,
      followed by a blank line and then a more thorough description. The text

$  git version
git version 2.11.0

One could argue that "less then 50" can only mean "no longer than 49".

How to insert new row to database with AUTO_INCREMENT column without specifying column names?

Even better, use DEFAULT instead of NULL. You want to store the default value, not a NULL that might trigger a default value.

But you'd better name all columns, with a piece of SQL you can create all the INSERT, UPDATE and DELETE's you need. Just check the information_schema and construct the queries you need. There is no need to do it all by hand, SQL can help you out.

Android: Difference between Parcelable and Serializable?

In Android we cannot just pass objects to activities. To do this the objects must either implement Serializable or Parcelable interface.

Serializable

Serializable is a standard Java interface. You can just implement Serializable interface and add override methods. The problem with this approach is that reflection is used and it is a slow process. This method creates a lot of temporary objects and causes quite a bit of garbage collection. However, Serializable interface is easier to implement.

Look at the example below (Serializable):

// MyObjects Serializable class

import java.io.Serializable;
import java.util.ArrayList;
import java.util.TreeMap;

import android.os.Parcel;
import android.os.Parcelable;

public class MyObjects implements Serializable {

    private String name;
    private int age;
    public ArrayList<String> address;

    public MyObjects(String name, int age, ArrayList<String> address) {
        super();
        this.name = name;
        this.age = age;
        this.address = address;
    }

    public ArrayList<String> getAddress() {
        if (!(address == null))
            return address;
        else
            return new ArrayList<String>();
    }

    public String getName() {
        return name;
    }

    public String getAge() {
        return age;
    }
}

// MyObjects instance
MyObjects mObjects = new MyObjects("name", "age", "Address array here");

// Passing MyObjects instance via intent
Intent mIntent = new Intent(FromActivity.this, ToActivity.class);
mIntent.putExtra("UniqueKey", mObjects);
startActivity(mIntent);

// Getting MyObjects instance
Intent mIntent = getIntent();
MyObjects workorder = (MyObjects)    mIntent.getSerializableExtra("UniqueKey");

Parcelable

Parcelable process is much faster than Serializable. One of the reasons for this is that we are being explicit about the serialization process instead of using reflection to infer it. It also stands to reason that the code has been heavily optimized for this purpose.

Look at the example below (Parcelable):

// MyObjects Parcelable class

import java.util.ArrayList;

import android.os.Parcel;
import android.os.Parcelable;

public class MyObjects implements Parcelable {

    private int age;
    private String name;
    private ArrayList<String> address;

    public MyObjects(String name, int age, ArrayList<String> address) {
        this.name = name;
        this.age = age;
        this.address = address;
    }

    public MyObjects(Parcel source) {
        age = source.readInt();
        name = source.readString();
        address = source.createStringArrayList();
    }

    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(age);
        dest.writeString(name);
        dest.writeStringList(address);
    }

    public int getAge() {
        return age;
    }

    public String getName() {
        return name;
    }

    public ArrayList<String> getAddress() {
        if (!(address == null))
            return address;
        else
            return new ArrayList<String>();
    }

    public static final Creator<MyObjects> CREATOR = new Creator<MyObjects>() {
        @Override
        public MyObjects[] newArray(int size) {
            return new MyObjects[size];
        }

        @Override
        public MyObjects createFromParcel(Parcel source) {
            return new MyObjects(source);
        }
    };
}

// MyObjects instance
MyObjects mObjects = new MyObjects("name", "age", "Address array here");

// Passing MyOjects instance
Intent mIntent = new Intent(FromActivity.this, ToActivity.class);
mIntent.putExtra("UniqueKey", mObjects);
startActivity(mIntent);

// Getting MyObjects instance
Intent mIntent = getIntent();
MyObjects workorder = (MyObjects) mIntent.getParcelableExtra("UniqueKey");

You can pass ArrayList of Parcelable objects as below:

// Array of MyObjects
ArrayList<MyObjects> mUsers;

// Passing MyOjects instance
Intent mIntent = new Intent(FromActivity.this, ToActivity.class);
mIntent.putParcelableArrayListExtra("UniqueKey", mUsers);
startActivity(mIntent);

// Getting MyObjects instance
Intent mIntent = getIntent();
ArrayList<MyObjects> mUsers = mIntent.getParcelableArrayList("UniqueKey");

Conclusion

Parcelable is faster than Serializable interface
Parcelable interface takes more time to implement compared to Serializable interface
Serializable interface is easier to implement
Serializable interface creates a lot of temporary objects and causes quite a bit of garbage collection
Parcelable array can be passed via Intent in android

onclick or inline script isn't working in extension

Reason

This does not work, because Chrome forbids any kind of inline code in extensions via Content Security Policy.

Inline JavaScript will not be executed. This restriction bans both inline <script> blocks and inline event handlers (e.g. <button onclick="...">).

How to detect

If this is indeed the problem, Chrome would produce the following error in the console:

Refused to execute inline script because it violates the following Content Security Policy directive: "script-src 'self' chrome-extension-resource:". Either the 'unsafe-inline' keyword, a hash ('sha256-...'), or a nonce ('nonce-...') is required to enable inline execution.

To access a popup's JavaScript console (which is useful for debug in general), right-click your extension's button and select "Inspect popup" from the context menu.

More information on debugging a popup is available here.

How to fix

One needs to remove all inline JavaScript. There is a guide in Chrome documentation.

Suppose the original looks like:

<a onclick="handler()">Click this</a> <!-- Bad -->

One needs to remove the onclick attribute and give the element a unique id:

<a id="click-this">Click this</a> <!-- Fixed -->

And then attach the listener from a script (which must be in a .js file, suppose popup.js):

// Pure JS:
document.addEventListener('DOMContentLoaded', function() {
  document.getElementById("click-this").addEventListener("click", handler);
});

// The handler also must go in a .js file
function handler() {
  /* ... */
}

Note the wrapping in a DOMContentLoaded event. This ensures that the element exists at the time of execution. Now add the script tag, for instance in the <head> of the document:

<script src="popup.js"></script>

Alternative if you're using jQuery:

// jQuery
$(document).ready(function() {
  $("#click-this").click(handler);
});

Relaxing the policy

Q: The error mentions ways to allow inline code. I don't want to / can't change my code, how do I enable inline scripts?

A: Despite what the error says, you cannot enable inline script:

There is no mechanism for relaxing the restriction against executing inline JavaScript. In particular, setting a script policy that includes 'unsafe-inline' will have no effect.

Update: Since Chrome 46, it's possible to whitelist specific inline code blocks:

As of Chrome 46, inline scripts can be whitelisted by specifying the base64-encoded hash of the source code in the policy. This hash must be prefixed by the used hash algorithm (sha256, sha384 or sha512). See Hash usage for <script> elements for an example.

However, I do not readily see a reason to use this, and it will not enable inline attributes like onclick="code".

How to make the main content div fill height of screen with css

Not sure exactly what your after, but I think I get it.

A header - stays at the top of the screen? A footer - stays at the bottom of the screen? Content area -> fits the space between the footer and the header?

You can do this by absolute positioning or with fixed positioning.

Here is an example with absolute positioning: http://jsfiddle.net/FMYXY/1/

Markup:

<div class="header">Header</div>
<div class="mainbody">Main Body</div>
<div class="footer">Footer</div>

CSS:

.header {outline:1px solid red; height: 40px; position:absolute; top:0px; width:100%;}
.mainbody {outline:1px solid green; min-height:200px; position:absolute; top:40px; width:100%; height:90%;}
.footer {outline:1px solid blue; height:20px; position:absolute; height:25px;bottom:0; width:100%; }

To make it work best, I'd suggest using % instead of pixels, as you will run into problems with different screen/device sizes.

Convert string to decimal number with 2 decimal places in Java

litersOfPetrol = Float.parseFloat(df.format(litersOfPetrol));

System.out.println("liters of petrol before putting in editor : "+litersOfPetrol);

You print Float here, that has no format at all.

To print formatted float, just use

String formatted = df.format(litersOfPetrol);
System.out.println("liters of petrol before putting in editor : " + formatted);

Vertical align in bootstrap table

SCSS

.table-vcenter {
    td,
    th {
        vertical-align: middle;
    }
}

use

<table class="table table-vcenter">
</table>

Proper way to declare custom exceptions in modern Python?

See a very good article "The definitive guide to Python exceptions". The basic principles are:

Always inherit from (at least) Exception.
Always call BaseException.__init__ with only one argument.
When building a library, define a base class inheriting from Exception.
Provide details about the error.
Inherit from builtin exceptions types when it makes sense.

There is also information on organizing (in modules) and wrapping exceptions, I recommend to read the guide.

Calculate date from week number

I improved a little on Thomas' solution with an override:

   public static DateTime FirstDateOfWeek(int year, int weekOfYear)
    {
      return Timer.FirstDateOfWeekOfMonth(year, 1, weekOfYear);
    }

    public static DateTime FirstDateOfWeekOfMonth(int year, int month, 
    int weekOfYear)
    {
      DateTime dtFirstDayOfMonth = new DateTime(year, month, 1);

       //I also commented out this part:
      /*
      if (firstWeek <= 1)
      {
        weekOfYear -= 1;
      }
      */

Otherwise the date was preceding by one week..

Thank you Thomas, great help.

MySQL select one column DISTINCT, with corresponding other columns

SELECT firstName, ID, LastName from tableName GROUP BY firstName

Passing parameters to a JQuery function

<script type="text/javascript" src="jquery.js">
</script>

 <script type="text/javascript">

  function omtCallFromAjax(urlVariable)
{ 
    alert("omt:"+urlVariable);
     $("#omtDiv").load("omtt.php?"+urlVariable);
}

 </script>

try this it work for me

What does the SQL Server Error "String Data, Right Truncation" mean and how do I fix it?

I got around the issue by using a convert on the "?", so my code looks like convert(char(50),?) and that got rid of the truncation error.

How to quickly and conveniently create a one element arraylist

Collections.singletonList(object)

the list created by this method is immutable.

How to use the toString method in Java?

The main purpose of toString is to generate a String representation of an object, means the return value is always a String. In most cases this simply is the object's class and package name, but on some cases like StringBuilder you will got actually a String-text.

How to delete all the rows in a table using Eloquent?

In a similar vein to Travis vignon's answer, I required data from the eloquent model, and if conditions were correct, I needed to either delete or update the model. I wound up getting the minimum and maximum I'd field returned by my query (in case another field was added to the table that would meet my selection criteria) along with the original selection criteria to update the fields via one raw SQL query (as opposed to one eloquent query per object in the collection).

I know the use of raw SQL violates laravels beautiful code philosophy, but itd be hard to stomach possibly hundreds of queries in place of one.

Is there a "not equal" operator in Python?

You can use "is not" for "not equal" or "!=". Please see the example below:

a = 2
if a == 2:
   print("true")
else:
   print("false")

The above code will print "true" as a = 2 assigned before the "if" condition. Now please see the code below for "not equal"

a = 2
if a is not 3:
   print("not equal")
else:
   print("equal")

The above code will print "not equal" as a = 2 as assigned earlier.

Replacing spaces with underscores in JavaScript?

Try .replace(/ /g,"_");

Edit: or .split(' ').join('_') if you have an aversion to REs

Edit: John Resig said:

If you're searching and replacing through a string with a static search and a static replace it's faster to perform the action with .split("match").join("replace") - which seems counter-intuitive but it manages to work that way in most modern browsers. (There are changes going in place to grossly improve the performance of .replace(/match/g, "replace") in the next version of Firefox - so the previous statement won't be the case for long.)

How to generate classes from wsdl using Maven and wsimport?

Even though this is bit late response, may be helpful for someone. Look like you have used pluginManagement. If you use pluginManagement , it will not pick the plug-in execution.

It should be under

<build>
<plugins>           
        <plugin>

What is <=> (the 'Spaceship' Operator) in PHP 7?

The <=> ("Spaceship") operator will offer combined comparison in that it will :

Return 0 if values on either side are equal
Return 1 if the value on the left is greater
Return -1 if the value on the right is greater

The rules used by the combined comparison operator are the same as the currently used comparison operators by PHP viz. <, <=, ==, >= and >. Those who are from Perl or Ruby programming background may already be familiar with this new operator proposed for PHP7.

   //Comparing Integers

    echo 1 <=> 1; //output  0
    echo 3 <=> 4; //output -1
    echo 4 <=> 3; //output  1

    //String Comparison

    echo "x" <=> "x"; //output  0
    echo "x" <=> "y"; //output -1
    echo "y" <=> "x"; //output  1

Doctrine query builder using inner join with conditions

You can explicitly have a join like this:

$qb->innerJoin('c.phones', 'p', Join::ON, 'c.id = p.customerId');

But you need to use the namespace of the class Join from doctrine:

use Doctrine\ORM\Query\Expr\Join;

Or if you prefere like that:

$qb->innerJoin('c.phones', 'p', Doctrine\ORM\Query\Expr\Join::ON, 'c.id = p.customerId');

Otherwise, Join class won't be detected and your script will crash...

Here the constructor of the innerJoin method:

public function innerJoin($join, $alias, $conditionType = null, $condition = null);

You can find other possibilities (not just join "ON", but also "WITH", etc...) here: http://docs.doctrine-project.org/en/2.0.x/reference/query-builder.html#the-expr-class

EDIT

Think it should be:

$qb->select('c')
    ->innerJoin('c.phones', 'p', Join::ON, 'c.id = p.customerId')
    ->where('c.username = :username')
    ->andWhere('p.phone = :phone');

    $qb->setParameters(array(
        'username' => $username,
        'phone' => $phone->getPhone(),
    ));

Otherwise I think you are performing a mix of ON and WITH, perhaps the problem.

Purpose of returning by const value?

It's pretty pointless to return a const value from a function.

It's difficult to get it to have any effect on your code:

const int foo() {
   return 3;
}

int main() {
   int x = foo();  // copies happily
   x = 4;
}

and:

const int foo() {
   return 3;
}

int main() {
   foo() = 4;  // not valid anyway for built-in types
}

// error: lvalue required as left operand of assignment

Though you can notice if the return type is a user-defined type:

struct T {};

const T foo() {
   return T();
}

int main() {
   foo() = T();
}

// error: passing ‘const T’ as ‘this’ argument of ‘T& T::operator=(const T&)’ discards qualifiers

it's questionable whether this is of any benefit to anyone.

Returning a reference is different, but unless Object is some template parameter, you're not doing that.

Connecting to local SQL Server database using C#

SqlConnection c = new SqlConnection(@"Data Source=localhost; 
                           Initial Catalog=Northwind; Integrated Security=True");

Can Python test the membership of multiple values in a list?

If you want to check all of your input matches,

>>> all(x in ['b', 'a', 'foo', 'bar'] for x in ['a', 'b'])

if you want to check at least one match,

>>> any(x in ['b', 'a', 'foo', 'bar'] for x in ['a', 'b'])

Why does dividing two int not yield the right value when assigned to double?

The / operator can be used for integer division or floating point division. You're giving it two integer operands, so it's doing integer division and then the result is being stored in a double.

angularjs to output plain text instead of html

from https://docs.angularjs.org/api/ng/function/angular.element

angular.element

wraps a raw DOM element or HTML string as a jQuery element (If jQuery is not available, angular.element delegates to Angular's built-in subset of jQuery, called "jQuery lite" or "jqLite.")

So you simply could do:

angular.module('myApp.filters', []).
  filter('htmlToPlaintext', function() {
    return function(text) {
      return angular.element(text).text();
    }
  }
);

Usage:

<div>{{myText | htmlToPlaintext}}</div>

nginx error connect to php5-fpm.sock failed (13: Permission denied)

In fact, "listen.mode" should be: "0660" and not "0666" as Other Writable or Other Readable is never a good choice here.

So try to find out as which user/group your webserver runs. I use CentOs and it runs as user "nginx" So add to your php-fpm.conf:

listen.owner = nginx
listen.group = nginx
listen.mode = 0660

finally restart php-fpm

Command-line Git on Windows

These instructions worked for a Windows 8 with a msysgit/TortoiseGit installation, but should be applicable for other types of git installations on Windows.

Go to Control Panel\System and Security\System
Click on Advanced System Settings on the left which opens System Properties.
Click on the Advanced Tab
Click on the Environment Variables button at the bottom of the dialog box.
Edit the System Variable called PATH.
Append these two paths to the list of existing paths already present in the system variable. The tricky part was two paths were required. These paths may vary for your PC. ;C:\msysgit\bin\;C:\msysgit\mingw\bin\
Close the CMD prompt window if it is open already. CMD needs to restart to get the updated Path variable.
Try typing git in the command line, you should see a list of the git commands scroll down the screen.

Reload parent window from child window

this will work

window.location.assign(window.location.href);

Pythonic way to check if something exists?

Min/Max-value validators in asp.net mvc

Here is how I would write a validator for MaxValue

public class MaxValueAttribute : ValidationAttribute
    {
        private readonly int _maxValue;

        public MaxValueAttribute(int maxValue)
        {
            _maxValue = maxValue;
        }

        public override bool IsValid(object value)
        {
            return (int) value <= _maxValue;
        }
    }

The MinValue Attribute should be fairly the same

"Connect failed: Access denied for user 'root'@'localhost' (using password: YES)" from php function

I had this problem too. But this was because of another reason. My password began with character $... e.g. $MyPassword I've changed it to #MyPassword and the problem is solved.

Why use ICollection and not IEnumerable or List<T> on many-many/one-many relationships?

There are some basics difference between ICollection and IEnumerable

IEnumerable - contains only GetEnumerator method to get Enumerator and allows looping
ICollection contains additional methods: Add, Remove, Contains, Count, CopyTo
ICollection is inherited from IEnumerable
With ICollection you can modify the collection by using the methods like add/remove. You don't have the liberty to do the same with IEnumerable.

Simple Program:

using System;
using System.Collections;
using System.Collections.Generic;

namespace StackDemo
{
    class Program 
    {
        static void Main(string[] args)
        {
            List<Person> persons = new List<Person>();
            persons.Add(new Person("John",30));
            persons.Add(new Person("Jack", 27));

            ICollection<Person> personCollection = persons;
            IEnumerable<Person> personEnumeration = persons;

            // IEnumeration
            // IEnumration Contains only GetEnumerator method to get Enumerator and make a looping
            foreach (Person p in personEnumeration)
            {                                   
               Console.WriteLine("Name:{0}, Age:{1}", p.Name, p.Age);
            }

            // ICollection
            // ICollection Add/Remove/Contains/Count/CopyTo
            // ICollection is inherited from IEnumerable
            personCollection.Add(new Person("Tim", 10));

            foreach (Person p in personCollection)
            {
                Console.WriteLine("Name:{0}, Age:{1}", p.Name, p.Age);        
            }
            Console.ReadLine();

        }
    }

    class Person
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public Person(string name, int age)
        {
            this.Name = name;
            this.Age = age;
        }
    }
}

Creating watermark using html and css

Other solutions are great but they didn't take care of the fact that watermark shouldn't get selected on selection from the mouse. This fiddle takes care or that: https://jsfiddle.net/MiKr13/d1r4o0jg/9/

This will be better option for pdf or static html.

CSS:

#watermark {
  opacity: 0.2;
  font-size: 52px;
  color: 'black';
  background: '#ccc';
  position: absolute;
  cursor: default;
  user-select: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  right: 5px;
  bottom: 5px;
}

How do I restart nginx only after the configuration test was successful on Ubuntu?

You can reload using /etc/init.d/nginx reload and sudo service nginx reload

If nginx -t throws some error then it won't reload

so use && to run both at a same time

nginx -t && /etc/init.d/nginx reload

How do I parse JSON in Android?

Android has all the tools you need to parse json built-in. Example follows, no need for GSON or anything like that.

Get your JSON:

Assume you have a json string

String result = "{\"someKey\":\"someValue\"}";

Create a JSONObject:

JSONObject jObject = new JSONObject(result);

If your json string is an array, e.g.:

String result = "[{\"someKey\":\"someValue\"}]"

then you should use JSONArray as demonstrated below and not JSONObject

To get a specific string

String aJsonString = jObject.getString("STRINGNAME");

To get a specific boolean

boolean aJsonBoolean = jObject.getBoolean("BOOLEANNAME");

To get a specific integer

int aJsonInteger = jObject.getInt("INTEGERNAME");

To get a specific long

long aJsonLong = jObject.getLong("LONGNAME");

To get a specific double

double aJsonDouble = jObject.getDouble("DOUBLENAME");

To get a specific JSONArray:

JSONArray jArray = jObject.getJSONArray("ARRAYNAME");

To get the items from the array

for (int i=0; i < jArray.length(); i++)
{
    try {
        JSONObject oneObject = jArray.getJSONObject(i);
        // Pulling items from the array
        String oneObjectsItem = oneObject.getString("STRINGNAMEinTHEarray");
        String oneObjectsItem2 = oneObject.getString("anotherSTRINGNAMEINtheARRAY");
    } catch (JSONException e) {
        // Oops
    }
}

How do I alter the position of a column in a PostgreSQL database table?

"Alter column position" in the PostgreSQL Wiki says:

PostgreSQL currently defines column order based on the attnum column of the pg_attribute table. The only way to change column order is either by recreating the table, or by adding columns and rotating data until you reach the desired layout.

That's pretty weak, but in their defense, in standard SQL, there is no solution for repositioning a column either. Database brands that support changing the ordinal position of a column are defining an extension to SQL syntax.

One other idea occurs to me: you can define a VIEW that specifies the order of columns how you like it, without changing the physical position of the column in the base table.

How to set an button align-right with Bootstrap?

This worked for me:

<div class="text-right">
    <button type="button">Button 1</button>
    <button type="button">Button 2</button>
</div>

Control the size of points in an R scatterplot?

Try the cex argument:

?par

cex
A numerical value giving the amount by which plotting text and symbols should be magnified relative to the default. Note that some graphics functions such as plot.default have an argument of this name which multiplies this graphical parameter, and some functions such as points accept a vector of values which are recycled. Other uses will take just the first value if a vector of length greater than one is supplied.

Insert image after each list item

Try this:

ul li a:after {
    display: block;
    content: "";
    width: 3px;
    height: 5px;
    background: transparent url('../images/small_triangle.png') no-repeat;
}

You need the content: ""; declaration to give your generated element content, even if that content is "nothing".

Also, I fixed the syntax/ordering of your background declaration.

How to Find the Default Charset/Encoding in Java?

Is this a bug or feature?

Looks like undefined behaviour. I know that, in practice, you can change the default encoding using a command-line property, but I don't think what happens when you do this is defined.

Bug ID: 4153515 on problems setting this property:

This is not a bug. The "file.encoding" property is not required by the J2SE platform specification; it's an internal detail of Sun's implementations and should not be examined or modified by user code. It's also intended to be read-only; it's technically impossible to support the setting of this property to arbitrary values on the command line or at any other time during program execution.

The preferred way to change the default encoding used by the VM and the runtime system is to change the locale of the underlying platform before starting your Java program.

I cringe when I see people setting the encoding on the command line - you don't know what code that is going to affect.

If you do not want to use the default encoding, set the encoding you do want explicitly via the appropriate method/constructor.

Why use @Scripts.Render("~/bundles/jquery")

You can also use:

@Scripts.RenderFormat("<script type=\"text/javascript\" src=\"{0}\"></script>", "~/bundles/mybundle")

To specify the format of your output in a scenario where you need to use Charset, Type, etc.

Creating an empty list in Python

list() is inherently slower than [], because

there is symbol lookup (no way for python to know in advance if you did not just redefine list to be something else!),
there is function invocation,
then it has to check if there was iterable argument passed (so it can create list with elements from it) ps. none in our case but there is "if" check

In most cases the speed difference won't make any practical difference though.

Calling a Sub in VBA

Try -

Call CatSubProduktAreakum(Stattyp, Daty + UBound(SubCategories) + 2)

As for the reason, this from MSDN via this question - What does the Call keyword do in VB6?

You are not required to use the Call keyword when calling a procedure. However, if you use the Call keyword to call a procedure that requires arguments, argumentlist must be enclosed in parentheses. If you omit the Call keyword, you also must omit the parentheses around argumentlist. If you use either Call syntax to call any intrinsic or user-defined function, the function's return value is discarded.

Rewrite left outer join involving multiple tables from Informix to Oracle

I'm guessing that you want something like

SELECT tab1.a, tab2.b, tab3.c, tab4.d
  FROM table1 tab1 
       JOIN table2 tab2 ON (tab1.fg = tab2.fg)
       LEFT OUTER JOIN table4 tab4 ON (tab1.ss = tab4.ss)
       LEFT OUTER JOIN table3 tab3 ON (tab4.xya = tab3.xya and tab3.desc = 'XYZ')
       LEFT OUTER JOIN table5 tab5 on (tab4.kk = tab5.kk AND
                                       tab3.dd = tab5.dd)

Convert pandas data frame to series

You can retrieve the series through slicing your dataframe using one of these two methods:

http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.iloc.html http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.loc.html

import pandas as pd
import numpy as np
df = pd.DataFrame(data=np.random.randn(1,8))

series1=df.iloc[0,:]
type(series1)
pandas.core.series.Series

insert datetime value in sql database with c#

INSERT INTO <table> (<date_column>) VALUES ('1/1/2010 12:00')

Perl read line by line

#!/usr/bin/perl
use utf8                       ;
use 5.10.1                     ;
use strict                     ;
use autodie                    ;
use warnings FATAL => q  ?all?;
binmode STDOUT     => q ?:utf8?;                  END {
close   STDOUT                 ;                     }
our    $FOLIO      =  q + SnPmaster.txt +            ;
open    FOLIO                  ;                 END {
close   FOLIO                  ;                     }
binmode FOLIO      => q{       :crlf
                               :encoding(CP-1252)    };
while (<FOLIO>)  { print       ;                     }
       continue  { ${.} ^015^  __LINE__  ||   exit   }
                                                                                                                                                                                                                                              __END__
unlink  $FOLIO                 ;
unlink ~$HOME ||
  clri ~$HOME                  ;
reboot                         ;

HTTP Status 405 - HTTP method POST is not supported by this URL java servlet

It's because you're calling doGet() without actually implementing doGet(). It's the default implementation of doGet() that throws the error saying the method is not supported.

Python CSV error: line contains NULL byte

This happened to me when I created a CSV file with OpenOffice Calc. It didn't happen when I created the CSV file in my text editor, even if I later edited it with Calc.

I solved my problem by copy-pasting in my text editor the data from my Calc-created file to a new editor-created file.

How to get status code from webclient?

You can check if the error is of type WebException and then inspect the response code;

if (e.Error.GetType().Name == "WebException")
{
   WebException we = (WebException)e.Error;
   HttpWebResponse response = (System.Net.HttpWebResponse)we.Response;
   if (response.StatusCode==HttpStatusCode.NotFound)
      System.Diagnostics.Debug.WriteLine("Not found!");
}

try
{
    // send request
}
catch (WebException e)
{
    // check e.Status as above etc..
}

Correct way to detach from a container without stopping it

You can use the --detach-keys option when you run docker attach to override the default CTRL+P, CTRL + Q sequence (that doesn't always work).

For example, when you run docker attach --detach-keys="ctrl-a" test and you press CTRL+A you will exit the container, without killing it.

Other examples:

docker attach --detach-keys="ctrl-a,x" test - press CTRL+A and then X to exit
docker attach --detach-keys="a,b,c" test - press A, then B, then C to exit

Extract from the official documentation:

If you want, you can configure an override the Docker key sequence for detach. This is useful if the Docker default sequence conflicts with key sequence you use for other applications. There are two ways to define your own detach key sequence, as a per-container override or as a configuration property on your entire configuration.

To override the sequence for an individual container, use the --detach-keys="<sequence>" flag with the docker attach command. The format of the <sequence> is either a letter [a-Z], or the ctrl- combined with any of the following:

a-z (a single lowercase alpha character )
@ (at sign)
[ (left bracket)
\ (two backward slashes)
_ (underscore)
^ (caret)

These a, ctrl-a, X, or ctrl-\\ values are all examples of valid key sequences. To configure a different configuration default key sequence for all containers, see Configuration file section.

Note: This works since docker version 1.10+ (at the time of this answer, the current version is 18.03)

Set opacity of background image without affecting child elements

#footer ul li
     {
       position:relative;
       list-style:none;
     }
    #footer ul li:before
     {
       background-image: url(imagesFolder/bg_demo.png);
       background-repeat:no-repeat;
       content: "";
       top: 5px;
       left: -10px;
       bottom: 0;
       right: 0;
       position: absolute;
       z-index: -1;
       opacity: 0.5;
    }

You can try this code. I think it will be worked. You can visit the demo

importing a CSV into phpmyadmin

This is happen due to the id(auto increment filed missing). If you edit it in a text editor by adding a comma for the ID field this will be solved.

How to set array length in c# dynamically

Does is need to be an array? If you use an ArrayList or one of the other objects available in C#, you won't have this limitation to content with. Hashtable, IDictionnary, IList, etc.. all allow a dynamic number of elements.

User GETDATE() to put current date into SQL variable

Just use GetDate() not Select GetDate()

DECLARE @LastChangeDate as date 
SET @LastChangeDate = GETDATE()

but if it's SQL Server, you can also initialize in same step as declaration...

DECLARE @LastChangeDate date = getDate()

Android findViewById() in Custom View

You can try something like this:

Inside customview constructor:

mContext = context;

Next inside customview you can call:

((MainActivity) mContext).updateText( text );

Inside MainAcivity define:

public void updateText(final String text) {

     TextView txtView = (TextView) findViewById(R.id.text);
     txtView.setText(text);
}

It works for me.

What is the meaning of CTOR?

Usually this region should contains the constructors of the class

How to use function srand() with time.h?

Try to call randomize() before rand() to initialize random generator.

(look at: srand() — why call it only once?)

Render HTML to PDF in Django site

https://github.com/nigma/django-easy-pdf

Template:

{% extends "easy_pdf/base.html" %}

{% block content %}
    <div id="content">
        <h1>Hi there!</h1>
    </div>
{% endblock %}

View:

from easy_pdf.views import PDFTemplateView

class HelloPDFView(PDFTemplateView):
    template_name = "hello.html"

If you want to use django-easy-pdf on Python 3 check the solution suggested here.

Connect to docker container as user other than root

This solved my use case that is: "Compile webpack stuff in nodejs container on Windows running Docker Desktop with WSL2 and have the built assets under your currently logged in user."

docker run -u 1000 -v "$PWD":/build -w /build node:10.23 /bin/sh -c 'npm install && npm run build'

Based on the answer by eigenfield. Thank you!

Also this material helped me understand what is going on.

Read a file line by line assigning the value to a variable

#! /bin/bash
cat filename | while read LINE; do
    echo $LINE
done

How can I determine browser window size on server side C#

You can use Javascript to get the viewport width and height. Then pass the values back via a hidden form input or ajax.

At its simplest

var width = $(window).width();
var height = $(window).height();

Complete method using hidden form inputs

Assuming you have: JQuery framework.

First, add these hidden form inputs to store the width and height until postback.

<asp:HiddenField ID="width" runat="server" />
<asp:HiddenField ID="height" runat="server" />

Next we want to get the window (viewport) width and height. JQuery has two methods for this, aptly named width() and height().

Add the following code to your .aspx file within the head element.

<script type="text/javascript">
$(document).ready(function() {

    $("#width").val() = $(window).width();
    $("#height").val() = $(window).height();    

});
</script>

Result

This will result in the width and height of the browser window being available on postback. Just access the hidden form inputs like this:

var TheBrowserWidth = width.Value;
var TheBrowserHeight = height.Value;

This method provides the height and width upon postback, but not on the intial page load.

Note on UpdatePanels: If you are posting back via UpdatePanels, I believe the hidden inputs need to be within the UpdatePanel.

Alternatively you can post back the values via an ajax call. This is useful if you want to react to window resizing.

Update for jquery 3.1.1

I had to change the JavaScript to:

$("#width").val($(window).width());
$("#height").val($(window).height());

How to get < span > value?

var test = document.getElementById( 'test' );

// To get the text only, you can use "textContent"
console.log( test.textContent ); // "1 2 3 4"

textContent is the standard way. innerText is the property to use for legacy IE. If you want something as cross browser as possible, recursively use nodeValue.

ArrayBuffer to base64 encoded string

function _arrayBufferToBase64(uarr) {
    var strings = [], chunksize = 0xffff;
    var len = uarr.length;

    for (var i = 0; i * chunksize < len; i++){
        strings.push(String.fromCharCode.apply(null, uarr.subarray(i * chunksize, (i + 1) * chunksize)));
    }

    return strings.join("");
}

This is better, if you use JSZip for unpack archive from string

How do I decode a base64 encoded string?

Simple:

byte[] data = Convert.FromBase64String(encodedString);
string decodedString = Encoding.UTF8.GetString(data);

'int' object has no attribute 'getitem'

I had a similar issue recently while working on recursion and nested lists. I declared:

print(r_sum([1,2,3[1,2,3],]))

instead of

print(r_sum([1,2,3,[1,2,3],]))

Note the comma after the number 3

Generating a WSDL from an XSD file

This tool xsd2wsdl part of the Apache CXF project which will generate a minimalist WSDL.

Oracle: How to filter by date and time in a where clause

Obviously '12/01/2012 13:16:32.000' doesn't match 'DD-MON-YYYY hh24:mi' format.

Update:

You need 'MM/DD/YYYY hh24:mi:ss.ff' format and to use TO_TIMESTAMP instead of TO_DATE cause dates don't hold millis in oracle.

How many concurrent requests does a single Flask process receive?

No- you can definitely handle more than that.

Its important to remember that deep deep down, assuming you are running a single core machine, the CPU really only runs one instruction* at a time.

Namely, the CPU can only execute a very limited set of instructions, and it can't execute more than one instruction per clock tick (many instructions even take more than 1 tick).

Therefore, most concurrency we talk about in computer science is software concurrency. In other words, there are layers of software implementation that abstract the bottom level CPU from us and make us think we are running code concurrently.

These "things" can be processes, which are units of code that get run concurrently in the sense that each process thinks its running in its own world with its own, non-shared memory.

Another example is threads, which are units of code inside processes that allow concurrency as well.

The reason your 4 worker processes will be able to handle more than 4 requests is that they will fire off threads to handle more and more requests.

The actual request limit depends on HTTP server chosen, I/O, OS, hardware, network connection etc.

Good luck!

*instructions are the very basic commands the CPU can run. examples - add two numbers, jump from one instruction to another

Show a message box from a class in c#?

System.Windows.MessageBox.Show("Hello world"); //WPF
System.Windows.Forms.MessageBox.Show("Hello world"); //WinForms

Remove columns from DataTable in C#

The question has already been marked as answered, But I guess the question states that the person wants to remove multiple columns from a DataTable.

So for that, here is what I did, when I came across the same problem.

string[] ColumnsToBeDeleted = { "col1", "col2", "col3", "col4" };

foreach (string ColName in ColumnsToBeDeleted)
{
    if (dt.Columns.Contains(ColName))
        dt.Columns.Remove(ColName);
}

getting the ng-object selected with ng-change

Instead of setting the ng-model to item.size.code, how about setting it to size:

<select ng-options="size as size.name for size in sizes" 
   ng-model="item" ng-change="update()"></select>

Then in your update() method, $scope.item will be set to the currently selected item.

And whatever code needed item.size.code, can get that property via $scope.item.code.

Fiddle.

Update based on more info in comments:

Use some other $scope property for your select ng-model then:

<select ng-options="size as size.name for size in sizes" 
   ng-model="selectedItem" ng-change="update()"></select>

Controller:

$scope.update = function() {
   $scope.item.size.code = $scope.selectedItem.code
   // use $scope.selectedItem.code and $scope.selectedItem.name here
   // for other stuff ...
}

Two's Complement in Python

Unfortunately there is no built-in function to cast an unsigned integer to a two's complement signed value, but we can define a function to do so using bitwise operations:

def s12(value):
    return -(value & 0b100000000000) | (value & 0b011111111111)

The first bitwise-and operation is used to sign-extend negative numbers (most significant bit is set), while the second is used to grab the remaining 11 bits. This works since integers in Python are treated as arbitrary precision two's complement values.

You can then combine this with the int function to convert a string of binary digits into the unsigned integer form, then interpret it as a 12-bit signed value.

>>> s12(int('111111111111', 2))
-1
>>> s12(int('011111111111', 2))
2047
>>> s12(int('100000000000', 2))
-2048

One nice property of this function is that it's idempotent, thus the value of an already signed value will not change.

>>> s12(-1)
-1

Vertical Alignment of text in a table cell

valign="top" should do the work.

_x000D_

<tr>_x000D_
  <td valign="top">Description</td>_x000D_
</tr>

_x000D_

Styling input radio with css

Here is simple example of how you can do this.

Just replace the image file and you are done.

HTML Code

<input type="radio" id="r1" name="rr" />
<label for="r1"><span></span>Radio Button 1</label>
<p>
<input type="radio" id="r2" name="rr" />
<label for="r2"><span></span>Radio Button 2</label>

CSS

input[type="radio"] {
    display:none;
}

input[type="radio"] + label {
    color:#f2f2f2;
    font-family:Arial, sans-serif;
    font-size:14px;
}

input[type="radio"] + label span {
    display:inline-block;
    width:19px;
    height:19px;
    margin:-1px 4px 0 0;
    vertical-align:middle;
    background:url(check_radio_sheet.png) -38px top no-repeat;
    cursor:pointer;
}

input[type="radio"]:checked + label span {
    background:url(check_radio_sheet.png) -57px top no-repeat;
}

Working DEMO

How can I uninstall Ruby on ubuntu?

Why you are removing old version of the ruby?

rvm install 2.4.2 // version of ruby u need to insatll rvm use 2.4.2 --default // set ruby version you want use by default

Using rvm you can install multiple ruby version in the system

Please follow below steps install ruby using rvm

sudo apt-get install libgdbm-dev libncurses5-dev automake libtool bison libffi-dev
gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 
curl -sSL https://get.rvm.io | bash -s stable 
source ~/.rvm/scripts/rvm
rvm install 2.4.2 
rvm use 2.4.2 --default 
ruby -v

The installation step will change for different Ubuntu version

For more info,

https://gorails.com/setup/ubuntu/14.04

Unable to install Maven on Windows: "JAVA_HOME is set to an invalid directory"

ERROR: JAVA_HOME is set to an invalid directory. JAVA_HOME = "E:\Sun\SDK\jdk\bin" Please set the JAVA_HOME variable in your environment to match the location of your Java installation

JAVA_HOME should be set to E:\Sun\SDK\jdk. PATH should be set to include %JAVA_HOME%\bin.

Fastest JSON reader/writer for C++

rapidjson is a C++ JSON parser/generator designed to be fast and small memory footprint.

There is a performance comparison with YAJL and JsonCPP.

Update:

I created an open source project Native JSON benchmark, which evaluates 29 (and increasing) C/C++ JSON libraries, in terms of conformance and performance. This should be an useful reference.

How to markdown nested list items in Bitbucket?

Even a single space works

...Just open this answer for edit to see it.

Nested lists, deeper levels: ---- leave here an empty row * first level A item - no space in front the bullet character * second level Aa item - 1 space is enough * third level Aaa item - 5 spaces min * second level Ab item - 4 spaces possible too * first level B item

Nested lists, deeper levels:

first level A item - no space in front the bullet character
- second level Aa item - 1 space is enough
  - third level Aaa item - 5 spaces min
- second level Ab item - 4 spaces possible too

first level B item

Nested lists, deeper levels:
 ...Skip a line and indent eight spaces. (as said in the editor-help, just on this page)
* first level A item - no space in front the bullet character
 * second level Aa item - 1 space is enough
     * third level Aaa item - 5 spaces min
    * second level Ab item - 4 spaces possible too
* first level B item

Remove header and footer from window.print()

In Chrome it's possible to hide this automatic header/footer using

@page { margin: 0; }

Since the contents will extend to page's limits, the page printing header/footer will be absent. You should, of course, in this case, set some margins/paddings in your body element so that the content won't extend all the way to the page's edge. Since common printers just can't get no-margins printing and it's probably not what you want, you should use something like this:

@media print {
  @page { margin: 0; }
  body { margin: 1.6cm; }
}

As Martin pointed out in a comment, if the page have a long element that scrolls past one page (like a big table), the margin is ignored and the printed version will look weird.

At the time original of this answer (May 2013), it only worked on Chrome, not sure about it now, never needed to try again. If you need support for a browser that can't hable, you can create a PDF on the fly and print that (you can create a self-printing PDF embedding JavaScript on it), but that's a huge hassle.

I want to truncate a text or line with ellipsis using JavaScript

Try this

function shorten(text, maxLength, delimiter, overflow) {
  delimiter = delimiter || "&hellip;";
  overflow = overflow || false;
  var ret = text;
  if (ret.length > maxLength) {
    var breakpoint = overflow ? maxLength + ret.substr(maxLength).indexOf(" ") : ret.substr(0, maxLength).lastIndexOf(" ");
    ret = ret.substr(0, breakpoint) + delimiter;
  }
  return ret;
}

$(document).ready(function() {
  var $editedText = $("#edited_text");
  var text = $editedText.text();
  $editedText.text(shorten(text, 33, "...", false));
});

Checkout a working sample on Codepen http://codepen.io/Izaias/pen/QbBwwE

Beautiful way to remove GET-variables with PHP?

Another solution... I find this function more elegant, it will also remove the trailing '?' if the key to remove is the only one in the query string.

/**
 * Remove a query string parameter from an URL.
 *
 * @param string $url
 * @param string $varname
 *
 * @return string
 */
function removeQueryStringParameter($url, $varname)
{
    $parsedUrl = parse_url($url);
    $query = array();

    if (isset($parsedUrl['query'])) {
        parse_str($parsedUrl['query'], $query);
        unset($query[$varname]);
    }

    $path = isset($parsedUrl['path']) ? $parsedUrl['path'] : '';
    $query = !empty($query) ? '?'. http_build_query($query) : '';

    return $parsedUrl['scheme']. '://'. $parsedUrl['host']. $path. $query;
}

Tests:

$urls = array(
    'http://www.example.com?test=test',
    'http://www.example.com?bar=foo&test=test2&foo2=dooh',
    'http://www.example.com',
    'http://www.example.com?foo=bar',
    'http://www.example.com/test/no-empty-path/?foo=bar&test=test5',
    'https://www.example.com/test/test.test?test=test6',
);

foreach ($urls as $url) {
    echo $url. '<br/>';
    echo removeQueryStringParameter($url, 'test'). '<br/><br/>';
}

Will output:

http://www.example.com?test=test
http://www.example.com

http://www.example.com?bar=foo&test=test2&foo2=dooh
http://www.example.com?bar=foo&foo2=dooh

http://www.example.com
http://www.example.com

http://www.example.com?foo=bar
http://www.example.com?foo=bar

http://www.example.com/test/no-empty-path/?foo=bar&test=test5
http://www.example.com/test/no-empty-path/?foo=bar

https://www.example.com/test/test.test?test=test6
https://www.example.com/test/test.test

» Run these tests on 3v4l

How to show the last queries executed on MySQL?

SELECT * FROM  mysql.general_log  WHERE command_type ='Query' LIMIT total;

How to compare two floating point numbers in Bash?

please check the below edited code:-

#!/bin/bash

export num1=(3.17648*e-22)
export num2=1.5

st=$((`echo "$num1 < $num2"| bc`))
if [ $st -eq 1 ]
  then
    echo -e "$num1 < $num2"
  else
    echo -e "$num1 >= $num2"
fi

this works well.

If condition inside of map() React

You're mixing if statement with a ternary expression, that's why you're having a syntax error. It might be easier for you to understand what's going on if you extract mapping function outside of your render method:

renderItem = (id) => {
    // just standard if statement
    if (this.props.schema.collectionName.length < 0) {
        return (
            <Expandable>
                <ObjectDisplay
                    key={id}
                    parentDocumentId={id}
                    schema={schema[this.props.schema.collectionName]}
                    value={this.props.collection.documents[id]}
                />
            </Expandable>
        );
    }
    return (
        <h1>hejsan</h1>
    );
}

Then just call it when mapping:

render() {
    return (
        <div>
            <div className="box">
                { 
                    this.props.collection.ids
                        .filter(
                            id =>
                            // note: this is only passed when in top level of document
                            this.props.collection.documents[id][
                                this.props.schema.foreignKey
                            ] === this.props.parentDocumentId
                        )
                        .map(this.renderItem)
                }
            </div>
        </div>
    )
}

Of course, you could have used the ternary expression as well, it's a matter of preference. What you use, however, affects the readability, so make sure to check different ways and tips to properly do conditional rendering in react and react native.

Check whether a path is valid

You can try this code:

try
{
  Path.GetDirectoryName(myPath);
}
catch
{
  // Path is not valid
}

I'm not sure it covers all the cases...

What is the difference between an interface and abstract class?

We have various structural/syntactical difference between interface and abstract class. Some more differences are

[1] Scenario based difference:

Abstract classes are used in scenarios when we want to restrict the user to create object of parent class AND we believe there will be more abstract methods will be added in future.

Interface has to be used when we are sure there can be no more abstract method left to be provided. Then only an interface is published.

[2] Conceptual difference:

"Do we need to provide more abstract methods in future" if YES make it abstract class and if NO make it Interface.

(Most appropriate and valid till java 1.7)

How to call a REST web service API from JavaScript?

Your Javascript:

function UserAction() {
    var xhttp = new XMLHttpRequest();
    xhttp.onreadystatechange = function() {
         if (this.readyState == 4 && this.status == 200) {
             alert(this.responseText);
         }
    };
    xhttp.open("POST", "Your Rest URL Here", true);
    xhttp.setRequestHeader("Content-type", "application/json");
    xhttp.send("Your JSON Data Here");
}

Your Button action::

<button type="submit" onclick="UserAction()">Search</button>

For more info go through the following link (Updated 2017/01/11)

Execute a PHP script from another PHP script

Possible and easiest one-line solution is to use:

file_get_contents("YOUR_REQUESTED_FILE");

Or equivavelt for example CURL.

Check if a Windows service exists and delete in PowerShell

For single PC:

if (Get-Service "service_name" -ErrorAction 'SilentlyContinue'){(Get-WmiObject -Class Win32_Service -filter "Name='service_name'").delete()}

else{write-host "No service found."}

Macro for list of PCs:

$name = "service_name"

$list = get-content list.txt

foreach ($server in $list) {

if (Get-Service "service_name" -computername $server -ErrorAction 'SilentlyContinue'){
(Get-WmiObject -Class Win32_Service -filter "Name='service_name'" -ComputerName $server).delete()}

else{write-host "No service $name found on $server."}

}

What is the list of supported languages/locales on Android?

Arabic, Egypt (ar_EG)
Arabic, Israel (ar_IL)
Bulgarian, Bulgaria (bg_BG)
Catalan, Spain (ca_ES)
Czech, Czech Republic (cs_CZ)
Danish, Denmark(da_DK)
German, Austria (de_AT)
German, Switzerland (de_CH)
German, Germany (de_DE)
German, Liechtenstein (de_LI)
Greek, Greece (el_GR)
English, Australia (en_AU)
English, Canada (en_CA)
English, Britain (en_GB)
English, Ireland (en_IE)
English, India (en_IN)
English, New Zealand (en_NZ)
English, Singapore(en_SG)
English, US (en_US)
English, South Africa (en_ZA)
Spanish (es_ES)
Spanish, US (es_US)
Finnish, Finland (fi_FI)
French, Belgium (fr_BE)
French, Canada (fr_CA)
French, Switzerland (fr_CH)
French, France (fr_FR)
Hebrew, Israel (he_IL)
Hindi, India (hi_IN)
Croatian, Croatia (hr_HR)
Hungarian, Hungary (hu_HU)
Indonesian, Indonesia (id_ID)
Italian, Switzerland (it_CH)
Italian, Italy (it_IT)
Japanese (ja_JP)
Korean (ko_KR)
Lithuanian, Lithuania (lt_LT)
Latvian, Latvia (lv_LV)
Norwegian bokmål, Norway (nb_NO)
Dutch, Belgium (nl_BE)
Dutch, Netherlands (nl_NL)
Polish (pl_PL)
Portuguese, Brazil (pt_BR)
Portuguese, Portugal (pt_PT)
Romanian, Romania (ro_RO)
Russian (ru_RU)
Slovak, Slovakia (sk_SK)
Slovenian, Slovenia (sl_SI)
Serbian (sr_RS)
Swedish, Sweden (sv_SE)
Thai, Thailand (th_TH)
Tagalog, Philippines (tl_PH)
Turkish, Turkey (tr_TR)
Ukrainian, Ukraine (uk_UA)
Vietnamese, Vietnam (vi_VN)
Chinese, PRC (zh_CN)
Chinese, Taiwan (zh_TW)

java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to com.testing.models.Account

The way I could mitigate the JSON Array to collection of LinkedHashMap objects problem was by using CollectionType rather than a TypeReference . This is what I did and worked:

public <T> List<T> jsonArrayToObjectList(String json, Class<T> tClass) throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    CollectionType listType = mapper.getTypeFactory().constructCollectionType(ArrayList.class, tClass);
    List<T> ts = mapper.readValue(json, listType);
    LOGGER.debug("class name: {}", ts.get(0).getClass().getName());
    return ts;
}

Using the TypeReference, I was still getting an ArrayList of LinkedHashMaps, i.e. does not work:

public <T> List<T> jsonArrayToObjectList(String json, Class<T> tClass) throws IOException {
    ObjectMapper mapper = new ObjectMapper();
    List<T> ts = mapper.readValue(json, new TypeReference<List<T>>(){});
    LOGGER.debug("class name: {}", ts.get(0).getClass().getName());
    return ts;
}

Can you center a Button in RelativeLayout?

Its easy, dont Align it to anything

_x000D_

<Button_x000D_
        android:id="@+id/the_button"_x000D_
        android:layout_width="wrap_content"_x000D_
        android:layout_height="wrap_content" _x000D_
        android:layout_centerInParent="true"_x000D_
        android:text="Centered Button"/>

_x000D_

In Java, remove empty elements from a list of Strings

Another way to do this now that we have Java 8 lambda expressions.

arrayList.removeIf(item -> item == null || "".equals(item));

Init function in javascript and how it works

I can't believe no-one has answered the ops question!

The last set of brackets are used for passing in the parameters to the anonymous function. So, the following example creates a function, then runs it with the x=5 and y=8

(function(x,y){
    //code here
})(5,8)

This may seem not so useful, but it has its place. The most common one I have seen is

(function($){
    //code here
})(jQuery)

which allows for jQuery to be in compatible mode, but you can refer to it as "$" within the anonymous function.

How to do perspective fixing?

The simple solution is to just remap coordinates from the original to the final image, copying pixels from one coordinate space to the other, rounding off as necessary -- which may result in some pixels being copied several times adjacent to each other, and other pixels being skipped, depending on whether you're stretching or shrinking (or both) in either dimension. Make sure your copying iterates through the destination space, so all pixels are covered there even if they're painted more than once, rather than thru the source which may skip pixels in the output.

The better solution involves calculating the corresponding source coordinate without rounding, and then using its fractional position between pixels to compute an appropriate average of the (typically) four pixels surrounding that location. This is essentially a filtering operation, so you lose some resolution -- but the result looks a LOT better to the human eye; it does a much better job of retaining small details and avoids creating straight-line artifacts which humans find objectionable.

Note that the same basic approach can be used to remap flat images onto any other shape, including 3D surface mapping.

Show row number in row header of a DataGridView

Based on this viedo: VB.net-Auto generate row number to datagridview in windows application-winforms, you can set the DataSource and this code puts the rows numbers, works like a charm.

private void DataGrid_CellFormatting(object sender, DataGridViewCellFormattingEventArgs e)
{
    // Add row number
    (sender as DataGridView).Rows[e.RowIndex].HeaderCell.Value = (e.RowIndex+1).ToString();
}

Why are you not able to declare a class as static in Java?

Class with private constructor is static.

Declare your class like this:

public class eOAuth {

    private eOAuth(){}

    public final static int    ECodeOauthInvalidGrant = 0x1;
    public final static int    ECodeOauthUnknown       = 0x10;
    public static GetSomeStuff(){}

}

and you can used without initialization:

if (value == eOAuth.ECodeOauthInvalidGrant)
    eOAuth.GetSomeStuff();
...

Programs & Examples On #Parallel builds

Symbol for any number of any characters in regex?

How do I copy a hash in Ruby?

Subset data.frame by date

Using both Python 2.x and Python 3.x in IPython Notebook

Python string prints as [u'String']

iOS8 Beta Ad-Hoc App Download (itms-services)

How to access parameters in a Parameterized Build?

Insert a string at a specific index

Failed to create provisioning profile

How get the base URL via context path in JSF?

JSTL 1.2 variation leveraged from BalusC answer

Maven project.build.directory

How to get access to job parameters from ItemReader, in Spring Batch?

Is there a command line command for verifying what version of .NET is installed

Entity Framework: There is already an open DataReader associated with this Command

How to add/subtract time (hours, minutes, etc.) from a Pandas DataFrame.Index whos objects are of type datetime.time?

Ruby on Rails: Clear a cached page

How to use Redirect in the new react-router-dom of Reactjs

Sort Java Collection

How to loop over a Class attributes in Java?

See also

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How to reload a page using Angularjs?

Convert ascii char[] to hexadecimal char[] in C

How do I delete rows in a data frame?

.mp4 file not playing in chrome

How can I debug git/git-shell related problems?

Including non-Python files with setup.py

Centering image and text in R Markdown for a PDF report

Checking to see if a DateTime variable has had a value assigned

How do I restrict an input to only accept numbers?

What does Ruby have that Python doesn't, and vice versa?

BAT file: Open new cmd window and execute a command in there

Escaping Commands with White Spaces

Examples:

How to retrieve unique count of a field using Kibana + Elastic Search

The program can’t start because MSVCR71.dll is missing from your computer. Try reinstalling the program to fix this program

Entity Framework: table without primary key

How to increase memory limit for PHP over 2GB?

sendUserActionEvent() is null

difference between variables inside and outside of init()