Programs & Examples On #Speech synthesis

Speech synthesis is the artificial production of human speech.

How can I put CSS and HTML code in the same file?

There's a style tag, so you could do something like this:

<style type="text/css">
  .title 
  {
    color: blue;
    text-decoration: bold;
    text-size: 1em;
  }
</style>

Cannot find runtime 'node' on PATH - Visual Studio Code and Node.js

I use /bin/zsh, and I changed vscode to do the same, but somehow vscode still use the path from /bin/bash. So I created a .bash_profile file with node location in the path.

Simply run in terminal:

echo "PATH=$PATH
export \$PATH" >> ~/.bash_profile

Restart vscode, and it will work.

groovy: safely find a key in a map and return its value

The reason you get a Null Pointer Exception is because there is no key likesZZZ in your second example. Try:

def mymap = [name:"Gromit", likes:"cheese", id:1234]
def x = mymap.find{ it.key == "likes" }.value
if(x)
    println "x value: ${x}"

Java: How to convert String[] to List or Set

The easiest way is through

Arrays.asList(stringArray);

ImportError: No module named 'google'

I solved the problem in this way:

  1. sudo pip install conda
  2. pip install google

and no more error.

Elasticsearch: Failed to connect to localhost port 9200 - Connection refused

After utilizing some of the answers above, don't forget that after an apt install, a total reboot might be in order.

How to determine whether a given Linux is 32 bit or 64 bit?

In Bash, using integer overflow:

if ((1 == 1<<32)); then
  echo 32bits
else
  echo 64bits
fi

It's much more efficient than invoking another process or opening files.

How to know which is running in Jupyter notebook?

Creating a virtual environment for Jupyter Notebooks

A minimal Python install is

sudo apt install python3.7 python3.7-venv python3.7-minimal python3.7-distutils python3.7-dev python3.7-gdbm python3-gdbm-dbg python3-pip

Then you can create and use the environment

/usr/bin/python3.7 -m venv test
cd test
source test/bin/activate
pip install jupyter matplotlib seaborn numpy pandas scipy
# install other packages you need with pip/apt
jupyter notebook
deactivate

You can make a kernel for Jupyter with

ipython3 kernel install --user --name=test

How do I convert an ANSI encoded file to UTF-8 with Notepad++?

Maybe this is not the answer you needed, but I encountered similar problem, so I decided to put it here.

I needed to convert 500 xml files to UTF8 via Notepad++. Why Notepad++? When I used the option "Encode in UTF8" (many other converters use the same logic) it messed up all special characters, so I had to use "Convert to UTF8" explicitly.


Here some simple steps to convert multiple files via Notepad++ without messing up with special characters (for ex. diacritical marks).

  1. Run Notepad++ and then open menu Plugins->Plugin Manager->Show Plugin Manager
  2. Install Python Script. When plugin is installed, restart the application.
  3. Choose menu Plugins->Python Script->New script.
  4. Choose its name, and then past the following code:

convertToUTF8.py

import os
import sys
from Npp import notepad # import it first!

filePathSrc="C:\\Users\\" # Path to the folder with files to convert
for root, dirs, files in os.walk(filePathSrc):
    for fn in files: 
        if fn[-4:] == '.xml': # Specify type of the files
            notepad.open(root + "\\" + fn)      
            notepad.runMenuCommand("Encoding", "Convert to UTF-8")
            # notepad.save()
            # if you try to save/replace the file, an annoying confirmation window would popup.
            notepad.saveAs("{}{}".format(fn[:-4], '_utf8.xml')) 
            notepad.close()

After all, run the script

How to read the output from git diff?

The default output format (which originally comes from a program known as diff if you want to look for more info) is known as a “unified diff”. It contains essentially 4 different types of lines:

  • context lines, which start with a single space,
  • insertion lines that show a line that has been inserted, which start with a +,
  • deletion lines, which start with a -, and
  • metadata lines which describe higher level things like which file this is talking about, what options were used to generate the diff, whether the file changed its permissions, etc.

I advise that you practice reading diffs between two versions of a file where you know exactly what you changed. Like that you'll recognize just what is going on when you see it.

Angular2 equivalent of $document.ready()

In your main.ts file bootstrap after DOMContentLoaded so angular will load when DOM is fully loaded.

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';
import { environment } from './environments/environment';

if (environment.production) {
  enableProdMode();
}



document.addEventListener('DOMContentLoaded', () => {
  platformBrowserDynamic().bootstrapModule(AppModule)
  .catch(err => console.log(err));
});

C# HttpClient 4.5 multipart/form-data upload

Here is another example on how to use HttpClient to upload a multipart/form-data.

It uploads a file to a REST API and includes the file itself (e.g. a JPG) and additional API parameters. The file is directly uploaded from local disk via FileStream.

See here for the full example including additional API specific logic.

public static async Task UploadFileAsync(string token, string path, string channels)
{
    // we need to send a request with multipart/form-data
    var multiForm = new MultipartFormDataContent();

    // add API method parameters
    multiForm.Add(new StringContent(token), "token");
    multiForm.Add(new StringContent(channels), "channels");

    // add file and directly upload it
    FileStream fs = File.OpenRead(path);
    multiForm.Add(new StreamContent(fs), "file", Path.GetFileName(path));

    // send request to API
    var url = "https://slack.com/api/files.upload";
    var response = await client.PostAsync(url, multiForm);
}

Java - Reading XML file

If using another library is an option, the following may be easier:

package for_so;

import java.io.File;

import rasmus_torkel.xml_basic.read.TagNode;
import rasmus_torkel.xml_basic.read.XmlReadOptions;
import rasmus_torkel.xml_basic.read.impl.XmlReader;

public class Q7704827_SimpleRead
{
    public static void
    main(String[] args)
    {
        String fileName = args[0];

        TagNode emailNode = XmlReader.xmlFileToRoot(new File(fileName), "EmailSettings", XmlReadOptions.DEFAULT);
        String recipient = emailNode.nextTextFieldE("recipient");
        String sender = emailNode.nextTextFieldE("sender");
        String subject = emailNode.nextTextFieldE("subject");
        String description = emailNode.nextTextFieldE("description");
        emailNode.verifyNoMoreChildren();

        System.out.println("recipient =  " + recipient);
        System.out.println("sender =     " + sender);
        System.out.println("subject =    " + subject);
        System.out.println("desciption = " + description);
    }
}

The library and its documentation are at rasmustorkel.com

Is the Javascript date object always one day off?

You can convert this date to UTC date by

new Date(Date.UTC(Year, Month, Day, Hour, Minute, Second))

And it is always recommended to use UTC (universal time zone) date instead of Date with local time, as by default dates are stored in Database with UTC. So, it is good practice to use and interpret dates in UTC format throughout entire project. For example,

Date.getUTCYear(), getUTCMonth(), getUTCDay(), getUTCHours()

So, using UTC dates solves all the problem related to timezone issues.

PHP reindex array?

Use array_values.

$myarray = array_values($myarray);

How do I get whole and fractional parts from double in JSP/Java?

[Edit: The question originally asked how to get the mantissa and exponent.]

Where n is the number to get the real mantissa/exponent:

exponent = int(log(n))
mantissa = n / 10^exponent

Or, to get the answer you were looking for:

exponent = int(n)
mantissa = n - exponent

These are not Java exactly but should be easy to convert.

How to VueJS router-link active style

Just add to @Bert's solution to make it more clear:

    const routes = [
  { path: '/foo', component: Foo },
  { path: '/bar', component: Bar }
]

const router = new VueRouter({
  routes,
  linkExactActiveClass: "active" // active class for *exact* links.
})

As one can see, this line should be removed:

linkActiveClass: "active", // active class for non-exact links.

this way, ONLY the current link is hi-lighted. This should apply to most of the cases.

David

How to add New Column with Value to the Existing DataTable?

//Data Table

 protected DataTable tblDynamic
        {
            get
            {
                return (DataTable)ViewState["tblDynamic"];
            }
            set
            {
                ViewState["tblDynamic"] = value;
            }
        }
//DynamicReport_GetUserType() function for getting data from DB


System.Data.DataSet ds = manage.DynamicReport_GetUserType();
                tblDynamic = ds.Tables[13];

//Add Column as "TypeName"

                tblDynamic.Columns.Add(new DataColumn("TypeName", typeof(string)));

//fill column data against ds.Tables[13]


                for (int i = 0; i < tblDynamic.Rows.Count; i++)
                {

                    if (tblDynamic.Rows[i]["Type"].ToString()=="A")
                    {
                        tblDynamic.Rows[i]["TypeName"] = "Apple";
                    }
                    if (tblDynamic.Rows[i]["Type"].ToString() == "B")
                    {
                        tblDynamic.Rows[i]["TypeName"] = "Ball";
                    }
                    if (tblDynamic.Rows[i]["Type"].ToString() == "C")
                    {
                        tblDynamic.Rows[i]["TypeName"] = "Cat";
                    }
                    if (tblDynamic.Rows[i]["Type"].ToString() == "D")
                    {
                        tblDynamic.Rows[i]["TypeName"] = "Dog;
                    }
                }

Arrays vs Vectors: Introductory Similarities and Differences

Those reference pretty much answered your question. Simply put, vectors' lengths are dynamic while arrays have a fixed size. when using an array, you specify its size upon declaration:

int myArray[100];
myArray[0]=1;
myArray[1]=2;
myArray[2]=3;

for vectors, you just declare it and add elements

vector<int> myVector;
myVector.push_back(1);
myVector.push_back(2);
myVector.push_back(3);
...

at times you wont know the number of elements needed so a vector would be ideal for such a situation.

socket.shutdown vs socket.close

Explanation of shutdown and close: Graceful shutdown (msdn)

Shutdown (in your case) indicates to the other end of the connection there is no further intention to read from or write to the socket. Then close frees up any memory associated with the socket.

Omitting shutdown may cause the socket to linger in the OSs stack until the connection has been closed gracefully.

IMO the names 'shutdown' and 'close' are misleading, 'close' and 'destroy' would emphasise their differences.

How to fix ReferenceError: primordials is not defined in node

This error is because of the new version of Node (12) and an old version of gulp (less than 4).

Downgrading Node and other dependencies isn't recommended. I solved this by updating package.json file fetching latest version of all dependencies. For this, I use npm-check-updates. It is a module that updates the package.json with the latest version of all dependencies.

Reference: https://www.npmjs.com/package/npm-check-updates

npm i -g npm-check-updates
ncu -u
npm install

In most cases, we will have to update the gulpfile.js as well like the following:

Reference: https://fettblog.eu/gulp-4-parallel-and-series/#migration

Before:

gulp.task(
    'sass', function () {
        return gulp.src([sourcePath + '/sass/**/*.scss', "!" + sourcePath + "/sass/**/_*.scss"])

            ....

    }
);

Other config...

gulp.task(
    'watch', function () {
        gulp.watch(sourcePath + '/sass/**/*.scss', ['sass']);
    }
);

After:

gulp.task('sass', gulp.series(function(done) {
    return gulp.src([sourcePath + '/sass/**/*.scss', "!" + sourcePath + "/sass/**/_*.scss"])

            ...

    done();
}));

Other config...

gulp.task(
    'watch', function () {
        gulp.watch(sourcePath + '/sass/**/*.scss', gulp.series('sass'));
    }
);

Is Secure.ANDROID_ID unique for each device?

So if you want something unique to the device itself, TM.getDeviceId() should be sufficient.

Here is the code which shows how to get Telephony manager ID. The android Device ID that you are using can change on factory settings and also some manufacturers have issue in giving unique id.

TelephonyManager tm = 
        (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
String androidId = Secure.getString(this.getContentResolver(), Secure.ANDROID_ID);
Log.d("ID", "Android ID: " + androidId);
Log.d("ID", "Device ID : " + tm.getDeviceId());

Be sure to take permissions for TelephonyManager by using

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

Resize on div element

For a google maps integration I was looking for a way to detect when a div has changed in size. Since google maps always require proper dimensions e.g. width and height in order to render properly.

The solution I came up with is a delegation of an event, in my case a tab click. This could be a window resize of course, the idea remains the same:

if (parent.is(':visible')) {
    w = parent.outerWidth(false);
    h = w * mapRatio /*9/16*/;
    this.map.css({ width: w, height: h });
} else {
    this.map.closest('.tab').one('click', function() {
        this.activate();
    }.bind(this));
}

this.map in this case is my map div. Since my parent is invisible on load, the computed width and height are 0 or don't match. By using .bind(this) I can delegate the script execution (this.activate) to an event (click).

Now I'm confident the same applies for resize events.

$(window).one('resize', function() {
    this.div.css({ /*whatever*/ });
}.bind(this));

Hope it helps anyone!

Remove Backslashes from Json Data in JavaScript

tl;dr: You don't have to remove the slashes, you have nested JSON, and hence have to decode the JSON twice: DEMO (note I used double slashes in the example, because the JSON is inside a JS string literal).


I assume that your actual JSON looks like

{"data":"{\n \"taskNames\" : [\n \"01 Jan\",\n \"02 Jan\",\n \"03 Jan\",\n \"04 Jan\",\n \"05 Jan\",\n \"06 Jan\",\n \"07 Jan\",\n \"08 Jan\",\n \"09 Jan\",\n \"10 Jan\",\n \"11 Jan\",\n \"12 Jan\",\n \"13 Jan\",\n \"14 Jan\",\n \"15 Jan\",\n \"16 Jan\",\n \"17 Jan\",\n \"18 Jan\",\n \"19 Jan\",\n \"20 Jan\",\n \"21 Jan\",\n \"22 Jan\",\n \"23 Jan\",\n \"24 Jan\",\n \"25 Jan\",\n \"26 Jan\",\n \"27 Jan\"]}"}

I.e. you have a top level object with one key, data. The value of that key is a string containing JSON itself. This is usually because the server side code didn't properly create the JSON. That's why you see the \" inside the string. This lets the parser know that " is to be treated literally and doesn't terminate the string.

So you can either fix the server side code, so that you don't double encode the data, or you have to decode the JSON twice, e.g.

var data = JSON.parse(JSON.parse(json).data));

what is the most efficient way of counting occurrences in pandas?

When you want to count the frequency of categorical data in a column in pandas dataFrame use: df['Column_Name'].value_counts()

-Source.

Struct inheritance in C++

Of course. In C++, structs and classes are nearly identical (things like defaulting to public instead of private are among the small differences).

How do I compute derivative using Numpy?

You can use scipy, which is pretty straight forward:

scipy.misc.derivative(func, x0, dx=1.0, n=1, args=(), order=3)

Find the nth derivative of a function at a point.

In your case:

from scipy.misc import derivative

def f(x):
    return x**2 + 1

derivative(f, 5, dx=1e-6)
# 10.00000000139778

Absolute positioning ignoring padding of parent

First, let's see why this is happening.

The reason is that, surprisingly, when a box has position: absolute its containing box is the parent's padding box (that is, the box around its padding). This is surprising because usually (that is, when using static or relative positioning) the containing box is the parent's content box.

Here is the relevant part of the CSS specification:

In the case that the ancestor is an inline element, the containing block is the bounding box around the padding boxes of the first and the last inline boxes generated for that element.... Otherwise, the containing block is formed by the padding edge of the ancestor.

The simplest approach—as suggested in Winter's answer—is to use padding: inherit on the absolutely positioned div. It only works, though, if you don't want the absolutely positioned div to have any additional padding of its own. I think the most general-purpose solutions (in that both elements can have their own independent padding) are:

  1. Add an extra relatively positioned div (with no padding) around the absolutely positioned div. That new div will respect the padding of its parent, and the absolutely positioned div will then fill it.

    The downside, of course, is that you're messing with the HTML simply for presentational purposes.

  2. Repeat the padding (or add to it) on the absolutely positioned element.

    The downside here is that you have to repeat the values in your CSS, which is brittle if you're writing the CSS directly. However, if you're using a pre-processing tool like SASS or LESS you can avoid that problem by using a variable. This is the method I personally use.

Get the value of checked checkbox?

<input class="messageCheckbox" type="checkbox" onchange="getValue(this.value)" value="3" name="mailId[]">

<input class="messageCheckbox" type="checkbox" onchange="getValue(this.value)" value="1" name="mailId[]">
function getValue(value){
    alert(value);
}

Getting values from JSON using Python

There's a Py library that has a module that facilitates access to Json-like dictionary key-values as attributes: https://github.com/asuiu/pyxtension You can use it as:

j = Json('{"lat":444, "lon":555}')
j.lat + ' ' + j.lon

Jquery checking success of ajax post

using jQuery 1.8 and above, should use the following:

var request = $.ajax({
    type: 'POST',
    url: 'mmm.php',
    data: { abc: "abcdefghijklmnopqrstuvwxyz" } })
    .done(function(data) { alert("success"+data.slice(0, 100)); })
    .fail(function() { alert("error"); })
    .always(function() { alert("complete"); });

check out the docs as @hitautodestruct stated.

identifier "string" undefined?

#include <string> would be the correct c++ include, also you need to specify the namespace with std::string or more generally with using namespace std;

How to delete/remove nodes on Firebase

I hope this code will help someone - it is from official Google Firebase documentation:

var adaRef = firebase.database().ref('users/ada');
adaRef.remove()
  .then(function() {
    console.log("Remove succeeded.")
  })
  .catch(function(error) {
    console.log("Remove failed: " + error.message)
  });

How do I get time of a Python program's execution?

If you want to measure time in microseconds, then you can use the following version, based completely on the answers of Paul McGuire and Nicojo - it's Python 3 code. I've also added some colour to it:

import atexit
from time import time
from datetime import timedelta, datetime


def seconds_to_str(elapsed=None):
    if elapsed is None:
        return datetime.now().strftime("%Y-%m-%d %H:%M:%S.%f")
    else:
        return str(timedelta(seconds=elapsed))


def log(txt, elapsed=None):
    colour_cyan = '\033[36m'
    colour_reset = '\033[0;0;39m'
    colour_red = '\033[31m'
    print('\n ' + colour_cyan + '  [TIMING]> [' + seconds_to_str() + '] ----> ' + txt + '\n' + colour_reset)
    if elapsed:
        print("\n " + colour_red + " [TIMING]> Elapsed time ==> " + elapsed + "\n" + colour_reset)


def end_log():
    end = time()
    elapsed = end-start
    log("End Program", seconds_to_str(elapsed))


start = time()
atexit.register(end_log)
log("Start Program")

log() => function that prints out the timing information.

txt ==> first argument to log, and its string to mark timing.

atexit ==> Python module to register functions that you can call when the program exits.

How do I read the first line of a file using cat?

You don't, use head instead.

head -n 1 file.txt

How to remove duplicate white spaces in string using Java?

Try this - You have to import java.util.regex.*;

    Pattern pattern = Pattern.compile("\\s+");
    Matcher matcher = pattern.matcher(string);
    boolean check = matcher.find();
    String str = matcher.replaceAll(" ");

Where string is your string on which you need to remove duplicate white spaces

HTML input arrays

As far as I know, there isn't anything on the HTML specs because browsers aren't supposed to do anything different for these fields. They just send them as they normally do and PHP is the one that does the parsing into an array, as do other languages.

Add my custom http header to Spring RestTemplate request / extend RestTemplate

If the goal is to have a reusable RestTemplate which is in general useful for attaching the same header to a series of similar request a org.springframework.boot.web.client.RestTemplateCustomizer parameter can be used with a RestTemplateBuilder:

 String accessToken= "<the oauth 2 token>";
 RestTemplate restTemplate = new RestTemplateBuilder(rt-> rt.getInterceptors().add((request, body, execution) -> {
        request.getHeaders().add("Authorization", "Bearer "+accessToken);
        return execution.execute(request, body);
    })).build();

CSS - Expand float child DIV height to parent's height

I learned of this neat trick in an internship interview. The original question is how do you ensure the height of each top component in three columns have the same height that shows all the content available. Basically create a child component that is invisible that renders the maximum possible height.

<div class="parent">
    <div class="assert-height invisible">
        <!-- content -->
    </div>
    <div class="shown">
        <!-- content -->
    </div>
</div>

When is JavaScript synchronous?

JavaScript is single threaded and has a synchronous execution model. Single threaded means that one command is being executed at a time. Synchronous means one at a time i.e. one line of code is being executed at time in order the code appears. So in JavaScript one thing is happening at a time.

Execution Context

The JavaScript engine interacts with other engines in the browser. In the JavaScript execution stack there is global context at the bottom and then when we invoke functions the JavaScript engine creates new execution contexts for respective functions. When the called function exits its execution context is popped from the stack, and then next execution context is popped and so on...

For example

function abc()
{
   console.log('abc');
}


function xyz()
{
   abc()
   console.log('xyz');
}
var one = 1;
xyz();

In the above code a global execution context will be created and in this context var one will be stored and its value will be 1... when the xyz() invocation is called then a new execution context will be created and if we had defined any variable in xyz function those variables would be stored in the execution context of xyz(). In the xyz function we invoke abc() and then the abc() execution context is created and put on the execution stack... Now when abc() finishes its context is popped from stack, then the xyz() context is popped from stack and then global context will be popped...

Now about asynchronous callbacks; asynchronous means more than one at a time.

Just like the execution stack there is the Event Queue. When we want to be notified about some event in the JavaScript engine we can listen to that event, and that event is placed on the queue. For example an Ajax request event, or HTTP request event.

Whenever the execution stack is empty, like shown in above code example, the JavaScript engine periodically looks at the event queue and sees if there is any event to be notified about. For example in the queue there were two events, an ajax request and a HTTP request. It also looks to see if there is a function which needs to be run on that event trigger... So the JavaScript engine is notified about the event and knows the respective function to execute on that event... So the JavaScript engine invokes the handler function, in the example case, e.g. AjaxHandler() will be invoked and like always when a function is invoked its execution context is placed on the execution context and now the function execution finishes and the event ajax request is also removed from the event queue... When AjaxHandler() finishes the execution stack is empty so the engine again looks at the event queue and runs the event handler function of HTTP request which was next in queue. It is important to remember that the event queue is processed only when execution stack is empty.

For example see the code below explaining the execution stack and event queue handling by Javascript engine.

function waitfunction() {
    var a = 5000 + new Date().getTime();
    while (new Date() < a){}
    console.log('waitfunction() context will be popped after this line');
}

function clickHandler() {
    console.log('click event handler...');   
}

document.addEventListener('click', clickHandler);


waitfunction(); //a new context for this function is created and placed on the execution stack
console.log('global context will be popped after this line');

And

<html>
    <head>

    </head>
    <body>

        <script src="program.js"></script>
    </body>
</html>

Now run the webpage and click on the page, and see the output on console. The output will be

waitfunction() context will be popped after this line
global context will be emptied after this line
click event handler...

The JavaScript engine is running the code synchronously as explained in the execution context portion, the browser is asynchronously putting things in event queue. So the functions which take a very long time to complete can interrupt event handling. Things happening in a browser like events are handled this way by JavaScript, if there is a listener supposed to run, the engine will run it when the execution stack is empty. And events are processed in the order they happen, so the asynchronous part is about what is happening outside the engine i.e. what should the engine do when those outside events happen.

So JavaScript is always synchronous.

Accessing MVC's model property from Javascript

Contents of the Answer

1) How to access Model data in Javascript/Jquery code block in .cshtml file

2) How to access Model data in Javascript/Jquery code block in .js file

How to access Model data in Javascript/Jquery code block in .cshtml file

There are two types of c# variable (Model) assignments to JavaScript variable.

  1. Property assignment - Basic datatypes like int, string, DateTime (ex: Model.Name)
  2. Object assignment - Custom or inbuilt classes (ex: Model, Model.UserSettingsObj)

Lets look into the details of these two assignments.

For the rest of the answer lets consider the below AppUser Model as an example.

public class AppUser
{
    public string Name { get; set; }
    public bool IsAuthenticated { get; set; }
    public DateTime LoginDateTime { get; set; }
    public int Age { get; set; }
    public string UserIconHTML { get; set; }
}

And the values we assign this Model are

AppUser appUser = new AppUser
{
    Name = "Raj",
    IsAuthenticated = true,
    LoginDateTime = DateTime.Now,
    Age = 26,
    UserIconHTML = "<i class='fa fa-users'></i>"
};

Property assignment

Lets use different syntax for assignment and observe the results.

1) Without wrapping property assignment in quotes.

var Name = @Model.Name;  
var Age = @Model.Age;
var LoginTime = @Model.LoginDateTime; 
var IsAuthenticated = @Model.IsAuthenticated;   
var IconHtml = @Model.UserIconHTML;  

enter image description here

As you can see there are couple of errors, Raj and True is considered to be javascript variables and since they dont exist its an variable undefined error. Where as for the dateTime varialble the error is unexpected number numbers cannot have special characters, The HTML tags are converted into its entity names so that the browser doesn't mix up your values and the HTML markup.

2) Wrapping property assignment in Quotes.

var Name = '@Model.Name';
var Age = '@Model.Age';
var LoginTime = '@Model.LoginDateTime';
var IsAuthenticated = '@Model.IsAuthenticated';
var IconHtml = '@Model.UserIconHTML'; 

enter image description here

The results are valid, So wrapping the property assignment in quotes gives us valid syntax. But note that the Number Age is now a string, So if you dont want that we can just remove the quotes and it will be rendered as a number type.

3) Using @Html.Raw but without wrapping it in quotes

 var Name = @Html.Raw(Model.Name);
 var Age = @Html.Raw(Model.Age);
 var LoginTime = @Html.Raw(Model.LoginDateTime);
 var IsAuthenticated = @Html.Raw(Model.IsAuthenticated);
 var IconHtml = @Html.Raw(Model.UserIconHTML);

enter image description here

The results are similar to our test case 1. However using @Html.Raw()on the HTML string did show us some change. The HTML is retained without changing to its entity names.

From the docs Html.Raw()

Wraps HTML markup in an HtmlString instance so that it is interpreted as HTML markup.

But still we have errors in other lines.

4) Using @Html.Raw and also wrapping it within quotes

var Name ='@Html.Raw(Model.Name)';
var Age = '@Html.Raw(Model.Age)';
var LoginTime = '@Html.Raw(Model.LoginDateTime)';
var IsAuthenticated = '@Html.Raw(Model.IsAuthenticated)';
var IconHtml = '@Html.Raw(Model.UserIconHTML)';

enter image description here

The results are good with all types. But our HTML data is now broken and this will break the scripts. The issue is because we are using single quotes ' to wrap the the data and even the data has single quotes.

We can overcome this issue with 2 approaches.

1) use double quotes " " to wrap the HTML part. As the inner data has only single quotes. (Be sure that after wrapping with double quotes there are no " within the data too)

  var IconHtml = "@Html.Raw(Model.UserIconHTML)";

2) Escape the character meaning in your server side code. Like

  UserIconHTML = "<i class=\"fa fa-users\"></i>"

Conclusion of property assignment

  • Use quotes for non numeric dataType.
  • Do Not use quotes for numeric dataType.
  • Use Html.Raw to interpret your HTML data as is.
  • Take care of your HTML data to either escape the quotes meaning in server side, Or use a different quote than in data during assignment to javascript variable.

Object assignment

Lets use different syntax for assignment and observe the results.

1) Without wrapping object assignment in quotes.

  var userObj = @Model; 

enter image description here

When you assign a c# object to javascript variable the value of the .ToString() of that oject will be assigned. Hence the above result.

2 Wrapping object assignment in quotes

var userObj = '@Model'; 

enter image description here

3) Using Html.Raw without quotes.

   var userObj = @Html.Raw(Model); 

enter image description here

4) Using Html.Raw along with quotes

   var userObj = '@Html.Raw(Model)'; 

enter image description here

The Html.Raw was of no much use for us while assigning a object to variable.

5) Using Json.Encode() without quotes

var userObj = @Json.Encode(Model); 

//result is like
var userObj = {&quot;Name&quot;:&quot;Raj&quot;,
               &quot;IsAuthenticated&quot;:true,
               &quot;LoginDateTime&quot;:&quot;\/Date(1482572875150)\/&quot;,
               &quot;Age&quot;:26,
               &quot;UserIconHTML&quot;:&quot;\u003ci class=\&quot;fa fa-users\&quot;\u003e\u003c/i\u003e&quot;
              };

We do see some change, We see our Model is being interpreted as a object. But we have those special characters changed into entity names. Also wrapping the above syntax in quotes is of no much use. We simply get the same result within quotes.

From the docs of Json.Encode()

Converts a data object to a string that is in the JavaScript Object Notation (JSON) format.

As you have already encountered this entity Name issue with property assignment and if you remember we overcame it with the use of Html.Raw. So lets try that out. Lets combine Html.Raw and Json.Encode

6) Using Html.Raw and Json.Encode without quotes.

var userObj = @Html.Raw(Json.Encode(Model));

Result is a valid Javascript Object

 var userObj = {"Name":"Raj",
     "IsAuthenticated":true,
     "LoginDateTime":"\/Date(1482573224421)\/",
     "Age":26,
     "UserIconHTML":"\u003ci class=\"fa fa-users\"\u003e\u003c/i\u003e"
 };

enter image description here

7) Using Html.Raw and Json.Encode within quotes.

var userObj = '@Html.Raw(Json.Encode(Model))';

enter image description here

As you see wrapping with quotes gives us a JSON data

Conslusion on Object assignment

  • Use Html.Raw and Json.Encode in combintaion to assign your object to javascript variable as JavaScript object.
  • Use Html.Raw and Json.Encode also wrap it within quotes to get a JSON

Note: If you have observed the DataTime data format is not right. This is because as said earlier Converts a data object to a string that is in the JavaScript Object Notation (JSON) format and JSON does not contain a date type. Other options to fix this is to add another line of code to handle this type alone using javascipt Date() object

var userObj.LoginDateTime = new Date('@Html.Raw(Model.LoginDateTime)'); 
//without Json.Encode


How to access Model data in Javascript/Jquery code block in .js file

Razor syntax has no meaning in .js file and hence we cannot directly use our Model insisde a .js file. However there is a workaround.

1) Solution is using javascript Global variables.

We have to assign the value to a global scoped javascipt variable and then use this variable within all code block of your .cshtml and .js files. So the syntax would be

<script type="text/javascript">
  var userObj = @Html.Raw(Json.Encode(Model)); //For javascript object
  var userJsonObj = '@Html.Raw(Json.Encode(Model))'; //For json data
</script>

With this in place we can use the variables userObj and userJsonObj as and when needed.

Note: I personally dont suggest using global variables as it gets very hard for maintainance. However if you have no other option then you can use it with having a proper naming convention .. something like userAppDetails_global.

2) Using function() or closure Wrap all the code that is dependent on the model data in a function. And then execute this function from the .cshtml file .

external.js

 function userDataDependent(userObj){
  //.... related code
 }

.cshtml file

 <script type="text/javascript">
  userDataDependent(@Html.Raw(Json.Encode(Model))); //execute the function     
</script>

Note: Your external file must be referenced prior to the above script. Else the userDataDependent function is undefined.

Also note that the function must be in global scope too. So either solution we have to deal with global scoped players.

JFrame: How to disable window resizing?

Use setResizable on your JFrame

yourFrame.setResizable(false);

But extending JFrame is generally a bad idea.

Getting the names of all files in a directory with PHP

I have smaller code todo this:

$path = "Pending2Post/";
$files = scandir($path);
foreach ($files as &$value) {
    echo "<a href='http://localhost/".$value."' target='_blank' >".$value."</a><br/><br/>";
}

Use stored procedure to insert some data into a table

if you want to populate a table in SQL SERVER you can use while statement as follows:

declare @llenandoTabla INT = 0;
while @llenandoTabla < 10000
begin
insert into employeestable // Name of my table
(ID, FIRSTNAME, LASTNAME, GENDER, SALARY) // Parameters of my table
VALUES 
(555, 'isaias', 'perez', 'male', '12220') //values
set @llenandoTabla = @llenandoTabla + 1;
end

Hope it helps.

Appending to an existing string

You can use << to append to a string in-place.

s = "foo"
old_id = s.object_id
s << "bar"
s                      #=> "foobar"
s.object_id == old_id  #=> true

time data does not match format

You have the month and day swapped:

'%m/%d/%Y %H:%M:%S.%f'

28 will never fit in the range for the %m month parameter otherwise.

With %m and %d in the correct order parsing works:

>>> from datetime import datetime
>>> datetime.strptime('07/28/2014 18:54:55.099000', '%m/%d/%Y %H:%M:%S.%f')
datetime.datetime(2014, 7, 28, 18, 54, 55, 99000)

You don't need to add '000'; %f can parse shorter numbers correctly:

>>> datetime.strptime('07/28/2014 18:54:55.099', '%m/%d/%Y %H:%M:%S.%f')
datetime.datetime(2014, 7, 28, 18, 54, 55, 99000)

jQuery: go to URL with target="_blank"

The .ready function is used to insert the attribute once the page has finished loading.

$(document).ready(function() {
     $("class name or id a.your class name").attr({"target" : "_blank"})
})

Eclipse CDT: Symbol 'cout' could not be resolved

You guys are looking under the wrong section. I realized the difference when I installed in Linux after recently getting frustrated with Windows and the difference was immediately apparent.

In the new setup I have an includes folder in a projected that I created out of existing source. I can expand this and see a ton of includes; however, I cannot add to them. This lead me to a hunt for where these files were being listed.

They're listed under the Project Properties > C/C++ General > Preprocessor Includes > GNU C++ CDT GCC Built-in Compiler Settings [Shared] Under that is a ton of includes.

These settings are set by the toolchain you've selected.

"CAUTION: provisional headers are shown" in Chrome debugger

"Caution: provisional headers are shown" message can be shown when website hosted on HTTPS invokes a calls to WebApi hosted on HTTP. You can check all if all your Api's are HTTPS. Browser prevents to do a call to insecure resource. You can see similar message in your code when use FETCH API to domain with HTTP.

Mixed Content: The page at 'https://website.com' was loaded over HTTPS, but requested an insecure resource 'http://webapi.com'. This request has been blocked; the content must be served over HTTPS.

SMTP Connect() failed. Message was not sent.Mailer error: SMTP Connect() failed

I know its been a while since this question but I had the exact problem and solved it by disabling SMTP_BLOCK on csf.conf (we use CSF for a firewall).

To disable just edit csf.conf and disable SMTP_BLOCK like so:

###############################################################################
# SECTION:SMTP Settings
###############################################################################
# Block outgoing SMTP except for root, exim and mailman (forces scripts/users
# to use the exim/sendmail binary instead of sockets access). This replaces the
# protection as WHM > Tweak Settings > SMTP Tweaks
#
# This option uses the iptables ipt_owner/xt_owner module and must be loaded
# for it to work. It may not be available on some VPS platforms
#
# Note: Run /etc/csf/csftest.pl to check whether this option will function on
# this server
# SMTP_BLOCK = "1" --> this will cause phpmailer Connection timed out (110)
SMTP_BLOCK = "0"

CSS Transition doesn't work with top, bottom, left, right

Something that is not relevant for the OP, but maybe for someone else in the future:

For pixels (px), if the value is "0", the unit can be omitted: right: 0 and right: 0px both work.

However I noticed that in Firefox and Chrome this is not the case for the seconds unit (s). While transition: right 1s ease 0s works, transition: right 1s ease 0 (missing unit s for last value transition-delay) does not (it does work in Edge however).

In the following example, you'll see that right works for both 0px and 0, but transition only works for 0s and it doesn't work with 0.

_x000D_
_x000D_
#box {_x000D_
    border: 1px solid black;_x000D_
    height: 240px;_x000D_
    width: 260px;_x000D_
    margin: 50px;_x000D_
    position: relative;_x000D_
}_x000D_
.jump {_x000D_
    position: absolute;_x000D_
    width: 200px;_x000D_
    height: 50px;_x000D_
    color: white;_x000D_
    padding: 5px;_x000D_
}_x000D_
#jump1 {_x000D_
    background-color: maroon;_x000D_
    top: 0px;_x000D_
    right: 0px;_x000D_
    transition: right 1s ease 0s;_x000D_
}_x000D_
#jump2 {_x000D_
    background-color: green;_x000D_
    top: 60px;_x000D_
    right: 0;_x000D_
    transition: right 1s ease 0s;_x000D_
}_x000D_
#jump3 {_x000D_
    background-color: blue;_x000D_
    top: 120px;_x000D_
    right: 0px;_x000D_
    transition: right 1s ease 0;_x000D_
}_x000D_
#jump4 {_x000D_
    background-color: gray;_x000D_
    top: 180px;_x000D_
    right: 0;_x000D_
    transition: right 1s ease 0;_x000D_
}_x000D_
#box:hover .jump {_x000D_
    right: 50px;_x000D_
}
_x000D_
<div id="box">_x000D_
  <div class="jump" id="jump1">right: 0px<br>transition: right 1s ease 0s</div>_x000D_
  <div class="jump" id="jump2">right: 0<br>transition: right 1s ease 0s</div>_x000D_
  <div class="jump" id="jump3">right: 0px<br>transition: right 1s ease 0</div>_x000D_
  <div class="jump" id="jump4">right: 0<br>transition: right 1s ease 0</div>_x000D_
</div>
_x000D_
_x000D_
_x000D_

Get value of input field inside an iframe

document.getElementById("idframe").contentWindow.document.getElementById("idelement").value;

Printing with "\t" (tabs) does not result in aligned columns

As mentioned by other folks, the variable length of the string is the issue.

Rather than reinventing the wheel, Apache Commons has a nice, clean solution for this in StringUtils.

StringUtils.rightPad("String to extend",100); //100 is the length you want to pad out to.

New features in java 7

In addition to what John Skeet said, here's an overview of the Java 7 project. It includes a list and description of the features.

Note: JDK 7 was released on July 28, 2011, so you should now go to the official java SE site.

Differences between git pull origin master & git pull origin/master

git pull origin master will fetch all the changes from the remote's master branch and will merge it into your local.We generally don't use git pull origin/master.We can do the same thing by git merge origin/master.It will merge all the changes from "cached copy" of origin's master branch into your local branch.In my case git pull origin/master is throwing the error.

no matching function for call to ' '

You are trying to pass pointers (which you do not delete, thus leaking memory) where references are needed. You do not really need pointers here:

Complex firstComplexNumber(81, 93);
Complex secondComplexNumber(31, 19);

cout << "Numarul complex este: " << firstComplexNumber << endl;
//                                  ^^^^^^^^^^^^^^^^^^ No need to dereference now

// ...

Complex::distanta(firstComplexNumber, secondComplexNumber);

How to create a checkbox with a clickable label?

Use this

<input type="checkbox" name="checkbox" id="checkbox_id" value="value">
<label for="checkbox_id" id="checkbox_lbl">Text</label>


$("#checkbox_lbl").click(function(){ 
    if($("#checkbox_id").is(':checked'))
        $("#checkbox_id").removAttr('checked');
    else
       $("#checkbox_id").attr('checked');
    });
});

What is IPV6 for localhost and 0.0.0.0?

IPv6 localhost

::1 is the loopback address in IPv6.

Within URLs

Within a URL, use square brackets []:

  • http://[::1]/
    Defaults to port 80.
  • http://[::1]:80/
    Specify port.

Enclosing the IPv6 literal in square brackets for use in a URL is defined in RFC 2732 – Format for Literal IPv6 Addresses in URL's.

What is InputStream & Output Stream? Why and when do we use them?

OutputStream is an abstract class that represents writing output. There are many different OutputStream classes, and they write out to certain things (like the screen, or Files, or byte arrays, or network connections, or etc). InputStream classes access the same things, but they read data in from them.

Here is a good basic example of using FileOutputStream and FileInputStream to write data to a file, then read it back in.

Best way to store passwords in MYSQL database

Passwords in the database should be stored encrypted. One way encryption (hashing) is recommended, such as SHA2, SHA2, WHIRLPOOL, bcrypt DELETED: MD5 or SHA1. (those are older, vulnerable

In addition to that you can use additional per-user generated random string - 'salt':

$salt = MD5($this->createSalt());

$Password = SHA2($postData['Password'] . $salt);

createSalt() in this case is a function that generates a string from random characters.

EDIT: or if you want more security, you can even add 2 salts: $salt1 . $pass . $salt2

Another security measure you can take is user inactivation: after 5 (or any other number) incorrect login attempts user is blocked for x minutes (15 mins lets say). It should minimize success of brute force attacks.

Get first and last day of month using threeten, LocalDate

The API was designed to support a solution that matches closely to business requirements

import static java.time.temporal.TemporalAdjusters.*;

LocalDate initial = LocalDate.of(2014, 2, 13);
LocalDate start = initial.with(firstDayOfMonth());
LocalDate end = initial.with(lastDayOfMonth());

However, Jon's solutions are also fine.

Difference between fprintf, printf and sprintf?

printf

  1. printf is used to perform output on the screen.
  2. syntax = printf("control string ", argument );
  3. It is not associated with File input/output

fprintf

  1. The fprintf it used to perform write operation in the file pointed to by FILE handle.
  2. The syntax is fprintf (filename, "control string ", argument );
  3. It is associated with file input/output

Add a new element to an array without specifying the index in Bash

As Dumb Guy points out, it's important to note whether the array starts at zero and is sequential. Since you can make assignments to and unset non-contiguous indices ${#array[@]} is not always the next item at the end of the array.

$ array=(a b c d e f g h)
$ array[42]="i"
$ unset array[2]
$ unset array[3]
$ declare -p array     # dump the array so we can see what it contains
declare -a array='([0]="a" [1]="b" [4]="e" [5]="f" [6]="g" [7]="h" [42]="i")'
$ echo ${#array[@]}
7
$ echo ${array[${#array[@]}]}
h

Here's how to get the last index:

$ end=(${!array[@]})   # put all the indices in an array
$ end=${end[@]: -1}    # get the last one
$ echo $end
42

That illustrates how to get the last element of an array. You'll often see this:

$ echo ${array[${#array[@]} - 1]}
g

As you can see, because we're dealing with a sparse array, this isn't the last element. This works on both sparse and contiguous arrays, though:

$ echo ${array[@]: -1}
i

Visual Studio displaying errors even if projects build

I solved this problem by deleting the temporary files of Microsoft .NET framework. Location: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files and C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files

Cannot assign requested address using ServerSocket.socketBind

if your are using server, there's "public network IP" and "internal network IP". Use the "internal network IP" in your file /etc/hosts and "public network IP" in your code. if you use "public network IP" in your file /etc/hosts then you will get this error.

How to launch html using Chrome at "--allow-file-access-from-files" mode?

That flag is dangerous!! Leaves your file system open for access. Documents originating from anywhere, local or web, should not, by default, have any access to local file:/// resources.

Much better solution is to run a little http server locally.

--- For Windows ---

The easiest is to install http-server globally using node's package manager:

npm install -g http-server

Then simply run http-server in any of your project directories:

Eg. d:\my_project> http-server

Starting up http-server, serving ./
Available on:
 http:169.254.116.232:8080
 http:192.168.88.1:8080
 http:192.168.0.7:8080
 http:127.0.0.1:8080
Hit CTRL-C to stop the server

Or as prusswan suggested, you can also install Python under windows, and follow the instructions below.

--- For Linux ---

Since Python is usually available in most linux distributions, just run python -m SimpleHTTPServer in your project directory, and you can load your page on http://localhost:8000

In Python 3 the SimpleHTTPServer module has been merged into http.server, so the new command is python3 -m http.server.

Easy, and no security risk of accidentally leaving your browser open vulnerable.

How do I download a tarball from GitHub using cURL?

Use the -L option to follow redirects:

curl -L https://github.com/pinard/Pymacs/tarball/v0.24-beta2 | tar zx

'namespace' but is used like a 'type'

I had this problem as I created a class "Response.cs" inside a folder named "Response". So VS was catching the new Response () as Folder/namespace.

So I changed the class name to StatusResponse.cs and called new StatusResponse().This solved the issue.

How to get child process from parent process

I am not sure if I understand you correctly, does this help?

ps --ppid <pid of the parent>

Function pointer as a member of a C struct

Maybe I am missing something here, but did you allocate any memory for that PString before you accessed it?

PString * initializeString() {
    PString *str;
    str = (PString *) malloc(sizeof(PString));
    str->length = &length;
    return str;
}

I'm trying to use python in powershell

The Directory is not set correctly so Please follow these steps.

  1. "MyComputer">Right Click>Properties>"System Properties">"Advanced" tab
  2. "Environment Variables">"Path">"Edit"
  3. In the "Variable value" box, Make sure you see following:

    ;c:\python27\;c:\python27\scripts

  4. Click "OK", Test this change by restarting your windows powershell. Type

    python

  5. Now python version 2 runs! yay!

How do you set the Content-Type header for an HttpClient request?

For those who troubled with charset

I had very special case that the service provider didn't accept charset, and they refuse to change the substructure to allow it... Unfortunately HttpClient was setting the header automatically through StringContent, and no matter if you pass null or Encoding.UTF8, it will always set the charset...

Today i was on the edge to change the sub-system; moving from HttpClient to anything else, that something came to my mind..., why not use reflection to empty out the "charset"? ... And before i even try it, i thought of a way, "maybe I can change it after initialization", and that worked.

Here's how you can set the exact "application/json" header without "; charset=utf-8".

var jsonRequest = JsonSerializeObject(req, options); // Custom function that parse object to string
var stringContent = new StringContent(jsonRequest, Encoding.UTF8, "application/json");
stringContent.Headers.ContentType.CharSet = null;
return stringContent;

Note: The null value in following won't work, and append "; charset=utf-8"

return new StringContent(jsonRequest, null, "application/json");

EDIT

@DesertFoxAZ suggests that also the following code can be used and works fine. (didn't test it myself, if it work's rate and credit him in comments)

stringContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");

Why compile Python code?

Yep, performance is the main reason and, as far as I know, the only reason.

If some of your files aren't getting compiled, maybe Python isn't able to write to the .pyc file, perhaps because of the directory permissions or something. Or perhaps the uncompiled files just aren't ever getting loaded... (scripts/modules only get compiled when they first get loaded)

How to split csv whose columns may contain ,

Use the Microsoft.VisualBasic.FileIO.TextFieldParser class. This will handle parsing a delimited file, TextReader or Stream where some fields are enclosed in quotes and some are not.

For example:

using Microsoft.VisualBasic.FileIO;

string csv = "2,1016,7/31/2008 14:22,Geoff Dalgas,6/5/2011 22:21,http://stackoverflow.com,\"Corvallis, OR\",7679,351,81,b437f461b3fd27387c5d8ab47a293d35,34";

TextFieldParser parser = new TextFieldParser(new StringReader(csv));

// You can also read from a file
// TextFieldParser parser = new TextFieldParser("mycsvfile.csv");

parser.HasFieldsEnclosedInQuotes = true;
parser.SetDelimiters(",");

string[] fields;

while (!parser.EndOfData)
{
    fields = parser.ReadFields();
    foreach (string field in fields)
    {
        Console.WriteLine(field);
    }
} 

parser.Close();

This should result in the following output:

2
1016
7/31/2008 14:22
Geoff Dalgas
6/5/2011 22:21
http://stackoverflow.com
Corvallis, OR
7679
351
81
b437f461b3fd27387c5d8ab47a293d35
34

See Microsoft.VisualBasic.FileIO.TextFieldParser for more information.

You need to add a reference to Microsoft.VisualBasic in the Add References .NET tab.

Is there anyway to exclude artifacts inherited from a parent POM?

You can group your dependencies within a different project with packaging pom as described by Sonatypes Best Practices:

<project>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>base-dependencies</artifactId>
    <groupId>es.uniovi.innova</groupId>
    <version>1.0.0</version>
    <packaging>pom</packaging>
    <dependencies>
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4</version>
        </dependency>
    </dependencies>
</project>

and reference them from your parent-pom (watch the dependency <type>pom</type>):

<project>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>base</artifactId>
    <groupId>es.uniovi.innova</groupId>
    <version>1.0.0</version>
    <packaging>pom</packaging>
    <dependencies>
        <dependency>
            <artifactId>base-dependencies</artifactId>
            <groupId>es.uniovi.innova</groupId>
            <version>1.0.0</version>
            <type>pom</type>
        </dependency>
    </dependencies>
</project>

Your child-project inherits this parent-pom as before. But now, the mail dependency can be excluded in the child-project within the dependencyManagement block:

<project>
    <modelVersion>4.0.0</modelVersion>
    <groupId>test</groupId>
    <artifactId>jruby</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <parent>
        <artifactId>base</artifactId>
        <groupId>es.uniovi.innova</groupId>
        <version>1.0.0</version>
    </parent>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <artifactId>base-dependencies</artifactId>
                <groupId>es.uniovi.innova</groupId>
                <version>1.0.0</version>
                <exclusions>
                    <exclusion>
                        <groupId>javax.mail</groupId>
                        <artifactId>mail</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

In Javascript, how do I check if an array has duplicate values?

Well I did a bit of searching around the internet for you and I found this handy link.

Easiest way to find duplicate values in a JavaScript array

You can adapt the sample code that is provided in the above link, courtesy of "swilliams" to your solution.

VS Code - Search for text in all files in a directory

Search across files - Press Ctrl+Shift+F

Find - Press Ctrl+F

Find and Replace - Ctrl+H

For basic editing options follow this link - https://code.visualstudio.com/docs/editor/codebasics

Note : For mac the Ctrl represents the command button

GoTo Next Iteration in For Loop in java

continue;

continue; key word would start the next iteration upon invocation

For Example

for(int i= 0 ; i < 5; i++){
 if(i==2){
  continue;
 }
System.out.print(i);
}

This will print

0134

See

jQuery fade out then fade in

With async functions and promises, it now can work as simply as this:

async function foobar() {
  await $("#example").fadeOut().promise();
  doSomethingElse();
  await $("#example").fadeIn().promise();
}

How to find rows in one table that have no corresponding row in another table

I can't tell you which of these methods will be best on H2 (or even if all of them will work), but I did write an article detailing all of the (good) methods available in TSQL. You can give them a shot and see if any of them works for you:

http://code.msdn.microsoft.com/SQLExamples/Wiki/View.aspx?title=QueryBasedUponAbsenceOfData&referringTitle=Home

Implementing autocomplete

I know you already have several answers, but I was on a similar situation where my team didn't want to depend on a heavy libraries or anything related to bootstrap since we are using material so I made our own autocomplete control, using material-like styles, you can use my autocomplete or at least you can give a look to give you some guiadance, there was not much documentation on simple examples on how to upload your components to be shared on NPM.

Convert character to ASCII numeric value in java

String str = "abc";  // or anything else

// Stores strings of integer representations in sequence
StringBuilder sb = new StringBuilder();
for (char c : str.toCharArray())
    sb.append((int)c);

 // store ascii integer string array in large integer
BigInteger mInt = new BigInteger(sb.toString());
System.out.println(mInt);

Javascript/Jquery to change class onclick?

Another example is:

$(".myClass").on("click", function () {
   var $this = $(this);

   if ($this.hasClass("show") {
    $this.removeClass("show");
   } else {
    $this.addClass("show");
   }
});

Can I try/catch a warning?

Be careful with the @ operator - while it suppresses warnings it also suppresses fatal errors. I spent a lot of time debugging a problem in a system where someone had written @mysql_query( '...' ) and the problem was that mysql support was not loaded into PHP and it threw a silent fatal error. It will be safe for those things that are part of the PHP core but please use it with care.

bob@mypc:~$ php -a
Interactive shell

php > echo @something(); // this will just silently die...

No further output - good luck debugging this!

bob@mypc:~$ php -a
Interactive shell

php > echo something(); // lets try it again but don't suppress the error
PHP Fatal error:  Call to undefined function something() in php shell code on line 1
PHP Stack trace:
PHP   1. {main}() php shell code:0
bob@mypc:~$ 

This time we can see why it failed.

SELECT FOR UPDATE with SQL Server

Recently I had a deadlock problem because Sql Server locks more then necessary (page). You can't really do anything against it. Now we are catching deadlock exceptions... and I wish I had Oracle instead.

Edit: We are using snapshot isolation meanwhile, which solves many, but not all of the problems. Unfortunately, to be able to use snapshot isolation it must be allowed by the database server, which may cause unnecessary problems at customers site. Now we are not only catching deadlock exceptions (which still can occur, of course) but also snapshot concurrency problems to repeat transactions from background processes (which cannot be repeated by the user). But this still performs much better than before.

Open existing file, append a single line

Or you could use File.AppendAllLines(string, IEnumerable<string>)

File.AppendAllLines(@"C:\Path\file.txt", new[] { "my text content" });

How to change package name in flutter?

Even if my answer wont be accepted as the correct answer, I just feel all these answers above caused me to have more problems here is how I fixed it

  1. Get Sublime Text (crazy, right? No, just follow my steps)
  2. Click on file and select open folder, then choose the folder of the project you are working on
  3. Now click on Find from the Tabs, and select find in files or just do Ctrl + Shift + F (for Windows users, for mac users you already know the drill)
  4. Now copy and paste exactly the name of the package you want to change in the Find section and paste in the replace section what you would like to replace the package name with.
  5. Click on FIND (do not click on REPLACE just yet).
  6. Now clicking on Find lists all available package name in your project which matches your search criteria, if you are satisfied with this then repeat from no. 3 but this time click on REPLACE.
  7. Rebuild your project and have fun

Conclusion: a simple find and replace program is all you need to sort this problem out, and I strongly recommend Sublime Text 3 for that.

keytool error Keystore was tampered with, or password was incorrect

Check your home folder ~/.gradle/gradle.properties. Sometimes if you have gradle.properties in home directory it takes details from the there. Either you can change that or delete the files. Then it will take required details from your local folder.

Build error: You must add a reference to System.Runtime

It's an old issue but I faced it today in order to fix a build pipeline on our continuous integration server. Adding

<Reference Include="System.Runtime" />

to my .csproj file solved the problem for me.

A bit of context: the interested project is a full .NET Framework 4.6.1 project, without build problem on the development machines. The problem appears only on the build server, which we can't control, may be due to a different SDK version or something similar.

Adding the proposed <Reference solved the build error, at the price of a missing reference warning (yellow triangle on the added entry in the references tree) in Visual Studio.

Get google map link with latitude/longitude

None of the above answers worked for me, but I got it working with the following:

src="'https://maps.google.com/maps?q=' + lat + ',' + long + '&t=&z=15&ie=UTF8&iwloc=&output=embed'"

Extract file basename without path and extension in bash

The basename command has two different invocations; in one, you specify just the path, in which case it gives you the last component, while in the other you also give a suffix that it will remove. So, you can simplify your example code by using the second invocation of basename. Also, be careful to correctly quote things:

fbname=$(basename "$1" .txt)
echo "$fbname"

addEventListener not working in IE8

Try:

if (_checkbox.addEventListener) {
    _checkbox.addEventListener("click", setCheckedValues, false);
}
else {
    _checkbox.attachEvent("onclick", setCheckedValues);
}

Update:: For Internet Explorer versions prior to IE9, attachEvent method should be used to register the specified listener to the EventTarget it is called on, for others addEventListener should be used.

How do I change the language of moment.js?

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>MomentJS</title>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.2/jquery.min.js"></script>
    <script type="text/javascript" src="moment.js"></script>
    <script type="text/javascript" src="locale/ne.js"></script>
</head>
<body>
    <script>
        jQuery(document).ready(function($) {
            moment.locale('en'); // default the locale to English
            var localLocale = moment();

            moment.locale('ne'); // change the global locale to Nepalese
            var ne1 = localLocale.format('LLLL');
            var ne2 = moment().format('LLLL');

            $('.ne1').text(ne1);
            $('.ne2').text(ne2);
        });
    </script>
    <p class="ne1"></p>
    <p class="ne2"></p>
</body>
</html>

Demo

Getting HTML elements by their attribute names

You can get attribute using javascript,

element.getAttribute(attributeName);

Ex:

var wrap = document.getElementById("wrap");
var myattr = wrap.getAttribute("title");

Refer:

https://developer.mozilla.org/en/DOM/element.getAttribute

Accessing JSON object keys having spaces

The answer of Pardeep Jain can be useful for static data, but what if we have an array in JSON?

For example, we have i values and get the value of id field

alert(obj[i].id); //works!

But what if we need key with spaces?

In this case, the following construction can help (without point between [] blocks):

alert(obj[i]["No. of interfaces"]); //works too!

How to output an Excel *.xls file from classic ASP

There's a 'cheap and dirty' trick that I have used... shhhh don't tell anyone. If you output tab delimited text and make the file name *.xls then Excel opens it without objection, question or warning. So just crank the data out into a text file with tab delimitation and you can open it with Excel or Open Office.

Spring Data and Native Query with pagination

I'm using the code below. working

@Query(value = "select * from user usr" +
  "left join apl apl on usr.user_id = apl.id" +
  "left join lang on lang.role_id = usr.role_id" +
  "where apl.scr_name like %:scrname% and apl.uname like %:uname and usr.role_id in :roleIds ORDER BY ?#{#pageable}",
  countQuery = "select count(*) from user usr" +
      "left join apl apl on usr.user_id = apl.id" +
      "left join lang on lang.role_id = usr.role_id" +
      "where apl.scr_name like %:scrname% and apl.uname like %:uname and usr.role_id in :roleIds",
  nativeQuery = true)
Page<AplUserEntity> searchUser(@Param("scrname") String scrname,@Param("uname") String  uname,@Param("roleIds") List<Long> roleIds,Pageable pageable);

Android: show/hide a view using an animation

I have used this two function to hide and show view with transition animation smoothly.

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public void expand(final View v, int duration, int targetHeight, final int position) {

        int prevHeight = v.getHeight();

        v.setVisibility(View.VISIBLE);
        ValueAnimator valueAnimator = ValueAnimator.ofInt(0, targetHeight);
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                v.getLayoutParams().height = (int) animation.getAnimatedValue();
                v.requestLayout();
            }
        });
        valueAnimator.setInterpolator(new DecelerateInterpolator());
        valueAnimator.setDuration(duration);
        valueAnimator.start();
        valueAnimator.addListener(new AnimatorListenerAdapter() {

            @Override
            public void onAnimationEnd(Animator animation) {
                v.clearAnimation();
            }
        });

    }

    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    public void collapse(final View v, int duration, int targetHeight, final int position) {
        if (position == (data.size() - 1)) {
            return;
        }
        int prevHeight = v.getHeight();
        ValueAnimator valueAnimator = ValueAnimator.ofInt(prevHeight, targetHeight);
        valueAnimator.setInterpolator(new DecelerateInterpolator());
        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                v.getLayoutParams().height = (int) animation.getAnimatedValue();
                v.requestLayout();
            }
        });
        valueAnimator.setInterpolator(new DecelerateInterpolator());
        valueAnimator.setDuration(duration);
        valueAnimator.start();
        valueAnimator.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                animBoolArray.put(position, false);
                v.clearAnimation();

            }
        });
    }

SQL Server copy all rows from one table into another i.e duplicate table

Either you can use RAW SQL:

INSERT INTO DEST_TABLE (Field1, Field2) 
SELECT Source_Field1, Source_Field2 
FROM SOURCE_TABLE

Or use the wizard:

  1. Right Click on the Database -> Tasks -> Export Data
  2. Select the source/target Database
  3. Select source/target table and fields
  4. Copy the data

Then execute:

TRUNCATE TABLE SOURCE_TABLE

How to assign bean's property an Enum value in Spring config file?

Spring-integration example, routing based on a an Enum field:

public class BookOrder {

    public enum OrderType { DELIVERY, PICKUP } //enum
    public BookOrder(..., OrderType orderType) //orderType
    ...

config:

<router expression="payload.orderType" input-channel="processOrder">
    <mapping value="DELIVERY" channel="delivery"/>
    <mapping value="PICKUP" channel="pickup"/>
</router>

Forwarding port 80 to 8080 using NGINX

Simple is:

server {
    listen   80;
    server_name  p3000;
    location / {
        proxy_pass http://0.0.0.0:3000;
        include /etc/nginx/proxy_params;
    }
}

What's the simplest way of detecting keyboard input in a script from the terminal?

Inspired from code found above (credits), the simple blocking (aka not CPU consuming) macOS version I was looking for:

import termios
import sys
import fcntl
import os

def getKeyCode(blocking = True):
    fd = sys.stdin.fileno()
    oldterm = termios.tcgetattr(fd)
    newattr = termios.tcgetattr(fd)
    newattr[3] = newattr[3] & ~termios.ICANON & ~termios.ECHO
    termios.tcsetattr(fd, termios.TCSANOW, newattr)
    if not blocking:
        oldflags = fcntl.fcntl(fd, fcntl.F_GETFL)
        fcntl.fcntl(fd, fcntl.F_SETFL, oldflags | os.O_NONBLOCK)
    try:
        return ord(sys.stdin.read(1))
    except IOError:
        return 0
    finally:
        termios.tcsetattr(fd, termios.TCSAFLUSH, oldterm)
        if not blocking:
            fcntl.fcntl(fd, fcntl.F_SETFL, oldflags)

def getKeyStroke():
    code  = getKeyCode()
    if code == 27:
        code2 = getKeyCode(blocking = False)
        if code2 == 0:
            return "esc"
        elif code2 == 91:
            code3 = getKeyCode(blocking = False)
            if code3 == 65:
                return "up"
            elif code3 == 66:
                return "down"
            elif code3 == 68:
                return "left"
            elif code3 == 67:
                return "right"
            else:
                return "esc?"
    elif code == 127:
        return "backspace"
    elif code == 9:
        return "tab"
    elif code == 10:
        return "return"
    elif code == 195 or code == 194:        
        code2 = getKeyCode(blocking = False)
        return chr(code)+chr(code2) # utf-8 char
    else:
        return chr(code)


while True:
    print getKeyStroke()

2017-11-09, EDITED: Not tested with Python 3

How to use Checkbox inside Select Option

Only add class create div and add class form-control. iam use JSP,boostrap4. Ignore c:foreach.

<div class="multi-select form-control" style="height:107.292px;">
        <div class="checkbox" id="checkbox-expedientes">
            <c:forEach var="item" items="${postulantes}">
                <label class="form-check-label">
                    <input id="options" class="postulantes" type="checkbox" value="1">Option 1</label>
            </c:forEach>
        </div>
    </div>

Why does the Visual Studio editor show dots in blank spaces?

Looks like you have the view white space option enabled. Go to Edit -> Advanced -> and uncheck "View Whitespace"

COPYing a file in a Dockerfile, no such file or directory?

I know this is old, but something to point out. If you think everything is as its supposed to, check your .gitignore file :)

You might have the folder locally, but if the folder is in your git ignore then its not on the server, which means Docker cannot find that folder as it does not exist.

Get height of div with no height set in css

Just a note in case others have the same problem.

I had the same problem and found a different answer. I found that getting the height of a div that's height is determined by its contents needs to be initiated on window.load, or window.scroll not document.ready otherwise i get odd heights/smaller heights, i.e before the images have loaded. I also used outerHeight().

var currentHeight = 0;
$(window).load(function() {
    //get the natural page height -set it in variable above.

    currentHeight = $('#js_content_container').outerHeight();

    console.log("set current height on load = " + currentHeight)
    console.log("content height function (should be 374)  = " + contentHeight());   

});

How to get dictionary values as a generic list

Off course, myDico.Values is List<List<MyType>>.

Use Linq if you want to flattern your lists

var items = myDico.SelectMany (d => d.Value).ToList();

How to register multiple servlets in web.xml in one Spring application

Use config something like this:

<context-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>/WEB-INF/applicationContext.xml</param-value>
</context-param>

<listener>
  <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<servlet>
  <servlet-name>myservlet</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
</servlet>

<servlet>
  <servlet-name>user-webservice</servlet-name>
  <servlet-class>org.apache.cxf.transport.servlet.CXFServlet</servlet-class>
  <load-on-startup>2</load-on-startup>
</servlet>

and then you'll need three files:

  • applicationContext.xml;
  • myservlet-servlet.xml; and
  • user-webservice-servlet.xml.

The *-servlet.xml files are used automatically and each creates an application context for that servlet.

From the Spring documentation, 13.2. The DispatcherServlet:

The framework will, on initialization of a DispatcherServlet, look for a file named [servlet-name]-servlet.xml in the WEB-INF directory of your web application and create the beans defined there (overriding the definitions of any beans defined with the same name in the global scope).

How to count the number of true elements in a NumPy bool array

You have multiple options. Two options are the following.

numpy.sum(boolarr)
numpy.count_nonzero(boolarr)

Here's an example:

>>> import numpy as np
>>> boolarr = np.array([[0, 0, 1], [1, 0, 1], [1, 0, 1]], dtype=np.bool)
>>> boolarr
array([[False, False,  True],
       [ True, False,  True],
       [ True, False,  True]], dtype=bool)

>>> np.sum(boolarr)
5

Of course, that is a bool-specific answer. More generally, you can use numpy.count_nonzero.

>>> np.count_nonzero(boolarr)
5

Run a vbscript from another vbscript

Just to complete, you could send 3 arguments like this:

objShell.Run "TestScript.vbs 42 ""an arg containing spaces"" foo" 

Exit single-user mode

Press CTRL + 1

find the process that locks your database. Look in column dbname for your db and note the spid. Now you have to execute that statement:

kill <your spid>
ALTER DATABASE <your db> SET MULTI_USER;

How to use find command to find all files with extensions from list?

in case files have no extension we can look for file mime type

find . -type f -exec file -i {} + | awk -F': +' '{ if ($2 ~ /audio|video|matroska|mpeg/) print $1 }'

where (audio|video|matroska|mpeg) are mime types regex

&if you want to delete them:

find . -type f -exec file -i {} + | awk -F': +' '{ if ($2 ~ /audio|video|matroska|mpeg/) print $1 }' | while read f ; do
  rm "$f"
done

or delete everything else but those extensions:

find . -type f -exec file -i {} + | awk -F': +' '{ if ($2 !~ /audio|video|matroska|mpeg/) print $1 }' | while read f ; do
  rm "$f"
done

notice the !~ instead of ~

How can I execute PHP code from the command line?

Using PHP from the command line

Use " instead of ' on Windows when using the CLI version with -r:

php -r "echo 1;"

-- correct

php -r 'echo 1;'

-- incorrect

  PHP Parse error:  syntax error, unexpected ''echo' (T_ENCAPSED_AND_WHITESPACE), expecting end of file in Command line code on line 1

Don't forget the semicolon to close the line.

jQuery AJAX form data serialize using PHP

<form method="post" name="myForm" id="myForm">

replace with above form tag remove action from form tag. and set url : "check.php" in ajax in your case first it goes to jQuery ajax then submit again the form. that's why it's creating issue.

i know i'm too late for this reply but i think it would help.

How can I jump to class/method definition in Atom text editor?

I also had the same problem. And I find the solution:

CTRL+ALT+G

Update:

Thanks to @Joost, install Atom package python-tools to make it work

Indent multiple lines quickly in vi

Do this:

$vi .vimrc

And add this line:

autocmd FileType cpp setlocal expandtab shiftwidth=4 softtabstop=4 cindent

This is only for a cpp file. You can do this for another file type, also just by modifying the filetype...

How can I exit from a javascript function?

You should use return as in:

function refreshGrid(entity) {
  var store = window.localStorage;
  var partitionKey;
  if (exit) {
    return;
  }

"Debug only" code that should run only when "turned on"

If you want to know whether if debugging, everywhere in program. Use this.

Declare global variable.

bool isDebug=false;

Create function for checking debug mode

[ConditionalAttribute("DEBUG")]
    public static void isDebugging()
    {
        isDebug = true;
    }

In the initialize method call the function

isDebugging();

Now in the entire program. You can check for debugging and do the operations. Hope this Helps!

What's HTML character code 8203?

If you're seeing these in a source be aware that it may be someone attempting to fingerprint text documents to reveal who is leaking information. It also may be an attempt to bypass a spam filter by making the same looking information different on a byte-by-byte level.

See my article on mitigating fingerprinting if you're interested in learning more.

Binding select element to object in Angular

In app.component.html:

 <select type="number" [(ngModel)]="selectedLevel">
          <option *ngFor="let level of levels" [ngValue]="level">{{level.name}}</option>
        </select>

And app.component.ts:

import { Component } from '@angular/core';

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  levelNum:number;
  levels:Array<Object> = [
      {num: 0, name: "AA"},
      {num: 1, name: "BB"}
  ];

  toNumber(){
    this.levelNum = +this.levelNum;
    console.log(this.levelNum);
  }

  selectedLevel = this.levels[0];

  selectedLevelCustomCompare = {num: 1, name: "BB"}

  compareFn(a, b) {
    console.log(a, b, a && b && a.num == b.num);
    return a && b && a.num == b.num;
  }
}

How to get parameter value for date/time column from empty MaskedTextBox

You're storing the .Text properties of the textboxes directly into the database, this doesn't work. The .Text properties are Strings (i.e. simple text) and not typed as DateTime instances. Do the conversion first, then it will work.

Do this for each date parameter:

Dim bookIssueDate As DateTime = DateTime.ParseExact( txtBookDateIssue.Text, "dd/MM/yyyy", CultureInfo.InvariantCulture ) cmd.Parameters.Add( New OleDbParameter("@Date_Issue", bookIssueDate ) ) 

Note that this code will crash/fail if a user enters an invalid date, e.g. "64/48/9999", I suggest using DateTime.TryParse or DateTime.TryParseExact, but implementing that is an exercise for the reader.

SQL subquery with COUNT help

Do you want to get the number of rows?

SELECT columnName, COUNT(*) AS row_count
FROM eventsTable
WHERE columnName = 'Business'
GROUP BY columnName

How do I remove time part from JavaScript date?

Parse that string into a Date object:

var myDate = new Date('10/11/1955 10:40:50 AM');

Then use the usual methods to get the date's day of month (getDate) / month (getMonth) / year (getFullYear).

var noTime = new Date(myDate.getFullYear(), myDate.getMonth(), myDate.getDate());

Java: Identifier expected

You can't call methods outside a method. Code like this cannot float around in the class.

You need something like:

public class MyClass {

  UserInput input = new UserInput();

  public void foo() {
      input.name();
  }
}

or inside a constructor:

public class MyClass {

  UserInput input = new UserInput();

  public MyClass() {
      input.name();
  }
}

java.lang.NoClassDefFoundError: javax/mail/Authenticator, whats wrong?

Even I was facing a similar error. Try below 2 steps (the first of which has been recommended here already) - 1. Add the dependencies to your pom.xml

         <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4.5</version>
        </dependency>

        <dependency>
            <groupId>javax.activation</groupId>
            <artifactId>activation</artifactId>
            <version>1.1.1</version>
        </dependency>
  1. If that doesn't work, manually place the jar files in your .m2\repository\javax\<folder>\<version>\ directory.

How to get the input from the Tkinter Text Widget?

I think this is a better way-

variable1=StringVar() # Value saved here

def search():
  print(variable1.get())
  return ''

ttk.Entry(mainframe, width=7, textvariable=variable1).grid(column=2, row=1)

ttk.Label(mainframe, text="label").grid(column=1, row=1)

ttk.Button(mainframe, text="Search", command=search).grid(column=2, row=13)

On pressing the button, the value in the text field would get printed. But make sure You import the ttk separately.

The full code for a basic application is-

from tkinter import *
from tkinter import ttk

root=Tk()
mainframe = ttk.Frame(root, padding="10 10 12 12")
mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
mainframe.columnconfigure(0, weight=1)
mainframe.rowconfigure(0, weight=1)


variable1=StringVar() # Value saved here

def search():
  print(variable1.get())
  return ''

ttk.Entry(mainframe, width=7, textvariable=variable1).grid(column=2, row=1)

ttk.Label(mainframe, text="label").grid(column=1, row=1)

ttk.Button(mainframe, text="Search", command=search).grid(column=2, row=13)

root.mainloop()

MVC 3: How to render a view without its layout page when loaded via ajax?

You don't have to create an empty view for this.

In the controller:

if (Request.IsAjaxRequest())
  return PartialView();
else
  return View();

returning a PartialViewResult will override the layout definition when rendering the respons.

Is it ok to run docker from inside docker?

Yes, we can run docker in docker, we'll need to attach the unix sockeet "/var/run/docker.sock" on which the docker daemon listens by default as volume to the parent docker using "-v /var/run/docker.sock:/var/run/docker.sock". Sometimes, permissions issues may arise for docker daemon socket for which you can write "sudo chmod 757 /var/run/docker.sock".

And also it would require to run the docker in privileged mode, so the commands would be:

sudo chmod 757 /var/run/docker.sock

docker run --privileged=true -v /var/run/docker.sock:/var/run/docker.sock -it ...

No converter found capable of converting from type to type

If you look at the exception stack trace it says that, it failed to convert from ABDeadlineType to DeadlineType. Because your repository is going to return you the objects of ABDeadlineType. How the spring-data-jpa will convert into the other one(DeadlineType). You should return the same type from repository and then have some intermediate util class to convert it into your model class.

public interface ABDeadlineTypeRepository extends JpaRepository<ABDeadlineType, Long> {
    List<ABDeadlineType> findAllSummarizedBy();
}

jQuery - If element has class do this

First, you're missing some parentheses in your conditional:

if ($("#about").hasClass("opened")) {
  $("#about").animate({right: "-700px"}, 2000);
}

But you can also simplify this to:

$('#about.opened').animate(...);

If #about doesn't have the opened class, it won't animate.

If the problem is with the animation itself, we'd need to know more about your element positioning (absolute? absolute inside relative parent? does the parent have layout?)

How can I set a custom date time format in Oracle SQL Developer?

You can change this in preferences:

  1. From Oracle SQL Developer's menu go to: Tools > Preferences.
  2. From the Preferences dialog, select Database > NLS from the left panel.
  3. From the list of NLS parameters, enter DD-MON-RR HH24:MI:SS into the Date Format field.
  4. Save and close the dialog, done!

Here is a screenshot:

Changing Date Format preferences in Oracle SQL Developer

How to close jQuery Dialog within the dialog?

you can close it programmatically by calling

$('#form-dialog').dialog('close')

whenever you want.

Hide password with "•••••••" in a textField

You can achieve this directly in Xcode:

enter image description here

The very last checkbox, make sure secure is checked .

Or you can do it using code:

Identifies whether the text object should hide the text being entered.

Declaration

optional var secureTextEntry: Bool { get set }

Discussion

This property is set to false by default. Setting this property to true creates a password-style text object, which hides the text being entered.

example:

texfield.secureTextEntry = true

How do I invoke a Java method when given the method name as a string?

Indexing (faster)

You can use FunctionalInterface to save methods in a container to index them. You can use array container to invoke them by numbers or hashmap to invoke them by strings. By this trick, you can index your methods to invoke them dynamically faster.

@FunctionalInterface
public interface Method {
    double execute(int number);
}

public class ShapeArea {
    private final static double PI = 3.14;

    private Method[] methods = {
        this::square,
        this::circle
    };

    private double square(int number) {
        return number * number;
    }

    private double circle(int number) {
        return PI * number * number;
    }

    public double run(int methodIndex, int number) {
        return methods[methodIndex].execute(number);
    }
}

Lambda syntax

You can also use lambda syntax:

public class ShapeArea {
    private final static double PI = 3.14;

    private Method[] methods = {
        number -> {
            return number * number;
        },
        number -> {
            return PI * number * number;
        },
    };

    public double run(int methodIndex, int number) {
        return methods[methodIndex].execute(number);
    }
}

PHP Convert String into Float/Double

If the function floatval does not work you can try to make this :

    $string = "2968789218";
    $float = $string * 1.0;
    echo $float;

But for me all the previous answer worked ( try it in http://writecodeonline.com/php/ ) Maybe the problem is on your server ?

How to get root view controller?

As suggested here by @0x7fffffff, if you have UINavigationController it can be easier to do:

YourViewController *rootController =
    (YourViewController *)
        [self.navigationController.viewControllers objectAtIndex: 0];

The code in the answer above returns UINavigation controller (if you have it) and if this is what you need, you can use self.navigationController.

How to open CSV file in R when R says "no such file or directory"?

Sound like you just have an issue with the path. Include the full path, if you use backslashes they need to be escaped: "C:\\folder\\folder\\Desktop\\file.csv" or "C:/folder/folder/Desktop/file.csv".

myfile = read.csv("C:/folder/folder/Desktop/file.csv")  # or read.table()

It may also be wise to avoid spaces and symbols in your file names, though I'm fairly certain spaces are OK.

PHP date() format when inserting into datetime in MySQL

Format time stamp to MySQL DATETIME column :

strftime('%Y-%m-%d %H:%M:%S',$timestamp);

Limit characters displayed in span

Yes, sort of.

You can explicitly size a container using units relative to font-size:

  • 1em = 'the horizontal width of the letter m'
  • 1ex = 'the vertical height of the letter x'
  • 1ch = 'the horizontal width of the number 0'

In addition you can use a few CSS properties such as overflow:hidden; white-space:nowrap; text-overflow:ellipsis; to help limit the number as well.

What's "tools:context" in Android layout files?

<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    //more views

</androidx.constraintlayout.widget.ConstraintLayout>

In the above code, the basic need of tools:context is to tell which activity or fragment the layout file is associated with by default. So, you can specify the activity class name using the same dot prefix as used in Manifest file.

By doing so, the Android Studio will choose the necessary theme for the preview automatically and you don’t have to do the preview settings manually. As we all know that a layout file can be associated with several activities but the themes are defined in the Manifest file and these themes are associated with your activity. So, by adding tools:context in your layout file, the Android Studio preview will automatically choose the necessary theme for you.

Get OS-level system information

I think the best method out there is to implement the SIGAR API by Hyperic. It works for most of the major operating systems ( darn near anything modern ) and is very easy to work with. The developer(s) are very responsive on their forum and mailing lists. I also like that it is GPL2 Apache licensed. They provide a ton of examples in Java too!

SIGAR == System Information, Gathering And Reporting tool.

Determine device (iPhone, iPod Touch) with iOS

The possible vales of

[[UIDevice currentDevice] model];

are iPod touch, iPhone, iPhone Simulator, iPad, iPad Simulator

If you want to know which hardware iOS is ruining on like iPhone3, iPhone4, iPhone5 etc below is the code for that


NOTE: The below code may not contain all device's string, I'm with other guys are maintaining the same code on GitHub so please take the latest code from there

Objective-C : GitHub/DeviceUtil

Swift : GitHub/DeviceGuru


#include <sys/types.h>
#include <sys/sysctl.h>

- (NSString*)hardwareDescription {
    NSString *hardware = [self hardwareString];
    if ([hardware isEqualToString:@"iPhone1,1"]) return @"iPhone 2G";
    if ([hardware isEqualToString:@"iPhone1,2"]) return @"iPhone 3G";
    if ([hardware isEqualToString:@"iPhone3,1"]) return @"iPhone 4";
    if ([hardware isEqualToString:@"iPhone4,1"]) return @"iPhone 4S";
    if ([hardware isEqualToString:@"iPhone5,1"]) return @"iPhone 5";
    if ([hardware isEqualToString:@"iPod1,1"]) return @"iPodTouch 1G";
    if ([hardware isEqualToString:@"iPod2,1"]) return @"iPodTouch 2G";
    if ([hardware isEqualToString:@"iPad1,1"]) return @"iPad";
    if ([hardware isEqualToString:@"iPad2,6"]) return @"iPad Mini";
    if ([hardware isEqualToString:@"iPad4,1"]) return @"iPad Air WIFI";
    //there are lots of other strings too, checkout the github repo
    //link is given at the top of this answer

    if ([hardware isEqualToString:@"i386"]) return @"Simulator";
    if ([hardware isEqualToString:@"x86_64"]) return @"Simulator";

    return nil;
}

- (NSString*)hardwareString {
    size_t size = 100;
    char *hw_machine = malloc(size);
    int name[] = {CTL_HW,HW_MACHINE};
    sysctl(name, 2, hw_machine, &size, NULL, 0);
    NSString *hardware = [NSString stringWithUTF8String:hw_machine];
    free(hw_machine);
    return hardware;
}

Regular expression to match DNS hostname or IP Address?

The hostname regex of smink does not observe the limitation on the length of individual labels within a hostname. Each label within a valid hostname may be no more than 63 octets long.

ValidHostnameRegex="^([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])\
(\.([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]{0,61}[a-zA-Z0-9]))*$"

Note that the backslash at the end of the first line (above) is Unix shell syntax for splitting the long line. It's not a part of the regular expression itself.

Here's just the regular expression alone on a single line:

^([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]{0,61}[a-zA-Z0-9])(\.([a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]{0,61}[a-zA-Z0-9]))*$

You should also check separately that the total length of the hostname must not exceed 255 characters. For more information, please consult RFC-952 and RFC-1123.

Example on ToggleButton

You should follow the Google guide;

ToggleButton toggle = (ToggleButton) findViewById(R.id.togglebutton);
toggle.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if (isChecked) {
            // The toggle is enabled
        } else {
            // The toggle is disabled
        }
    }
});

You can check the documentation here

Returning Month Name in SQL Server Query

for me DATENAME was not accessable due to company restrictions.... but this worked very easy too.

FORMAT(date, 'MMMM') AS month

Using gradle to find dependency tree

In Android Studio

1) Open terminal and ensure you are at project's root folder.

2) Run ./gradlew app:dependencies (if not using gradle wrapper, try gradle app:dependencies)

Note that running ./gradle dependencies will only give you dependency tree of project's root folder, so mentioning app in above manner, i.e. ./gradlew app:dependencies is important.

How to determine if string contains specific substring within the first X characters

A more explicit version is

found = Value1.StartsWith("abc", StringComparison.Ordinal);

It's best to always explicitly list the particular comparison you are doing. The String class can be somewhat inconsistent with the type of comparisons that are used.

creating charts with angularjs

The ZingChart library has an AngularJS directive that was built in-house. Features include:

  • Full access to the entire ZingChart library (all charts, maps, and features)
  • Takes advantage of Angular's 2-way data binding, making data and chart elements easy to update
  • Support from the development team

    ...
    $scope.myJson = {
    type : 'line',
       series : [
          { values : [54,23,34,23,43] },{ values : [10,15,16,20,40] }
       ]
    };
    ...
    
    <zingchart id="myChart" zc-json="myJson" zc-height=500 zc-width=600></zingchart>
    

There is a full demo with code examples available.

Implement Validation for WPF TextBoxes

When it comes to DiSaSteR's answer, I noticed a different behavior. textBox.Text shows the text in the TextBox as it was before the user entered a new character, while e.Text shows the single character the user just entered. One challenge is that this character might not get appended to the end, but it will be inserted at the carret position:

private void salary_texbox_PreviewTextInput(object sender, TextCompositionEventArgs e){
  Regex regex = new Regex ( "[^0-9]+" );

  string text;
  if (textBox.CaretIndex==textBox.Text.Length) {
    text = textBox.Text + e.Text;
  } else {
    text = textBox.Text.Substring(0, textBox.CaretIndex)  + e.Text + textBox.Text.Substring(textBox.CaretIndex);
  }

  if(regex.IsMatch(text)){
      MessageBox.Show("Error");
  }
}

How do I populate a JComboBox with an ArrayList?

I don't like the accepted answer or @fivetwentysix's comment regarding how to solve this. It gets at one method for doing this, but doesn't give the full solution to using toArray. You need to use toArray and give it an argument that's an array of the correct type and size so that you don't end up with an Object array. While an object array will work, I don't think it's best practice in a strongly typed language.

String[] array = arrayList.toArray(new String[arrayList.size()]);
JComboBox comboBox = new JComboBox(array);

Alternatively, you can also maintain strong typing by just using a for loop.

String[] array = new String[arrayList.size()];
for(int i = 0; i < array.length; i++) {
    array[i] = arrayList.get(i);
}
JComboBox comboBox = new JComboBox(array);

What's wrong with foreign keys?

Foreign keys are essential to any relational database model.

CodeIgniter PHP Model Access "Unable to locate the model you have specified"

In CodeIgniter 3.0-dev (get it from github) this is not working because the CI is search as first letter uppercase.

You can find the code on system/core/Loader.php line 282 or bellow:

$model = ucfirst(strtolower($model));

foreach ($this->_ci_model_paths as $mod_path)
{
    if ( ! file_exists($mod_path.'models/'.$path.$model.'.php'))
    {
        continue;
    }

    require_once($mod_path.'models/'.$path.$model.'.php');

    $CI->$name = new $model();
    $this->_ci_models[] = $name;
    return $this;
}

This mean that we need to create the file with the following name on application/models/Logon_mode.php

Postgres user does not exist?

For me This was the solution on macOS ReInstall the psql

brew install postgres

Start PostgreSQL server

pg_ctl -D /usr/local/var/postgres start

Initialize DB

initdb /usr/local/var/postgres

If this command throws an error the rm the old database file and re-run the above command

rm -r /usr/local/var/postgres

Create a new database

createdb postgres_test
psql -W postegres_test

You will be logged into this db and can create a user in here to login

Where to put the gradle.properties file

Actually there are 3 places where gradle.properties can be placed:

  1. Under gradle user home directory defined by the GRADLE_USER_HOME environment variable, which if not set defaults to USER_HOME/.gradle
  2. The sub-project directory (myProject2 in your case)
  3. The root project directory (under myProject)

Gradle looks for gradle.properties in all these places while giving precedence to properties definition based on the order above. So for example, for a property defined in gradle user home directory (#1) and the sub-project (#2) its value will be taken from gradle user home directory (#1).

You can find more details about it in gradle documentation here.

Microsoft Web API: How do you do a Server.MapPath?

string root = HttpContext.Current.Server.MapPath("~/App_Data");

Taskkill /f doesn't kill a process

I did the following, on an elevated powershell:

PS C:\Windows\system32> wmic.exe /interactive:off process where "name like `'java%'`" call terminate

command Output:

Executing (\\SRV\ROOT\CIMV2:Win32_Process.Handle="3064")->terminate()
Method execution successful.

Out Parameters:

instance of __PARAMETERS
{ReturnValue = 0; };

I got some syntax information on : https://community.spiceworks.com/topic/871561-wmic-error-like-invalid-alias-verb

Passing a variable from node.js to html

To pass variables from node.js to html by using the res.render() method.

Example:

var bodyParser = require('body-parser');
var express = require('express');
var app = express();

app.use(express.static(__dirname + '/'));
app.use(bodyParser.urlencoded({extend:true}));
app.engine('html', require('ejs').renderFile);
app.set('view engine', 'html');
app.set('views', __dirname);

app.get('/', function(req, res){
    res.render('index.html',{email:data.email,password:data.password});
});

How can I do an OrderBy with a dynamic string parameter?

You need to use the LINQ Dynamic Query Library in order to pass parameters at runtime,

This will allow linq statements like

string orderedBy = "Description";
var query = (from p in products
            orderby(orderedBy)
            select p);

Sorting Characters Of A C++ String

There is a sorting algorithm in the standard library, in the header <algorithm>. It sorts inplace, so if you do the following, your original word will become sorted.

std::sort(word.begin(), word.end());

If you don't want to lose the original, make a copy first.

std::string sortedWord = word;
std::sort(sortedWord.begin(), sortedWord.end());

fast way to copy formatting in excel

For me, you can't. But if that suits your needs, you could have speed and formatting by copying the whole range at once, instead of looping:

range("B2:B5002").Copy Destination:=Sheets("Output").Cells(startrow, 2)

And, by the way, you can build a custom range string, like Range("B2:B4, B6, B11:B18")


edit: if your source is "sparse", can't you just format the destination at once when the copy is finished ?

How to open a folder in Windows Explorer from VBA?

Thanks to PhilHibbs comment (on VBwhatnow's answer) I was finally able to find a solution that both reuses existing windows and avoids flashing a CMD-window at the user:

Dim path As String
path = CurrentProject.path & "\"
Shell "cmd /C start """" /max """ & path & """", vbHide

where 'path' is the folder you want to open.

(In this example I open the folder where the current workbook is saved.)

Pros:

  • Avoids opening new explorer instances (only sets focus if window exists).
  • The cmd-window is never visible thanks to vbHide.
  • Relatively simple (does not need to reference win32 libraries).

Cons:

  • Window maximization (or minimization) is mandatory.

Explanation:

At first I tried using only vbHide. This works nicely... unless there is already such a folder opened, in which case the existing folder window becomes hidden and disappears! You now have a ghost window floating around in memory and any subsequent attempt to open the folder after that will reuse the hidden window - seemingly having no effect.

In other words when the 'start'-command finds an existing window the specified vbAppWinStyle gets applied to both the CMD-window and the reused explorer window. (So luckily we can use this to un-hide our ghost-window by calling the same command again with a different vbAppWinStyle argument.)

However by specifying the /max or /min flag when calling 'start' it prevents the vbAppWinStyle set on the CMD window from being applied recursively. (Or overrides it? I don't know what the technical details are and I'm curious to know exactly what the chain of events is here.)

Setting font on NSAttributedString on UITextView disregards line spacing

//For proper line spacing

NSString *text1 = @"Hello";
NSString *text2 = @"\nWorld";
UIFont *text1Font = [UIFont fontWithName:@"HelveticaNeue-Medium" size:10];
NSMutableAttributedString *attributedString1 =
[[NSMutableAttributedString alloc] initWithString:text1 attributes:@{ NSFontAttributeName : text1Font }];
NSMutableParagraphStyle *paragraphStyle1 = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle1 setAlignment:NSTextAlignmentCenter];
[paragraphStyle1 setLineSpacing:4];
[attributedString1 addAttribute:NSParagraphStyleAttributeName value:paragraphStyle1 range:NSMakeRange(0, [attributedString1 length])];

UIFont *text2Font = [UIFont fontWithName:@"HelveticaNeue-Medium" size:16];
NSMutableAttributedString *attributedString2 =
[[NSMutableAttributedString alloc] initWithString:text2 attributes:@{NSFontAttributeName : text2Font }];
NSMutableParagraphStyle *paragraphStyle2 = [[NSMutableParagraphStyle alloc] init];
[paragraphStyle2 setLineSpacing:4];
[paragraphStyle2 setAlignment:NSTextAlignmentCenter];
[attributedString2 addAttribute:NSParagraphStyleAttributeName value:paragraphStyle2 range:NSMakeRange(0, [attributedString2 length])];

[attributedString1 appendAttributedString:attributedString2];

How to get the first 2 letters of a string in Python?

All previous examples will raise an exception in case your string is not long enough.

Another approach is to use 'yourstring'.ljust(100)[:100].strip().

This will give you first 100 chars. You might get a shorter string in case your string last chars are spaces.

problem with php mail 'From' header

In order to prevent phishing, some mail servers prevent the From from being rewritten.

Change default icon

Run it not through Visual Studio - then the icon should look just fine.

I believe it is because when you debug, Visual Studio runs <yourapp>.vshost.exe and not your application. The .vshost.exe file doesn't use your icon.

Ultimately, what you have done is correct.

  1. Go to the Project properties
  2. under Application tab change the default icon to your own
  3. Build the project
  4. Locate the .exe file in your favorite file explorer.

There, the icon should look fine. If you run it by clicking that .exe the icon should be correct in the application as well.

How to insert a data table into SQL Server database table?

    //best way to deal with this is sqlbulkcopy 
    //but if you dont like it you can do it like this
    //read current sql table in an adapter
    //add rows of datatable , I have mentioned a simple way of it
    //and finally updating changes

    Dim cnn As New SqlConnection("connection string")        
    cnn.Open()
    Dim cmd As New SqlCommand("select * from  sql_server_table", cnn)
    Dim da As New SqlDataAdapter(cmd)       
    Dim ds As New DataSet()
    da.Fill(ds, "sql_server_table")
    Dim cb As New SqlCommandBuilder(da)        

    //for each datatable row
    ds.Tables("sql_server_table").Rows.Add(COl1, COl2)

    da.Update(ds, "sql_server_table")

PHP/Apache: PHP Fatal error: Call to undefined function mysql_connect()

I had this same problem and had to refer to the php manual which told me the mysql and mysqli extensions require libmysql.dll to load. I searched for it under C:\windows\system32 (windows 7) and could not find, so I downloaded it here and placed it in my C:\windows\system32. I restarted Apache and everything worked fine. Took me 3 days to figure out, hope it helps.

Why use 'git rm' to remove a file instead of 'rm'?

Removing files using rm is not a problem per se, but if you then want to commit that the file was removed, you will have to do a git rm anyway, so you might as well do it that way right off the bat.

Also, depending on your shell, doing git rm after having deleted the file, you will not get tab-completion so you'll have to spell out the path yourself, whereas if you git rm while the file still exists, tab completion will work as normal.

Signing a Windows EXE file

You can get a free cheap code signing certificate from Certum if you're doing open source development.

I've been using their certificate for over a year, and it does get rid of the unknown publisher message from Windows.

As far as signing code I use signtool.exe from a script like this:

signtool.exe sign /t http://timestamp.verisign.com/scripts/timstamp.dll /f "MyCert.pfx" /p MyPassword /d SignedFile.exe SignedFile.exe

How can I convert radians to degrees with Python?

Python convert radians to degrees or degrees to radians:

What are Radians and what problem does it solve?:

Radians and degrees are two separate units of measure that help people express and communicate precise changes in direction. Wikipedia has some great intuition with their infographics on how one Radian is defined relative to degrees:

https://en.wikipedia.org/wiki/Radian

Conversion from radians to degrees

Python examples using libraries calculating degrees from radians:

>>> import math
>>> math.degrees(0)                       #0 radians == 0 degrees
0.0
>>> math.degrees(math.pi/2)               #pi/2 radians is 90 degrees
90.0
>>> math.degrees(math.pi)                 #pi radians is 180 degrees
180.0      
>>> math.degrees(math.pi+(math.pi/2))     #pi+pi/2 radians is 270 degrees
270.0 
>>> math.degrees(math.pi+math.pi)         #2*pi radians is 360 degrees
360.0      

Python examples using libraries calculating radians from degrees:

>>> import math
>>> math.radians(0)           #0 degrees == 0 radians
0.0
>>> math.radians(90)          #90 degrees is pi/2 radians
1.5707963267948966
>>> math.radians(180)         #180 degrees is pi radians
3.141592653589793
>>> math.radians(270)         #270 degrees is pi+(pi/2) radians
4.71238898038469
>>> math.radians(360)         #360 degrees is 2*pi radians
6.283185307179586

Source: https://docs.python.org/3/library/math.html#angular-conversion

The mathematical notation:

Mathematical notation of degrees and radians

You can do degree/radian conversion without libraries:

If you roll your own degree/radian converter, you have to write your own code to handle edge cases.

Mistakes here are easy to make, and will hurt just like it hurt the developers of the 1999 mars orbiter who sunk $125m dollars crashing it into Mars because of non intuitive edge cases here.

Lets crash that orbiter and Roll our own Radians to Degrees:

Invalid radians as input return garbage output.

>>> 0 * 180.0 / math.pi                         #0 radians is 0 degrees
0.0
>>> (math.pi/2) * 180.0 / math.pi               #pi/2 radians is 90 degrees
90.0
>>> (math.pi) * 180.0 / math.pi                 #pi radians is 180 degrees
180.0
>>> (math.pi+(math.pi/2)) * 180.0 / math.pi     #pi+(pi/2) radians is 270 degrees
270.0
>>> (2 * math.pi) * 180.0 / math.pi             #2*pi radians is 360 degrees
360.0

Degrees to radians:

>>> 0 * math.pi / 180.0              #0 degrees in radians
0.0
>>> 90 * math.pi / 180.0             #90 degrees in radians
1.5707963267948966
>>> 180 * math.pi / 180.0            #180 degrees in radians
3.141592653589793
>>> 270 * math.pi / 180.0            #270 degrees in radians
4.71238898038469
>>> 360 * math.pi / 180.0            #360 degrees in radians
6.283185307179586

Expressing multiple rotations with degrees and radians

Single rotation valid radian values are between 0 and 2*pi. Single rotation degree values are between 0 and 360. However if you want to express multiple rotations, valid radian and degree values are between 0 and infinity.

>>> import math
>>> math.radians(360)                 #one complete rotation
6.283185307179586
>>> math.radians(360+360)             #two rotations
12.566370614359172
>>> math.degrees(12.566370614359172)  #math.degrees and math.radians preserve the
720.0                                 #number of rotations

Collapsing multiple rotations:

You can collapse multiple degree/radian rotations into a single rotation by modding against the value of one rotation. For degrees you mod by 360, for radians you modulus by 2*pi.

>>> import math
>>> math.radians(720+90)        #2 whole rotations plus 90 is 14.14 radians
14.137166941154069
>>> math.radians((720+90)%360)  #14.1 radians brings you to 
1.5707963267948966              #the end point as 1.57 radians.

>>> math.degrees((2*math.pi)+(math.pi/2))            #one rotation plus a quarter 
450.0                                                #rotation is 450 degrees.
>>> math.degrees(((2*math.pi)+(math.pi/2))%(2*math.pi)) #one rotation plus a quarter
90.0                                                    #rotation brings you to 90.

Protip

Khan academy has some excellent content to solidify intuition around trigonometry and angular mathematics: https://www.khanacademy.org/math/algebra2/trig-functions/intro-to-radians-alg2/v/introduction-to-radians

excel - if cell is not blank, then do IF statement

Your formula is wrong. You probably meant something like:

=IF(AND(NOT(ISBLANK(Q2));NOT(ISBLANK(R2)));IF(Q2<=R2;"1";"0");"")

Another equivalent:

=IF(NOT(OR(ISBLANK(Q2);ISBLANK(R2)));IF(Q2<=R2;"1";"0");"")

Or even shorter:

=IF(OR(ISBLANK(Q2);ISBLANK(R2));"";IF(Q2<=R2;"1";"0"))

OR EVEN SHORTER:

=IF(OR(ISBLANK(Q2);ISBLANK(R2));"";--(Q2<=R2))

How to check if an object implements an interface?

In general for AnInterface and anInstance of any class:

AnInterface.class.isAssignableFrom(anInstance.getClass());

C++ compiling on Windows and Linux: ifdef switch

This response isn't about macro war, but producing error if no matching platform is found.

#ifdef LINUX_KEY_WORD   
... // linux code goes here.  
#elif WINDOWS_KEY_WORD    
... // windows code goes here.  
#else     
#error Platform not supported
#endif

If #error is not supported, you may use static_assert (C++0x) keyword. Or you may implement custom STATIC_ASSERT, or just declare an array of size 0, or have switch that has duplicate cases. In short, produce error at compile time and not at runtime

Java Project: Failed to load ApplicationContext

I had the same problem, and I was using the following plugin for tests:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>2.9</version>
    <configuration>
        <useFile>true</useFile>
        <includes>
            <include>**/*Tests.java</include>
            <include>**/*Test.java</include>
        </includes>
        <excludes>
            <exclude>**/Abstract*.java</exclude>
        </excludes>
        <junitArtifactName>junit:junit</junitArtifactName>
        <parallel>methods</parallel>
        <threadCount>10</threadCount>
    </configuration>
</plugin>

The test were running fine in the IDE (eclipse sts), but failed when using command mvn test.

After a lot of trial and error, I figured the solution was to remove parallel testing, the following two lines from the plugin configuration above:

    <parallel>methods</parallel>
    <threadCount>10</threadCount>

Hope that this helps someone out!

Safely override C++ virtual functions

I would suggest a slight change in your logic. It may or may not work, depending on what you need to accomplish.

handle_event() can still do the "boring default code" but instead of being virtual, at the point where you want it to do the "new exciting code" have the base class call an abstract method (i.e. must-be-overridden) method that will be supplied by your descendant class.

EDIT: And if you later decide that some of your descendant classes do not need to provide "new exciting code" then you can change the abstract to virtual and supply an empty base class implementation of that "inserted" functionality.

Create a File object in memory from a string in Java

The File class represents the "idea" of a file, not an actual handle to use for I/O. This is why the File class has a .exists() method, to tell you if the file exists or not. (How can you have a File object that doesn't exist?)

By contrast, constructing a new FileInputStream(new File("/my/file")) gives you an actual stream to read bytes from.

How to set the range of y-axis for a seaborn boxplot?

It is standard matplotlib.pyplot:

...
import matplotlib.pyplot as plt
plt.ylim(10, 40)

Or simpler, as mwaskom comments below:

ax.set(ylim=(10, 40))

enter image description here

How to combine multiple inline style objects?

For ones that looking this solution in React, If you want to use the spread operator inside style, you should use: babel-plugin-transform-object-rest-spread.

Install it by npm module and configure your .babelrc as such:

{
  "presets": ["env", "react"],
  "plugins": ["transform-object-rest-spread"]
}

Then you can use like...

const sizing = { width: 200, height: 200 }
 <div
   className="dragon-avatar-image-background"
   style={{ backgroundColor: blue, ...sizing }}
  />

More info: https://babeljs.io/docs/en/babel-plugin-transform-object-rest-spread/

How to maintain a Unique List in Java?

You may want to use one of the implementing class of java.util.Set<E> Interface e.g. java.util.HashSet<String> collection class.

A collection that contains no duplicate elements. More formally, sets contain no pair of elements e1 and e2 such that e1.equals(e2), and at most one null element. As implied by its name, this interface models the mathematical set abstraction.

Laravel Eloquent: Ordering results of all()

In addition, just to buttress the former answers, it could be sorted as well either in descending desc or ascending asc orders by adding either as the second parameter.

$results = Project::orderBy('created_at', 'desc')->get();

SyntaxError: non-default argument follows default argument

You can't have a non-keyword argument after a keyword argument.

Make sure you re-arrange your function arguments like so:

def a(len1,til,hgt=len1,col=0):
    system('mode con cols='+len1,'lines='+hgt)
    system('title',til)
    system('color',col)

a(64,"hi",25,"0b")

Safe navigation operator (?.) or (!.) and null property paths

! is non-null assertion operator (post-fix expression) - it just saying to type checker that you're sure that a is not null or undefined.

the operation a! produces a value of the type of a with null and undefined excluded


Optional chaining finally made it to typescript (3.7)

The optional chaining operator ?. permits reading the value of a property located deep within a chain of connected objects without having to expressly validate that each reference in the chain is valid. The ?. operator functions similarly to the . chaining operator, except that instead of causing an error if a reference is nullish (null or undefined), the expression short-circuits with a return value of undefined. When used with function calls, it returns undefined if the given function does not exist.

Syntax:

obj?.prop // Accessing object's property
obj?.[expr] // Optional chaining with expressions
arr?.[index] // Array item access with optional chaining
func?.(args) // Optional chaining with function calls

Pay attention:

Optional chaining is not valid on the left-hand side of an assignment

const object = {};
object?.property = 1; // Uncaught SyntaxError: Invalid left-hand side in assignment

How to check if a string is a number?

Forget about ASCII code checks, use isdigit or isnumber (see man isnumber). The first function checks whether the character is 0–9, the second one also accepts various other number characters depending on the current locale.

There may even be better functions to do the check – the important lesson is that this is a bit more complex than it looks, because the precise definition of a “number string” depends on the particular locale and the string encoding.

XPath: select text node

your xpath should work . i have tested your xpath and mine in both MarkLogic and Zorba Xquery/ Xpath implementation.

Both should work.

/node/child::text()[1] - should return Text1
/node/child::text()[2] - should return text2


/node/text()[1] - should return Text1
/node/text()[2] - should return text2

Array of PHP Objects

The best place to find answers to general (and somewhat easy questions) such as this is to read up on PHP docs. Specifically in your case you can read more on objects. You can store stdObject and instantiated objects within an array. In fact, there is a process known as 'hydration' which populates the member variables of an object with values from a database row, then the object is stored in an array (possibly with other objects) and returned to the calling code for access.

-- Edit --

class Car
{
    public $color;
    public $type;
}

$myCar = new Car();
$myCar->color = 'red';
$myCar->type = 'sedan';

$yourCar = new Car();
$yourCar->color = 'blue';
$yourCar->type = 'suv';

$cars = array($myCar, $yourCar);

foreach ($cars as $car) {
    echo 'This car is a ' . $car->color . ' ' . $car->type . "\n";
}

Bootstrap 3 hidden-xs makes row narrower

.row {
    margin-right: 15px;
}

throw this in your CSS

When to use React setState callback

this.setState({
    name:'value' 
},() => {
    console.log(this.state.name);
});

How to update TypeScript to latest version with npm?

For npm: you can run:

npm update -g typescript

By default, it will install latest version.

For yarn, you can run:

yarn upgrade typescript

Or you can remove the orginal version, run yarn global remove typescript, and then execute yarn global add typescript, by default it will also install the latest version of typescript.

more details, you can read yarn docs.

no operator "<<" matches these operands

You're not including the standard <string> header.

You got [un]lucky that some of its pertinent definitions were accidentally made available by the other standard headers that you did include ... but operator<< was not.

PNG transparency issue in IE8

I know this thread has been dead some time, but here is another answer to the old ie8 png background issue.

You can do it in CSS by using IE's proprietary filtering system like this as well:

filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled='true',sizingMethod='scale',src='pathToYourPNG');

DEMO

you will need to use a blank.gif for the 'first' image in your background declaration. This is simply to confuse ie8 and prevent it from using both the filter and the background you have set, and only use the filter. Other browsers support multiple background images and will understand the background declaration and not understand the filter, hence using the background only.

You may also need to play with the sizingMethod in the filter to get it to work the way you want.

Spring Bean Scopes

In Spring, bean scope is used to decide which type of bean instance should be returned from Spring container back to the caller.

5 types of bean scopes are supported :

  1. Singleton : It returns a single bean instance per Spring IoC container.This single instance is stored in a cache of such singleton beans, and all subsequent requests and references for that named bean return the cached object.If no bean scope is specified in bean configuration file, default to singleton. enter image description here

  2. Prototype : It returns a new bean instance each time when requested. It does not store any cache version like singleton. enter image description here

  3. Request : It returns a single bean instance per HTTP request.

    enter image description here

  4. Session : It returns a single bean instance per HTTP session (User level session).

  5. GlobalSession : It returns a single bean instance per global HTTP session. It is only valid in the context of a web-aware Spring ApplicationContext (Application level session).

In most cases, you may only deal with the Spring’s core scope – singleton and prototype, and the default scope is singleton.

Angular File Upload

First, you need to set up HttpClient in your Angular project.

Open the src/app/app.module.ts file, import HttpClientModule and add it to the imports array of the module as follows:

import { BrowserModule } from '@angular/platform-browser';  
import { NgModule } from '@angular/core';
import { AppRoutingModule } from './app-routing.module';  
import { AppComponent } from './app.component';  
import { HttpClientModule } from '@angular/common/http';

@NgModule({  
  declarations: [  
    AppComponent,  
  ],  
  imports: [  
    BrowserModule,  
    AppRoutingModule,  
    HttpClientModule  
  ],  
  providers: [],  
  bootstrap: [AppComponent]  
})  
export class AppModule { }

Next, generate a component:

$ ng generate component home

Next, generate an upload service:

$ ng generate service upload

Next, open the src/app/upload.service.ts file as follows:

import { HttpClient, HttpEvent, HttpErrorResponse, HttpEventType } from  '@angular/common/http';  
import { map } from  'rxjs/operators';

@Injectable({  
  providedIn: 'root'  
})  
export class UploadService { 
    SERVER_URL: string = "https://file.io/";  
    constructor(private httpClient: HttpClient) { }
    public upload(formData) {

      return this.httpClient.post<any>(this.SERVER_URL, formData, {  
         reportProgress: true,  
         observe: 'events'  
      });  
   }
}

Next, open the src/app/home/home.component.ts file, and start by adding the following imports:

import { Component, OnInit, ViewChild, ElementRef  } from '@angular/core';
import { HttpEventType, HttpErrorResponse } from '@angular/common/http';
import { of } from 'rxjs';  
import { catchError, map } from 'rxjs/operators';  
import { UploadService } from  '../upload.service';

Next, define the fileUpload and files variables and inject UploadService as follows:

@Component({  
  selector: 'app-home',  
  templateUrl: './home.component.html',  
  styleUrls: ['./home.component.css']  
})  
export class HomeComponent implements OnInit {
    @ViewChild("fileUpload", {static: false}) fileUpload: ElementRef;files  = [];  
    constructor(private uploadService: UploadService) { }

Next, define the uploadFile() method:

uploadFile(file) {  
    const formData = new FormData();  
    formData.append('file', file.data);  
    file.inProgress = true;  
    this.uploadService.upload(formData).pipe(  
      map(event => {  
        switch (event.type) {  
          case HttpEventType.UploadProgress:  
            file.progress = Math.round(event.loaded * 100 / event.total);  
            break;  
          case HttpEventType.Response:  
            return event;  
        }  
      }),  
      catchError((error: HttpErrorResponse) => {  
        file.inProgress = false;  
        return of(`${file.data.name} upload failed.`);  
      })).subscribe((event: any) => {  
        if (typeof (event) === 'object') {  
          console.log(event.body);  
        }  
      });  
  }

Next, define the uploadFiles() method which can be used to upload multiple image files:

private uploadFiles() {  
    this.fileUpload.nativeElement.value = '';  
    this.files.forEach(file => {  
      this.uploadFile(file);  
    });  
}

Next, define the onClick() method:

onClick() {  
    const fileUpload = this.fileUpload.nativeElement;fileUpload.onchange = () => {  
    for (let index = 0; index < fileUpload.files.length; index++)  
    {  
     const file = fileUpload.files[index];  
     this.files.push({ data: file, inProgress: false, progress: 0});  
    }  
      this.uploadFiles();  
    };  
    fileUpload.click();  
}

Next, we need to create the HTML template of our image upload UI. Open the src/app/home/home.component.html file and add the following content:

<div [ngStyle]="{'text-align':center; 'margin-top': 100px;}">
   <button mat-button color="primary" (click)="fileUpload.click()">choose file</button>  
   <button mat-button color="warn" (click)="onClick()">Upload</button>  
   <input [hidden]="true" type="file" #fileUpload id="fileUpload" name="fileUpload" multiple="multiple" accept="image/*" />
</div>

Check out this tutorial and this post

Perform Button click event when user press Enter key in Textbox

Put your form inside an asp.net panel control and set its defaultButton attribute with your button Id. See the code below:

  <asp:Panel ID="Panel1" runat="server" DefaultButton="Button1">
        <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
         <ContentTemplate>
            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Send" />
             </ContentTemplate>
          </asp:UpdatePanel>
    </asp:Panel>

Hope this will help you...

SQL Server - Case Statement

I am looking for a way to create a select without repeating the conditional query.

I'm assuming that you don't want to repeat Foo-stuff+bar. You could put your calculation into a derived table:

SELECT CASE WHEN a.TestValue > 2 THEN a.TestValue ELSE 'Fail' END 
FROM (SELECT (Foo-stuff+bar) AS TestValue FROM MyTable) AS a

A common table expression would work just as well:

WITH a AS (SELECT (Foo-stuff+bar) AS TestValue FROM MyTable)
SELECT CASE WHEN a.TestValue > 2 THEN a.TestValue ELSE 'Fail' END    
FROM a

Also, each part of your switch should return the same datatype, so you may have to cast one or more cases.

How to update cursor limit for ORA-01000: maximum open cursors exceed

RUn the following query to find if you are running spfile or not:

SELECT DECODE(value, NULL, 'PFILE', 'SPFILE') "Init File Type" 
       FROM sys.v_$parameter WHERE name = 'spfile';

If the result is "SPFILE", then use the following command:

alter system set open_cursors = 4000 scope=both; --4000 is the number of open cursor

if the result is "PFILE", then use the following command:

alter system set open_cursors = 1000 ;

You can read about SPFILE vs PFILE here,

http://www.orafaq.com/node/5

How to use sbt from behind proxy?

I found that starting IntelliJ IDEA from terminal let me connect and download over the internet. To start from terminal, type in:

$ idea