bundle install returns "Could not locate Gemfile"

I had this problem as well on an OSX machine. I discovered that rails was not installed... which surprised me as I thought OSX always came with Rails. To install rails

sudo gem install rails
to install jekyll I also needed sudo
sudo gem install jekyll bundler
cd ~/Sites
jekyll new <foldername>
cd <foldername> OR cd !$ (that is magic ;)
bundle install
bundle exec jekyll serve
Then in your browser just go to http://127.0.0.1:4000/ and it really should be running

how to set default main class in java?

Right-click the project node in the Projects window and choose Project Properties. then find run, there you can setup your main class,, **actually got it from netbeans default help

Where is android_sdk_root? and how do I set it.?

This is how I did it on macOS:

vim ~/.bash_profile  # macOS 10.14 Mojave and older
vim ~/.zshrc         # macOS 10.15 Catalina and newer (using zsh by default)

And added the following environment variables:

export ANDROID_HOME=/Users/{{your user}}/Library/Android/sdk
export ANDROID_SDK_ROOT=/Users/{{your user}}/Library/Android/sdk
export ANDROID_AVD_HOME=/Users/{{your user}}/.android/avd

Android path might be different, if so change it accordingly. At last, to refresh the terminal to apply changes:

source ~/.bash_profile  # macOS 10.14 Mojave and older
source ~/.zshrc         # macOS 10.15 Catalina and newer (using zsh by default)

How does one target IE7 and IE8 with valid CSS?

Explicitly Target IE versions without hacks using HTML and CSS

Use this approach if you don't want hacks in your CSS. Add a browser-unique class to the <html> element so you can select based on browser later.

Example

<!doctype html>
<!--[if IE]><![endif]-->
<!--[if lt IE 7 ]> <html lang="en" class="ie6">    <![endif]-->
<!--[if IE 7 ]>    <html lang="en" class="ie7">    <![endif]-->
<!--[if IE 8 ]>    <html lang="en" class="ie8">    <![endif]-->
<!--[if IE 9 ]>    <html lang="en" class="ie9">    <![endif]-->
<!--[if (gt IE 9)|!(IE)]><!--><html lang="en"><!--<![endif]-->
    <head></head>
    <body></body>
</html>

Then in your CSS you can very strictly access your target browser.

Example

.ie6 body { 
    border:1px solid red;
}
.ie7 body { 
    border:1px solid blue;
}

For more information check out http://html5boilerplate.com/

Target IE versions with CSS "Hacks"

More to your point, here are the hacks that let you target IE versions.

Use "\9" to target IE8 and below.
Use "*" to target IE7 and below.
Use "_" to target IE6.

Example:

body { 
border:1px solid red; /* standard */
border:1px solid blue\9; /* IE8 and below */
*border:1px solid orange; /* IE7 and below */
_border:1px solid blue; /* IE6 */
}

Update: Target IE10

IE10 does not recognize the conditional statements so you can use this to apply an "ie10" class to the <html> element

<!doctype html>
    <html lang="en">
    <!--[if !IE]><!--><script>if (/*@cc_on!@*/false) {document.documentElement.className+=' ie10';}</script><!--<![endif]-->
        <head></head>
        <body></body>
</html>

Python and pip, list all versions of a package that's available?

I came up with dead-simple bash script. Thanks to jq's author.

#!/bin/bash
set -e

PACKAGE_JSON_URL="https://pypi.org/pypi/${1}/json"

curl -L -s "$PACKAGE_JSON_URL" | jq  -r '.releases | keys | .[]' | sort -V

Update:

Add sorting by version number.

Add -L to follow redirects.

Random alpha-numeric string in JavaScript?

var randomString = function(length) {
  var str = '';
  var chars ='0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZabcdefghiklmnopqrstuvwxyz'.split(
      '');
  var charsLen = chars.length;
  if (!length) {
    length = ~~(Math.random() * charsLen);
  }
  for (var i = 0; i < length; i++) {
    str += chars[~~(Math.random() * charsLen)];
  }
  return str;
};

"did you run git update-server-info" error on a Github repository

How to pass IEnumerable list to controller in MVC including checkbox state?

Use a list instead and replace your foreach loop with a for loop:

@model IList<BlockedIPViewModel>

@using (Html.BeginForm()) 
{ 
    @Html.AntiForgeryToken()

    @for (var i = 0; i < Model.Count; i++) 
    {
        <tr>
            <td>
                @Html.HiddenFor(x => x[i].IP)           
                @Html.CheckBoxFor(x => x[i].Checked)
            </td>
            <td>
                @Html.DisplayFor(x => x[i].IP)
            </td>
        </tr>
    }
    <div>
        <input type="submit" value="Unblock IPs" />
    </div>
}

Alternatively you could use an editor template:

@model IEnumerable<BlockedIPViewModel>

@using (Html.BeginForm()) 
{ 
    @Html.AntiForgeryToken()
    @Html.EditorForModel()   
    <div>
        <input type="submit" value="Unblock IPs" />
    </div>
}

and then define the template ~/Views/Shared/EditorTemplates/BlockedIPViewModel.cshtml which will automatically be rendered for each element of the collection:

@model BlockedIPViewModel
<tr>
    <td>
        @Html.HiddenFor(x => x.IP)
        @Html.CheckBoxFor(x => x.Checked)
    </td>
    <td>
        @Html.DisplayFor(x => x.IP)
    </td>
</tr>

The reason you were getting null in your controller is because you didn't respect the naming convention for your input fields that the default model binder expects to successfully bind to a list. I invite you to read the following article.

Once you have read it, look at the generated HTML (and more specifically the names of the input fields) with my example and yours. Then compare and you will understand why yours doesn't work.

Why use multiple columns as primary keys (composite primary key)

You use a compound key (a key with more than one attribute) whenever you want to ensure the uniqueness of a combination of several attributes. A single attribute key would not achieve the same thing.

Angularjs simple file download causes router to redirect

If you need a directive more advanced, I recomend the solution that I implemnted, correctly tested on Internet Explorer 11, Chrome and FireFox.

I hope it, will be helpfull.

HTML :

<a href="#" class="btn btn-default" file-name="'fileName.extension'"  ng-click="getFile()" file-download="myBlobObject"><i class="fa fa-file-excel-o"></i></a>

DIRECTIVE :

directive('fileDownload',function(){
    return{
        restrict:'A',
        scope:{
            fileDownload:'=',
            fileName:'=',
        },

        link:function(scope,elem,atrs){


            scope.$watch('fileDownload',function(newValue, oldValue){

                if(newValue!=undefined && newValue!=null){
                    console.debug('Downloading a new file'); 
                    var isFirefox = typeof InstallTrigger !== 'undefined';
                    var isSafari = Object.prototype.toString.call(window.HTMLElement).indexOf('Constructor') > 0;
                    var isIE = /*@cc_on!@*/false || !!document.documentMode;
                    var isEdge = !isIE && !!window.StyleMedia;
                    var isChrome = !!window.chrome && !!window.chrome.webstore;
                    var isOpera = (!!window.opr && !!opr.addons) || !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
                    var isBlink = (isChrome || isOpera) && !!window.CSS;

                    if(isFirefox || isIE || isChrome){
                        if(isChrome){
                            console.log('Manage Google Chrome download');
                            var url = window.URL || window.webkitURL;
                            var fileURL = url.createObjectURL(scope.fileDownload);
                            var downloadLink = angular.element('<a></a>');//create a new  <a> tag element
                            downloadLink.attr('href',fileURL);
                            downloadLink.attr('download',scope.fileName);
                            downloadLink.attr('target','_self');
                            downloadLink[0].click();//call click function
                            url.revokeObjectURL(fileURL);//revoke the object from URL
                        }
                        if(isIE){
                            console.log('Manage IE download>10');
                            window.navigator.msSaveOrOpenBlob(scope.fileDownload,scope.fileName); 
                        }
                        if(isFirefox){
                            console.log('Manage Mozilla Firefox download');
                            var url = window.URL || window.webkitURL;
                            var fileURL = url.createObjectURL(scope.fileDownload);
                            var a=elem[0];//recover the <a> tag from directive
                            a.href=fileURL;
                            a.download=scope.fileName;
                            a.target='_self';
                            a.click();//we call click function
                        }


                    }else{
                        alert('SORRY YOUR BROWSER IS NOT COMPATIBLE');
                    }
                }
            });

        }
    }
})

IN CONTROLLER:

$scope.myBlobObject=undefined;
$scope.getFile=function(){
        console.log('download started, you can show a wating animation');
        serviceAsPromise.getStream({param1:'data1',param1:'data2', ...})
        .then(function(data){//is important that the data was returned as Aray Buffer
                console.log('Stream download complete, stop animation!');
                $scope.myBlobObject=new Blob([data],{ type:'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'});
        },function(fail){
                console.log('Download Error, stop animation and show error message');
                                    $scope.myBlobObject=[];
                                });
                            };

IN SERVICE:

function getStream(params){
                 console.log("RUNNING");
                 var deferred = $q.defer();

                 $http({
                     url:'../downloadURL/',
                     method:"PUT",//you can use also GET or POST
                     data:params,
                     headers:{'Content-type': 'application/json'},
                     responseType : 'arraybuffer',//THIS IS IMPORTANT
                    })
                    .success(function (data) {
                        console.debug("SUCCESS");
                        deferred.resolve(data);
                    }).error(function (data) {
                         console.error("ERROR");
                         deferred.reject(data);
                    });

                 return deferred.promise;
                };

BACKEND(on SPRING):

@RequestMapping(value = "/downloadURL/", method = RequestMethod.PUT)
public void downloadExcel(HttpServletResponse response,
        @RequestBody Map<String,String> spParams
        ) throws IOException {
        OutputStream outStream=null;
outStream = response.getOutputStream();//is important manage the exceptions here
ObjectThatWritesOnOutputStream myWriter= new ObjectThatWritesOnOutputStream();// note that this object doesn exist on JAVA,
ObjectThatWritesOnOutputStream.write(outStream);//you can configure more things here
outStream.flush();
return;
}

Removing elements by class name?

Brett - are you aware that getElementyByClassName support from IE 5.5 to 8 is not there according to quirksmode?. You would be better off following this pattern if you care about cross-browser compatibility:

Get container element by ID.
Get needed child elements by tag name.
Iterate over children, test for matching className property.
elements[i].parentNode.removeChild(elements[i]) like the other guys said.

Quick example:

var cells = document.getElementById("myTable").getElementsByTagName("td");
var len = cells.length;
for(var i = 0; i < len; i++) {
    if(cells[i].className.toLowerCase() == "column") {
        cells[i].parentNode.removeChild(cells[i]);
    }
}

Here's a quick demo.

EDIT: Here is the fixed version, specific to your markup:

var col_wrapper = document.getElementById("columns").getElementsByTagName("div");

var elementsToRemove = [];
for (var i = 0; i < col_wrapper.length; i++) {
    if (col_wrapper[i].className.toLowerCase() == "column") {
        elementsToRemove.push(col_wrapper[i]);
    }
}
for(var i = 0; i < elementsToRemove.length; i++) {
    elementsToRemove[i].parentNode.removeChild(elementsToRemove[i]);
}

The problem was my fault; when you remove an element from the resulting array of elements, the length changes, so one element gets skipped at each iteration. The solution is to store a reference to each element in a temporary array, then subsequently loop over those, removing each one from the DOM.

Try it here.

byte[] to hex string

With:

byte[] data = new byte[] { 0x01, 0x02, 0x03, 0x0D, 0x0E, 0x0F };
string hex = string.Empty;
data.ToList().ForEach(b => hex += b.ToString("x2"));
// use "X2" for uppercase hex letters
Console.WriteLine(hex);

Result: 0102030d0e0f

$(document).on("click"... not working?

This works:

<div id="start-element">Click Me</div>

$(document).on("click","#test-element",function() {
    alert("click");
});

$(document).on("click","#start-element",function() {
    $(this).attr("id", "test-element");
});

Here is the Fiddle

How to change XML Attribute

Mike; Everytime I need to modify an XML document I work it this way:

//Here is the variable with which you assign a new value to the attribute
string newValue = string.Empty;
XmlDocument xmlDoc = new XmlDocument();

xmlDoc.Load(xmlFile);

XmlNode node = xmlDoc.SelectSingleNode("Root/Node/Element");
node.Attributes[0].Value = newValue;

xmlDoc.Save(xmlFile);

//xmlFile is the path of your file to be modified

I hope you find it useful

How to use ArrayList's get() method

To put it nice and simply, get(int index) returns the element at the specified index.

So say we had an ArrayList of Strings:

List<String> names = new ArrayList<String>();
names.add("Arthur Dent");
names.add("Marvin");
names.add("Trillian");
names.add("Ford Prefect");

Which can be visualised as: Where 0, 1, 2, and 3 denote the indexes of the ArrayList.

Say we wanted to retrieve one of the names we would do the following: String name = names.get(1); Which returns the name at the index of 1.

So if we were to print out the name System.out.println(name); the output would be Marvin - Although he might not be too happy with us disturbing him.

Develop Android app using C#

You could use Mono for Android:

http://xamarin.com/monoforandroid

An alternative is dot42:

http://www.dot42.com/

dot42 provides a free community licence as well as a professional licence for $399.

How can I format decimal property to currency?

Try this;

  string.Format(new CultureInfo("en-SG", false), "{0:c0}", 123423.083234);

It will convert 123423.083234 to $1,23,423 format.

Java ArrayList for integers

you should not use Integer[] array inside the list as arraylist itself is a kind of array. Just leave the [] and it should work

Is it possible to iterate through JSONArray?

Not with an iterator.

For org.json.JSONArray, you can do:

for (int i = 0; i < arr.length(); i++) {
  arr.getJSONObject(i);
}

For javax.json.JsonArray, you can do:

for (int i = 0; i < arr.size(); i++) {
  arr.getJsonObject(i);
}

remote: repository not found fatal: not found

Please find below the working solution for Windows: It worked for me. 1 Open Control Panel from the Start menu. 2 Select User Accounts. 3 Select the "Credential Manager". 4 Click on "Manage Windows Credentials". 5 Delete any credentials related to Git or GitHub. 6 Once you deleted all then try to clone again.

remove item from stored array in angular 2

Sometimes, splice is not enough especially if your array is involved in a FILTER logic. So, first of all you could check if your element does exist to be absolute sure to remove that exact element:

if (array.find(x => x == element)) {
   array.splice(array.findIndex(x => x == element), 1);
}

How do you replace all the occurrences of a certain character in a string?

The problem is you're not doing anything with the result of replace. In Python strings are immutable so anything that manipulates a string returns a new string instead of modifying the original string.

line[8] = line[8].replace(letter, "")

Passing parameter to controller from route in laravel

You can add them like this

  Route::get('company/{name}', 'PublicareaController@companydetails');

Why aren't programs written in Assembly more often?

Assembly is not portable between different microprocessors.

How can I parse a JSON file with PHP?

Loop through the JSON with a foreach loop as key-value pairs. Do type-checking to determine if more looping needs to be done.

foreach($json_a as $key => $value) {
    echo $key;
    if (gettype($value) == "object") {
        foreach ($value as $key => $value) {
          # and so on
        }
    }
}

How to play only the audio of a Youtube video using HTML 5?

I agree with Tom van der Woerdt. You could use CSS to hide the video (visibility:hidden or overflow:hidden in a div wrapper constrained by height), but that may violate Youtube's policies. Additionally, how could you control the audio (pause, stop, volume, etc.)?

You could instead turn to resources such as http://www.houndbite.com/ to manage audio.

Illegal Escape Character "\"

I think ("\") may be causing the problem because \ is the escape character. change it to ("\\")

Spring: Why do we autowire the interface and not the implemented class?

How does spring know which polymorphic type to use.

As long as there is only a single implementation of the interface and that implementation is annotated with @Component with Spring's component scan enabled, Spring framework can find out the (interface, implementation) pair. If component scan is not enabled, then you have to define the bean explicitly in your application-config.xml (or equivalent spring configuration file).

Do I need @Qualifier or @Resource?

Once you have more than one implementation, then you need to qualify each of them and during auto-wiring, you would need to use the @Qualifier annotation to inject the right implementation, along with @Autowired annotation. If you are using @Resource (J2EE semantics), then you should specify the bean name using the name attribute of this annotation.

Why do we autowire the interface and not the implemented class?

Firstly, it is always a good practice to code to interfaces in general. Secondly, in case of spring, you can inject any implementation at runtime. A typical use case is to inject mock implementation during testing stage.

interface IA
{
  public void someFunction();
}


class B implements IA
{
  public void someFunction()
  {
    //busy code block
  }
  public void someBfunc()
  {
     //doing b things
  }
}


class C implements IA
{
  public void someFunction()
  {
    //busy code block
  }
  public void someCfunc()
  {
     //doing C things
  }
}

class MyRunner
{
     @Autowire
     @Qualifier("b") 
     IA worker;

     ....
     worker.someFunction();
}

Your bean configuration should look like this:

<bean id="b" class="B" />
<bean id="c" class="C" />
<bean id="runner" class="MyRunner" />

Alternatively, if you enabled component scan on the package where these are present, then you should qualify each class with @Component as follows:

interface IA
{
  public void someFunction();
}

@Component(value="b")
class B implements IA
{
  public void someFunction()
  {
    //busy code block
  }
  public void someBfunc()
  {
     //doing b things
  }
}


@Component(value="c")
class C implements IA
{
  public void someFunction()
  {
    //busy code block
  }
  public void someCfunc()
  {
     //doing C things
  }
}

@Component    
class MyRunner
{
     @Autowire
     @Qualifier("b") 
     IA worker;

     ....
     worker.someFunction();
}

Then worker in MyRunner will be injected with an instance of type B.

How can I delete using INNER JOIN with SQL Server?

It should be:

DELETE zpost 
FROM zpost 
INNER JOIN zcomment ON (zpost.zpostid = zcomment.zpostid)
WHERE zcomment.icomment = "first"

C compile error: Id returned 1 exit status

Just try " gcc filename.c -lm" while compiling the program ...it worked for me

Sqlite convert string to date

convert a string into date little issue think with indexing mmm 3,3 but works added a month on to the date string

SELECT substr('12Jan20',1,2) as dday,
date(substr('12Jan20',6,7) ||'00-' || case substr('12Jan20',3,3) when 'Jan' then '01'
when 'Feb' then '02'
when 'Mar' then '03'
when 'Apr' then '04'
when 'May' then '05' 
when 'Jun' then '06'
when 'Jul' then '07'
when 'Aug' then '08'
when 'Sep' then '09'
when 'Oct' then '10'
when 'Nov' then '11'
when 'Dec' then '12' end  || '-'||substr('12Jan20',1,2), '+1 month') as tt

Best way to compare two complex objects

Use IEquatable<T> Interface which has a method Equals.

How to create a drop-down list?

enter image description here

Here is the code for it.

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<Spinner
    android:id="@+id/static_spinner"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="20dp"
    android:layout_marginTop="20dp" />

<Spinner
    android:id="@+id/dynamic_spinner"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" />

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Ahotbrew.com - Dropdown</string> 
<string-array name="brew_array">
    <item>Cappuccino</item>
    <item>Espresso</item>
    <item>Mocha</item>
    <item>Caffè Americano</item>
    <item>Cafe Zorro</item>
</string-array>

MainActivity

Spinner staticSpinner = (Spinner) findViewById(R.id.static_spinner);

    // Create an ArrayAdapter using the string array and a default spinner
    ArrayAdapter<CharSequence> staticAdapter = ArrayAdapter
            .createFromResource(this, R.array.brew_array,
                    android.R.layout.simple_spinner_item);

    // Specify the layout to use when the list of choices appears
    staticAdapter
            .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    // Apply the adapter to the spinner
    staticSpinner.setAdapter(staticAdapter);

    Spinner dynamicSpinner = (Spinner) findViewById(R.id.dynamic_spinner);

    String[] items = new String[] { "Chai Latte", "Green Tea", "Black Tea" };

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, items);

    dynamicSpinner.setAdapter(adapter);

    dynamicSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view,
                int position, long id) {
            Log.v("item", (String) parent.getItemAtPosition(position));
        }

        @Override
        public void onNothingSelected(AdapterView<?> parent) {
            // TODO Auto-generated method stub
        }
    });

This example is from http://www.ahotbrew.com/android-dropdown-spinner-example/

jQuery won't parse my JSON from AJAX query

JSON strings are wrapped in double quotes; single quotes are not a valid substitute.

{"who": "Hello World"}

is valid but this is not...

{'who': 'Hello World'}

Whilst not the OP's issue, thought it worth noting for others who land here.

Move entire line up and down in Vim

Move a line up: ddkP

Move a line down: ddp

How can I convert a string with dot and comma into a float in Python

If you don't know the locale and you want to parse any kind of number, use this parseNumber(text) function. It is not perfect but take into account most cases :

>>> parseNumber("a 125,00 €")
125
>>> parseNumber("100.000,000")
100000
>>> parseNumber("100 000,000")
100000
>>> parseNumber("100,000,000")
100000000
>>> parseNumber("100 000 000")
100000000
>>> parseNumber("100.001 001")
100.001
>>> parseNumber("$.3")
0.3
>>> parseNumber(".003")
0.003
>>> parseNumber(".003 55")
0.003
>>> parseNumber("3 005")
3005
>>> parseNumber("1.190,00 €")
1190
>>> parseNumber("1190,00 €")
1190
>>> parseNumber("1,190.00 €")
1190
>>> parseNumber("$1190.00")
1190
>>> parseNumber("$1 190.99")
1190.99
>>> parseNumber("1 000 000.3")
1000000.3
>>> parseNumber("1 0002,1.2")
10002.1
>>> parseNumber("")

>>> parseNumber(None)

>>> parseNumber(1)
1
>>> parseNumber(1.1)
1.1
>>> parseNumber("rrr1,.2o")
1
>>> parseNumber("rrr ,.o")

>>> parseNumber("rrr1rrr")
1

Zero-pad digits in string

There's also str_pad

<?php
$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input, 6 , "___");               // produces "Alien_"
?>

Static Block in Java

A static block executes once in the life cycle of any program, another property of static block is that it executes before the main method.

What is the newline character in the C language: \r or \n?

What is the newline character in the C language: \r or \n?

The new-line may be thought of a some char and it has the value of '\n'. C11 5.2.1

This C new-line comes up in 3 places: C source code, as a single char and as an end-of-line in file I/O when in text mode.

Many compilers will treat source text as ASCII. In that case, codes 10, sometimes 13, and sometimes paired 13,10 as new-line for source code. Had the source code been in another character set, different codes may be used. This new-line typically marks the end of a line of source code (actually a bit more complicated here), // comment, and # directives.
In source code, the 2 characters \ and n represent the char new-line as \n. If ASCII is used, this char would have the value of 10.
In file I/O, in text mode, upon reading the bytes of the input file (and stdin), depending on the environment, when bytes with the value(s) of 10 (Unix), 13,10, (*1) (Windows), 13 (Old Mac??) and other variations are translated in to a '\n'. Upon writing a file (or stdout), the reverse translation occurs.
Note: File I/O in binary mode makes no translation.

The '\r' in source code is the carriage return char.

(*1) A lone 13 and/or 10 may also translate into \n.

JQuery get all elements by class name

With the code in the question, you're only dealing interacting with the first of the four entries returned by that selector.

Code below as a fiddle: https://jsfiddle.net/c4nhpqgb/

I want to be overly clear that you have four items that matched that selector, so you need to deal with each explicitly. Using eq() is a little more explicit making this point than the answers using map, though map or each is what you'd probably use "in real life" (jquery docs for eq here).

<html>
    <head>
        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js" ></script>
    </head>

    <body>
        <div class="mbox">Block One</div>
        <div class="mbox">Block Two</div>
        <div class="mbox">Block Three</div>
        <div class="mbox">Block Four</div>

        <div id="outige"></div>
        <script>
            // using the $ prefix to use the "jQuery wrapped var" convention
            var i, $mvar = $('.mbox');

            // convenience method to display unprocessed html on the same page
            function logit( string )
            {
                var text = document.createTextNode( string );
                $('#outige').append(text);
                $('#outige').append("<br>");
            }

            logit($mvar.length);

            for (i=0; i<$mvar.length; i++)    {
                logit($mvar.eq(i).html());
            }
        </script>
    </body>

</html>

Output from logit calls (after the initial four div's display):

4
Block One
Block Two
Block Three
Block Four

Why do I get TypeError: can't multiply sequence by non-int of type 'float'?

You can't multiply string and float.instead of you try as below.it works fine

totalAmount = salesAmount * float(salesTax)

Return single column from a multi-dimensional array

Although this question is related to string conversion, I stumbled upon this while wanting an easy way to write arrays to my log files. If you just want the info, and don't care about the exact cleanliness of a string you might consider:

json_encode($array)

Difference between null and empty string

Null means nothing. Its just a literal. Null is the value of reference variable. But empty string is blank.It gives the length=0. Empty string is a blank value,means the string does not have any thing.

How to turn a String into a JavaScript function call?

JavaScript has an eval function that evaluates a string and executes it as code:

eval(settings.functionName + '(' + t.parentNode.id + ')');

How to verify an XPath expression in Chrome Developers tool or Firefox's Firebug?

Chrome

This can be achieved by three different approaches (see my blog article here for more details):

Search in Elements panel like below
Execute $x() and $$() in Console panel, as shown in Lawrence's answer
Third party extensions (not really necessary in most of the cases, could be an overkill)

Here is how you search XPath in Elements panel:

Press F12 to open Chrome Developer Tool
In "Elements" panel, press Ctrl+F
In the search box, type in XPath or CSS Selector, if elements are found, they will be highlighted in yellow.

enter image description here

Firefox (since version 75)

Since FF 75 it's possible to use raw xpath query without evaluation xpath expressions, see documentation for more info.

Firefox (prior version 75)

Either select "Web Console" from the Web Developer submenu in the Firefox Menu (or Tools menu if you display the menu bar or are on Mac OS X)
or press the Ctrl+Shift+K (Command+Option+K on OS X) keyboard shortcut.
In the command line at the bottom use the following:
- $(): Returns the first element that matches. Equivalent to document.querySelector() or calls the $ function in the page, if it exists.
- $$(): Returns an array of DOM nodes that match. This is like for document.querySelectorAll(), but returns an array instead of a NodeList.
- $x(): Evaluates an XPath expression and returns an array of matching nodes.

Firefox (prior version 49)

Install Firebug
Install Firepath
Press F12 to open Firebug
Switch to FirePath panel
In dropdown, select XPathor CSS
Type in to locate

enter image description here

Java format yyyy-MM-dd'T'HH:mm:ss.SSSz to yyyy-mm-dd HH:mm:ss

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss");
SimpleDateFormat output = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date d = sdf.parse(time);
String formattedTime = output.format(d);

This works. You have to use two SimpleDateFormats, one for input and one for output, but it will give you just what you are wanting.

Excel plot time series frequency with continuous xaxis

You can get good Time Series graphs in Excel, the way you want, but you have to work with a few quirks.

Be sure to select "Scatter Graph" (with a line option). This is needed if you have non-uniform time stamps, and will scale the X-axis accordingly.
In your data, you need to add a column with the mid-point. Here's what I did with your sample data. (This trick ensures that the data gets plotted at the mid-point, like you desire.)
You can format the x-axis options with this menu. (Chart->Design->Layout)
Select "Axes" and go to Primary Horizontal Axis, and then select "More Primary Horizontal Axis Options"
Set up the options you wish. (Fix the starting and ending points.)
And you will get a graph such as the one below.

You can then tweak many of the options, label the axes better etc, but this should get you started.

Hope this helps you move forward.

What is the difference between Python and IPython?

Even after viewing this thread, I had thought that ipython was a synonym for the python shell, in other words that typing python at the command line put one into ipython mode.

It is in fact, as referenced above, a very cool interactive shell (command line program) that can be installed from iPython.org or simply by running

pip install ipython

or the more extensive:

pip install ipython[notebook]

from the command line.

In PowerShell, how do I define a function in a file and call it from the PowerShell commandline?

If your file has only one main function that you want to call/expose, then you can also just start the file with:

Param($Param1)

You can then call it e.g. as follows:

.\MyFunctions.ps1 -Param1 'value1'

This makes it much more convenient if you want to easily call just that function without having to import the function.

Extract Data from PDF and Add to Worksheet

Since I do not prefer to rely on external libraries and/or other programs, I have extended your solution so that it works. The actual change here is using the GetFromClipboard function instead of Paste which is mainly used to paste a range of cells. Of course, the downside is that the user must not change focus or intervene during the whole process.

Dim pathPDF As String, textPDF As String
Dim openPDF As Object
Dim objPDF As MsForms.DataObject

pathPDF = "C:\some\path\data.pdf"
Set openPDF = CreateObject("Shell.Application")
openPDF.Open (pathPDF)
'TIME TO WAIT BEFORE/AFTER COPY AND PASTE SENDKEYS
Application.Wait Now + TimeValue("00:00:2")
SendKeys "^a"
Application.Wait Now + TimeValue("00:00:2")
SendKeys "^c"
Application.Wait Now + TimeValue("00:00:1")

AppActivate ActiveWorkbook.Windows(1).Caption
objPDF.GetFromClipboard
textPDF = objPDF.GetText(1)
MsgBox textPDF

If you're interested see my project in github.

Questions every good Java/Java EE Developer should be able to answer?

Can an interface extend multiple interfaces?

Most people answer "no", because they know java doesn't have multiple inheritance. But an interface can still extend multiple interfaces (but a class can't extend multiple classes). This doesn't lead to the diamond problem.

If the answer is "no", the interviewer should ask "why would it be forbidden?". Then you start thinking about it and you should realize that there is not problem with it.

So you learned something (by yourself) in the interview and you showed the interviewer that you are able to reason about classes, objects, inheritance, polymorphism, etc. It's actually much better than a candidate who knows the answer by heart but doesn't understand why

error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘attribute’ before ‘{’ token

Error happens in your function declarations,look the following sentence!You need a semicolon!

AST_NODE* Statement(AST_NODE* node)

"Char cannot be dereferenced" error

I guess ch is a declared as char. Since char is a primitive data type and not and object, you can't call any methof from it. You should use Character.isLetter(ch).

WPF Databinding: How do I access the "parent" data context?

You could try something like this:

...Binding="{Binding RelativeSource={RelativeSource FindAncestor, 
AncestorType={x:Type Window}}, Path=DataContext.AllowItemCommand}" ...

How to open existing project in Eclipse

File > Import > General > Existing Projects into workspace. Select the root folder that has your project(s). It lists all the projects available in the selected folder. Select the ones you would like to import and click Finish. This should work just fine.

Properly Handling Errors in VBA (Excel)

I keep things simple:
At the module level I define two variables and set one to the name of the module itself.

    Private Const ThisModuleName            As String = "mod_Custom_Functions"
    Public sLocalErrorMsg                   As String

Within each Sub/Function of the module I define a local variable

    Dim ThisRoutineName                     As String

I set ThisRoutineName to the name of the sub or function

' Housekeeping
    On Error Goto ERR_RTN
    ThisRoutineName = "CopyWorksheet"

I then send all errors to an ERR_RTN: when they occur, but I first set the sLocalErrorMsg to define what the error actually is and provide some debugging info.

    If Len(Trim(FromWorksheetName)) < 1 Then
        sLocalErrorMsg = "Parameter 'FromWorksheetName' Is Missing."
        GoTo ERR_RTN
    End If

At the bottom of each sub/function, I direct the logic flow as follows

    '
    ' The "normal" logic goes here for what the routine does
    '
    GoTo EXIT_RTN

    ERR_RTN:

        On Error Resume Next

    ' Call error handler if we went this far.
        ErrorHandler ThisModuleName, ThisRoutineName, sLocalErrorMsg, Err.Description, Err.Number, False

    EXIT_RTN:

        On Error Resume Next
     '
     ' Some closing logic
     '
    End If

I then have a seperate module I put in all projects called "mod_Error_Handler".

    '
    '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
    ' Subroutine Name:     ErrorHandler                                                     '
    '                                                                                       '
    ' Description:                                                                          '
    '   This module will handle the common error alerts.                                    '
    '                                                                                       '
    ' Inputs:                                                                               '
    '   ModuleName                String    'The name of the module error is in.            '
    '   RoutineName               String    'The name of the routine error in in.           '
    '   LocalErrorMsg             String    'A local message to assist with troubleshooting.'
    '   ERRDescription            String    'The Windows Error Description.                 '
    '   ERRCode                   Long      'The Windows Error Code.                        '
    '   Terminate                 Boolean   'End program if error encountered?              '
    '                                                                                       '
    ' Revision History:                                                                     '
    ' Date (YYYYMMDD) Author                Change                                          '
    ' =============== ===================== =============================================== '
    ' 20140529        XXXXX X. XXXXX        Original                                        '
    '                                                                                       '
    '''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
    '
    Public Sub ErrorHandler(ModuleName As String, RoutineName As String, LocalErrorMsg As String, ERRDescription As String, ERRCode As Long, Terminate As Boolean)
        Dim sBuildErrorMsg                 As String

    ' Build Error Message To Display
        sBuildErrorMsg = "Error Information:" & vbCrLf & vbCrLf

        If Len(Trim(ModuleName)) < 1 Then
            ModuleName = "Unknown"
        End If

        If Len(Trim(RoutineName)) < 1 Then
           RoutineName = "Unknown"
        End If

        sBuildErrorMsg = sBuildErrorMsg & "Module Name:        " & ModuleName & vbCrLf & vbCrLf
        sBuildErrorMsg = sBuildErrorMsg & "Routine Name:       " & RoutineName & vbCrLf & vbCrLf

        If Len(Trim(LocalErrorMsg)) > 0 Then
            sBuildErrorMsg = sBuildErrorMsg & "Local Error Msg:    " & LocalErrorMsg & vbCrLf & vbCrLf
        End If

        If Len(Trim(ERRDescription)) > 0 Then
            sBuildErrorMsg = sBuildErrorMsg & "Program Error Msg:  " & ERRDescription & vbCrLf & vbCrLf
            If IsNumeric(ERRCode) Then
                sBuildErrorMsg = sBuildErrorMsg & "Program Error Code: " & Trim(Str(ERRCode)) & vbCrLf & vbCrLf
            End If
        End If

        MsgBox sBuildErrorMsg, vbOKOnly + vbExclamation, "Error Detected!"

        If Terminate Then
            End
        End If

    End Sub

The end result is a pop-up error message teling me in what module, what soubroutine, and what the error message specifically was. In addition, it also will insert the Windows error message and code.

Exception thrown inside catch block - will it be caught again?

If you want to throw an exception from the catch block you must inform your method/class/etc. that it needs to throw said exception. Like so:

public void doStuff() throws MyException {
    try {
        //Stuff
    } catch(StuffException e) {
        throw new MyException();
    }
}

And now your compiler will not yell at you :)

How to close activity and go back to previous activity in android

it may be possible you are calling finish(); in the click button event so the main activity is closed just after you clicking the button and when you are coming back from next activity the application is exit because main activity is already closed and there is no active activity.

installing cPickle with python 3.5

cPickle comes with the standard library… in python 2.x. You are on python 3.x, so if you want cPickle, you can do this:

>>> import _pickle as cPickle

However, in 3.x, it's easier just to use pickle.

No need to install anything. If something requires cPickle in python 3.x, then that's probably a bug.

how to access downloads folder in android?

If you are using Marshmallow, you have to either:

Request permissions at runtime (the user will get to allow or deny the request) or:
The user must go into Settings -> Apps -> {Your App} -> Permissions and grant storage access.

This is because in Marshmallow, Google completely revamped how permissions work.

List all files and directories in a directory + subdirectories

With this you can just run them and chosse the sub folder when console run

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using data.Patcher; // The patcher XML
namespace PatchBuilder
{
class Program
{
    static void Main(string[] args)
    {
        string patchDir;
        if (args.Length == 0)
        {
            Console.WriteLine("Give the patch directory in argument");
            patchDir = Console.ReadLine();
        }
        else
        {
            patchDir = args[0];
        }

        if (File.Exists(Path.Combine(patchDir, "patch.xml")))
            File.Delete(Path.Combine(patchDir, "patch.xml"));

        var files = Directory.EnumerateFiles(patchDir, "*", SearchOption.AllDirectories).OrderBy(p => p).ToList();

        foreach (var file in files.Where(file => file.StartsWith("patch\\Resources")).ToArray())
        {
            files.Remove(file);
            files.Add(file);
        }

        var tasks = new List<MetaFileEntry>();
        using (var md5Hasher = MD5.Create())
        {
            for (int i = 0; i < files.Count; i++)
            {
                var file = files[i];

                if ((File.GetAttributes(file) & FileAttributes.Hidden) != 0)
                    continue;

                var content = File.ReadAllBytes(file);
                var md5Hasher2 = MD5.Create();

                var task =
                    new MetaFileEntry
                    {
                        LocalURL = GetRelativePath(file, patchDir + "\\"),
                        RelativeURL = GetRelativePath(file, patchDir + "\\"),
                        FileMD5 = Convert.ToBase64String(md5Hasher2.ComputeHash(content)),
                        FileSize = content.Length,
                    };

                md5Hasher2.Dispose();

                var pathBytes = Encoding.UTF8.GetBytes(task.LocalURL.ToLower());
                md5Hasher.TransformBlock(pathBytes, 0, pathBytes.Length, pathBytes, 0);
                if (i == files.Count - 1)
                    md5Hasher.TransformFinalBlock(content, 0, content.Length);
                else
                    md5Hasher.TransformBlock(content, 0, content.Length, content, 0);

                tasks.Add(task);
                Console.WriteLine(@"Add " + task.RelativeURL);
            }

            var patch = new MetaFile
            {
                Tasks = tasks.ToArray(),
                FolderChecksum = BitConverter.ToString(md5Hasher.Hash).Replace("-", "").ToLower(),
            };


            //XmlUtils.Serialize(Path.Combine(patchDir, "patch.xml"), patch);
            Console.WriteLine(@"Created Patch in {0} !", Path.Combine(patchDir, "patch.xml"));
        }

        Console.Read();
    }

    static string GetRelativePath(string fullPath, string relativeTo)
    {
        var foldersSplitted = fullPath.Split(new[] { relativeTo.Replace("/", "\\").Replace("\\\\", "\\") }, StringSplitOptions.RemoveEmptyEntries); // cut the source path and the "rest" of the path

        return foldersSplitted.Length > 0 ? foldersSplitted.Last() : ""; // return the "rest"
    }
}
}

and this the patchar for XML export

using System.Xml.Serialization;

namespace data.Patcher
{
    public class MetaFile
    {

        [XmlArray("Tasks")]
        public MetaFileEntry[] Tasks
        {
            get;
            set;
        }

        [XmlAttribute("checksum")]
        public string FolderChecksum
        {
            get;
            set;
        }
    }
}

PHP MySQL Google Chart JSON - Complete Example

Some might encounter this error either locally or on the server:

syntax error var data = new google.visualization.DataTable(<?=$jsonTable?>);

This means that their environment does not support short tags the solution is to use this instead:

<?php echo $jsonTable; ?>

And everything should work fine!

javascript variable reference/alias

In JavaScript, primitive types such as integers and strings are passed by value whereas objects are passed by reference. So in order to achieve this you need to use an object:

// declare an object with property x
var obj = { x: 1 };
var aliasToObj = obj;
aliasToObj.x ++;
alert( obj.x ); // displays 2

How to get JavaScript caller function line number? How to get JavaScript caller source URL?

This is how I have done it, I have tested it in both Firefox and Chrome. This makes it possible to check the filename and line number of the place where the function is called from.

logFileAndLineNumber(new Error());

function logFileAndLineNumber(newErr)
{
   if(navigator.userAgent.indexOf("Firefox") != -1)
   {
      var originPath = newErr.stack.split('\n')[0].split("/");
      var fileNameAndLineNumber = originPath[originPath.length - 1].split(">")[0];
      console.log(fileNameAndLineNumber);
   }else if(navigator.userAgent.indexOf("Chrome") != -1)
   {
      var originFile = newErr.stack.split('\n')[1].split('/');
      var fileName = originFile[originFile.length - 1].split(':')[0];
      var lineNumber = originFile[originFile.length - 1].split(':')[1];
      console.log(fileName+" line "+lineNumber);
    }
}

Collections sort(List<T>,Comparator<? super T>) method example

To use Collections sort(List,Comparator) , you need to create a class that implements Comparator Interface, and code for the compare() in it, through Comparator Interface

You can do something like this:

class StudentComparator implements Comparator
{
    public int compare (Student s1 Student s2)
    {
        // code to compare 2 students
    }
}

To sort do this:

 Collections.sort(List,new StudentComparator())

Windows command to get service status?

Well i see "Nick Kavadias" telling this:

"according to this http://www.computerhope.com/nethlp.htm it should be NET START /LIST ..."

If you type in Windows XP this:

NET START /LIST

you will get an error, just type instead

NET START

The /LIST is only for Windows 2000... If you fully read such web you would see the /LIST is only on Windows 2000 section.

Hope this helps!!!

Remove the last character in a string in T-SQL?

To update the record by trimming the last N characters of a particular column:

UPDATE tablename SET columnName = LEFT(columnName , LEN(columnName )-N) where clause

CSS Change List Item Background Color with Class

Scenario: I have a navigation menu like this. Note: Link <a> is child of list item <li>. I wanted to change the background of the selected list item and remove the background color of unselected list item.

<nav>
        <ul>
            <li><a href="#">Intro</a></li>
            <li><a href="#">Size</a></li>
            <li><a href="#">Play</a></li>
            <li><a href="#">Food</a></li>
        </ul>
        <div class="clear"></div>

       </nav>

I tried to add a class .active into the list item using jQuery but it was not working

.active
{
    background-color: #480048;
}

$("nav li a").click(function () {
        $(this).parent().addClass("active");
        $(this).parent().siblings().removeClass("active");
    });

Solution: Basically, using .active class changing the background-color of list item does not work. So I changed the css class name from .active to "nav li.active a" so using the same javascript it will add the .active class into the selected list item. Now if the list item <li> has .active class then css will change the background color of the child of that list item <a>.

nav li.active a
{
    background-color: #480048;
}

Output a NULL cell value in Excel

I've been frustrated by this problem as well. Find/Replace can be helpful though, because if you don't put anything in the "replace" field it will replace with an -actual- NULL. So the steps would be something along the lines of:

1: Place some unique string in your formula in place of the NULL output (i like to use a password-like string)

2: Run your formula

3: Open Find/Replace, and fill in the unique string as the search value. Leave "replace with" blank

4: Replace All

Obviously, this has limitations. It only works when the context allows you to do a find/replace, so for more dynamic formulas this won't help much. But, I figured I'd put it up here anyway.

Readably print out a python dict() sorted by key

Another alternative :

>>> mydict = {'a':1, 'b':2, 'c':3}
>>> import json

Then with python2 :

>>> print json.dumps(mydict, indent=4, sort_keys=True) # python 2
{
    "a": 1, 
    "b": 2, 
    "c": 3
}

or with python 3 :

>>> print(json.dumps(mydict, indent=4, sort_keys=True)) # python 3
{
    "a": 1, 
    "b": 2, 
    "c": 3
}

How to view an HTML file in the browser with Visual Studio Code

Ctrl + F1 will open the default browser. alternatively you can hit Ctrl + shift + P to open command window and select "View in Browser". The html code must be saved in a file (unsaved code on the editor - without extension, doesn't work)

How do I count occurrence of duplicate items in array

$search_string = 4;
$original_array = [1,2,1,3,2,4,4,4,4,4,10];
$step1 = implode(",", $original_array); // convert original_array to string
$step2 = explode($search_string, $step1); // break step1 string into a new array using the search string as delimiter
$result = count($step2)-1; // count the number of elements in the resulting array, minus the first empty element
print_r($result); // result is 5

Image change every 30 seconds - loop

I agree with using frameworks for things like this, just because its easier. I hacked this up real quick, just fades an image out and then switches, also will not work in older versions of IE. But as you can see the code for the actual fade is much longer than the JQuery implementation posted by KARASZI István.

function changeImage() {
    var img = document.getElementById("img");
    img.src = images[x];
    x++;        
    if(x >= images.length) {
        x = 0;
    } 
    fadeImg(img, 100, true);
    setTimeout("changeImage()", 30000);
}

function fadeImg(el, val, fade) {
    if(fade === true) {
        val--;
    } else {
        val ++;
    }       
    if(val > 0 && val < 100) {
        el.style.opacity = val / 100;
        setTimeout(function(){ fadeImg(el, val, fade); }, 10);
    }
}

var images = [], x = 0;
images[0] = "image1.jpg";
images[1] = "image2.jpg";
images[2] = "image3.jpg";
setTimeout("changeImage()", 30000);

How to clear/delete the contents of a Tkinter Text widget?

A lot of answers ask you to use END, but if that's not working for you, try:

text.delete("1.0", "end-1c")

Find oldest/youngest datetime object in a list

have u tried this :

>>> from datetime import datetime as DT
>>> l =[]
>>> l.append(DT(1988,12,12))
>>> l.append(DT(1979,12,12))
>>> l.append(DT(1979,12,11))
>>> l.append(DT(2011,12,11))
>>> l.append(DT(2022,12,11))
>>> min(l)
datetime.datetime(1979, 12, 11, 0, 0)
>>> max(l)
datetime.datetime(2022, 12, 11, 0, 0)

Invalid length parameter passed to the LEFT or SUBSTRING function

Something else you can use is isnull:

isnull( SUBSTRING(PostCode, 1 , CHARINDEX(' ', PostCode ) -1), PostCode)

ggplot2 plot without axes, legends, etc

Re: changing opts to theme etc (for lazy folks):

theme(axis.line=element_blank(),
      axis.text.x=element_blank(),
      axis.text.y=element_blank(),
      axis.ticks=element_blank(),
      axis.title.x=element_blank(),
      axis.title.y=element_blank(),
      legend.position="none",
      panel.background=element_blank(),
      panel.border=element_blank(),
      panel.grid.major=element_blank(),
      panel.grid.minor=element_blank(),
      plot.background=element_blank())

Python unittest passing arguments

Even if the test gurus say that we should not do it: I do. In some context it makes a lot of sense to have parameters to drive the test in the right direction, for example:

which of the dozen identical USB cards should I use for this test now?
which server should I use for this test now?
which XXX should I use?

For me, the use of the environment variable is good enough for this puprose because you do not have to write dedicated code to pass your parameters around; it is supported by Python. It is clean and simple.

Of course, I'm not advocating for fully parametrizable tests. But we have to be pragmatic and, as I said, in some context you need a parameter or two. We should not abouse of it :)

import os
import unittest


class MyTest(unittest.TestCase):
    def setUp(self):
        self.var1 = os.environ["VAR1"]
        self.var2 = os.environ["VAR2"]

    def test_01(self):
        print("var1: {}, var2: {}".format(self.var1, self.var2))

Then from the command line (tested on Linux)

$ export VAR1=1
$ export VAR2=2
$ python -m unittest MyTest
var1: 1, var2: 2
.
----------------------------------------------------------------------
Ran 1 test in 0.000s

OK

How do I limit the number of rows returned by an Oracle query after ordering?

(untested) something like this may do the job

WITH
base AS
(
    select *                   -- get the table
    from sometable
    order by name              -- in the desired order
),
twenty AS
(
    select *                   -- get the first 30 rows
    from base
    where rownum < 30
    order by name              -- in the desired order
)
select *                       -- then get rows 21 .. 30
from twenty
where rownum > 20
order by name                  -- in the desired order

There is also the analytic function rank, that you can use to order by.

How to check if a string starts with "_" in PHP?

function starts_with($s, $prefix){
    // returns a bool
    return strpos($s, $prefix) === 0;
}

starts_with($variable, "_");

Ball to Ball Collision - Detection and Handling

I see it hinted here and there, but you could also do a faster calculation first, like, compare the bounding boxes for overlap, and THEN do a radius-based overlap if that first test passes.

The addition/difference math is much faster for a bounding box than all the trig for the radius, and most times, the bounding box test will dismiss the possibility of a collision. But if you then re-test with trig, you're getting the accurate results that you're seeking.

Yes, it's two tests, but it will be faster overall.

SQL Server: converting UniqueIdentifier to string in a case statement

I think I found the answer:

convert(nvarchar(50), RequestID)

Here's the link where I found this info:

http://msdn.microsoft.com/en-us/library/ms187928.aspx

MySQL ERROR 1045 (28000): Access denied for user 'bill'@'localhost' (using password: YES)

I resolved this by deleting the old buggy user 'bill' entries (this is the important part: both from mysql.user and mysql.db), then created the same user as sad before:

FLUSH PRIVILEGES;
CREATE USER bill@localhost IDENTIFIED BY 'passpass';
grant all privileges on *.* to bill@localhost with grant option;
FLUSH PRIVILEGES;

Worked, user is connecting. Now I'll remove some previlegies from it :)

The controller for path was not found or does not implement IController

Or maybe you missed keyword "Controller" at the end of controller name ;)

Bootstrap 3 collapsed menu doesn't close on click

Simple Try to make a function in javascript for dropdown collapse class.

Example:

JS:

$scope.toogleMyClass  = function(){

    //dropdown-element

    $timeout(function(){
        $scope.preLoader = false;
        $(document).ready(function() {
            $("#dropdown-element").toggleClass('show');
        });
    },100);

};

Hook this function to onClick simple works for me.

How to close form

There are different methods to open or close winform. Form.Close() is one method in closing a winform.

When 'Form.Close()' execute , all resources created in that form are destroyed. Resources means control and all its child controls (labels , buttons) , forms etc.

Some other methods to close winform

Form.Hide()
Application.Exit()

Some methods to Open/Start a form

Form.Show()
Form.ShowDialog()
Form.TopMost()

All of them act differently , Explore them !

Using a PagedList with a ViewModel ASP.Net MVC

For anyone who is trying to do it without modifying your ViewModels AND not loading all your records from the database.

Repository

    public List<Order> GetOrderPage(int page, int itemsPerPage, out int totalCount)
    {
        List<Order> orders = new List<Order>();
        using (DatabaseContext db = new DatabaseContext())
        {
            orders = (from o in db.Orders
                      orderby o.Date descending //use orderby, otherwise Skip will throw an error
                      select o)
                      .Skip(itemsPerPage * page).Take(itemsPerPage)
                      .ToList();
            totalCount = db.Orders.Count();//return the number of pages
        }
        return orders;//the query is now already executed, it is a subset of all the orders.
    }

Controller

    public ActionResult Index(int? page)
    {
        int pagenumber = (page ?? 1) -1; //I know what you're thinking, don't put it on 0 :)
        OrderManagement orderMan = new OrderManagement(HttpContext.ApplicationInstance.Context);
        int totalCount = 0;
        List<Order> orders = orderMan.GetOrderPage(pagenumber, 5, out totalCount);
        List<OrderViewModel> orderViews = new List<OrderViewModel>();
        foreach(Order order in orders)//convert your models to some view models.
        {
            orderViews.Add(orderMan.GenerateOrderViewModel(order));
        }
        //create staticPageList, defining your viewModel, current page, page size and total number of pages.
        IPagedList<OrderViewModel> pageOrders = new StaticPagedList<OrderViewModel>(orderViews, pagenumber + 1, 5, totalCount);
        return View(pageOrders);
    }

View

@using PagedList.Mvc;
@using PagedList; 

@model IPagedList<Babywatcher.Core.Models.OrderViewModel>

@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>
<div class="container-fluid">
    <p>
        @Html.ActionLink("Create New", "Create")
    </p>
    @if (Model.Count > 0)
    {


        <table class="table">
          <tr>
            <th>
                @Html.DisplayNameFor(model => model.First().orderId)
            </th>
            <!--rest of your stuff-->
        </table>

    }
    else
    {
        <p>No Orders yet.</p>
    }
    @Html.PagedListPager(Model, page => Url.Action("Index", new { page }))
</div>

Bonus

Do above first, then perhaps use this!

Since this question is about (view) models, I'm going to give away a little solution for you that will not only be useful for paging, but for the rest of your application if you want to keep your entities separate, only used in the repository, and have the rest of the application deal with models (which can be used as view models).

Repository

In your order repository (in my case), add a static method to convert a model:

public static OrderModel ConvertToModel(Order entity)
{
    if (entity == null) return null;
    OrderModel model = new OrderModel
    {
        ContactId = entity.contactId,
        OrderId = entity.orderId,
    }
    return model;
}

Below your repository class, add this:

public static partial class Ex
{
    public static IEnumerable<OrderModel> SelectOrderModel(this IEnumerable<Order> source)
    {
        bool includeRelations = source.GetType() != typeof(DbQuery<Order>);
        return source.Select(x => new OrderModel
        {
            OrderId = x.orderId,
            //example use ConvertToModel of some other repository
            BillingAddress = includeRelations ? AddressRepository.ConvertToModel(x.BillingAddress) : null,
            //example use another extension of some other repository
            Shipments = includeRelations && x.Shipments != null ? x.Shipments.SelectShipmentModel() : null
        });
    }
}

And then in your GetOrderPage method:

    public IEnumerable<OrderModel> GetOrderPage(int page, int itemsPerPage, string searchString, string sortOrder, int? partnerId,
        out int totalCount)
    {
        IQueryable<Order> query = DbContext.Orders; //get queryable from db
        .....//do your filtering, sorting, paging (do not use .ToList() yet)

        return queryOrders.SelectOrderModel().AsEnumerable();
        //or, if you want to include relations
        return queryOrders.Include(x => x.BillingAddress).ToList().SelectOrderModel();
        //notice difference, first ToList(), then SelectOrderModel().
    }

Let me explain:

The static ConvertToModel method can be accessed by any other repository, as used above, I use ConvertToModel from some AddressRepository.

The extension class/method lets you convert an entity to a model. This can be IQueryable or any other list, collection.

Now here comes the magic: If you have executed the query BEFORE calling SelectOrderModel() extension, includeRelations inside the extension will be true because the source is NOT a database query type (not an linq-to-sql IQueryable). When this is true, the extension can call other methods/extensions throughout your application for converting models.

Now on the other side: You can first execute the extension and then continue doing LINQ filtering. The filtering will happen in the database eventually, because you did not do a .ToList() yet, the extension is just an layer of dealing with your queries. Linq-to-sql will eventually know what filtering to apply in the Database. The inlcudeRelations will be false so that it doesn't call other c# methods that SQL doesn't understand.

It looks complicated at first, extensions might be something new, but it's really useful. Eventually when you have set this up for all repositories, simply an .Include() extra will load the relations.

AngularJS sorting rows by table header

I had found the easiest way to solve this question. If efficient you can use

HTML code: import angular.min.js and the angular.route.js library

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>like/dislike</title>
</head>
<body ng-app="myapp" ng-controller="likedislikecntrl" bgcolor="#9acd32">
<script src="./modules/angular.min.js"></script>
<script src="./modules/angular-route.js"></script>
<script src="./likedislikecntrl.js"></script>
</select></h1></p>
<table border="5" align="center">
<thead>
<th>professorname <select ng-model="sort1" style="background-color: 
chartreuse">
<option value="+name" >asc</option>
<option value="-name" >desc</option>
</select></th>
<th >Subject <select ng-model="sort1">
<option value="+subject" >asc</option>
<option value="-subject" >desc</option></select></th>
<th >Gender <select ng-model="sort1">
<option value="+gender">asc</option>
<option value="-gender">desc</option></select></th>
<th >Likes <select ng-model="sort1">
<option value="+likes" >asc</option>
<option value="-likes" >desc</option></select></th>
<th >Dislikes <select ng-model="sort1">
<option value="+dislikes" >asc</option>
<option value="-dislikes">desc</option></select></th>
<th rowspan="2">Like/Dislike</th>
</thead>
<tbody>
<tr ng-repeat="sir in sirs | orderBy:sort1|orderBy:sort|limitTo:row" >
<td >{{sir.name}}</td>
<td>{{sir.subject|uppercase}}</td>
<td>{{sir.gender|lowercase}}</td>
<td>{{sir.likes}}</td>
<td>{{sir.dislikes}}</td>
<td><button ng-click="ldfi1(sir)" style="background-color:chartreuse" 
>Like</button></td>
<td><button ng-click="ldfd1(sir)" style="background-
color:chartreuse">Dislike</button></td>
</tr>
</tbody>
</table>
</body> 
</html>
JavaScript Code::likedislikecntrl.js

var app=angular.module("myapp",["ngRoute"]);

app.controller("likedislikecntrl",function ($scope) {
var sirs=[
    {name:"Srinivas",subject:"dmdw",gender:"male",likes:0,dislikes:0},
    {name:"Sharif",subject:"dms",gender:"male",likes:0,dislikes:0},
    {name:"Chaitanya",subject:"daa",gender:"male",likes:0,dislikes:0},
    {name:"Pranav",subject:"wt",gender:"male",likes:0,dislikes:0},
    {name:"Anil Chowdary",subject:"ds",gender:"male",likes:0,dislikes:0},
    {name:"Rajesh",subject:"mp",gender:"male",likes:0,dislikes:0},
    {name:"Deepak",subject:"dld",gender:"male",likes:0,dislikes:0},
    {name:"JP",subject:"mp",gender:"male",likes:0,dislikes:0},
    {name:"NagaDeepthi",subject:"oose",gender:"female",likes:0,dislikes:0},
    {name:"Swathi",subject:"ca",gender:"female",likes:0,dislikes:0},
    {name:"Madavilatha",subject:"cn",gender:"female",likes:0,dislikes:0}



]
$scope.sirs=sirs;
$scope.ldfi1=function (sir) {
    sir.likes++

}
$scope.ldfd1=function (sir) {
   sir.dislikes++

}
$scope.row=8;

})

Int to Decimal Conversion - Insert decimal point at specified location

Declare it as a decimal which uses the int variable and divide this by 100

int number = 700
decimal correctNumber = (decimal)number / 100;

Edit: Bala was faster with his reaction

How to make a class property?

[answer written based on python 3.4; the metaclass syntax differs in 2 but I think the technique will still work]

You can do this with a metaclass...mostly. Dappawit's almost works, but I think it has a flaw:

class MetaFoo(type):
    @property
    def thingy(cls):
        return cls._thingy

class Foo(object, metaclass=MetaFoo):
    _thingy = 23

This gets you a classproperty on Foo, but there's a problem...

print("Foo.thingy is {}".format(Foo.thingy))
# Foo.thingy is 23
# Yay, the classmethod-property is working as intended!
foo = Foo()
if hasattr(foo, "thingy"):
    print("Foo().thingy is {}".format(foo.thingy))
else:
    print("Foo instance has no attribute 'thingy'")
# Foo instance has no attribute 'thingy'
# Wha....?

What the hell is going on here? Why can't I reach the class property from an instance?

I was beating my head on this for quite a while before finding what I believe is the answer. Python @properties are a subset of descriptors, and, from the descriptor documentation (emphasis mine):

The default behavior for attribute access is to get, set, or delete the attribute from an object’s dictionary. For instance, a.x has a lookup chain starting with a.__dict__['x'], then type(a).__dict__['x'], and continuing through the base classes of type(a) excluding metaclasses.

So the method resolution order doesn't include our class properties (or anything else defined in the metaclass). It is possible to make a subclass of the built-in property decorator that behaves differently, but (citation needed) I've gotten the impression googling that the developers had a good reason (which I do not understand) for doing it that way.

That doesn't mean we're out of luck; we can access the properties on the class itself just fine...and we can get the class from type(self) within the instance, which we can use to make @property dispatchers:

class Foo(object, metaclass=MetaFoo):
    _thingy = 23

    @property
    def thingy(self):
        return type(self).thingy

Now Foo().thingy works as intended for both the class and the instances! It will also continue to do the right thing if a derived class replaces its underlying _thingy (which is the use case that got me on this hunt originally).

This isn't 100% satisfying to me -- having to do setup in both the metaclass and object class feels like it violates the DRY principle. But the latter is just a one-line dispatcher; I'm mostly okay with it existing, and you could probably compact it down to a lambda or something if you really wanted.

How to add an element to Array and shift indexes?

If you prefer to use Apache Commons instead of reinventing the wheel, the current approach is this:

a = ArrayUtils.insert(4, a, 87);

It used to be ArrayUtils.add(...) but that was deprecated a while ago. More info here: 1

How to auto-scroll to end of div when data is added?

If you don't know when data will be added to #data, you could set an interval to update the element's scrollTop to its scrollHeight every couple of seconds. If you are controlling when data is added, just call the internal of the following function after the data has been added.

window.setInterval(function() {
  var elem = document.getElementById('data');
  elem.scrollTop = elem.scrollHeight;
}, 5000);

How can I find out a file's MIME type (Content-Type)?

file version < 5 : file -i -b /path/to/file
file version >=5 : file --mime-type -b /path/to/file

(HTML) Download a PDF file instead of opening them in browser when clicked

As the html5 way (my previous answer) is not available in all browsers, heres another slightly hack way.

This solution requires you are serving the intended file from same domain, OR has CORS permission.

First download the content of the file via XMLHttpRequest(Ajax).
Then make a data URI by base64 encoding the content of the file and set media-type to application/octet-stream. Result should look like

data:application/octet-stream;base64,SGVsbG8sIFdvcmxkIQ%3D%3D

Now set location.href = data. This will cause the browser to download the file. Unfortunately you can't set file name or extension this way. Fiddling with the media-type could yield something.

See details: https://developer.mozilla.org/en-US/docs/Web/HTTP/data_URIs

How do I execute a file in Cygwin?

To execute a file in the current directory, the syntax to use is: ./foo

As mentioned by allain, ./a.exe is the correct way to execute a.exe in the working directory using Cygwin.

Note: You may wish to use the -o parameter to cc to specify your own output filename. An example of this would be: cc helloworld.c -o helloworld.exe.

What is the difference between public, private, and protected?

Visibility Scopes with Abstract Examples :: Makes easy Understanding

This visibility of a property or method is defined by pre-fixing declaration of one of three keyword (Public, protected and private)

Public : If a property or method is defined as public, it means it can be both access and manipulated by anything that can refer to object.

Abstract eg. Think public visibility scope as "public picnic" that anybody can come to.

Protected : when a property or method visibility is set to protected members can only be access within the class itself and by inherited & inheriting classes. (Inherited:- a class can have all the properties and methods of another class).

Think as a protected visibility scope as "Company picnic" where company members and their family members are allowed not the public. It's the most common scope restriction.

Private : When a property or method visibility is set to private, only the class that has the private members can access those methods and properties(Internally within the class), despite of whatever class relation there maybe.

with picnic analogy think as a "company picnic where only the company members are allowed" in the picnic. not family neither general public are allowed.

How to detect chrome and safari browser (webkit)

Most of the answers here are obsolete, there is no more jQuery.browser, and why would anyone even use jQuery or would sniff the User Agent is beyond me.

Instead of detecting a browser, you should rather detect a feature
(whether it's supported or not).

The following is false in Mozilla Firefox, Microsoft Edge; it is true in Google Chrome.

"webkitLineBreak" in document.documentElement.style

Note this is not future-proof. A browser could implement the -webkit-line-break property at any time in the future, thus resulting in false detection. Then you can just look at the document object in Chrome and pick anything with webkit prefix and check for that to be missing in other browsers.

ALTER TABLE ADD COLUMN IF NOT EXISTS in SQLite

I solve it in 2 queries. This is my Unity3D script using System.Data.SQLite.

IDbCommand command = dbConnection.CreateCommand();
            command.CommandText = @"SELECT count(*) FROM pragma_table_info('Candidat') c WHERE c.name = 'BirthPlace'";
            IDataReader reader = command.ExecuteReader();
            while (reader.Read())
            {
                try
                {
                    if (int.TryParse(reader[0].ToString(), out int result))
                    {
                        if (result == 0)
                        {
                            command = dbConnection.CreateCommand();
                            command.CommandText = @"ALTER TABLE Candidat ADD COLUMN BirthPlace VARCHAR";
                            command.ExecuteNonQuery();
                            command.Dispose();
                        }
                    }
                }
                catch { throw; }
            }

BadValue Invalid or no user locale set. Please ensure LANG and/or LC_* environment variables are set correctly

vim /etc/default/locale

add to it:

LC_ALL="en_US.UTF-8"

jQuery - Create hidden form element on the fly

if you want to add more attributes just do like:

$('<input>').attr('type','hidden').attr('name','foo[]').attr('value','bar').appendTo('form');

$('<input>').attr({
    type: 'hidden',
    id: 'foo',
    name: 'foo[]',
    value: 'bar'
}).appendTo('form');

Using ng-click vs bind within link function of Angular Directive

myApp.directive("clickme",function(){
    return function(scope,element,attrs){
        element.bind("mousedown",function(){
             <<call the Controller function>>
              scope.loadEditfrm(attrs.edtbtn); 
        });
    };
});

this will act as onclick events on the attribute clickme

Eclipse: Java was started but returned error code=13

I also faced the error code when i upgraded my java version to 1.8. The problem was with my eclipse.

My jdk which was installed on my system is of 32 - bit and my eclipse was of 64 - bit.

So solve this problem i downloaded the 32 - bit eclipse.

IMO this Architecture miss match problem

Plese match your architecture type of JDK and eclipse.

how to display variable value in alert box?

document.getElementById('one').innerText;
alert(content);

It does not print the value; But, if done this way

document.getElementById('one').value;
alert(content);

SQL Inner Join On Null Values

Basically you want to join two tables together where their QID columns are both not null, correct? However, you aren't enforcing any other conditions, such as that the two QID values (which seems strange to me, but ok). Something as simple as the following (tested in MySQL) seems to do what you want:

SELECT * FROM `Y` INNER JOIN `X` ON (`Y`.`QID` IS NOT NULL AND `X`.`QID` IS NOT NULL);

This gives you every non-null row in Y joined to every non-null row in X.

Update: Rico says he also wants the rows with NULL values, why not just:

SELECT * FROM `Y` INNER JOIN `X`;

What does "implements" do on a class?

You should look into Java's interfaces. A quick Google search revealed this page, which looks pretty good.

I like to think of an interface as a "promise" of sorts: Any class that implements it has certain behavior that can be expected of it, and therefore you can put an instance of an implementing class into an interface-type reference.

A simple example is the java.lang.Comparable interface. By implementing all methods in this interface in your own class, you are claiming that your objects are "comparable" to one another, and can be partially ordered.

Implementing an interface requires two steps:

Declaring that the interface is implemented in the class declaration
Providing definitions for ALL methods that are part of the interface.

Interface java.lang.Comparable has just one method in it, public int compareTo(Object other). So you need to provide that method.

Here's an example. Given this class RationalNumber:

public class RationalNumber
{
    public int numerator;
    public int denominator;

    public RationalNumber(int num, int den)
    {
        this.numerator = num;
        this.denominator = den;
    }
}

(Note: It's generally bad practice in Java to have public fields, but I am intending this to be a very simple plain-old-data type so I don't care about public fields!)

If I want to be able to compare two RationalNumber instances (for sorting purposes, maybe?), I can do that by implementing the java.lang.Comparable interface. In order to do that, two things need to be done: provide a definition for compareTo and declare that the interface is implemented.

Here's how the fleshed-out class might look:

public class RationalNumber implements java.lang.Comparable
{
    public int numerator;
    public int denominator;

    public RationalNumber(int num, int den)
    {
        this.numerator = num;
        this.denominator = den;
    }

    public int compareTo(Object other)
    {
        if (other == null || !(other instanceof RationalNumber))
        {
            return -1; // Put this object before non-RationalNumber objects
        }

        RationalNumber r = (RationalNumber)other;

        // Do the calculations by cross-multiplying. This isn't really important to
        // the answer, but the point is we're comparing the two rational numbers.
        // And no, I don't care if it's mathematically inaccurate.

        int myTotal = this.numerator * other.denominator;
        int theirTotal = other.numerator * this.denominator;

        if (myTotal < theirTotal) return -1;
        if (myTotal > theirTotal) return 1;
        return 0;
    }
}

You're probably thinking, what was the point of all this? The answer is when you look at methods like this: sorting algorithms that just expect "some kind of comparable object". (Note the requirement that all objects must implement java.lang.Comparable!) That method can take lists of ANY kind of comparable objects, be they Strings or Integers or RationalNumbers.

NOTE: I'm using practices from Java 1.4 in this answer. java.lang.Comparable is now a generic interface, but I don't have time to explain generics.

Dataframe to Excel sheet

From your above needs, you will need to use both Python (to export pandas data frame) and VBA (to delete existing worksheet content and copy/paste external data).

With Python: use the to_csv or to_excel methods. I recommend the to_csv method which performs better with larger datasets.

# DF TO EXCEL
from pandas import ExcelWriter

writer = ExcelWriter('PythonExport.xlsx')
yourdf.to_excel(writer,'Sheet5')
writer.save()

# DF TO CSV
yourdf.to_csv('PythonExport.csv', sep=',')

With VBA: copy and paste source to destination ranges.

Fortunately, in VBA you can call Python scripts using Shell (assuming your OS is Windows).

Sub DataFrameImport()
  'RUN PYTHON TO EXPORT DATA FRAME
  Shell "C:\pathTo\python.exe fullpathOfPythonScript.py", vbNormalFocus

  'CLEAR EXISTING CONTENT
  ThisWorkbook.Worksheets(5).Cells.Clear

  'COPY AND PASTE TO WORKBOOK
  Workbooks("PythonExport").Worksheets(1).Cells.Copy
  ThisWorkbook.Worksheets(5).Range("A1").Select
  ThisWorkbook.Worksheets(5).Paste
End Sub

Alternatively, you can do vice versa: run a macro (ClearExistingContent) with Python. Be sure your Excel file is a macro-enabled (.xlsm) one with a saved macro to delete Sheet 5 content only. Note: macros cannot be saved with csv files.

import os
import win32com.client
from pandas import ExcelWriter

if os.path.exists("C:\Full Location\To\excelsheet.xlsm"):
  xlApp=win32com.client.Dispatch("Excel.Application")
  wb = xlApp.Workbooks.Open(Filename="C:\Full Location\To\excelsheet.xlsm")

  # MACRO TO CLEAR SHEET 5 CONTENT
  xlApp.Run("ClearExistingContent")
  wb.Save() 
  xlApp.Quit()
  del xl

  # WRITE IN DATA FRAME TO SHEET 5
  writer = ExcelWriter('C:\Full Location\To\excelsheet.xlsm')
  yourdf.to_excel(writer,'Sheet5')
  writer.save()

What is the difference between UTF-8 and Unicode?

Unicode is just a standard that defines a character set (UCS) and encodings (UTF) to encode this character set. But in general, Unicode is refered to the character set and not the standard.

Read The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets (No Excuses!) and Unicode In 5 Minutes.

How do I set environment variables from Java?

(Is it because this is Java and therefore I shouldn't be doing evil nonportable obsolete things like touching my environment?)

I think you've hit the nail on the head.

A possible way to ease the burden would be to factor out a method

void setUpEnvironment(ProcessBuilder builder) {
    Map<String, String> env = builder.environment();
    // blah blah
}

and pass any ProcessBuilders through it before starting them.

Also, you probably already know this, but you can start more than one process with the same ProcessBuilder. So if your subprocesses are the same, you don't need to do this setup over and over.

Add row to query result using select

is it possible to extend query results with literals like this?

Yes.

Select Name
From Customers
UNION ALL
Select 'Jason'

Use UNION to add Jason if it isn't already in the result set.
Use UNION ALL to add Jason whether or not he's already in the result set.

Javascript Date Validation ( DD/MM/YYYY) & Age Checking

If you want to use forward slashes in the format, the you need to escape with back slashes in the regex:

_x000D_

   _x000D_
var dateformat = /^(0?[1-9]|1[012])[\/\-](0?[1-9]|[12][0-9]|3[01])[\/\-]\d{4}$/;

_x000D_

How to change the foreign key referential action? (behavior)

I had a bunch of FKs to alter, so I wrote something to make the statements for me. Figured I'd share:

SELECT

CONCAT('ALTER TABLE `' ,rc.TABLE_NAME,
    '` DROP FOREIGN KEY `' ,rc.CONSTRAINT_NAME,'`;')
, CONCAT('ALTER TABLE `' ,rc.TABLE_NAME,
    '` ADD CONSTRAINT `' ,rc.CONSTRAINT_NAME ,'` FOREIGN KEY (`',kcu.COLUMN_NAME,
    '`) REFERENCES `',kcu.REFERENCED_TABLE_NAME,'` (`',kcu.REFERENCED_COLUMN_NAME,'`) ON DELETE CASCADE;')

FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS rc
LEFT OUTER JOIN INFORMATION_SCHEMA.KEY_COLUMN_USAGE kcu
    ON kcu.TABLE_SCHEMA = rc.CONSTRAINT_SCHEMA
    AND kcu.CONSTRAINT_NAME = rc.CONSTRAINT_NAME
WHERE DELETE_RULE = 'NO ACTION'
AND rc.CONSTRAINT_SCHEMA = 'foo'

Does Spring Data JPA have any way to count entites using method name resolving?

Thanks you all! Now it's work. DATAJPA-231

It will be nice if was possible to create count…By… methods just like find…By ones. Example:

public interface UserRepository extends JpaRepository<User, Long> {

   public Long /*or BigInteger */ countByActiveTrue();
}

glm rotate usage in Opengl

GLM has good example of rotation : http://glm.g-truc.net/code.html

glm::mat4 Projection = glm::perspective(45.0f, 4.0f / 3.0f, 0.1f, 100.f);
glm::mat4 ViewTranslate = glm::translate(
    glm::mat4(1.0f),
    glm::vec3(0.0f, 0.0f, -Translate)
);
glm::mat4 ViewRotateX = glm::rotate(
    ViewTranslate,
    Rotate.y,
    glm::vec3(-1.0f, 0.0f, 0.0f)
);
glm::mat4 View = glm::rotate(
    ViewRotateX,
    Rotate.x,
    glm::vec3(0.0f, 1.0f, 0.0f)
);
glm::mat4 Model = glm::scale(
    glm::mat4(1.0f),
    glm::vec3(0.5f)
);
glm::mat4 MVP = Projection * View * Model;
glUniformMatrix4fv(LocationMVP, 1, GL_FALSE, glm::value_ptr(MVP));

Angular2 - TypeScript : Increment a number after timeout in AppComponent

This is not valid TypeScript code. You can not have method invocations in the body of a class.

// INVALID CODE
export class AppComponent {
  public n: number = 1;
  setTimeout(function() {
    n = n + 10;
  }, 1000);
}

Instead move the setTimeout call to the constructor of the class. Additionally, use the arrow function => to gain access to this.

export class AppComponent {
  public n: number = 1;

  constructor() {
    setTimeout(() => {
      this.n = this.n + 10;
    }, 1000);
  }

}

In TypeScript, you can only refer to class properties or methods via this. That's why the arrow function => is important.

iOS: how to perform a HTTP POST request?

NOTE: Pure Swift 3 (Xcode 8) example: Please try out the following sample code. It is the simple example of dataTask function of URLSession.

func simpleDataRequest() {

        //Get the url from url string
        let url:URL = URL(string: "YOUR URL STRING")!

        //Get the session instance
        let session = URLSession.shared

        //Create Mutable url request
        var request = URLRequest(url: url as URL)

        //Set the http method type
        request.httpMethod = "POST"

        //Set the cache policy
        request.cachePolicy = URLRequest.CachePolicy.reloadIgnoringCacheData

        //Post parameter
        let paramString = "key=value"

        //Set the post param as the request body
        request.httpBody = paramString.data(using: String.Encoding.utf8)

        let task = session.dataTask(with: request as URLRequest) {
            (data, response, error) in

            guard let _:Data = data as Data?, let _:URLResponse = response  , error == nil else {

                //Oops! Error occured.
                print("error")
                return
            }

            //Get the raw response string
            let dataString = String(data: data!, encoding: String.Encoding(rawValue: String.Encoding.utf8.rawValue))

            //Print the response
            print(dataString!)

        }

        //resume the task
        task.resume()

    }

How add items(Text & Value) to ComboBox & read them in SelectedIndexChanged (SelectedValue = null)

Dictionary<int,string> comboSource = new Dictionary<int,string>();
comboSource.Add(1, "Sunday");
comboSource.Add(2, "Monday");

Aftr adding values to Dictionary, use this as combobox datasource:

comboBox1.DataSource = new BindingSource(comboSource, null);
comboBox1.DisplayMember = "Value";
comboBox1.ValueMember = "Key";

python NameError: name 'file' is not defined

To solve this error, it is enough to add from google.colab import files in your code!

how to rename an index in a cluster?

For renaming your index you can use Elasticsearch Snapshot module.

First you have to take snapshot of your index.while restoring it you can rename your index.

    POST /_snapshot/my_backup/snapshot_1/_restore
    {
     "indices": "jal",
     "ignore_unavailable": "true",
     "include_global_state": false,
     "rename_pattern": "jal",
     "rename_replacement": "jal1"
     }

rename_replacement :-New indexname in which you want backup your data.

Updating .class file in jar

An alternative is not to replace the .class file in the jar file. Instead put it into a new jar file and ensure that it appears earlier on your classpath than the original jar file.

Not sure I would recommend this for production software but for development it is quick and easy.

How to use Select2 with JSON via Ajax request?

Tthe problems may be caused by incorrect mapping. Are you sure you have your result set in "data"? In my example, the backend code returns results under "items" key, so the mapping should look like:

results: $.map(data.items, function (item) {
....
}

and not:

 results: $.map(data, function (item) {
    ....
    }

Practical uses for AtomicInteger

If you look at the methods AtomicInteger has, you'll notice that they tend to correspond to common operations on ints. For instance:

static AtomicInteger i;

// Later, in a thread
int current = i.incrementAndGet();

is the thread-safe version of this:

static int i;

// Later, in a thread
int current = ++i;

The methods map like this:
++i is i.incrementAndGet()
i++ is i.getAndIncrement()
--i is i.decrementAndGet()
i-- is i.getAndDecrement()
i = x is i.set(x)
x = i is x = i.get()

There are other convenience methods as well, like compareAndSet or addAndGet

Fire event on enter key press for a textbox

ahaliav fox 's answer is correct, however there's a small coding problem.
Change

<%=Button1.UniqueId%>

<%=Button1.UniqueID%>

it is case sensitive. Control.UniqueID Property

Error 14 'System.Web.UI.WebControls.Button' does not contain a definition for 'UniqueId' and no extension method 'UniqueId' accepting a first argument of type 'System.Web.UI.WebControls.Button' could be found (are you missing a using directive or an assembly reference?)

N.b. I tried the TextChanged event myself on AutoPostBack before searching for the answer, and although it is almost right it doesn't give the desired result I wanted nor for the question asked. It fires on losing focus on the Textbox and not when pressing the return key.

'nuget' is not recognized but other nuget commands working

Right-click on your project in solution explorer.
Select Manage NuGet Packages for Solution.
Search NuGet.CommandLine by Microsoft and Install it.
On complete installation, you will find a folder named packages in your project. Go to solution explorer and look for it.
Inside packages look for a folder named NuGet.CommandLine.3.5.0, here 3.5.0 is just version name your folder name will change accordingly.
Inside NuGet.CommandLine.3.5.0 look for a folder named tools.
Inside tools you will get your nuget.exe

How do I get the old value of a changed cell in Excel VBA?

Here's a way I've used in the past. Please note that you have to add a reference to the Microsoft Scripting Runtime so you can use the Dictionary object - if you don't want to add that reference you can do this with Collections but they're slower and there's no elegant way to check .Exists (you have to trap the error).

Dim OldVals As New Dictionary
Private Sub Worksheet_Change(ByVal Target As Range)
Dim cell As Range
    For Each cell In Target
        If OldVals.Exists(cell.Address) Then
            Debug.Print "New value of " & cell.Address & " is " & cell.Value & "; old value was " & OldVals(cell.Address)
        Else
            Debug.Print "No old value for " + cell.Address
        End If
        OldVals(cell.Address) = cell.Value
    Next
End Sub

Like any similar method, this has its problems - first off, it won't know the "old" value until the value has actually been changed. To fix this you'd need to trap the Open event on the workbook and go through Sheet.UsedRange populating OldVals. Also, it will lose all its data if you reset the VBA project by stopping the debugger or some such.

Find running median from a stream of integers

If we want to find the median of the n most recently seen elements, this problem has an exact solution that only needs the n most recently seen elements to be kept in memory. It is fast and scales well.

An indexable skiplist supports O(ln n) insertion, removal, and indexed search of arbitrary elements while maintaining sorted order. When coupled with a FIFO queue that tracks the n-th oldest entry, the solution is simple:

class RunningMedian:
    'Fast running median with O(lg n) updates where n is the window size'

    def __init__(self, n, iterable):
        self.it = iter(iterable)
        self.queue = deque(islice(self.it, n))
        self.skiplist = IndexableSkiplist(n)
        for elem in self.queue:
            self.skiplist.insert(elem)

    def __iter__(self):
        queue = self.queue
        skiplist = self.skiplist
        midpoint = len(queue) // 2
        yield skiplist[midpoint]
        for newelem in self.it:
            oldelem = queue.popleft()
            skiplist.remove(oldelem)
            queue.append(newelem)
            skiplist.insert(newelem)
            yield skiplist[midpoint]

Here are links to complete working code (an easy-to-understand class version and an optimized generator version with the indexable skiplist code inlined):

How do I check if the user is pressing a key?

Try this:

import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JTextField;

public class Main {

    public static void main(String[] argv) throws Exception {

    JTextField textField = new JTextField();

    textField.addKeyListener(new Keychecker());

    JFrame jframe = new JFrame();

    jframe.add(textField);

    jframe.setSize(400, 350);

    jframe.setVisible(true);

}

class Keychecker extends KeyAdapter {

    @Override
    public void keyPressed(KeyEvent event) {

        char ch = event.getKeyChar();

        System.out.println(event.getKeyChar());

    }

}

How to break lines in PowerShell?

You can also just use:

Write-Host "";

Or, to put it in terms of your specific question:

$str = ""
foreach($line in $file){
  if($line -Match $review){ #Special condition
    $str += Write-Host ""
    $str += ANSWER #looking for ANSWER
  }
  #code.....
}

Regular Expression - 2 letters and 2 numbers in C#

Just for fun, here's a non-regex (more readable/maintainable for simpletons like me) solution:

string myString = "AB12";

if( Char.IsLetter(myString, 0) && 
    Char.IsLetter(myString, 1) && 
    Char.IsNumber(myString, 2) &&
    Char.IsNumber(myString, 3)) {
    // First two are letters, second two are numbers
}
else {
    // Validation failed
}

EDIT

It seems that I've misunderstood the requirements. The code below will ensure that the first two characters and last two characters of a string validate (so long as the length of the string is > 3)

string myString = "AB12";

if(myString.Length > 3) {    
    if( Char.IsLetter(myString, 0) && 
        Char.IsLetter(myString, 1) && 
        Char.IsNumber(myString, (myString.Length - 2)) &&
        Char.IsNumber(myString, (myString.Length - 1))) {
        // First two are letters, second two are numbers
      }
      else {
        // Validation failed
    }
}
else {
   // Validation failed
}

How to combine multiple conditions to subset a data-frame using "OR"?

my.data.frame <- subset(data , V1 > 2 | V2 < 4)

An alternative solution that mimics the behavior of this function and would be more appropriate for inclusion within a function body:

new.data <- data[ which( data$V1 > 2 | data$V2 < 4) , ]

Some people criticize the use of which as not needed, but it does prevent the NA values from throwing back unwanted results. The equivalent (.i.e not returning NA-rows for any NA's in V1 or V2) to the two options demonstrated above without the which would be:

 new.data <- data[ !is.na(data$V1 | data$V2) & ( data$V1 > 2 | data$V2 < 4)  , ]

Note: I want to thank the anonymous contributor that attempted to fix the error in the code immediately above, a fix that got rejected by the moderators. There was actually an additional error that I noticed when I was correcting the first one. The conditional clause that checks for NA values needs to be first if it is to be handled as I intended, since ...

> NA & 1
[1] NA
> 0 & NA
[1] FALSE

Order of arguments may matter when using '&".

Reverse Contents in Array

my approach is swapping the first and last element of the array

int i,j;
for ( i = 0,j = size - 1 ; i < j ; i++,j--)
{  
    int temp = A[i];
    A[i] = A[j];
    A[j] = temp; 
}

Is it possible to specify a different ssh port when using rsync?

I found this solution on Mike Hike Hostetler's site that worked perfectly for me.

# rsync -avz -e "ssh -p $portNumber" user@remoteip:/path/to/files/ /local/path/

Using android.support.v7.widget.CardView in my project (Eclipse)

Using Gradle or Android Studio, try adding a dependency on com.android.support:cardview-v7.

There does not seem to be a regular Android library project at this time for cardview-v7, leanback-v17, palette-v7, or recyclerview-v7. I have no idea if/when Google will ship such library projects.

Check if a class is derived from a generic class

Try this code

static bool IsSubclassOfRawGeneric(Type generic, Type toCheck) {
    while (toCheck != null && toCheck != typeof(object)) {
        var cur = toCheck.IsGenericType ? toCheck.GetGenericTypeDefinition() : toCheck;
        if (generic == cur) {
            return true;
        }
        toCheck = toCheck.BaseType;
    }
    return false;
}

Checking if a date is valid in javascript

Try this:

var date = new Date();
console.log(date instanceof Date && !isNaN(date.valueOf()));

This should return true.

UPDATED: Added isNaN check to handle the case commented by Julian H. Lam

C# using streams

Streams are good for dealing with large amounts of data. When it's impractical to load all the data into memory at the same time, you can open it as a stream and work with small chunks of it.

Proper use of 'yield return'

This is kinda besides the point, but since the question is tagged best-practices I'll go ahead and throw in my two cents. For this type of thing I greatly prefer to make it into a property:

public static IEnumerable<Product> AllProducts
{
    get {
        using (AdventureWorksEntities db = new AdventureWorksEntities()) {
            var products = from product in db.Product
                           select product;

            return products;
        }
    }
}

Sure, it's a little more boiler-plate, but the code that uses this will look much cleaner:

prices = Whatever.AllProducts.Select (product => product.price);

prices = Whatever.GetAllProducts().Select (product => product.price);

Note: I wouldn't do this for any methods that may take a while to do their work.

How do I upgrade PHP in Mac OS X?

Before I go on, I have the latest version (v5.0.15) of OS X Server (yes, horrible, I know...however, the web server seems to work A-OK). I searched high and low for days trying to update (or at least get Apache to point to) a new version of PHP. My mcrypt did not work, along with other extensions and I installed and reinstalled PHP countless times from http://php-osx.liip.ch/ and other tutorials until I finally noticed a tid-bit of information written in a comment in one of the many different .conf files OS X Server keeps which was that OS X Server loads it's own custom .conf file before it loads the Apache httpd.conf (located at /etc/apache2/httpd.conf). The server file is located:

/Library/Server/Web/Config/apache2/httpd_server_app.conf

When you open this file, you have to comment out this line like so:

#LoadModule php5_module libexec/apache2/libphp5.so

Then add in the correct path (which should already be installed if you have installed via the http://php-osx.liip.ch/ link):

LoadModule php5_module /usr/local/php5/libphp5.so

After this modification, my PHP finally loaded the correct PHP installation. That being said, if things go wonky, it may be because OS X is made to work off the native installation of PHP at the time of OS X installation. To revert, just undo the change above.

Anyway, hopefully this is helpful for anyone else spending countless hours on this.

Will the IE9 WebBrowser Control Support all of IE9's features, including SVG?

I had the same problem, and the registry answers here didn't work.

I had a browser control in new version of my program that worked fine on XP, failed in Windows 7 (64 bit). The old version worked on both XP and Windows 7.

The webpage displayed in the browser uses some strange plugin for showing old SVG maps (I think its a Java applet).

Turns out the problem is related to DEP protection in Windows 7.

Old versions of dotnet 2 didn't set the DEP required flag in the exe, but from dotnet 2, SP 1 onwards it did (yep, the compiling behaviour and hence runtime behaviour of exe changed depending on which machine you compiled on, nice ...).

It is documented on a MSDN blog NXCOMPAT and the C# compiler. To quote : This will undoubtedly surprise a few developers...download a framework service pack, recompile, run your app, and you're now getting IP_ON_HEAP exceptions.

Adding the following to the post build in Visual Studio, turns DEP off for the exe, and everything works as expected:

all "$(DevEnvDir)..\tools\vsvars32.bat"
editbin.exe /NXCOMPAT:NO "$(TargetPath)"

Editbin documentation
Dumpbin /headers will display the DEP setting on a exe.

How to change JFrame icon

Add the following code within the constructor like so:

public Calculator() {
    initComponents();
//the code to be added        this.setIconImage(newImageIcon(getClass().getResource("color.png")).getImage());     }

Change "color.png" to the file name of the picture you want to insert. Drag and drop this picture onto the package (under Source Packages) of your project.

Run your project.

Reference list item by index within Django template?

A better way: custom template filter: https://docs.djangoproject.com/en/dev/howto/custom-template-tags/

such as get my_list[x] in templates:

in template

{% load index %}
{{ my_list|index:x }}

templatetags/index.py

from django import template
register = template.Library()

@register.filter
def index(indexable, i):
    return indexable[i]

if my_list = [['a','b','c'], ['d','e','f']], you can use {{ my_list|index:x|index:y }} in template to get my_list[x][y]

It works fine with "for"

{{ my_list|index:forloop.counter0 }}

Tested and works well ^_^

Selenium Error - The HTTP request to the remote WebDriver timed out after 60 seconds

For ChromeDriver the below worked for me:

string chromeDriverDirectory = "C:\\temp\\2.37";
 var options = new ChromeOptions();
 options.AddArgument("-no-sandbox");
 driver = new ChromeDriver(chromeDriverDirectory, options, 
 TimeSpan.FromMinutes(2));

Selenium version 3.11, ChromeDriver 2.37

Writing a new line to file in PHP (line feed)

Use PHP_EOL which outputs \r\n or \n depending on the OS.

PHP $_SERVER['HTTP_HOST'] vs. $_SERVER['SERVER_NAME'], am I understanding the man pages correctly?

Just an additional note - if the server runs on a port other than 80 (as might be common on a development/intranet machine) then HTTP_HOST contains the port, while SERVER_NAME does not.

$_SERVER['HTTP_HOST'] == 'localhost:8080'
$_SERVER['SERVER_NAME'] == 'localhost'

(At least that's what I've noticed in Apache port-based virtualhosts)

As Mike has noted below, HTTP_HOST does not contain :443 when running on HTTPS (unless you're running on a non-standard port, which I haven't tested).

Set markers for individual points on a line in Matplotlib

Hello There is an example:

import numpy as np
import matplotlib.pyplot as ptl

def grafica_seno_coseno():
    x = np.arange(-4,2*np.pi, 0.3)
    y = 2*np.sin(x)
    y2 = 3*np.cos(x)
    ptl.plot(x, y,  '-gD')
    ptl.plot(x, y2, '-rD')
    for xitem,yitem in np.nditer([x,y]):
        etiqueta = "{:.1f}".format(xitem)
        ptl.annotate(etiqueta, (xitem,yitem), textcoords="offset points",xytext=(0,10),ha="center")
    for xitem,y2item in np.nditer([x,y2]):
        etiqueta2 = "{:.1f}".format(xitem)
        ptl.annotate(etiqueta2, (xitem,y2item), textcoords="offset points",xytext=(0,10),ha="center")
    ptl.grid(True)
    return ptl.show()

Node.js Error: Cannot find module express

Check if you have installed express module. If not, use this command:

npm install express

and if your node_modules directory is in another place, set NODE_PATH envirnment variable:

set NODE_PATH=your\directory\to\node_modules;%NODE_PATH%

Copy Image from Remote Server Over HTTP

Since you've tagged your question 'php', I'll assume your running php on your server. Your best bet is if you control your own web server, then compile cURL into php. This will allow your web server to make requests to other web servers. This can be quite dangerous from a security point of view, so most basic web hosting providers won't have this option enabled.

Here's the php man page on using cURL. In the comments you can find an example which downloads and image file.

If you don't want to use libcurl, you could code something up using fsockopen. This is built into php (but may be disabled on your host), and can directly read and write to sockets. See Examples on the fsockopen man page.

What are Bearer Tokens and token_type in OAuth 2?

token_type is a parameter in Access Token generate call to Authorization server, which essentially represents how an access_token will be generated and presented for resource access calls. You provide token_type in the access token generation call to an authorization server.

If you choose Bearer (default on most implementation), an access_token is generated and sent back to you. Bearer can be simply understood as "give access to the bearer of this token." One valid token and no question asked. On the other hand, if you choose Mac and sign_type (default hmac-sha-1 on most implementation), the access token is generated and kept as secret in Key Manager as an attribute, and an encrypted secret is sent back as access_token.

Yes, you can use your own implementation of token_type, but that might not make much sense as developers will need to follow your process rather than standard implementations of OAuth.

How do you convert a byte array to a hexadecimal string in C?

Solution

Function btox converts arbitrary data *bb to an unterminated string *xp of n hexadecimal digits:

void btox(char *xp, const char *bb, int n) 
{
    const char xx[]= "0123456789ABCDEF";
    while (--n >= 0) xp[n] = xx[(bb[n>>1] >> ((1 - (n&1)) << 2)) & 0xF];
}

Example

#include <stdio.h>

typedef unsigned char uint8;

void main(void) 
{
    uint8 buf[] = {0, 1, 10, 11};
    int n = sizeof buf << 1;
    char hexstr[n + 1];

    btox(hexstr, buf, n);
    hexstr[n] = 0; /* Terminate! */
    printf("%s\n", hexstr);
}

Result: 00010A0B.

Live: Tio.run.

How do I cancel form submission in submit button onclick event?

Change your input to this:

<input type='submit' value='submit request' onclick='return btnClick();'>

And return false in your function

function btnClick() {
    if (!validData())
        return false;
}

Why isn't my Pandas 'apply' function referencing multiple columns working?

Seems you forgot the '' of your string.

In [43]: df['Value'] = df.apply(lambda row: my_test(row['a'], row['c']), axis=1)

In [44]: df
Out[44]:
                    a    b         c     Value
          0 -1.674308  foo  0.343801  0.044698
          1 -2.163236  bar -2.046438 -0.116798
          2 -0.199115  foo -0.458050 -0.199115
          3  0.918646  bar -0.007185 -0.001006
          4  1.336830  foo  0.534292  0.268245
          5  0.976844  bar -0.773630 -0.570417

BTW, in my opinion, following way is more elegant:

In [53]: def my_test2(row):
....:     return row['a'] % row['c']
....:     

In [54]: df['Value'] = df.apply(my_test2, axis=1)

Regex to validate JSON

Here my regexp for validate string:

^\"([^\"\\]*|\\(["\\\/bfnrt]{1}|u[a-f0-9]{4}))*\"$

Was written usign original syntax diagramm.

Mocking python function based on input arguments

If you "want to return a fixed value when the input parameter has a particular value", maybe you don't even need a mock and could use a dict along with its get method:

foo = {'input1': 'value1', 'input2': 'value2'}.get

foo('input1')  # value1
foo('input2')  # value2

This works well when your fake's output is a mapping of input. When it's a function of input I'd suggest using side_effect as per Amber's answer.

You can also use a combination of both if you want to preserve Mock's capabilities (assert_called_once, call_count etc):

self.mock.side_effect = {'input1': 'value1', 'input2': 'value2'}.get

How can I initialize an array without knowing it size?

You can't... an array's size is always fixed in Java. Typically instead of using an array, you'd use an implementation of List<T> here - usually ArrayList<T>, but with plenty of other alternatives available.

You can create an array from the list as a final step, of course - or just change the signature of the method to return a List<T> to start with.

what do <form action="#"> and <form method="post" action="#"> do?

The # tag lets you send your data to the same file. I see it as a three step process:

Query a DB to populate a from
Allow the user to change data in the form
Resubmit the data to the DB via the php script

With the method='#' you can do all of this in the same file.

After the submit query is executed the page will reload with the updated data from the DB.

Twitter Bootstrap tabs not working: when I click on them nothing happens

This solved it when none of the other examples did:

$('#myTab a').click(function (e) {
  e.preventDefault();
  $(this).tab('show');
});

Android - How to regenerate R class?

You can use Eclipse's "Restore from local history" to restore your old R file if it has been deleted. After that you possibly see what keeps Eclipse from building your files (I've seen other errors than before which really helped fixing the problem).

What does "TypeError 'xxx' object is not callable" means?

The other answers detail the reason for the error. A possible cause (to check) may be your class has a variable and method with the same name, which you then call. Python accesses the variable as a callable - with ().

e.g. Class A defines self.a and self.a():

>>> class A:
...     def __init__(self, val):
...         self.a = val
...     def a(self):
...         return self.a
...
>>> my_a = A(12)
>>> val = my_a.a()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'int' object is not callable
>>>

XDocument or XmlDocument

I believe that XDocument makes a lot more object creation calls. I suspect that for when you're handling a lot of XML documents, XMLDocument will be faster.

One place this happens is in managing scan data. Many scan tools output their data in XML (for obvious reasons). If you have to process a lot of these scan files, I think you'll have better performance with XMLDocument.

What are all the common ways to read a file in Ruby?

file_content = File.read('filename with extension');
puts file_content;

http://www.ruby-doc.org/core-1.9.3/IO.html#method-c-read

What exactly is std::atomic?

Each instantiation and full specialization of std::atomic<> represents a type that different threads can simultaneously operate on (their instances), without raising undefined behavior:

Objects of atomic types are the only C++ objects that are free from data races; that is, if one thread writes to an atomic object while another thread reads from it, the behavior is well-defined.

In addition, accesses to atomic objects may establish inter-thread synchronization and order non-atomic memory accesses as specified by std::memory_order.

std::atomic<> wraps operations that, in pre-C++ 11 times, had to be performed using (for example) interlocked functions with MSVC or atomic bultins in case of GCC.

Also, std::atomic<> gives you more control by allowing various memory orders that specify synchronization and ordering constraints. If you want to read more about C++ 11 atomics and memory model, these links may be useful:

Note that, for typical use cases, you would probably use overloaded arithmetic operators or another set of them:

std::atomic<long> value(0);
value++; //This is an atomic op
value += 5; //And so is this

Because operator syntax does not allow you to specify the memory order, these operations will be performed with std::memory_order_seq_cst, as this is the default order for all atomic operations in C++ 11. It guarantees sequential consistency (total global ordering) between all atomic operations.

In some cases, however, this may not be required (and nothing comes for free), so you may want to use more explicit form:

std::atomic<long> value {0};
value.fetch_add(1, std::memory_order_relaxed); // Atomic, but there are no synchronization or ordering constraints
value.fetch_add(5, std::memory_order_release); // Atomic, performs 'release' operation

Now, your example:

a = a + 12;

will not evaluate to a single atomic op: it will result in a.load() (which is atomic itself), then addition between this value and 12 and a.store() (also atomic) of final result. As I noted earlier, std::memory_order_seq_cst will be used here.

However, if you write a += 12, it will be an atomic operation (as I noted before) and is roughly equivalent to a.fetch_add(12, std::memory_order_seq_cst).

As for your comment:

A regular int has atomic loads and stores. Whats the point of wrapping it with atomic<>?

Your statement is only true for architectures that provide such guarantee of atomicity for stores and/or loads. There are architectures that do not do this. Also, it is usually required that operations must be performed on word-/dword-aligned address to be atomic std::atomic<> is something that is guaranteed to be atomic on every platform, without additional requirements. Moreover, it allows you to write code like this:

void* sharedData = nullptr;
std::atomic<int> ready_flag = 0;

// Thread 1
void produce()
{
    sharedData = generateData();
    ready_flag.store(1, std::memory_order_release);
}

// Thread 2
void consume()
{
    while (ready_flag.load(std::memory_order_acquire) == 0)
    {
        std::this_thread::yield();
    }

    assert(sharedData != nullptr); // will never trigger
    processData(sharedData);
}

Note that assertion condition will always be true (and thus, will never trigger), so you can always be sure that data is ready after while loop exits. That is because:

store() to the flag is performed after sharedData is set (we assume that generateData() always returns something useful, in particular, never returns NULL) and uses std::memory_order_release order:

memory_order_release

A store operation with this memory order performs the release operation: no reads or writes in the current thread can be reordered after this store. All writes in the current thread are visible in other threads that acquire the same atomic variable

sharedData is used after while loop exits, and thus after load() from flag will return a non-zero value. load() uses std::memory_order_acquire order:

std::memory_order_acquire

A load operation with this memory order performs the acquire operation on the affected memory location: no reads or writes in the current thread can be reordered before this load. All writes in other threads that release the same atomic variable are visible in the current thread.

This gives you precise control over the synchronization and allows you to explicitly specify how your code may/may not/will/will not behave. This would not be possible if only guarantee was the atomicity itself. Especially when it comes to very interesting sync models like the release-consume ordering.

How to terminate a Python script

I've just found out that when writing a multithreadded app, raise SystemExit and sys.exit() both kills only the running thread. On the other hand, os._exit() exits the whole process. This was discussed in "Why does sys.exit() not exit when called inside a thread in Python?".

The example below has 2 threads. Kenny and Cartman. Cartman is supposed to live forever, but Kenny is called recursively and should die after 3 seconds. (recursive calling is not the best way, but I had other reasons)

If we also want Cartman to die when Kenny dies, Kenny should go away with os._exit, otherwise, only Kenny will die and Cartman will live forever.

import threading
import time
import sys
import os

def kenny(num=0):
    if num > 3:
        # print("Kenny dies now...")
        # raise SystemExit #Kenny will die, but Cartman will live forever
        # sys.exit(1) #Same as above

        print("Kenny dies and also kills Cartman!")
        os._exit(1)
    while True:
        print("Kenny lives: {0}".format(num))
        time.sleep(1)
        num += 1
        kenny(num)

def cartman():
    i = 0
    while True:
        print("Cartman lives: {0}".format(i))
        i += 1
        time.sleep(1)

if __name__ == '__main__':
    daemon_kenny = threading.Thread(name='kenny', target=kenny)
    daemon_cartman = threading.Thread(name='cartman', target=cartman)
    daemon_kenny.setDaemon(True)
    daemon_cartman.setDaemon(True)

    daemon_kenny.start()
    daemon_cartman.start()
    daemon_kenny.join()
    daemon_cartman.join()

SQL Server 2008 Insert with WHILE LOOP

First of all I'd like to say that I 100% agree with John Saunders that you must avoid loops in SQL in most cases especially in production.

But occasionally as a one time thing to populate a table with a hundred records for testing purposes IMHO it's just OK to indulge yourself to use a loop.

For example in your case to populate your table with records with hospital ids between 16 and 100 and make emails and descriptions distinct you could've used

CREATE PROCEDURE populateHospitals
AS
DECLARE @hid INT;
SET @hid=16;
WHILE @hid < 100
BEGIN 
    INSERT hospitals ([Hospital ID], Email, Description) 
    VALUES(@hid, 'user' + LTRIM(STR(@hid)) + '@mail.com', 'Sample Description' + LTRIM(STR(@hid))); 
    SET @hid = @hid + 1;
END

And result would be

ID   Hospital ID Email            Description          
---- ----------- ---------------- ---------------------
1    16          [email protected]  Sample Description16 
2    17          [email protected]  Sample Description17 
...                                                    
84   99          [email protected]  Sample Description99

How to save the output of a console.log(object) to a file?

There is an open-source javascript plugin that does just that - debugout.js

Debugout.js records and save console.logs so your application can access them. Full disclosure, I wrote it. It formats different types appropriately, can handle nested objects and arrays, and can optionally put a timestamp next to each log. It also toggles live-logging in one place.

add created_at and updated_at fields to mongoose schemas

As of Mongoose 4.0 you can now set a timestamps option on the Schema to have Mongoose handle this for you:

var thingSchema = new Schema({..}, { timestamps: true });

You can change the name of the fields used like so:

var thingSchema = new Schema({..}, { timestamps: { createdAt: 'created_at' } });

http://mongoosejs.com/docs/guide.html#timestamps

Android ListView headers

You probably are looking for an ExpandableListView which has headers (groups) to separate items (childs).

Nice tutorial on the subject: here.

Override standard close (X) button in a Windows Form

One thing these answers lack, and which newbies are probably looking for, is that while it's nice to have an event:

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
    // do something
}

It's not going to do anything at all unless you register the event. Put this in the class constructor:

this.FormClosing += Form1_FormClosing;

Cannot find the declaration of element 'beans'

Found it on another thread that solved my problem... was using an internet connection less network.

In that case copy the xsd files from the url and place it next to the beans.xml file and change the xsi:schemaLocation as under:

 <beans xmlns="http://www.springframework.org/schema/beans" 
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.springframework.org/schema/beans 
spring-beans-3.1.xsd">

Set value of hidden field in a form using jQuery's ".val()" doesn't work

Simply use syntax below get and set

GET

//Script 
var a = $("#selectIndex").val();

here a variable will hold the value of hiddenfield(selectindex)

Server side

<asp:HiddenField ID="selectIndex" runat="server" Value="0" />

SET

var a =10;
$("#selectIndex").val(a);

SQL Server stored procedure Nullable parameter

You can/should set your parameter to value to DBNull.Value;

if (variable == "")
{
     cmd.Parameters.Add("@Param", SqlDbType.VarChar, 500).Value = DBNull.Value;
}
else
{
     cmd.Parameters.Add("@Param", SqlDbType.VarChar, 500).Value = variable;
}

Or you can leave your server side set to null and not pass the param at all.

Loop through all the rows of a temp table and call a stored procedure for each row

You always don't need a cursor for this. You can do it with a while loop. You should avoid cursors whenever possible. While loop is faster than cursors.

Is it possible to put CSS @media rules inline?

Hey I just wrote it.

Now you can use <div style="color: red; @media (max-width: 200px) { color: green }"> or so.

Enjoy.

Error handling with PHPMailer

This one works fine

use try { as above

use Catch as above but comment out the echo lines
} catch (phpmailerException $e) { 
//echo $e->errorMessage(); //Pretty error messages from PHPMailer
} catch (Exception $e) {   
//echo $e->getMessage(); //Boring error messages from anything else!
}

Then add this

if ($e) {
//enter yor error message or redirect the user
} else {
//do something else 
}

How to stop text from taking up more than 1 line?

Sometimes using   instead of spaces will work. Clearly it has drawbacks, though.

Loop and get key/value pair for JSON array using jQuery

Parse the JSON string and you can loop through the keys.

_x000D_

var resultJSON = '{"FirstName":"John","LastName":"Doe","Email":"[email protected]","Phone":"123 dead drive"}';_x000D_
var data = JSON.parse(resultJSON);_x000D_
_x000D_
for (var key in data)_x000D_
{_x000D_
    //console.log(key + ' : ' + data[key]);_x000D_
    alert(key + ' --> ' + data[key]);_x000D_
}

_x000D_

CSS Grid Layout not working in IE11 even with prefixes

The answer has been given by Faisal Khurshid and Michael_B already.
This is just an attempt to make a possible solution more obvious.

For IE11 and below you need to enable grid's older specification in the parent div e.g. body or like here "grid" like so:

.grid-parent{display:-ms-grid;}

then define the amount and width of the columns and rows like e.g. so:

.grid-parent{
  -ms-grid-columns: 1fr 3fr;
  -ms-grid-rows: 4fr;
}

finally you need to explicitly tell the browser where your element (item) should be placed in e.g. like so:

.grid-item-1{
  -ms-grid-column: 1;
  -ms-grid-row: 1;
}

.grid-item-2{
  -ms-grid-column: 2;
  -ms-grid-row: 1;
}

"Insufficient Storage Available" even there is lot of free space in device memory

I had the same issue on Galaxy S4 (i9505) on stock ROM (4.2.2 ME2). I had free space like this: 473 MB on /data, 344 MB on /system, 2 GB on /cache. I was getting the free spate error on any download from Play Store (small app, 2.5 MB), I checked LogCat, it said "Cancel download of ABC because insufficient free space".

Then I freed up some space on /data, 600 MB free, and now it's working fine, apps download and install ;). So it seems like this ROM needs a little more free space to work OK...

What is a Memory Heap?

A memory heap is a common structure for holding dynamically allocated memory. See Dynamic_memory_allocation on wikipedia.

There are other structures, like pools, stacks and piles.

How to create a collapsing tree table in html/css/js?

SlickGrid has this functionality, see the tree demo.

If you want to build your own, here is an example (jsFiddle demo): Build your table with a data-depth attribute to indicate the depth of the item in the tree (the levelX CSS classes are just for styling indentation):

<table id="mytable">
    <tr data-depth="0" class="collapse level0">
        <td><span class="toggle collapse"></span>Item 1</td>
        <td>123</td>
    </tr>
    <tr data-depth="1" class="collapse level1">
        <td><span class="toggle"></span>Item 2</td>
        <td>123</td>
    </tr>
</table>

Then when a toggle link is clicked, use Javascript to hide all <tr> elements until a <tr> of equal or less depth is found (excluding those already collapsed):

$(function() {
    $('#mytable').on('click', '.toggle', function () {
        //Gets all <tr>'s  of greater depth below element in the table
        var findChildren = function (tr) {
            var depth = tr.data('depth');
            return tr.nextUntil($('tr').filter(function () {
                return $(this).data('depth') <= depth;
            }));
        };

        var el = $(this);
        var tr = el.closest('tr'); //Get <tr> parent of toggle button
        var children = findChildren(tr);

        //Remove already collapsed nodes from children so that we don't
        //make them visible. 
        //(Confused? Remove this code and close Item 2, close Item 1 
        //then open Item 1 again, then you will understand)
        var subnodes = children.filter('.expand');
        subnodes.each(function () {
            var subnode = $(this);
            var subnodeChildren = findChildren(subnode);
            children = children.not(subnodeChildren);
        });

        //Change icon and hide/show children
        if (tr.hasClass('collapse')) {
            tr.removeClass('collapse').addClass('expand');
            children.hide();
        } else {
            tr.removeClass('expand').addClass('collapse');
            children.show();
        }
        return children;
    });
});

Add dynamic key, value pairs to JavaScript array or hash table

What is pipe() function in Angular

Don't get confused with the concepts of Angular and RxJS

We have pipes concept in Angular and pipe() function in RxJS.

1) Pipes in Angular: A pipe takes in data as input and transforms it to the desired output
https://angular.io/guide/pipes

2) pipe() function in RxJS: You can use pipes to link operators together. Pipes let you combine multiple functions into a single function.

The pipe() function takes as its arguments the functions you want to combine, and returns a new function that, when executed, runs the composed functions in sequence.
https://angular.io/guide/rx-library (search for pipes in this URL, you can find the same)

So according to your question, you are referring pipe() function in RxJS

Convert HTML string to image

Try the following:

using System;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;

class Program
{
    static void Main(string[] args)
    {
        var source =  @"
        <!DOCTYPE html>
        <html>
            <body>
                <p>An image from W3Schools:</p>
                <img 
                    src=""http://www.w3schools.com/images/w3schools_green.jpg"" 
                    alt=""W3Schools.com"" 
                    width=""104"" 
                    height=""142"">
            </body>
        </html>";
        StartBrowser(source);
        Console.ReadLine();
    }

    private static void StartBrowser(string source)
    {
        var th = new Thread(() =>
        {
            var webBrowser = new WebBrowser();
            webBrowser.ScrollBarsEnabled = false;
            webBrowser.DocumentCompleted +=
                webBrowser_DocumentCompleted;
            webBrowser.DocumentText = source;
            Application.Run();
        });
        th.SetApartmentState(ApartmentState.STA);
        th.Start();
    }

    static void 
        webBrowser_DocumentCompleted(
        object sender, 
        WebBrowserDocumentCompletedEventArgs e)
    {
        var webBrowser = (WebBrowser)sender;
        using (Bitmap bitmap = 
            new Bitmap(
                webBrowser.Width, 
                webBrowser.Height))
        {
            webBrowser
                .DrawToBitmap(
                bitmap, 
                new System.Drawing
                    .Rectangle(0, 0, bitmap.Width, bitmap.Height));
            bitmap.Save(@"filename.jpg", 
                System.Drawing.Imaging.ImageFormat.Jpeg);
        }
    }
}

Note: Credits should go to Hans Passant for his excellent answer on the question WebBrowser Control in a new thread which inspired this solution.

How to avoid mysql 'Deadlock found when trying to get lock; try restarting transaction'

It is likely that the delete statement will affect a large fraction of the total rows in the table. Eventually this might lead to a table lock being acquired when deleting. Holding on to a lock (in this case row- or page locks) and acquiring more locks is always a deadlock risk. However I can't explain why the insert statement leads to a lock escalation - it might have to do with page splitting/adding, but someone knowing MySQL better will have to fill in there.

For a start it can be worth trying to explicitly acquire a table lock right away for the delete statement. See LOCK TABLES and Table locking issues.

Django URLs TypeError: view must be a callable or a list/tuple in the case of include()

Django 1.10 no longer allows you to specify views as a string (e.g. 'myapp.views.home') in your URL patterns.

The solution is to update your urls.py to include the view callable. This means that you have to import the view in your urls.py. If your URL patterns don't have names, then now is a good time to add one, because reversing with the dotted python path no longer works.

from django.conf.urls import include, url

from django.contrib.auth.views import login
from myapp.views import home, contact

urlpatterns = [
    url(r'^$', home, name='home'),
    url(r'^contact/$', contact, name='contact'),
    url(r'^login/$', login, name='login'),
]

If there are many views, then importing them individually can be inconvenient. An alternative is to import the views module from your app.

from django.conf.urls import include, url

from django.contrib.auth import views as auth_views
from myapp import views as myapp_views

urlpatterns = [
    url(r'^$', myapp_views.home, name='home'),
    url(r'^contact/$', myapp_views.contact, name='contact'),
    url(r'^login/$', auth_views.login, name='login'),
]

Note that we have used as myapp_views and as auth_views, which allows us to import the views.py from multiple apps without them clashing.

See the Django URL dispatcher docs for more information about urlpatterns.

Setting selected values for ng-options bound select elements

Using ng-selected for selected value. I Have successfully implemented code in AngularJS v1.3.2

_x000D_

<select ng-model="objBillingAddress.StateId"  >_x000D_
   <option data-ng-repeat="c in States" value="{{c.StateId}}" ng-selected="objBillingAddress.BillingStateId==c.StateId">{{c.StateName}}</option>_x000D_
                                                </select>

_x000D_

How to create a simple checkbox in iOS?

On iOS there is the switch UI component instead of a checkbox, look into the UISwitch class. The property on (boolean) can be used to determine the state of the slider and about the saving of its state: That depends on how you save your other stuff already, its just saving a boolean value.

Javascript to display the current date and time

Get the data you need and combine it in the String;

getDate(): Returns the date
getMonth(): Returns the month
getFullYear(): Returns the year
getHours();
getMinutes();

Check out : Working With Dates

jQuery select box validation

http://docs.jquery.com/Plugins/Validation/Methods/required

edit the code for 'select' as below for checking for a 0 or null value selection from select list

case 'select':
var options = $("option:selected", element);
return (options[0].value != 0 && options.length > 0 && options[0].value != '') && (element.type == "select-multiple" || ($.browser.msie && !(options[0].attributes['value'].specified) ? options[0].text : options[0].value).length > 0);

How to rollback just one step using rake db:migrate

Best way is running Particular migration again by using down or up(in rails 4. It's change)

rails db:migrate:up VERSION=timestamp

Now how you get the timestamp. Go to this path

/db/migrate

Identify migration file you want to revert.pick the timestamp from that file name.

How do I write a for loop in bash

Bash 3.0+ can use this syntax:

for i in {1..10} ; do ... ; done

..which avoids spawning an external program to expand the sequence (such as seq 1 10).

Of course, this has the same problem as the for(()) solution, being tied to bash and even a particular version (if this matters to you).

How to pass prepareForSegue: an object

Simply grab a reference to the target view controller in prepareForSegue: method and pass any objects you need to there. Here's an example...

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Make sure your segue name in storyboard is the same as this line
    if ([[segue identifier] isEqualToString:@"YOUR_SEGUE_NAME_HERE"])
    {
        // Get reference to the destination view controller
        YourViewController *vc = [segue destinationViewController];

        // Pass any objects to the view controller here, like...
        [vc setMyObjectHere:object];
    }
}

REVISION: You can also use performSegueWithIdentifier:sender: method to activate the transition to a new view based on a selection or button press.

For instance, consider I had two view controllers. The first contains three buttons and the second needs to know which of those buttons has been pressed before the transition. You could wire the buttons up to an IBAction in your code which uses performSegueWithIdentifier: method, like this...

// When any of my buttons are pressed, push the next view
- (IBAction)buttonPressed:(id)sender
{
    [self performSegueWithIdentifier:@"MySegue" sender:sender];
}

// This will get called too before the view appears
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"MySegue"]) {

        // Get destination view
        SecondView *vc = [segue destinationViewController];

        // Get button tag number (or do whatever you need to do here, based on your object
        NSInteger tagIndex = [(UIButton *)sender tag];

        // Pass the information to your destination view
        [vc setSelectedButton:tagIndex];
    }
}

EDIT: The demo application I originally attached is now six years old, so I've removed it to avoid any confusion.

If two cells match, return value from third

=IF(ISNA(INDEX(B:B,MATCH(C2,A:A,0))),"",INDEX(B:B,MATCH(C2,A:A,0)))

Will return the answer you want and also remove the #N/A result that would appear if you couldn't find a result due to it not appearing in your lookup list.

Ross

VT-x is disabled in the BIOS for both all CPU modes (VERR_VMX_MSR_ALL_VMX_DISABLED)

enable PAE/NX in virtualbox network config

How can I catch all the exceptions that will be thrown through reading and writing a file?

Catch the base exception 'Exception'

   try { 
         //some code
   } catch (Exception e) {
        //catches exception and all subclasses 
   }

Clone contents of a GitHub repository (without the folder itself)

You can specify the destination directory as second parameter of the git clone command, so you can do:

git clone <remote> .

This will clone the repository directly in the current local directory.

How to convert an int to string in C?

After having looked at various versions of itoa for gcc, the most flexible version I have found that is capable of handling conversions to binary, decimal and hexadecimal, both positive and negative is the fourth version found at http://www.strudel.org.uk/itoa/. While sprintf/snprintf have advantages, they will not handle negative numbers for anything other than decimal conversion. Since the link above is either off-line or no longer active, I've included their 4th version below:

/**
 * C++ version 0.4 char* style "itoa":
 * Written by Lukás Chmela
 * Released under GPLv3.
 */
char* itoa(int value, char* result, int base) {
    // check that the base if valid
    if (base < 2 || base > 36) { *result = '\0'; return result; }

    char* ptr = result, *ptr1 = result, tmp_char;
    int tmp_value;

    do {
        tmp_value = value;
        value /= base;
        *ptr++ = "zyxwvutsrqponmlkjihgfedcba9876543210123456789abcdefghijklmnopqrstuvwxyz" [35 + (tmp_value - value * base)];
    } while ( value );

    // Apply negative sign
    if (tmp_value < 0) *ptr++ = '-';
    *ptr-- = '\0';
    while(ptr1 < ptr) {
        tmp_char = *ptr;
        *ptr--= *ptr1;
        *ptr1++ = tmp_char;
    }
    return result;
}

Send email using java

You need a SMTP server for sending mails. There are servers you can install locally on your own pc, or you can use one of the many online servers. One of the more known servers is Google's:

I just successfully tested the allowed Google SMTP configurations using the first example from Simple Java Mail:

    final Email email = EmailBuilder.startingBlank()
        .from("lollypop", "[email protected]")
        .to("C.Cane", "[email protected]")
        .withPlainText("We should meet up!")
        .withHTMLText("<b>We should meet up!</b>")
        .withSubject("hey");

    // starting 5.0.0 do the following using the MailerBuilder instead...
    new Mailer("smtp.gmail.com", 25, "your user", "your password", TransportStrategy.SMTP_TLS).sendMail(email);
    new Mailer("smtp.gmail.com", 587, "your user", "your password", TransportStrategy.SMTP_TLS).sendMail(email);
    new Mailer("smtp.gmail.com", 465, "your user", "your password", TransportStrategy.SMTP_SSL).sendMail(email);

Notice the various ports and transport strategies (which handle all the necessary properties for you).

Curiously, Google require TLS on port 25 as well, even though Google's instructions say otherwise.

Find the 2nd largest element in an array with minimum number of comparisons

Assuming space is irrelevant, this is the smallest I could get it. It requires 2*n comparisons in worst case, and n comparisons in best case:

arr = [ 0, 12, 13, 4, 5, 32, 8 ]
max = [ -1, -1 ]

for i in range(len(arr)):
     if( arr[i] > max[0] ):
        max.insert(0,arr[i])
     elif( arr[i] > max[1] ):
        max.insert(1,arr[i])

print max[1]

How do you normalize a file path in Bash?

Use the readlink utility from the coreutils package.

MY_PATH=$(readlink -f "$0")

What's the location of the JavaFX runtime JAR file, jfxrt.jar, on Linux?

Mine were located here on Ubuntu 18.04 when I installed JavaFX using apt install openjfx (as noted already by @jewelsea above)

/usr/share/java/openjfx/jre/lib/ext/jfxrt.jar
/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/ext/jfxrt.jar

Redirect to new Page in AngularJS using $location

$location won't help you with external URLs, use the $window service instead:

$window.location.href = 'http://www.google.com';

Note that you could use the window object, but it is bad practice since $window is easily mockable whereas window is not.

Programs & Examples On #Textboxextender

bundle install returns "Could not locate Gemfile"

how to set default main class in java?

Where is android_sdk_root? and how do I set it.?

How does one target IE7 and IE8 with valid CSS?

Python and pip, list all versions of a package that's available?

Random alpha-numeric string in JavaScript?

"did you run git update-server-info" error on a Github repository

How to pass IEnumerable list to controller in MVC including checkbox state?

Why use multiple columns as primary keys (composite primary key)

Angularjs simple file download causes router to redirect

Removing elements by class name?

byte[] to hex string

$(document).on("click"... not working?

How to change XML Attribute

How to use ArrayList's get() method

Develop Android app using C#

How can I format decimal property to currency?

Java ArrayList for integers

Is it possible to iterate through JSONArray?

remote: repository not found fatal: not found

remove item from stored array in angular 2

How do you replace all the occurrences of a certain character in a string?

Passing parameter to controller from route in laravel

Why aren't programs written in Assembly more often?

How can I parse a JSON file with PHP?

How to play only the audio of a Youtube video using HTML 5?

Illegal Escape Character "\"

Spring: Why do we autowire the interface and not the implemented class?

How can I delete using INNER JOIN with SQL Server?

C compile error: Id returned 1 exit status

Sqlite convert string to date

Best way to compare two complex objects

How to create a drop-down list?

jQuery won't parse my JSON from AJAX query

Move entire line up and down in Vim

How can I convert a string with dot and comma into a float in Python

Zero-pad digits in string

Static Block in Java

What is the newline character in the C language: \r or \n?

JQuery get all elements by class name

Why do I get TypeError: can't multiply sequence by non-int of type 'float'?

Return single column from a multi-dimensional array

Difference between null and empty string

How to turn a String into a JavaScript function call?

How to verify an XPath expression in Chrome Developers tool or Firefox's Firebug?

Chrome

Firefox (since version 75)

Firefox (prior version 75)

Firefox (prior version 49)

Java format yyyy-MM-dd'T'HH:mm:ss.SSSz to yyyy-mm-dd HH:mm:ss

Excel plot time series frequency with continuous xaxis

What is the difference between Python and IPython?

In PowerShell, how do I define a function in a file and call it from the PowerShell commandline?

Extract Data from PDF and Add to Worksheet

Questions every good Java/Java EE Developer should be able to answer?

error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘{’ token

"Char cannot be dereferenced" error

WPF Databinding: How do I access the "parent" data context?

How to open existing project in Eclipse

Properly Handling Errors in VBA (Excel)

Exception thrown inside catch block - will it be caught again?

How to close activity and go back to previous activity in android

installing cPickle with python 3.5

how to access downloads folder in android?

List all files and directories in a directory + subdirectories

PHP MySQL Google Chart JSON - Complete Example

javascript variable reference/alias

How to get JavaScript caller function line number? How to get JavaScript caller source URL?

Collections sort(List<T>,Comparator<? super T>) method example

Windows command to get service status?

Remove the last character in a string in T-SQL?

CSS Change List Item Background Color with Class

Output a NULL cell value in Excel

Readably print out a python dict() sorted by key

How to view an HTML file in the browser with Visual Studio Code

How do I count occurrence of duplicate items in array

Image change every 30 seconds - loop

How to clear/delete the contents of a Tkinter Text widget?

Find oldest/youngest datetime object in a list

error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘attribute’ before ‘{’ token