SyntaxFix

Programs & Examples On #Cvs2svn

cvs2svn is a tool for migrating a CVS repository to Subversion, git, or Bazaar.

How to copy a char array in C?

I recommend to use memcpy() for copying data. Also if we assign a buffer to another as array2 = array1 , both array have same memory and any change in the arrary1 deflects in array2 too. But we use memcpy, both buffer have different array. I recommend memcpy() because strcpy and related function do not copy NULL character.

How do I configure php to enable pdo and include mysqli on CentOS?

You might just have to install the packages.

yum install php-pdo php-mysqli

After they're installed, restart Apache.

httpd restart

or

apachectl restart

commandButton/commandLink/ajax action/listener method not invoked or input value not set/updated

I fixed my problem with placing the:

<h:commandButton class="btn btn-danger" value = "Remove" action="#{deleteEmployeeBean.delete}"></h:commandButton>

In:

<h:form>
     <h:commandButton class="btn btn-danger" value = "Remove" action="#{deleteEmployeeBean.delete}"></h:commandButton>
</h:form>

Creating a URL in the controller .NET MVC

Another way to create an absolute URL to an action:

var relativeUrl = Url.Action("MyAction");  //..or one of the other .Action() overloads
var currentUrl = Request.Url;

var absoluteUrl = new System.Uri(currentUrl, relativeUrl);

Android requires compiler compliance level 5.0 or 6.0. Found '1.7' instead. Please use Android Tools > Fix Project Properties

Doing Project -> Clean... fixed it for me.

My eclipse had stopped working so I cleaned workspace directory and after I run eclipse when I import the project I had this problem. Other solutions suggested here didn't work.

Create a copy of a table within the same database DB2

Two steps works fine:

create table bu_x as (select a,b,c,d from x ) WITH no data;

insert into bu_x (a,b,c,d) select select a,b,c,d from x ;

Forbidden You don't have permission to access /wp-login.php on this server

I had this same problem, and after temporarily deleting all my .htaccess files, then trying to modify them as suggested, and making sure all my files and folder permissions were set to 777, I still couldn't get it to work. I don't know why I couldn't access the file, but I was able to create a new file and access it no problem. So what I did was create a new file in /wp-admin/ called temp.php and pasted all the code from install.php into it. This allowed me to access the file. The only other thing I had to do was edit the code so that the form submitted to temp.php instead of install.php. After that, I could finish the install and everything worked.

<form id="setup" method="post" action="temp.php?step=2">

How to get a reference to an iframe's window object inside iframe's onload handler created from parent window

You're declaring everything in the parent page. So the references to window and document are to the parent page's. If you want to do stuff to the iframe's, use iframe || iframe.contentWindow to access its window, and iframe.contentDocument || iframe.contentWindow.document to access its document.

There's a word for what's happening, possibly "lexical scope": What is lexical scope?

The only context of a scope is this. And in your example, the owner of the method is doc, which is the iframe's document. Other than that, anything that's accessed in this function that uses known objects are the parent's (if not declared in the function). It would be a different story if the function were declared in a different place, but it's declared in the parent page.

This is how I would write it:

(function () {
  var dom, win, doc, where, iframe;

  iframe = document.createElement('iframe');
  iframe.src = "javascript:false";

  where = document.getElementsByTagName('script')[0];
  where.parentNode.insertBefore(iframe, where);

  win = iframe.contentWindow || iframe;
  doc = iframe.contentDocument || iframe.contentWindow.document;

  doc.open();
  doc._l = (function (w, d) {
    return function () {
      w.vanishing_global = new Date().getTime();

      var js = d.createElement("script");
      js.src = 'test-vanishing-global.js?' + w.vanishing_global;

      w.name = "foobar";
      d.foobar = "foobar:" + Math.random();
      d.foobar = "barfoo:" + Math.random();
      d.body.appendChild(js);
    };
  })(win, doc);
  doc.write('<body onload="document._l();"></body>');
  doc.close();
})();

The aliasing of win and doc as w and d aren't necessary, it just might make it less confusing because of the misunderstanding of scopes. This way, they are parameters and you have to reference them to access the iframe's stuff. If you want to access the parent's, you still use window and document.

I'm not sure what the implications are of adding methods to a document (doc in this case), but it might make more sense to set the _l method on win. That way, things can be run without a prefix...such as <body onload="_l();"></body>

How to remove element from an array in JavaScript?

Typescript solution that does not mutate original array

function removeElementAtIndex<T>(input: T[], index: number) {
  return input.slice(0, index).concat(input.slice(index + 1));
}

Extracting the last n characters from a string in R

Use stri_sub function from stringi package. To get substring from the end, use negative numbers. Look below for the examples:

stri_sub("abcde",1,3)
[1] "abc"
stri_sub("abcde",1,1)
[1] "a"
stri_sub("abcde",-3,-1)
[1] "cde"

You can install this package from github: https://github.com/Rexamine/stringi

It is available on CRAN now, simply type

install.packages("stringi")

to install this package.

jquery animate background position

 
function getBackgroundPositionX(sel) {
    pos = $(sel).css('backgroundPosition').split(' ');
    return parseFloat(pos[0].substring(0, pos[0].length-2));
}

This returns [x] value. Length of number has no matter. Could be e.g. 9999 or 0.

Disable password authentication for SSH

Run

service ssh restart

instead of 

/etc/init.d/ssh restart

This might work.

Adding values to Arraylist

There's a faster and easy way in Java 9 without involving much of code: Using Collection Factory methods:

List<String> list = List.of("first", "second", "third");

How can I use the python HTMLParser library to extract data from a specific div tag?

Have You tried BeautifulSoup ? 

from bs4 import BeautifulSoup
soup = BeautifulSoup('<div id="remository">20</div>')
tag=soup.div
print(tag.string)

This gives You 20 on output.

How can I prevent the TypeError: list indices must be integers, not tuple when copying a python list to a numpy array?

np.append needs the array as the first argument and the list you want to append as the second:

mean_data = np.append(mean_data, [ur, ua, np.mean(data[samepoints,-1])])

How to properly exit a C# application?

This will work from anywhere, inside Form(), Form_Load(), or any event handler. I posted before, but I don't see it now?!?

public void exit(int exitCode)
{
    if (System.Windows.Forms.Application.MessageLoop)
    {
       // Use this since we are in a running Form
       System.Windows.Forms.Application.Exit();
       System.Environment.Exit(exitCode);
    }
    else
    {
       // Form ended or never .Run
       System.Environment.Exit(exitCode);
    }
} //* end exit()

Kotlin: How to get and set a text to TextView in Android using Kotlin?

 
  <TextView
        android:id="@+id/usage"
        android:layout_marginTop="220dip"
        android:layout_marginLeft="45dip"
        android:layout_marginRight="15dip"
        android:typeface="serif"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Google "
        android:textColor="#030900"/>


usage.text="hello world"

Android SDK manager won't open

I tried almost all the solutions provided here. But nothing worked out. And finally, I downloaded tools(tools_r25.2.3-windows.zip) from the below link and replaced the tools sub-folder in the sdk folder. It started working.

https://developer.android.com/studio/index.html#downloads

Sharing this as an information though it's an old thread.

How to tag docker image with docker-compose

If you specify image as well as build, then Compose names the built image with the webapp and optional tag specified in image:

build: ./dir
image: webapp:tag

This results in an image named webapp and tagged tag, built from ./dir.

https://docs.docker.com/compose/compose-file/#build

Extracting specific columns in numpy array

if you want to extract only some columns:

idx_IN_columns = [1, 9]
extractedData = data[:,idx_IN_columns]

if you want to exclude specific columns:

idx_OUT_columns = [1, 9]
idx_IN_columns = [i for i in xrange(np.shape(data)[1]) if i not in idx_OUT_columns]
extractedData = data[:,idx_IN_columns]

Windows- Pyinstaller Error "failed to execute script " When App Clicked

In my case i have a main.py that have dependencies with other files. After I build that app with py installer using this command:

pyinstaller --onefile --windowed main.py

I got the main.exe inside dist folder. I double clicked on this file, and I raised the error mentioned above. To fix this, I just copy the main.exe from dist directory to previous directory, which is the root directory of my main.py and the dependency files, and I got no error after run the main.exe.

Find a pair of elements from an array whose sum equals a given number

I can do it in O(n). Let me know when you want the answer. Note it involves simply traversing the array once with no sorting, etc... I should mention too that it exploits commutativity of addition and doesn't use hashes but wastes memory.

using System; using System.Collections.Generic;

/* An O(n) approach exists by using a lookup table. The approach is to store the value in a "bin" that can easily be looked up(e.g., O(1)) if it is a candidate for an appropriate sum.

e.g.,

for each a[k] in the array we simply put the it in another array at the location x - a[k].

Suppose we have [0, 1, 5, 3, 6, 9, 8, 7] and x = 9

We create a new array,

indexes value

9 - 0 = 9     0
9 - 1 = 8     1
9 - 5 = 4     5
9 - 3 = 6     3
9 - 6 = 3     6
9 - 9 = 0     9
9 - 8 = 1     8
9 - 7 = 2     7

THEN the only values that matter are the ones who have an index into the new table.

So, say when we reach 9 or equal we see if our new array has the index 9 - 9 = 0. Since it does we know that all the values it contains will add to 9. (note in this cause it's obvious there is only 1 possible one but it might have multiple index values in it which we need to store).

So effectively what we end up doing is only having to move through the array once. Because addition is commutative we will end up with all the possible results.

For example, when we get to 6 we get the index into our new table as 9 - 6 = 3. Since the table contains that index value we know the values.

This is essentially trading off speed for memory. */

namespace sum
{
    class Program
    {
        static void Main(string[] args)
        {
            int num = 25;
            int X = 10;
            var arr = new List<int>();
            for(int i = 0; i <= num; i++) arr.Add((new Random((int)(DateTime.Now.Ticks + i*num))).Next(0, num*2));
            Console.Write("["); for (int i = 0; i < num - 1; i++) Console.Write(arr[i] + ", "); Console.WriteLine(arr[arr.Count-1] + "] - " + X);
            var arrbrute = new List<Tuple<int,int>>();
            var arrfast = new List<Tuple<int,int>>();

            for(int i = 0; i < num; i++)
            for(int j = i+1; j < num; j++)
                if (arr[i] + arr[j] == X) 
                    arrbrute.Add(new Tuple<int, int>(arr[i], arr[j]));




            int M = 500;
            var lookup = new List<List<int>>();
            for(int i = 0; i < 1000; i++) lookup.Add(new List<int>());
            for(int i = 0; i < num; i++)        
            {
                // Check and see if we have any "matches"
                if (lookup[M + X - arr[i]].Count != 0)
                {
                    foreach(var j in lookup[M + X - arr[i]])
                    arrfast.Add(new Tuple<int, int>(arr[i], arr[j])); 
                }

                lookup[M + arr[i]].Add(i);

            }

            for(int i = 0; i < arrbrute.Count; i++)
                Console.WriteLine(arrbrute[i].Item1 + " + " + arrbrute[i].Item2 + " = " + X);
            Console.WriteLine("---------");
            for(int i = 0; i < arrfast.Count; i++)
                Console.WriteLine(arrfast[i].Item1 + " + " + arrfast[i].Item2 + " = " + X);

            Console.ReadKey();
        }
    }
}

Python FileNotFound

try block should be around open. Not around prompt.

while True:
    prompt = input("\n Hello to Sudoku valitator,"
    "\n \n Please type in the path to your file and press 'Enter': ")
    try:
        sudoku = open(prompt, 'r').readlines()
    except FileNotFoundError:
        print("Wrong file or file path")
    else:
        break

Remove everything after a certain character

Worked for me:

      var first = regexLabelOut.replace(/,.*/g, "");

How to make jQuery UI nav menu horizontal?

I just been for 3 days looking for a jquery UI and CSS solution, I merge some code I saw, fix a little, and finally (along the other codes) I could make it work!

http://jsfiddle.net/Moatilliatta/97m6ty1a/

<ul id="nav" class="testnav">
    <li><a class="clk" href="#">Item 1</a></li>
    <li><a class="clk" href="#">Item 2</a></li>
    <li><a class="clk" href="#">Item 3</a>
        <ul class="sub-menu">
            <li><a href="#">Item 3-1</a>
                <ul class="sub-menu">
                    <li><a href="#">Item 3-11</a></li>
                    <li><a href="#">Item 3-12</a>
                        <ul>
                            <li><a href="#">Item 3-111</a></li>                         
                            <li><a href="#">Item 3-112</a>
                                <ul>
                                    <li><a href="#">Item 3-1111</a></li>                            
                                    <li><a href="#">Item 3-1112</a></li>                            
                                    <li><a href="#">Item 3-1113</a>
                                        <ul>
                                            <li><a href="#">Item 3-11131</a></li>                           
                                            <li><a href="#">Item 3-11132</a></li>                           
                                        </ul>
                                    </li>                           
                                </ul>
                            </li>
                            <li><a href="#">Item 3-113</a></li>
                        </ul>
                    </li>
                    <li><a href="#">Item 3-13</a></li>
                </ul>
            </li>
            <li><a href="#">Item 3-2</a>
                <ul>
                    <li><a href="#."> Item 3-21 </a></li>
                    <li><a href="#."> Item 3-22 </a></li>
                    <li><a href="#."> Item 3-23 </a></li>
                </ul>   
            </li>
            <li><a href="#">Item 3-3</a></li>
            <li><a href="#">Item 3-4</a></li>
            <li><a href="#">Item 3-5</a></li>
        </ul>
    </li>
    <li><a class="clk" href="#">Item 4</a>
        <ul class="sub-menu">
            <li><a href="#">Item 4-1</a>
                <ul class="sub-menu">
                    <li><a href="#."> Item 4-11 </a></li>
                    <li><a href="#."> Item 4-12 </a></li>
                    <li><a href="#."> Item 4-13 </a>
                        <ul>
                            <li><a href="#."> Item 4-131 </a></li>
                            <li><a href="#."> Item 4-132 </a></li>
                            <li><a href="#."> Item 4-133 </a></li>
                        </ul>
                    </li>
                </ul>
            </li>
            <li><a href="#">Item 4-2</a></li>
            <li><a href="#">Item 4-3</a></li>
        </ul>
    </li>
    <li><a class="clk" href="#">Item 5</a></li>
</ul>

javascript

$(document).ready(function(){

var menu = "#nav";
var position = {my: "left top", at: "left bottom"};

$(menu).menu({

    position: position,
    blur: function() {
        $(this).menu("option", "position", position);
        },
    focus: function(e, ui) {

        if ($(menu).get(0) !== $(ui).get(0).item.parent().get(0)) {
            $(this).menu("option", "position", {my: "left top", at: "right top"});
            }
    }
});     });

CSS

.ui-menu {width: auto;}.ui-menu:after {content: ".";display: block;clear: both;visibility: hidden;line-height: 0;height: 0;}.ui-menu .ui-menu-item {display: inline-block;margin: 0;padding: 0;width: auto;}#nav{text-align: center;font-size: 12px;}#nav li {display: inline-block;}#nav li a span.ui-icon-carat-1-e {float:right;position:static;margin-top:2px;width:16px;height:16px;background:url(https://www.drupal.org/files/issues/ui-icons-222222-256x240.png) no-repeat -64px -16px;}#nav li ul li {width: 120px;border-bottom: 1px solid #ccc;}#nav li ul {width: 120px; }.ui-menu .ui-menu-item li a span.ui-icon-carat-1-e {background:url(https://www.drupal.org/files/issues/ui-icons-222222-256x240.png) no-repeat -32px -16px !important;

How to insert a line break before an element using CSS

You can populate your document with <br> tags and turn them on\off with css just like any others:

<style>
.hideBreaks {
 display:none;
}
</style>
<html>
just a text line<br class='hideBreaks'> for demonstration
</html>

Sequelize.js delete query?

I've searched deep into the code, step by step into the following files:

https://github.com/sdepold/sequelize/blob/master/test/Model/destroy.js

https://github.com/sdepold/sequelize/blob/master/lib/model.js#L140

https://github.com/sdepold/sequelize/blob/master/lib/query-interface.js#L207-217

https://github.com/sdepold/sequelize/blob/master/lib/connectors/mysql/query-generator.js

What I found:

There isn't a deleteAll method, there's a destroy() method you can call on a record, for example:

Project.find(123).on('success', function(project) {
  project.destroy().on('success', function(u) {
    if (u && u.deletedAt) {
      // successfully deleted the project
    }
  })
})

show all tables in DB2 using the LIST command

Run this command line on your preferred shell session:

db2 "select tabname from syscat.tables where owner = 'DB2INST1'"

Maybe you'd like to modify the owner name, and need to check the list of current owners?

db2 "select distinct owner from syscat.tables"

How to use sed/grep to extract text between two words?

The accepted answer does not remove text that could be before Here or after String. This will:

sed -e 's/.*Here\(.*\)String.*/\1/'

The main difference is the addition of .* immediately before Here and after String.

Is there an easy way to reload css without reloading the page?

There is absolutely no need to use jQuery for this. The following JavaScript function will reload all your CSS files:

function reloadCss()
{
    var links = document.getElementsByTagName("link");
    for (var cl in links)
    {
        var link = links[cl];
        if (link.rel === "stylesheet")
            link.href += "";
    }
}

How do you do exponentiation in C?

pow only works on floating-point numbers (doubles, actually). If you want to take powers of integers, and the base isn't known to be an exponent of 2, you'll have to roll your own.

Usually the dumb way is good enough.

int power(int base, unsigned int exp) {
    int i, result = 1;
    for (i = 0; i < exp; i++)
        result *= base;
    return result;
 }

Here's a recursive solution which takes O(log n) space and time instead of the easy O(1) space O(n) time:

int power(int base, int exp) {
    if (exp == 0)
        return 1;
    else if (exp % 2)
        return base * power(base, exp - 1);
    else {
        int temp = power(base, exp / 2);
        return temp * temp;
    }
}

Optimal way to concatenate/aggregate strings

SOLUTION

The definition of optimal can vary, but here's how to concatenate strings from different rows using regular Transact SQL, which should work fine in Azure.

;WITH Partitioned AS
(
    SELECT 
        ID,
        Name,
        ROW_NUMBER() OVER (PARTITION BY ID ORDER BY Name) AS NameNumber,
        COUNT(*) OVER (PARTITION BY ID) AS NameCount
    FROM dbo.SourceTable
),
Concatenated AS
(
    SELECT 
        ID, 
        CAST(Name AS nvarchar) AS FullName, 
        Name, 
        NameNumber, 
        NameCount 
    FROM Partitioned 
    WHERE NameNumber = 1

    UNION ALL

    SELECT 
        P.ID, 
        CAST(C.FullName + ', ' + P.Name AS nvarchar), 
        P.Name, 
        P.NameNumber, 
        P.NameCount
    FROM Partitioned AS P
        INNER JOIN Concatenated AS C 
                ON P.ID = C.ID 
                AND P.NameNumber = C.NameNumber + 1
)
SELECT 
    ID,
    FullName
FROM Concatenated
WHERE NameNumber = NameCount

EXPLANATION

The approach boils down to three steps:

  1. Number the rows using OVER and PARTITION grouping and ordering them as needed for the concatenation. The result is Partitioned CTE. We keep counts of rows in each partition to filter the results later.

  2. Using recursive CTE (Concatenated) iterate through the row numbers (NameNumber column) adding Name values to FullName column.

  3. Filter out all results but the ones with the highest NameNumber.

Please keep in mind that in order to make this query predictable one has to define both grouping (for example, in your scenario rows with the same ID are concatenated) and sorting (I assumed that you simply sort the string alphabetically before concatenation).

I've quickly tested the solution on SQL Server 2012 with the following data:

INSERT dbo.SourceTable (ID, Name)
VALUES 
(1, 'Matt'),
(1, 'Rocks'),
(2, 'Stylus'),
(3, 'Foo'),
(3, 'Bar'),
(3, 'Baz')

The query result:

ID          FullName
----------- ------------------------------
2           Stylus
3           Bar, Baz, Foo
1           Matt, Rocks

how to access master page control from content page

It Works

To find master page controls on Child page 

Label lbl_UserName = this.Master.FindControl("lbl_UserName") as Label;                    
lbl_UserName.Text = txtUsr.Text;

How to change file encoding in NetBeans?

Just try to set the Projects Encoding to "UTF-8" and copy the file (which is encoded in iso) in the same Project (and if you dont need the old file just delete it) - now the copied file will be as UTF-8 - maybe this will help you :)

Convert float to std::string in C++

You can use std::to_string in C++11

float val = 2.5;
std::string my_val = std::to_string(val);

Add directives from directive in AngularJS

There was a change from 1.3.x to 1.4.x.

In Angular 1.3.x this worked:

var dir: ng.IDirective = {
    restrict: "A",
    require: ["select", "ngModel"],
    compile: compile,
};

function compile(tElement: ng.IAugmentedJQuery, tAttrs, transclude) {
    tElement.append("<option value=''>--- Kein ---</option>");

    return function postLink(scope: DirectiveScope, element: ng.IAugmentedJQuery, attributes: ng.IAttributes) {
        attributes["ngOptions"] = "a.ID as a.Bezeichnung for a in akademischetitel";
        scope.akademischetitel = AkademischerTitel.query();
    }
}

Now in Angular 1.4.x we have to do this:

var dir: ng.IDirective = {
    restrict: "A",
    compile: compile,
    terminal: true,
    priority: 10,
};

function compile(tElement: ng.IAugmentedJQuery, tAttrs, transclude) {
    tElement.append("<option value=''>--- Kein ---</option>");
    tElement.removeAttr("tq-akademischer-titel-select");
    tElement.attr("ng-options", "a.ID as a.Bezeichnung for a in akademischetitel");

    return function postLink(scope: DirectiveScope, element: ng.IAugmentedJQuery, attributes: ng.IAttributes) {

        $compile(element)(scope);
        scope.akademischetitel = AkademischerTitel.query();
    }
}

(From the accepted answer: https://stackoverflow.com/a/19228302/605586 from Khanh TO).

Test process.env with Jest

In ./package.json:

"jest": {
  "setupFiles": [
    "<rootDir>/jest/setEnvVars.js"
  ]
}

In ./jest/setEnvVars.js:

process.env.SOME_VAR = 'value';

Set mouse focus and move cursor to end of input using jQuery

Looks like clearing the value after focusing and then resetting works.

input.focus();
var tmpStr = input.val();
input.val('');
input.val(tmpStr);

How to test if a file is a directory in a batch script?

I use this:

if not [%1] == [] (
  pushd %~dpn1 2> nul
  if errorlevel == 1 pushd %~dp1
)

How to delete all data from solr and hbase

To delete all documents of a Solr collection, you can use this request:

curl -X POST -H 'Content-Type: application/json' --data-binary '{"delete":{"query":"*:*" }}' http://localhost:8983/solr/my_collection/update

It uses JSON body.

How to make HTML element resizable using pure Javascript?

I really recommend using some sort of library, but you asked for it, you get it:

var p = document.querySelector('p'); // element to make resizable

p.addEventListener('click', function init() {
    p.removeEventListener('click', init, false);
    p.className = p.className + ' resizable';
    var resizer = document.createElement('div');
    resizer.className = 'resizer';
    p.appendChild(resizer);
    resizer.addEventListener('mousedown', initDrag, false);
}, false);

var startX, startY, startWidth, startHeight;

function initDrag(e) {
   startX = e.clientX;
   startY = e.clientY;
   startWidth = parseInt(document.defaultView.getComputedStyle(p).width, 10);
   startHeight = parseInt(document.defaultView.getComputedStyle(p).height, 10);
   document.documentElement.addEventListener('mousemove', doDrag, false);
   document.documentElement.addEventListener('mouseup', stopDrag, false);
}

function doDrag(e) {
   p.style.width = (startWidth + e.clientX - startX) + 'px';
   p.style.height = (startHeight + e.clientY - startY) + 'px';
}

function stopDrag(e) {
    document.documentElement.removeEventListener('mousemove', doDrag, false);
    document.documentElement.removeEventListener('mouseup', stopDrag, false);
}

Demo

Remember that this may not run in all browsers (tested only in Firefox, definitely not working in IE <9).

onclick or inline script isn't working in extension

I had the same problem, and didn´t want to rewrite the code, so I wrote a function to modify the code and create the inline declarated events:

function compile(qSel){
    var matches = [];
    var match = null;
    var c = 0;

    var html = $(qSel).html();
    var pattern = /(<(.*?)on([a-zA-Z]+)\s*=\s*('|")(.*)('|")(.*?))(>)/mg;

    while (match = pattern.exec(html)) {
        var arr = [];
        for (i in match) {
            if (!isNaN(i)) {
                arr.push(match[i]);
            }
        }
        matches.push(arr);
    }
    var items_with_events = [];
    var compiledHtml = html;

    for ( var i in matches ){
        var item_with_event = {
            custom_id : "my_app_identifier_"+i,
            code : matches[i][5],
            on : matches[i][3],
        };
        items_with_events.push(item_with_event);
        compiledHtml = compiledHtml.replace(/(<(.*?)on([a-zA-Z]+)\s*=\s*('|")(.*)('|")(.*?))(>)/m, "<$2 custom_id='"+item_with_event.custom_id+"' $7 $8");
    }

    $(qSel).html(compiledHtml);

    for ( var i in items_with_events ){
        $("[custom_id='"+items_with_events[i].custom_id+"']").bind(items_with_events[i].on, function(){
            eval(items_with_events[i].code);
        });
    }
}

$(document).ready(function(){
    compile('#content');
})

This should remove all inline events from the selected node, and recreate them with jquery instead.

CSS: Center block, but align contents to the left

Reposting the working answer from the other question: How to horizontally center a floating element of a variable width?

Assuming the element which is floated and will be centered is a div with an id="content" ...

<body>
<div id="wrap">
   <div id="content">
   This will be centered
   </div>
</div>
</body>

And apply the following CSS

#wrap {
    float: left;
    position: relative;
    left: 50%;
}

#content {
    float: left;
    position: relative;
    left: -50%;
}

Here is a good reference regarding that http://dev.opera.com/articles/view/35-floats-and-clearing/#centeringfloats

Gerrit error when Change-Id in commit messages are missing

Try this:

git commit --amend

Then copy and paste the Change-Id: I55862204ef71f69bc88c79fe2259f7cb8365699a at the end of the file.

Save it and push it again!

RelativeLayout center vertical

This maybe because the textview is too high. Change android:layout_height of the textview to wrap_content or use 

android:gravity="center_vertical"

How to extract a value from a string using regex and a shell?

You can use rextract to extract using a regular expression and reformat the result.

Example:

[$] echo "12 BBQ ,45 rofl, 89 lol" | ./rextract '[,]([\d]+) rofl' '${1}'
45

Filter Excel pivot table using VBA

Field.CurrentPage only works for Filter fields (also called page fields).
If you want to filter a row/column field, you have to cycle through the individual items, like so: 

Sub FilterPivotField(Field As PivotField, Value)
    Application.ScreenUpdating = False
    With Field
        If .Orientation = xlPageField Then
            .CurrentPage = Value
        ElseIf .Orientation = xlRowField Or .Orientation = xlColumnField Then
            Dim i As Long
            On Error Resume Next ' Needed to avoid getting errors when manipulating PivotItems that were deleted from the data source.
            ' Set first item to Visible to avoid getting no visible items while working
            .PivotItems(1).Visible = True
            For i = 2 To Field.PivotItems.Count
                If .PivotItems(i).Name = Value Then _
                    .PivotItems(i).Visible = True Else _
                    .PivotItems(i).Visible = False
            Next i
            If .PivotItems(1).Name = Value Then _
                .PivotItems(1).Visible = True Else _
                .PivotItems(1).Visible = False
        End If
    End With
    Application.ScreenUpdating = True
End Sub

Then, you would just call:

FilterPivotField ActiveSheet.PivotTables("PivotTable2").PivotFields("SavedFamilyCode"), "K123223"

Naturally, this gets slower the more there are individual different items in the field. You can also use SourceName instead of Name if that suits your needs better.

When does a cookie with expiration time 'At end of session' expire?

Just to correct mingos' answer:

If you set the expiration time to 0, the cookie won't be created at all. I've tested this on Google Chrome at least, and when set to 0 that was the result. The cookie, I guess, expires immediately after creation.

To set a cookie so it expires at the end of the browsing session, simply OMIT the expiration parameter altogether.

Example:

Instead of: 

document.cookie = "cookie_name=cookie_value; 0; path=/";

Just write:

document.cookie = "cookie_name=cookie_value; path=/";

Display Animated GIF

Glide 4.6

1. To Load gif

GlideApp.with(context)
            .load(R.raw.gif) // or url
            .into(imageview);

2. To get the file object

GlideApp.with(context)
                .asGif()
                .load(R.raw.gif) //or url
                .into(new SimpleTarget<GifDrawable>() {
                    @Override
                    public void onResourceReady(@NonNull GifDrawable resource, @Nullable Transition<? super GifDrawable> transition) {

                        resource.start();
                      //resource.setLoopCount(1);
                        imageView.setImageDrawable(resource);
                    }
                });

Do while loop in SQL Server 2008

I am not sure about DO-WHILE IN MS SQL Server 2008 but you can change your WHILE loop logic, so as to USE like DO-WHILE loop.

Examples are taken from here: http://blog.sqlauthority.com/2007/10/24/sql-server-simple-example-of-while-loop-with-continue-and-break-keywords/

  1. Example of WHILE Loop

    DECLARE @intFlag INT
SET @intFlag = 1
WHILE (@intFlag <=5)
BEGIN
    PRINT @intFlag
    SET @intFlag = @intFlag + 1
END
GO

    ResultSet:

    1
2
3
4
5

  2. Example of WHILE Loop with BREAK keyword

    DECLARE @intFlag INT
SET @intFlag = 1
WHILE (@intFlag <=5)
BEGIN
    PRINT @intFlag
    SET @intFlag = @intFlag + 1
    IF @intFlag = 4
        BREAK;
END
GO

    ResultSet:

    1
2
3

  3. Example of WHILE Loop with CONTINUE and BREAK keywords

    DECLARE @intFlag INT
SET @intFlag = 1
WHILE (@intFlag <=5)
BEGIN
    PRINT @intFlag
    SET @intFlag = @intFlag + 1
    CONTINUE;
    IF @intFlag = 4 -- This will never executed
        BREAK;
END
GO

    ResultSet:

    1
2
3
4
5

But try to avoid loops at database level. Reference.

How to make an authenticated web request in Powershell?

In some case NTLM authentication still won't work if given the correct credential.

There's a mechanism which will void NTLM auth within WebClient, see here for more information: System.Net.WebClient doesn't work with Windows Authentication

If you're trying above answer and it's still not working, follow the above link to add registry to make the domain whitelisted.

Post this here to save other's time ;)

java.sql.SQLException: No suitable driver found for jdbc:microsoft:sqlserver

Your URL should be jdbc:sqlserver://server:port;DatabaseName=dbname
and Class name should be like com.microsoft.sqlserver.jdbc.SQLServerDriver
Use MicrosoftSQL Server JDBC Driver 2.0

What's the difference between deadlock and livelock?

I just planned to share some knowledge.

Deadlocks A set of threads/processes is deadlocked, if each thread/process in the set is waiting for an event that only another process in the set can cause.

The important thing here is another process is also in the same set. that means another process also blocked and no one can proceed.

Deadlocks occur when processes are granted exclusive access to resources.

These four conditions should be satisfied to have a deadlock.

  1. Mutual exclusion condition (Each resource is assigned to 1 process)
  2. Hold and wait condition (Process holding resources and at the same time it can ask other resources).
  3. No preemption condition (Previously granted resources can not forcibly be taken away) #This condition depends on the application
  4. Circular wait condition (Must be a circular chain of 2 or more processes and each is waiting for resource held by the next member of the chain) # It will happen dynamically

If we found these conditions then we can say there may be occurred a situation like a deadlock.

LiveLock

Each thread/process is repeating the same state again and again but doesn't progress further. Something similar to a deadlock since the process can not enter the critical section. However in a deadlock, processes are wait without doing anything but in livelock, the processes are trying to proceed but processes are repeated to the same state again and again.

(In a deadlocked computation there is no possible execution sequence which succeeds. but In a livelocked computation, there are successful computations, but there are one or more execution sequences in which no process enters its critical section.)

Difference from deadlock and livelock

When deadlock happens, No execution will happen. but in livelock, some executions will happen but those executions are not enough to enter the critical section.

How to finish Activity when starting other activity in Android?

 
Intent i = new Intent(this,Here is your first activity.Class);
    i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    startActivity(i);
    finish();

Find out where MySQL is installed on Mac OS X

If you downloaded mySQL using a DMG (easiest way to download found here http://dev.mysql.com/downloads/mysql/) in Terminal try: cd /usr/local/

When you type ls you should see mysql-YOUR-VERSION. You will also see mysql which is the installation directory.

Source: http://geeksww.com/tutorials/database_management_systems/mysql/installation/how_to_download_and_install_mysql_on_mac_os_x.php

Autoplay audio files on an iPad with HTML5

Apple does not support the standard completely, but there is a workaround. Their justification is cellular network congestion, maybe because you'll land on pages that play random audio. This behavior doesn't change when a device goes on wifi, maybe for consistency. By the way, those pages are usually a bad idea anyway. You should not be trying to put a soundtrack on every web page. That's just wrong. :)

html5 audio will play if it is started as the result of a user action. Loading a page does not count. So you need to restructure your web app to be an all-in-one-page app. Instead of a link that opens a page that plays audio, you need that link to play it on the current page, without a page change. This "user interaction" rule applies to the html5 methods you can call on an audio or video element. The calls return without any effect if they are fired automatically on page load, but they work when called from event handlers.

Passing null arguments to C# methods

You can use NullableValueTypes (like int?) for this. The code would be like this:

private void Example(int? arg1, int? arg2)
{
    if(!arg1.HasValue)
    {
        //do something
    }
    if(!arg2.HasValue)
    {
        //do something else
    }
}

import sun.misc.BASE64Encoder results in error compiled in Eclipse

Be careful, sun.misc.BASE64Decoder is not available in JDK-13

use regular expression in if-condition in bash

@OP,

Is glob pettern not only used for file names?

No, "glob" pattern is not only used for file names. you an use it to compare strings as well. In your examples, you can use case/esac to look for strings patterns.

 gg=svm-grid-ch 
 # looking for the word "grid" in the string $gg
 case "$gg" in
    *grid* ) echo "found";;
 esac

 # [[ $gg =~ ^....grid* ]]
 case "$gg" in ????grid*) echo "found";; esac 

 # [[ $gg =~ s...grid* ]]
 case "$gg" in s???grid*) echo "found";; esac

In bash, when to use glob pattern and when to use regular expression? Thanks!

Regex are more versatile and "convenient" than "glob patterns", however unless you are doing complex tasks that "globbing/extended globbing" cannot provide easily, then there's no need to use regex. Regex are not supported for version of bash <3.2 (as dennis mentioned), but you can still use extended globbing (by setting extglob ). for extended globbing, see here and some simple examples here.

Update for OP: Example to find files that start with 2 characters (the dots "." means 1 char) followed by "g" using regex

eg output

$ shopt -s dotglob
$ ls -1 *
abg
degree
..g

$ for file in *; do [[ $file =~ "..g" ]] && echo $file ; done
abg
degree
..g

In the above, the files are matched because their names contain 2 characters followed by "g". (ie ..g).

The equivalent with globbing will be something like this: (look at reference for meaning of ? and * )

$ for file in ??g*; do echo $file; done
abg
degree
..g

Check if a string matches a regex in Bash script

You can use the test construct, [[ ]], along with the regular expression match operator, =~, to check if a string matches a regex pattern.

For your specific case, you can write:

[[ $date =~ ^[0-9]{8}$ ]] && echo "yes"

Or more a accurate test:

[[ $date =~ ^[0-9]{4}(0[1-9]|1[0-2])(0[1-9]|[1-2][0-9]|3[0-1])$ ]] && echo "yes"
#           |^^^^^^^^ ^^^^^^ ^^^^^^  ^^^^^^ ^^^^^^^^^^ ^^^^^^ |
#           |   |     ^^^^^^^^^^^^^  ^^^^^^^^^^^^^^^^^^^^^^^^ |
#           |   |          |                   |              |
#           |   |           \                  |              |
#           | --year--   --month--           --day--          |
#           |          either 01...09      either 01..09     end of line
# start of line            or 10,11,12         or 10..29
#                                              or 30, 31

That is, you can define a regex in Bash matching the format you want. This way you can do:

[[ $date =~ ^regex$ ]] && echo "matched" || echo "did not match"

where commands after && are executed if the test is successful, and commands after || are executed if the test is unsuccessful.

Note this is based on the solution by Aleks-Daniel Jakimenko in User input date format verification in bash.

In other shells you can use grep. If your shell is POSIX compliant, do

(echo "$date" | grep -Eq  ^regex$) && echo "matched" || echo "did not match"

In fish, which is not POSIX-compliant, you can do

echo "$date" | grep -Eq "^regex\$"; and echo "matched"; or echo "did not match"

Replace Both Double and Single Quotes in Javascript String

You don't escape quotes in regular expressions 

this.Vals.replace(/["']/g, "")

PHP - cannot use a scalar as an array warning

Also make sure that you don't declare it an array and then try to assign something else to the array like a string, float, integer. I had that problem. If you do some echos of output I was seeing what I wanted the first time, but not after another pass of the same code.

TSQL How do you output PRINT in a user defined function?

I have tended in the past to work on my functions in two stages. The first stage would be to treat them as fairly normal SQL queries and make sure that I am getting the right results out of it. After I am confident that it is performing as desired, then I would convert it into a UDF.

Python find elements in one list that are not in the other

You can use sets:

main_list = list(set(list_2) - set(list_1))

Output:

>>> list_1=["a", "b", "c", "d", "e"]
>>> list_2=["a", "f", "c", "m"]
>>> set(list_2) - set(list_1)
set(['m', 'f'])
>>> list(set(list_2) - set(list_1))
['m', 'f']

Per @JonClements' comment, here is a tidier version:

>>> list_1=["a", "b", "c", "d", "e"]
>>> list_2=["a", "f", "c", "m"]
>>> list(set(list_2).difference(list_1))
['m', 'f']

Repository Pattern Step by Step Explanation

This is a nice example: The Repository Pattern Example in C#

Basically, repository hides the details of how exactly the data is being fetched/persisted from/to the database. Under the covers:

  • for reading, it creates the query satisfying the supplied criteria and returns the result set
  • for writing, it issues the commands necessary to make the underlying persistence engine (e.g. an SQL database) save the data

How do I set the eclipse.ini -vm option?

My solution is:

-vm
D:/work/Java/jdk1.6.0_13/bin/javaw.exe
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256M
-framework
plugins\org.eclipse.osgi_3.4.3.R34x_v20081215-1030.jar
-vmargs
-Dosgi.requiredJavaVersion=1.5
-Xms40m
-Xmx512m

How do you check "if not null" with Eloquent?

I see this question is a bit old but I ran across it looking for an answer. Although I did not have success with the answers here I think this might be because I'm on PHP 7.2 and Laravel 5.7. or possible because I was just playing around with some data on the CLI using Laravel Tinker.

I have some things I tried that worked for me and others that did not that I hope will help others out.

I did not have success running:

    MyModel::whereNotNull('deleted_by')->get()->all();             // []
    MyModel::where('deleted_by', '<>', null)->get()->all();        // []
    MyModel::where('deleted_by', '!=', null)->get()->all();        // []
    MyModel::where('deleted_by', '<>', '', 'and')->get()->all();   // []
    MyModel::where('deleted_by', '<>', null, 'and')->get()->all(); // []
    MyModel::where('deleted_by', 'IS NOT', null)->get()->all();    // []

All of the above returned an empty array for me

I did however have success running:

    DB::table('my_models')->whereNotNull('deleted_by')->get()->all(); // [ ... ]

This returned all the results in an array as I expected. Note: you can drop the all() and get back a Illuminate\Database\Eloquent\Collection instead of an array if you prefer.

Print: Entry, ":CFBundleIdentifier", Does Not Exist

Adding one to the list of possible causes: xcodebuild could be corrupted.

In my case xcodebuild didn't do anything, so it never generated the ios/build/ directory, and the above error resulted.

I used 'which xcodebuild' on the command line, deleted it, and the error was gone

Just took me a while to realize that xcodebuild was bad - I looked at log messages and manually ran the xcodebuild command with the react native parameters - no output of any kind. No build messages, no error messages, nothing. Ran with no params - same....

Leaving this here as one more thing to check if this error message appears. Is your xcodebuild working?

The meaning of NoInitialContextException error

you need to use jboss-client.jar in your client project and you need to use jnp-client jar in your ejb project

Hibernate Group by Criteria Object

You can use the approach @Ken Chan mentions, and add a single line of code after that if you want a specific list of Objects, example:

    session.createCriteria(SomeTable.class)       
                    .add(Restrictions.ge("someColumn", xxxxx))      
                    .setProjection(Projections.projectionList()
                            .add(Projections.groupProperty("someColumn"))
                            .add(Projections.max("someColumn"))
                            .add(Projections.min("someColumn"))
                            .add(Projections.count("someColumn"))           
                    ).setResultTransformer(Transformers.aliasToBean(SomeClazz.class));

List<SomeClazz> objectList = (List<SomeClazz>) criteria.list();

Difference between id and name attributes in HTML

name is deprecated for link targets, and invalid in HTML5. It no longer works at least in latest Firefox (v13). Change <a name="hello"> to<a id="hello">

The target does not need to be an <a> tag, it can be <p id="hello"> or <h2 id="hello"> etc. which is often cleaner code.

As other posts say clearly, name is still used (needed) in forms. It is also still used in META tags.

SQL subquery with COUNT help

Assuming there is a column named business:

SELECT Business, COUNT(*) FROM eventsTable GROUP BY Business

ES6 Map in Typescript

How do I declare an ES6 Map type in typescript?

You need to target --module es6. This is misfortunate and you can raise your concern here : https://github.com/Microsoft/TypeScript/issues/2953#issuecomment-98514111

How to draw circle in html page?

As of 2015, you can make it and center the text with as few as 15 lines of CSS (Fiddle):

_x000D_
_x000D_ 
body {_x000D_
  background-color: #fff;_x000D_
}_x000D_
#circle {_x000D_
  position: relative;_x000D_
  background-color: #09f;_x000D_
  margin: 20px auto;_x000D_
  width: 400px;_x000D_
  height: 400px;_x000D_
  border-radius: 200px;_x000D_
}_x000D_
#text {_x000D_
  position: absolute;_x000D_
  top: 50%;_x000D_
  left: 50%;_x000D_
  transform: translate(-50%, -50%);_x000D_
  color: #fff;_x000D_
}
_x000D_ 
<!DOCTYPE html>_x000D_
<html lang="en">_x000D_
_x000D_
<head>_x000D_
  <meta charset="UTF-8">_x000D_
  <title>circle with text</title>_x000D_
_x000D_
</head>_x000D_
_x000D_
<body>_x000D_
  <div id="circle">_x000D_
    <div id="text">Text in the circle</div>_x000D_
  </div>_x000D_
</body>_x000D_
_x000D_
</html>
_x000D_
_x000D_
_x000D_

Without any -webkit-s, this works on IE11, Firefox, Chrome and Opera, and it is valid HTML5 (experimental) and CSS3.

Same on MS Edge (2020).

How can I make XSLT work in chrome?

At the time of writing, there was a bug in chrome which required an xmlns attribute in order to trigger rendering:

<xsl:stylesheet xmlns="http://www.w3.org/1999/xhtml" ... >

This was the problem I was running into when serving the xml file from a server.

If unlike me, you are viewing the xml file from a file:/// url, then the solutions mentioning --allow-file-access-from-files are the ones you want

How to return JSON with ASP.NET & jQuery

Asp.net is pretty good at automatically converting .net objects to json. Your List object if returned in your webmethod should return a json/javascript array. What I mean by this is that you shouldn't change the return type to string (because that's what you think the client is expecting) when returning data from a method. If you return a .net array from a webmethod a javaScript array will be returned to the client. It doesn't actually work too well for more complicated objects, but for simple array data its fine.

Of course, it's then up to you to do what you need to do on the client side.

I would be thinking something like this:

[WebMethod]
public static List GetProducts()
{
   var products  = context.GetProducts().ToList();   
   return products;
}

There shouldn't really be any need to initialise any custom converters unless your data is more complicated than simple row/col data

Warning: mysqli_error() expects exactly 1 parameter, 0 given error

At first, the problem is because you did't put any parameter for mysqli_error. I can see that it has been solved based on the post here. Most probably, the next problem is cause by wrong file path for the included file.. .

Are you sure this code

$myConnection = mysqli_connect("$db_host","$db_username","$db_pass","$db_name") or die ("could not connect to mysql");

is in the 'scripts' folder and your main code file is on the same level as the script folder?

For files in directory, only echo filename (no path)

if you want filename only :

for file in /home/user/*; do       
  f=$(echo "${file##*/}");
  filename=$(echo $f| cut  -d'.' -f 1); #file has extension, it return only filename
  echo $filename
done

for more information about cut command see here.

Kill python interpeter in linux from the terminal

 
pkill -9 python

should kill any running python process.

What is a "web service" in plain English?

The best plain English explanation comes from using an analogy:

  • Web pages allow people to communicate and collaborate with each other.
  • Web services allow programs to communicate and collaborate with each other.

Your PHP example is a web service by that definition, because the output could be consumed by another program. But in reality, HTML screen-scraping is not a reliable or maintainable way of producing web services.

How to access parent Iframe from JavaScript

Maybe just use 

window.parent

into your iframe to get the calling frame / windows. If you had multiple calling frame, you can use 

window.top

foreach with index

I just figured out interesting solution:

public class DepthAware<T> : IEnumerable<T>
{
    private readonly IEnumerable<T> source;

    public DepthAware(IEnumerable<T> source)
    {
        this.source = source;
        this.Depth = 0;
    }

    public int Depth { get; private set; }

    private IEnumerable<T> GetItems()
    {
        foreach (var item in source)
        {
            yield return item;
            ++this.Depth;
        }
    }

    public IEnumerator<T> GetEnumerator()
    {
        return GetItems().GetEnumerator();
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }
}

// Generic type leverage and extension invoking
public static class DepthAware
{
    public static DepthAware<T> AsDepthAware<T>(this IEnumerable<T> source)
    {
        return new DepthAware<T>(source);
    }

    public static DepthAware<T> New<T>(IEnumerable<T> source)
    {
        return new DepthAware<T>(source);
    }
}

Usage:

var chars = new[] {'a', 'b', 'c', 'd', 'e', 'f', 'g'}.AsDepthAware();

foreach (var item in chars)
{
    Console.WriteLine("Char: {0}, depth: {1}", item, chars.Depth);
}

Intellij IDEA Java classes not auto compiling on save

Not enough points to comment on an existing answer, but similar to some people above, I wound up just adding a macro & keymap to Organize Imports / Format / SaveAll / FastReload(F9) / Synchronize.

The synchronize is added as it seems to be the only way I can also see updates in resources modified by external build tools / watchers (i.e., webpack).

The process is slower than eclipse - and for the external file refresh often have to run the command multiple times - but suppose I can live with it.

JavaScript operator similar to SQL "like"

No there isn't, but you can check out indexOf as a starting point to developing your own, and/or look into regular expressions. It would be a good idea to familiarise yourself with the JavaScript string functions.

EDIT: This has been answered before:

Emulating SQL LIKE in JavaScript

How to set a tkinter window to a constant size

There are 2 solutions for your problem:

  1. Either you set a fixed size of the Tkinter window; mw.geometry('500x500')

OR

  1. Make the Frame adjust to the size of the window automatically;back.place(x = 0, y = 0, relwidth = 1, relheight = 1)

*The second option should be used in place of back.pack()

How to enable GZIP compression in IIS 7.5

If anyone runs across this and is looking for a bit more up-to-date answer or copy-paste answer or answer targeting multiple versions than JC Raja's post, here's what I've found:

Google's got a pretty solid, easy-to-understand introduction to how this works and what is advantageous and not. https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/optimize-encoding-and-transfer They recommend the HTML5 Boilerplate project, which has solutions for different versions of IIS:

  • .NET version 3
  • .NET version 4
  • .NET version 4.5 / MVC 5

Available here: https://github.com/h5bp/server-configs-iis They have web.configs that you can copy and paste changes from theirs to yours and see the changes, much easier than digging through a bunch of blog posts.

Here's the web.config settings for .NET version 4.5: https://github.com/h5bp/server-configs-iis/blob/master/dotnet%204.5/MVC5/Web.config

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <appSettings>
    <add key="webpages:Version" value="3.0.0.0" />
    <add key="webpages:Enabled" value="false" />
    <add key="ClientValidationEnabled" value="true" />
    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
  </appSettings>
  <system.web>
    <!--
            Set compilation debug="true" to insert debugging
            symbols into the compiled page. Because this
            affects performance, set this value to true only
            during development.
    -->
    <compilation debug="true" targetFramework="4.5" />

    <!-- Security through obscurity, removes  X-AspNet-Version HTTP header from the response -->
    <!-- Allow zombie DOS names to be captured by ASP.NET (/con, /com1, /lpt1, /aux, /prt, /nul, etc) -->
    <httpRuntime targetFramework="4.5" requestValidationMode="2.0" requestPathInvalidCharacters="" enableVersionHeader="false" relaxedUrlToFileSystemMapping="true" />

    <!-- httpCookies httpOnlyCookies setting defines whether cookies 
             should be exposed to client side scripts
             false (Default): client side code can access cookies
             true: client side code cannot access cookies
             Require SSL is situational, you can also define the 
             domain of cookies with optional "domain" property -->
    <httpCookies httpOnlyCookies="true" requireSSL="false" />

    <trace writeToDiagnosticsTrace="false" enabled="false" pageOutput="false" localOnly="true" />
  </system.web>


  <system.webServer>
    <!-- GZip static file content.  Overrides the server default which only compresses static files over 2700 bytes -->
    <httpCompression directory="%SystemDrive%\websites\_compressed" minFileSizeForComp="1024">
      <scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" />
      <staticTypes>
        <add mimeType="text/*" enabled="true" />
        <add mimeType="message/*" enabled="true" />
        <add mimeType="application/javascript" enabled="true" />
        <add mimeType="application/json" enabled="true" />
        <add mimeType="*/*" enabled="false" />
      </staticTypes>
    </httpCompression>

    <httpErrors existingResponse="PassThrough" errorMode="Custom">
      <!-- Catch IIS 404 error due to paths that exist but shouldn't be served (e.g. /controllers, /global.asax) or IIS request filtering (e.g. bin, web.config, app_code, app_globalresources, app_localresources, app_webreferences, app_data, app_browsers) -->
      <remove statusCode="404" subStatusCode="-1" />
      <error statusCode="404" subStatusCode="-1" path="/notfound" responseMode="ExecuteURL" />
      <remove statusCode="500" subStatusCode="-1" />
      <error statusCode="500" subStatusCode="-1" path="/error" responseMode="ExecuteURL" />
    </httpErrors>

    <directoryBrowse enabled="false" />
    <validation validateIntegratedModeConfiguration="false" />

    <!-- Microsoft sets runAllManagedModulesForAllRequests to true by default
             You should handle this according to need but consider the performance hit.
             Good source of reference on this matter: http://www.west-wind.com/weblog/posts/2012/Oct/25/Caveats-with-the-runAllManagedModulesForAllRequests-in-IIS-78
        -->
    <modules runAllManagedModulesForAllRequests="false" />

    <urlCompression doStaticCompression="true" doDynamicCompression="true" />
    <staticContent>
      <!-- Set expire headers to 30 days for static content-->
      <clientCache cacheControlMode="UseMaxAge" cacheControlMaxAge="30.00:00:00" />
      <!-- use utf-8 encoding for anything served text/plain or text/html -->
      <remove fileExtension=".css" />
      <mimeMap fileExtension=".css" mimeType="text/css" />
      <remove fileExtension=".js" />
      <mimeMap fileExtension=".js" mimeType="text/javascript" />
      <remove fileExtension=".json" />
      <mimeMap fileExtension=".json" mimeType="application/json" />
      <remove fileExtension=".rss" />
      <mimeMap fileExtension=".rss" mimeType="application/rss+xml; charset=UTF-8" />
      <remove fileExtension=".html" />
      <mimeMap fileExtension=".html" mimeType="text/html; charset=UTF-8" />
      <remove fileExtension=".xml" />
      <mimeMap fileExtension=".xml" mimeType="application/xml; charset=UTF-8" />
      <!-- HTML5 Audio/Video mime types-->
      <remove fileExtension=".mp3" />
      <mimeMap fileExtension=".mp3" mimeType="audio/mpeg" />
      <remove fileExtension=".mp4" />
      <mimeMap fileExtension=".mp4" mimeType="video/mp4" />
      <remove fileExtension=".ogg" />
      <mimeMap fileExtension=".ogg" mimeType="audio/ogg" />
      <remove fileExtension=".ogv" />
      <mimeMap fileExtension=".ogv" mimeType="video/ogg" />
      <remove fileExtension=".webm" />
      <mimeMap fileExtension=".webm" mimeType="video/webm" />
      <!-- Proper svg serving. Required for svg webfonts on iPad -->
      <remove fileExtension=".svg" />
      <mimeMap fileExtension=".svg" mimeType="image/svg+xml" />
      <remove fileExtension=".svgz" />
      <mimeMap fileExtension=".svgz" mimeType="image/svg+xml" />
      <!-- HTML4 Web font mime types -->
      <!-- Remove default IIS mime type for .eot which is application/octet-stream -->
      <remove fileExtension=".eot" />
      <mimeMap fileExtension=".eot" mimeType="application/vnd.ms-fontobject" />
      <remove fileExtension=".ttf" />
      <mimeMap fileExtension=".ttf" mimeType="application/x-font-ttf" />
      <remove fileExtension=".ttc" />
      <mimeMap fileExtension=".ttc" mimeType="application/x-font-ttf" />
      <remove fileExtension=".otf" />
      <mimeMap fileExtension=".otf" mimeType="font/opentype" />
      <remove fileExtension=".woff" />
      <mimeMap fileExtension=".woff" mimeType="application/font-woff" />
      <remove fileExtension=".crx" />
      <mimeMap fileExtension=".crx" mimeType="application/x-chrome-extension" />
      <remove fileExtension=".xpi" />
      <mimeMap fileExtension=".xpi" mimeType="application/x-xpinstall" />
      <remove fileExtension=".safariextz" />
      <mimeMap fileExtension=".safariextz" mimeType="application/octet-stream" />
      <!-- Flash Video mime types-->
      <remove fileExtension=".flv" />
      <mimeMap fileExtension=".flv" mimeType="video/x-flv" />
      <remove fileExtension=".f4v" />
      <mimeMap fileExtension=".f4v" mimeType="video/mp4" />
      <!-- Assorted types -->
      <remove fileExtension=".ico" />
      <mimeMap fileExtension=".ico" mimeType="image/x-icon" />
      <remove fileExtension=".webp" />
      <mimeMap fileExtension=".webp" mimeType="image/webp" />
      <remove fileExtension=".htc" />
      <mimeMap fileExtension=".htc" mimeType="text/x-component" />
      <remove fileExtension=".vcf" />
      <mimeMap fileExtension=".vcf" mimeType="text/x-vcard" />
      <remove fileExtension=".torrent" />
      <mimeMap fileExtension=".torrent" mimeType="application/x-bittorrent" />
      <remove fileExtension=".cur" />
      <mimeMap fileExtension=".cur" mimeType="image/x-icon" />
      <remove fileExtension=".webapp" />
      <mimeMap fileExtension=".webapp" mimeType="application/x-web-app-manifest+json; charset=UTF-8" />
    </staticContent>
    <httpProtocol>
      <customHeaders>

        <!--#### SECURITY Related Headers ###
            More information: https://www.owasp.org/index.php/List_of_useful_HTTP_headers
        -->
        <!--
                # Access-Control-Allow-Origin
                The 'Access Control Allow Origin' HTTP header is used to control which
                sites are allowed to bypass same-origin policies and send cross-origin requests.

                Secure configuration: Either do not set this header or return the 'Access-Control-Allow-Origin'
                header restricting it to only a trusted set of sites.
                http://enable-cors.org/

                <add name="Access-Control-Allow-Origin" value="*" />
                -->

        <!--
                # Cache-Control
                The 'Cache-Control' response header controls how pages can be cached
                either by proxies or the user's browser.
                This response header can provide enhanced privacy by not caching
                sensitive pages in the user's browser cache.

                <add name="Cache-Control" value="no-store, no-cache"/>
                -->

        <!--
                # Strict-Transport-Security
                The HTTP Strict Transport Security header is used to control
                if the browser is allowed to only access a site over a secure connection
                and how long to remember the server response for, forcing continued usage.
                Note* Currently a draft standard which only Firefox and Chrome support. But is supported by sites like PayPal.
                <add name="Strict-Transport-Security" value="max-age=15768000"/>
                -->

        <!--
                # X-Frame-Options
                The X-Frame-Options header indicates whether a browser should be allowed
                to render a page within a frame or iframe.
                The valid options are DENY (deny allowing the page to exist in a frame)
                or SAMEORIGIN (allow framing but only from the originating host)
                Without this option set, the site is at a higher risk of click-jacking.

                <add name="X-Frame-Options" value="SAMEORIGIN" />
                -->

        <!--
                # X-XSS-Protection
                The X-XSS-Protection header is used by Internet Explorer version 8+
                The header instructs IE to enable its inbuilt anti-cross-site scripting filter.
                If enabled, without 'mode=block', there is an increased risk that
                otherwise, non-exploitable cross-site scripting vulnerabilities may potentially become exploitable

                <add name="X-XSS-Protection" value="1; mode=block"/>
                -->

        <!--    
                # MIME type sniffing security protection
                Enabled by default as there are very few edge cases where you wouldn't want this enabled.
                Theres additional reading below; but the tldr, it reduces the ability of the browser (mostly IE) 
                being tricked into facilitating driveby attacks.
                http://msdn.microsoft.com/en-us/library/ie/gg622941(v=vs.85).aspx
                http://blogs.msdn.com/b/ie/archive/2008/07/02/ie8-security-part-v-comprehensive-protection.aspx
        -->
        <add name="X-Content-Type-Options" value="nosniff" />

        <!-- A little extra security (by obscurity), removings fun but adding your own is better -->
        <remove name="X-Powered-By" />
        <add name="X-Powered-By" value="My Little Pony" />

        <!--
                 With Content Security Policy (CSP) enabled (and a browser that supports it (http://caniuse.com/#feat=contentsecuritypolicy),
         you can tell the browser that it can only download content from the domains you explicitly allow
         CSP can be quite difficult to configure, and cause real issues if you get it wrong
         There is website that helps you generate a policy here http://cspisawesome.com/
         <add name="Content-Security-Policy" "default-src 'self'; style-src 'self' 'unsafe-inline'; script-src 'self' https://www.google-analytics.com;" />
                -->

        <!--//#### SECURITY Related Headers ###-->

        <!--
                Force the latest IE version, in various cases when it may fall back to IE7 mode
                github.com/rails/rails/commit/123eb25#commitcomment-118920
                Use ChromeFrame if it's installed for a better experience for the poor IE folk
                -->
        <add name="X-UA-Compatible" value="IE=Edge,chrome=1" />
        <!--
                Allow cookies to be set from iframes (for IE only)
                If needed, uncomment and specify a path or regex in the Location directive

                <add name="P3P" value="policyref=&quot;/w3c/p3p.xml&quot;, CP=&quot;IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT&quot;" />
                -->

      </customHeaders>
    </httpProtocol>

    <!--
        <rewrite>
            <rules>

            Remove/force the WWW from the URL.
            Requires IIS Rewrite module http://learn.iis.net/page.aspx/460/using-the-url-rewrite-module/
            Configuration lifted from http://nayyeri.net/remove-www-prefix-from-urls-with-url-rewrite-module-for-iis-7-0

            NOTE* You need to install the IIS URL Rewriting extension (Install via the Web Platform Installer)
            http://www.microsoft.com/web/downloads/platform.aspx

            ** Important Note
            using a non-www version of a webpage will set cookies for the whole domain making cookieless domains
            (eg. fast CD-like access to static resources like CSS, js, and images) impossible.

            # IMPORTANT: THERE ARE TWO RULES LISTED. NEVER USE BOTH RULES AT THE SAME TIME!

                <rule name="Remove WWW" stopProcessing="true">
                    <match url="^(.*)$" />
                    <conditions>
                        <add input="{HTTP_HOST}" pattern="^(www\.)(.*)$" />
                    </conditions>
                    <action type="Redirect" url="http://example.com{PATH_INFO}" redirectType="Permanent" />
                </rule>
                <rule name="Force WWW" stopProcessing="true">
                    <match url=".*" />
                    <conditions>
                        <add input="{HTTP_HOST}" pattern="^example.com$" />
                    </conditions>
                    <action type="Redirect" url="http://www.example.com/{R:0}" redirectType="Permanent" />
                </rule>


                # E-TAGS
                E-Tags are actually quite useful in cache management especially if you have a front-end caching server such as Varnish. http://en.wikipedia.org/wiki/HTTP_ETag / http://developer.yahoo.com/performance/rules.html#etags
                But in load balancing and simply most cases ETags are mishandled in IIS, and it can be advantageous to remove them.
        # removed as in https://stackoverflow.com/questions/7947420/iis-7-5-remove-etag-headers-from-response

        <rewrite>
           <outboundRules>
              <rule name="Remove ETag">
                 <match serverVariable="RESPONSE_ETag" pattern=".+" />
                 <action type="Rewrite" value="" />
              </rule>
           </outboundRules>
        </rewrite>

            -->
    <!--
            ### Built-in filename-based cache busting

            In a managed language such as .net, you should really be using the internal bundler for CSS + js
            or get cassette or similar.

            If you're not using the build script to manage your filename version revving,
            you might want to consider enabling this, which will route requests for
            /css/style.20110203.css to /css/style.css

            To understand why this is important and a better idea than all.css?v1231,
            read: github.com/h5bp/html5-boilerplate/wiki/Version-Control-with-Cachebusting

                <rule name="Cachebusting">
                    <match url="^(.+)\.\d+(\.(js|css|png|jpg|gif)$)" />
                    <action type="Rewrite" url="{R:1}{R:2}" />
                </rule>

            </rules>
        </rewrite>-->

  </system.webServer>

  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-5.0.0.0" newVersion="5.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

Edit: One update if you need Gzip compression on WebAPI responses. I wasn't aware our WebAPI wasn't returning Gzipped responses until recently and scratched my head for a while because we had dynamic and static compression turned on in web.config. We looked at writing our own compression services and response handlers (still on WebAPI 2 not on .NET Core where it's easier now), but that was too cumbersome for what seemed like something we should just be able to turn on.

(If you're interested here's what we were looking at for our own compression service https://krzysztofjakielaszek.com/2017/03/26/webapi2-response-compression-gzip-brotli-deflate/ EDIT: Link is now offline, but you can view the code/content here: https://web.archive.org/web/20190608161201/https://krzysztofjakielaszek.com/2017/03/26/webapi2-response-compression-gzip-brotli-deflate/ )

Instead, we found this great post by Ben Foster (http://benfoster.io/blog/aspnet-web-api-compression) If you can modify applicationHost.config (running your own servers), you can pop that config file open and add the mimeTypes you want to compress (I pulled the relevant ones based on what our API was returning to clients from our Web.Config). Save that file, IIS will pickup your changes, recycle app pools, and your WebAPI will start returning gzip compressed responses to clients who request it.

If you don't see gzipped responses, check the response content type with Fiddler or Chrome/Firefox Dev Tools, and ensure it matches what you added. I had to change the view mode (use large request rows) in Chrome Dev Tools to ensure it showed the total size vs transferred size. If everything validates, try rebooting the server once to just ensure it was properly applied. I did have one syntax error where when I opened up the site in IIS, IIS poppped open a message about a parsing error that I had to fix in the config file.

<httpCompression directory="%TEMP%\iisexpress\IIS Temporary Compressed Files">
    <scheme name="gzip" dll="%IIS_BIN%\gzip.dll" />
    <dynamicTypes>
        ...

        <!-- compress JSON responses from Web API -->           
        <add mimeType="application/json" enabled="true" /> 

        ...
    </dynamicTypes>
    <staticTypes>
        ...
    </staticTypes>
</httpCompression>

How to set width to 100% in WPF

You could use HorizontalContentAlignment="Stretch" as follows: 

<ListBox HorizontalContentAlignment="Stretch"/>

jquery function setInterval

Don't pass the result of swapImages to setInterval by invoking it. Just pass the function, like this:

setInterval(swapImages, 1000);

How can I output a UTF-8 CSV in PHP that Excel will read properly?

I use this and it works 

header('Content-Description: File Transfer');
header('Content-Type: text/csv; charset=UTF-16LE');
header('Content-Disposition: attachment; filename=file.csv');
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
// output headers so that the file is downloaded rather than displayed
// create a file pointer connected to the output stream
$output = fopen('php://output', 'w');
fputs( $output, "\xEF\xBB\xBF" );
// output the column headings
fputcsv($output, array('Thông tin khách hàng dang ký'));
// fetch the data
$setutf8 = "SET NAMES utf8";
$q = $conn->query($setutf8);
$setutf8c = "SET character_set_results = 'utf8', character_set_client =
'utf8', character_set_connection = 'utf8', character_set_database = 'utf8',
character_set_server = 'utf8'";
$qc = $conn->query($setutf8c);
$setutf9 = "SET CHARACTER SET utf8";
$q1 = $conn->query($setutf9);
$setutf7 = "SET COLLATION_CONNECTION = 'utf8_general_ci'";
$q2 = $conn->query($setutf7);
$sql = "SELECT id, name, email FROM myguests";
$rows = $conn->query($sql);
$arr1= array();
if ($rows->num_rows > 0) {
// output data of each row
while($row = $rows->fetch_assoc()) {
    $rcontent = " Name: " . $row["name"]. " - Email: " . $row["email"];  
    $arr1[]["title"] =  $rcontent;
}
} else {
     echo "0 results";
}
$conn->close();
// loop over the rows, outputting them
foreach($arr1 as $result1):
   fputcsv($output, $result1);
endforeach;

How to redirect Valgrind's output to a file?

 
valgrind --log-file="filename"

What can be the reasons of connection refused errors?

I get the same problem with my work computer. The problem is that when you enter localhost it goes to proxy's address not local address you should bypass it follow this steps

Chrome => Settings => Change proxy settings => LAN Settings => check Bypass proxy server for local addresses.

The source was not found, but some or all event logs could not be searched. Inaccessible logs: Security

I recently started receiving this error inside of my internal NLog failures log, with Visual Studio 2013. The solution has been using NLog v2.0.0 for several years. Within the last month, our main log stopped working. To fix this I updated NLog to the newest version (v3.1.0) via Nuget. The security exception is now gone and ALL of the log messages are appearing again.

Additionally, I later found another Security exception and was able to fix it by following the instructions on this post in another thread.

How to check for registry value using VbScript

 
   function readFromRegistry (strRegistryKey, strDefault )
    Dim WSHShell, value

    On Error Resume Next
    Set WSHShell = CreateObject("WScript.Shell")
    value = WSHShell.RegRead( strRegistryKey )

    if err.number <> 0 then
        readFromRegistry= strDefault
    else
        readFromRegistry=value
    end if

    set WSHShell = nothing
end function

Usage : 

str = readfromRegistry("HKEY_LOCAL_MACHINE\SOFTWARE\Adobe\ESD\Install_Dir", "ha")
wscript.echo "returned " & str

Original post

How can I validate google reCAPTCHA v2 using javascript/jQuery?

If you render the Recaptcha on a callback

<script src="https://www.google.com/recaptcha/api.js?onload=onloadCallback&render=explicit" async defer></script>

using an empty DIV as a placeholder

<div id='html_element'></div>

then you can specify an optional function call on a successful CAPTCHA response

var onloadCallback = function() {
    grecaptcha.render('html_element', {
      'sitekey' : 'your_site_key',
      'callback' : correctCaptcha
    });
  };

The recaptcha response will then be sent to the 'correctCaptcha' function.

var correctCaptcha = function(response) {
    alert(response);
};

All of this was from the Google API notes :

Google Recaptcha v2 API Notes

I'm a bit unsure why you would want to do this. Normally you would send the g-recaptcha-response field along with your Private key to safely validate server-side. Unless you wanted to disable the submit button until the recaptcha was sucessful or such - in which case the above should work.

Hope this helps.

Paul

Difference between <input type='button' /> and <input type='submit' />

<input type="button" /> buttons will not submit a form - they don't do anything by default. They're generally used in conjunction with JavaScript as part of an AJAX application.

<input type="submit"> buttons will submit the form they are in when the user clicks on them, unless you specify otherwise with JavaScript.

Cache an HTTP 'Get' service response in AngularJS?

I think there's an even easier way now. This enables basic caching for all $http requests (which $resource inherits):

 var app = angular.module('myApp',[])
      .config(['$httpProvider', function ($httpProvider) {
            // enable http caching
           $httpProvider.defaults.cache = true;
      }])

top -c command in linux to filter processes listed based on processname

You can add filters to top while it is running, just press the o key and then type in a filter expression. For example, to monitor all java processes use the filter expression COMMAND=java. You can add multiple filters by pressing the key again, you can filter by user with the u key, and you can clear all filters with the = key.

How to Write text file Java

It's not creating a file because you never actually created the file. You made an object for it. Creating an instance doesn't create the file.

File newFile = new File("directory", "fileName.txt");

You can do this to make a file:

newFile.createNewFile();

You can do this to make a folder:

newFile.mkdir();

jQuery object equality

It is, generally speaking, a bad idea to compare $(foo) with $(foo) as that is functionally equivalent to the following comparison:

<html>
<head>
<script language='javascript'>
    function foo(bar) {
        return ({ "object": bar });
    }

    $ = foo;

    if ( $("a") == $("a") ) {
        alert ("JS engine screw-up");
    }
    else {
        alert ("Expected result");
    }

</script>

</head>
</html>

Of course you would never expect "JS engine screw-up". I use "$" just to make it clear what jQuery is doing.

Whenever you call $("#foo") you are actually doing a jQuery("#foo") which returns a new object. So comparing them and expecting same object is not correct.

However what you CAN do may be is something like:

<html>
<head>
<script language='javascript'>
    function foo(bar) {
        return ({ "object": bar });
    }

    $ = foo;

    if ( $("a").object == $("a").object ) {
        alert ("Yep! Now it works");
    }
    else {
        alert ("This should not happen");
    }

</script>

</head>
</html>

So really you should perhaps compare the ID elements of the jQuery objects in your real program so something like

... 
$(someIdSelector).attr("id") == $(someOtherIdSelector).attr("id")

is more appropriate.

android : Error converting byte to dex

Thing that worked for me.

  1. Go to android folder of your app.
  2. Run ./gradlew clean

How to avoid page refresh after button click event in asp.net

I think I also have this problem, I was trying to make calendar visible after clicking a button but the page keeps refreshing after clicking the button

MaintainScrollPositionOnPostBack="true"

This actually answered my problem.

I cant vote or comment, I just joined SO today

Android : change button text and background color

add below line in styles.xml

<style name="AppTheme.Gray" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorButtonNormal">@color/colorGray</item>
    </style>

in button, add android:theme="@style/AppTheme.Gray", example:

<Button
            android:theme="@style/AppTheme.Gray"
            android:textColor="@color/colorWhite"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@android:string/cancel"/>

HTML: Select multiple as dropdown

A similar question was asked here

If you're able to add an external library to your project, you can try Chosen

Here's a sample:

_x000D_
_x000D_ 
$(".chosen-select").chosen({_x000D_
  no_results_text: "Oops, nothing found!"_x000D_
})
_x000D_ 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>_x000D_
<script src="https://cdn.rawgit.com/harvesthq/chosen/gh-pages/chosen.jquery.min.js"></script>_x000D_
<link href="https://cdn.rawgit.com/harvesthq/chosen/gh-pages/chosen.min.css" rel="stylesheet"/>_x000D_
_x000D_
<form action="http://httpbin.org/post" method="post">_x000D_
  <select data-placeholder="Begin typing a name to filter..." multiple class="chosen-select" name="test">_x000D_
    <option value=""></option>_x000D_
    <option>American Black Bear</option>_x000D_
    <option>Asiatic Black Bear</option>_x000D_
    <option>Brown Bear</option>_x000D_
    <option>Giant Panda</option>_x000D_
    <option>Sloth Bear</option>_x000D_
    <option>Sun Bear</option>_x000D_
    <option>Polar Bear</option>_x000D_
    <option>Spectacled Bear</option>_x000D_
  </select>_x000D_
  <input type="submit">_x000D_
</form>
_x000D_
_x000D_
_x000D_

One thing I've run into, you have to include JQuery BEFORE you include Chosen or you'll get errors.

How to get child element by class name?

Here is a relatively simple recursive solution. I think a breadth-first search is appropriate here. This will return the first element matching the class that is found.

function getDescendantWithClass(element, clName) {
    var children = element.childNodes;
    for (var i = 0; i < children.length; i++) {
        if (children[i].className &&
            children[i].className.split(' ').indexOf(clName) >= 0) {
            return children[i];
         }
     }
     for (var i = 0; i < children.length; i++) {
         var match = getDescendantWithClass(children[i], clName);
         if (match !== null) {
             return match;
         }
     }
     return null;
}

SQL Server query to find all current database names

I don't recommend this method... but if you want to go wacky and strange:

EXEC sp_MSForEachDB 'SELECT ''?'' AS DatabaseName'

or

EXEC sp_MSForEachDB 'Print ''?'''

How can I get a specific number child using CSS?

For modern browsers, use td:nth-child(2) for the second td, and td:nth-child(3) for the third. Remember that these retrieve the second and third td for every row.

If you need compatibility with IE older than version 9, use sibling combinators or JavaScript as suggested by Tim. Also see my answer to this related question for an explanation and illustration of his method.

Simplest way to do a recursive self-join?

Using CTEs you can do it this way

DECLARE @Table TABLE(
        PersonID INT,
        Initials VARCHAR(20),
        ParentID INT
)

INSERT INTO @Table SELECT     1,'CJ',NULL
INSERT INTO @Table SELECT     2,'EB',1
INSERT INTO @Table SELECT     3,'MB',1
INSERT INTO @Table SELECT     4,'SW',2
INSERT INTO @Table SELECT     5,'YT',NULL
INSERT INTO @Table SELECT     6,'IS',5

DECLARE @PersonID INT

SELECT @PersonID = 1

;WITH Selects AS (
        SELECT *
        FROM    @Table
        WHERE   PersonID = @PersonID
        UNION ALL
        SELECT  t.*
        FROM    @Table t INNER JOIN
                Selects s ON t.ParentID = s.PersonID
)
SELECT  *
FROm    Selects

How to loop through an associative array and get the key?

While arguably being less clear this method is faster by roughly a factor of roughly 3.5 (At least on the box I used to test)

$foo = array(
    1 => "Value1",
    2 => "Value2",
    10 => "Value10"
);
while($bar = each($foo)){
    echo $bar[0] . " => " . $bar[1];
}

I would imagine that this is due to the fact the foreach copies the entire array before iterating over it.

$.browser is undefined error

The .browser call has been removed in jquery 1.9 have a look at http://jquery.com/upgrade-guide/1.9/ for more details.

How to write an ArrayList of Strings into a text file?

You can do that with a single line of code nowadays. Create the arrayList and the Path object representing the file where you want to write into:

Path out = Paths.get("output.txt");
List<String> arrayList = new ArrayList<> ( Arrays.asList ( "a" , "b" , "c" ) );

Create the actual file, and fill it with the text in the ArrayList: 

Files.write(out,arrayList,Charset.defaultCharset());

OkHttp Post Body as JSON

In okhttp v4.* I got it working that way


// import the extensions!
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.RequestBody.Companion.toRequestBody

// ...

json : String = "..."

val JSON : MediaType = "application/json; charset=utf-8".toMediaType()
val jsonBody: RequestBody = json.toRequestBody(JSON)

// go on with Request.Builder() etc

What does git push -u mean?

When you push a new branch the first time use: >git push -u origin

After that, you can just type a shorter command: >git push

The first-time -u option created a persistent upstream tracking branch with your local branch.

Spark RDD to DataFrame python

Try if that works

sc = spark.sparkContext

# Infer the schema, and register the DataFrame as a table.
schemaPeople = spark.createDataFrame(RddName)
schemaPeople.createOrReplaceTempView("RddName")

Wait till a Function with animations is finished until running another Function

You can do it via callback function.

$('a.button').click(function(){
    if (condition == 'true'){
        function1(someVariable, function() {
          function2(someOtherVariable);
        });
    }
    else {
        doThis(someVariable);
    }
});

function function1(param, callback) { ...do stuff callback(); }

How to Test Facebook Connect Locally

go to canvas page.. view it in browser.. copy the address bar text. now go to your facebook app go to edit settings

in website, in site url paste that address

in facebook integration , again paste the that address in canvas url

and also the same code wherever you require canvas url or redirect url..

hope it will help..

CSS vertical-align: text-bottom;

Modern solution

Flexbox was created for exactly these kind of problems:

_x000D_
_x000D_ 
#container {_x000D_
    height: 150px;/*Only for the demo.*/_x000D_
    background-color:green;/*Only for the demo.*/_x000D_
    display: flex;_x000D_
    justify-content: center;_x000D_
    align-items: flex-end;_x000D_
}
_x000D_ 
<div id="container">_x000D_
    <span>Text align to center bottom.</span>_x000D_
</div>
_x000D_
_x000D_
_x000D_

Old school solution

If you don't want to mess with table displays, then you can create a <div> inside a relatively positioned parent container, place it to the bottom with absolute positioning, then make it 100% wide, so you can text-align it to the center:

_x000D_
_x000D_ 
#container {_x000D_
    height: 150px;/*Only for the demo.*/_x000D_
    background-color:green;/*Only for the demo.*/_x000D_
    position: relative;_x000D_
}_x000D_
_x000D_
#text {_x000D_
    position: absolute;_x000D_
    bottom: 0;_x000D_
    width: 100%;_x000D_
    text-align: center;_x000D_
}
_x000D_ 
<div id="container">_x000D_
    <span id="text">Text align to center bottom.</span>_x000D_
</div>
_x000D_
_x000D_
_x000D_

How to check if a view controller is presented modally or pushed on a navigation stack?

 
if let navigationController = self.navigationController, navigationController.isBeingPresented {
    // being presented
}else{
    // being pushed
}

php get values from json encode

json_decode() will return an object or array if second value it's true:

$json = '{"countryId":"84","productId":"1","status":"0","opId":"134"}';
$json = json_decode($json, true);
echo $json['countryId'];
echo $json['productId'];
echo $json['status'];
echo $json['opId'];

Pagination on a list using ng-repeat

If you have not too much data, you can definitely do pagination by just storing all the data in the browser and filtering what's visible at a certain time.

Here's a simple pagination example: http://jsfiddle.net/2ZzZB/56/

That example was on the list of fiddles on the angular.js github wiki, which should be helpful: https://github.com/angular/angular.js/wiki/JsFiddle-Examples

EDIT: http://jsfiddle.net/2ZzZB/16/ to http://jsfiddle.net/2ZzZB/56/ (won't show "1/4.5" if there is 45 results)

How do I capture the output into a variable from an external process in PowerShell?

I tried the answers, but in my case I did not get the raw output. Instead it was converted to a PowerShell exception.

The raw result I got with:

$rawOutput = (cmd /c <command> 2`>`&1)

Does my application "contain encryption"?

As of September 20th, 2016, registering is no longer required for apps that use https (or perhaps other forms of encryption): https://web.archive.org/web/20170312060607/https://www.bis.doc.gov/index.php/informationsecurity2016-updates

In fact, on SNAP-R you can no longer choose 'encryption registration': enter image description here

Specifically, they note:

Encryption Registrations no longer required – some of the information from the registration now goes into the Supp. No. 8 to Part 742 report.

This means you may need to send an annual report to BIS, but you don't need to register and you can note when submitting your app that it is exempt.

Pandas column of lists, create a row for each list element

Pandas >= 0.25

Series and DataFrame methods define a .explode() method that explodes lists into separate rows. See the docs section on Exploding a list-like column.

df = pd.DataFrame({
    'var1': [['a', 'b', 'c'], ['d', 'e',], [], np.nan], 
    'var2': [1, 2, 3, 4]
})
df
        var1  var2
0  [a, b, c]     1
1     [d, e]     2
2         []     3
3        NaN     4

df.explode('var1')

  var1  var2
0    a     1
0    b     1
0    c     1
1    d     2
1    e     2
2  NaN     3  # empty list converted to NaN
3  NaN     4  # NaN entry preserved as-is

# to reset the index to be monotonically increasing...
df.explode('var1').reset_index(drop=True)

  var1  var2
0    a     1
1    b     1
2    c     1
3    d     2
4    e     2
5  NaN     3
6  NaN     4

Note that this also handles mixed columns of lists and scalars, as well as empty lists and NaNs appropriately (this is a drawback of repeat-based solutions).

However, you should note that explode only works on a single column (for now).

P.S.: if you are looking to explode a column of strings, you need to split on a separator first, then use explode. See this (very much) related answer by me.

How to link to specific line number on github

@broc.seib has a sophisticated answer, I just want to point out that instead of pressing y to get the permanent link, github now has a very simple UI that helps you to achieve it

  1. Select line by clicking on the line number or select multiple lines by downholding shift(same as how you select multiple folders in file explorer) enter image description here

  2. on the right hand corner of the first line you selected, expand ... and click copy permalink enter image description here

  3. that's it, a link with selected lines and commit hash is copied to your clipboard: https://github.com/python/cpython/blob/c82b7f332aff606af6c9c163da75f1e86514125e/Doc/Makefile#L1-L4

hasOwnProperty in JavaScript

Try this:

function welcomeMessage()
{
    var shape1 = new Shape();
    //alert(shape1.draw());
    alert(shape1.hasOwnProperty("name"));
}

When working with reflection in JavaScript, member objects are always refered to as the name as a string. For example:

for(i in obj) { ... }

The loop iterator i will be hold a string value with the name of the property. To use that in code you have to address the property using the array operator like this:

 for(i in obj) {
   alert("The value of obj." + i + " = " + obj[i]);
 }

PostgreSQL: Why psql can't connect to server?

In my case, the service was running but the cluster was down and psql wouldn't start. My configuration files looked perfect but it kept throwing configuration errors and seemed to ignore the changes I was making.

It turns out that whenever you use ALTER SYSTEM SET ... syntax, PostgreSQL writes to a file called postgresql.auto.conf. That file is read in addition to the regular postgresql.conf and pg_hba.conf files. In my distribution of Ubuntu (18.04), they are in different folders(!):
- pg_hba.conf and postgresql.conf are both in /etc/postgresql/12/main
- The auto-generated file is /var/lib/postgresql/12/main/postgresql.auto.conf

I had tried to change the configuration using ALTER SYSTEM SET listen_addresses = <my-ip>, but had made a mistake and that created a broken "ghost" configuration that I couldn't find. As soon as I erased the offending line in postgresql.auto.conf, it fixed everything.

Referring to the null object in Python

In Python, the 'null' object is the singleton None.

The best way to check things for "Noneness" is to use the identity operator, is:

if foo is None:
    ...

Get java.nio.file.Path object from java.io.File

From the documentation:

Paths associated with the default provider are generally interoperable with the java.io.File class. Paths created by other providers are unlikely to be interoperable with the abstract path names represented by java.io.File. The toPath method may be used to obtain a Path from the abstract path name represented by a java.io.File object. The resulting Path can be used to operate on the same file as the java.io.File object. In addition, the toFile method is useful to construct a File from the String representation of a Path.

(emphasis mine)

So, for toFile:

Returns a File object representing this path.

And toPath:

Returns a java.nio.file.Path object constructed from the this abstract path.

How to set the height and the width of a textfield in Java?

There's a way which maybe not perfect, but can meet your requirement. The main point here is use a special dimension to restrict the height. But at the same time, width actually is free, as the max width is big enough.

package test;
import java.awt.*;
import javax.swing.*;

public final class TestFrame extends Frame{
    public TestFrame(){
        JPanel p = new JPanel();
        p.setLayout(new BoxLayout(p, BoxLayout.X_AXIS));
        p.setPreferredSize(new Dimension(500, 200));
        p.setMaximumSize(new Dimension(10000, 200));
        p.add(new JLabel("TEST: "));

        JPanel p1 = new JPanel();
        p1.setLayout(new BoxLayout(p1, BoxLayout.X_AXIS));
        p1.setMaximumSize(new Dimension(10000, 200));
        p1.add(new JTextField(50));

        p.add(p1);

        this.setLayout(new BorderLayout());
        this.add(p, BorderLayout.CENTER);
    }
    //TODO: GUI CREATE
}

Do subclasses inherit private fields?

Ok, this is a very interesting problem I researched a lot and came to a conclusion that private members of a superclass are indeed available (but not accessible) in the subclass's objects. To prove this, here is a sample code with a parent class and a child class and I am writing child class object to a txt file and reading a private member named 'bhavesh' in the file, hence proving it is indeed available in the child class but not accessible due to the access modifier.

import java.io.Serializable;
public class ParentClass implements Serializable {
public ParentClass() {

}

public int a=32131,b,c;

private int bhavesh=5555,rr,weq,refw;
}

import java.io.*;
import java.io.Serializable;
public class ChildClass extends ParentClass{
public ChildClass() {
super();
}

public static void main(String[] args) {
ChildClass childObj = new ChildClass();
ObjectOutputStream oos;
try {
        oos = new ObjectOutputStream(new FileOutputStream("C:\\MyData1.txt"));
        oos.writeObject(childObj); //Writing child class object and not parent class object
        System.out.println("Writing complete !");
    } catch (IOException e) {
    }


}
}

Open MyData1.txt and search for the private member named 'bhavesh'. Please let me know what you guys think.

Give column name when read csv file pandas

If we are directly use data from csv it will give combine data based on comma separation value as it is .csv file.

user1 = pd.read_csv('dataset/1.csv')

If you want to add column names using pandas, you have to do something like this. But below code will not show separate header for your columns.

col_names=['TIME', 'X', 'Y', 'Z'] 
user1 = pd.read_csv('dataset/1.csv', names=col_names)

To solve above problem we have to add extra filled which is supported by pandas, It is header=None

user1 = pd.read_csv('dataset/1.csv', names=col_names, header=None)

org.hibernate.PersistentObjectException: detached entity passed to persist

This exists in @ManyToOne relation. I solved this issue by just using CascadeType.MERGE instead of CascadeType.PERSIST or CascadeType.ALL. Hope it helps you.

@ManyToOne(cascade = CascadeType.ALL)
@JoinColumn(name="updated_by", referencedColumnName = "id")
private Admin admin;

Solution:

@ManyToOne(cascade = CascadeType.MERGE)
@JoinColumn(name="updated_by", referencedColumnName = "id")
private Admin admin;

How to create a table from select query result in SQL Server 2008

Use following syntax to create new table from old table in SQL server 2008

Select * into new_table  from  old_table

When should I write the keyword 'inline' for a function/method?

You still need to explicitly inline your function when doing template specialization (if specialization is in .h file)

What is the difference between signed and unsigned variables?

Unsigned variables are variables which are internally represented without a mathematical sign (plus or minus) can store 'zero' or positive values only. Let us say the unsigned variable is n bits in size, then it can represent 2^n (2 power n) values - 0 through (2^n -1). A signed variable on the other hand, 'loses' one bit for representing the sign, so it can store values from -(2^(n-1) -1) through (2^(n-1)) including zero. Thus, a signed variable can store positive values, negative values and zero.

P.S.:
Internally, the mathematical sign may be represented in one's complement form, two's complement form or with a sign bit (eg: 0 -> +, 1-> -)
All these methods effectively divide the range of representable values in n bits (2^n) into three parts, positive, negative and zero.

This is just my two cents worth.

I hope this helps.

Custom thread pool in Java 8 parallel stream

Until now, I used the solutions described in the answers of this question. Now, I came up with a little library called Parallel Stream Support for that:

ForkJoinPool pool = new ForkJoinPool(NR_OF_THREADS);
ParallelIntStreamSupport.range(1, 1_000_000, pool)
    .filter(PrimesPrint::isPrime)
    .collect(toList())

But as @PabloMatiasGomez pointed out in the comments, there are drawbacks regarding the splitting mechanism of parallel streams which depends heavily on the size of the common pool. See Parallel stream from a HashSet doesn't run in parallel .

I am using this solution only to have separate pools for different types of work but I can not set the size of the common pool to 1 even if I don't use it.

Difference between Spring MVC and Struts MVC

Spring's Web MVC framework is designed around a DispatcherServlet that dispatches requests to handlers, with configurable handler mappings, view resolution, locale and theme resolution as well as support for upload files. The default handler is a very simple Controller interface, just offering a ModelAndView handleRequest(request,response) method. This can already be used for application controllers, but you will prefer the included implementation hierarchy, consisting of, for example AbstractController, AbstractCommandController and SimpleFormController. Application controllers will typically be subclasses of those. Note that you can choose an appropriate base class: if you don't have a form, you don't need a form controller. This is a major difference to Struts

What's the proper value for a checked attribute of an HTML checkbox?

Strictly speaking, you should put something that makes sense - according to the spec here, the most correct version is:

<input name=name id=id type=checkbox checked=checked>

For HTML, you can also use the empty attribute syntax, checked="", or even simply checked (for stricter XHTML, this is not supported).

Effectively, however, most browsers will support just about any value between the quotes. All of the following will be checked:

<input name=name id=id type=checkbox checked>
<input name=name id=id type=checkbox checked="">
<input name=name id=id type=checkbox checked="yes">
<input name=name id=id type=checkbox checked="blue">
<input name=name id=id type=checkbox checked="false">

And only the following will be unchecked:

<input name=name id=id type=checkbox>

See also this similar question on disabled="disabled".

How do I vertically align text in a div?

 
<!DOCTYPE html>
<html>

  <head>
    <style>
      .container {
        height: 250px;
        background: #f8f8f8;
        display: -ms-flexbox;
        display: -webkit-flex;
        display: flex;
        -ms-flex-align: center;
        align-items: center;
        -webkit-box-align: center;
        justify-content: center;
      }
      p{
        font-size: 24px;
      }
    </style>
  </head>

  <body>
    <div class="container">
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>
    </div>
  </body>

</html>

What is difference between sleep() method and yield() method of multi threading?

Yield : will make thread to wait for the currently executing thread and the thread which has called yield() will attaches itself at the end of the thread execution. The thread which call yield() will be in Blocked state till its turn.

Sleep : will cause the thread to sleep in sleep mode for span of time mentioned in arguments.

Join : t1 and t2 are two threads , t2.join() is called then t1 enters into wait state until t2 completes execution. Then t1 will into runnable state then our specialist JVM thread scheduler will pick t1 based on criteria's.

How to download all dependencies and packages to directory

The marked answer has the problem that the available packages on the machine that is doing the downloads might be different from the target machine, and thus the package set might be incomplete.

To avoid this and get all dependencies, use the following: 

apt-get download $(apt-rdepends <package>|grep -v "^ ")

Some packages returned from apt-rdepends don't exist with the exact name for apt-get download to download (for example, libc-dev). In those cases, filter out those exact names (be sure to use ^<NAME>$ so that other related names, for example libc-dev-bin, that do exist are not skipped).

apt-get download $(apt-rdepends <package>|grep -v "^ " |grep -v "^libc-dev$")

Once downloaded, you can move the .deb files to a machine without Internet and install them:

sudo dpkg -i *.deb

Make flex items take content width, not width of parent container

In addtion to align-self you can also consider auto margin which will do almost the same thing

_x000D_
_x000D_ 
.container {_x000D_
  background: red;_x000D_
  height: 200px;_x000D_
  flex-direction: column;_x000D_
  padding: 10px;_x000D_
  display: flex;_x000D_
}_x000D_
a {_x000D_
  margin-right:auto;_x000D_
  padding: 10px 40px;_x000D_
  background: pink;_x000D_
}
_x000D_ 
<div class="container">_x000D_
  <a href="#">Test</a>_x000D_
</div>
_x000D_
_x000D_
_x000D_

How to catch a specific SqlException error?

If you want list of error messages met in Sql server, you can see with

SELECT *
FROM master.dbo.sysmessages

Wait for a void async method

If you can change the signature of your function to async Task then you can use the code presented here

How can I check if a string contains ANY letters from the alphabet?

You can also do this in addition

import re
string='24234ww'
val = re.search('[a-zA-Z]+',string) 
val[0].isalpha() # returns True if the variable is an alphabet
print(val[0]) # this will print the first instance of the matching value

Also note that if variable val returns None. That means the search did not find a match

Determine device (iPhone, iPod Touch) with iOS

I use this in my app. Up to date as of December 2012.

- (NSString *) platformString {
    // Gets a string with the device model
    size_t size;  
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);  
    char *machine = malloc(size);  
    sysctlbyname("hw.machine", machine, &size, NULL, 0);  
    NSString *platform = [NSString stringWithCString:machine encoding:NSUTF8StringEncoding];  
    free(machine); 

    if ([platform isEqualToString:@"iPhone1,1"])    return @"iPhone 2G";
    if ([platform isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";
    if ([platform isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";
    if ([platform isEqualToString:@"iPhone3,1"])    return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,2"])    return @"iPhone 4";
    if ([platform isEqualToString:@"iPhone3,3"])    return @"iPhone 4 (CDMA)";    
    if ([platform isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";
    if ([platform isEqualToString:@"iPhone5,1"])    return @"iPhone 5";
    if ([platform isEqualToString:@"iPhone5,2"])    return @"iPhone 5 (GSM+CDMA)";

    if ([platform isEqualToString:@"iPod1,1"])      return @"iPod Touch (1 Gen)";
    if ([platform isEqualToString:@"iPod2,1"])      return @"iPod Touch (2 Gen)";
    if ([platform isEqualToString:@"iPod3,1"])      return @"iPod Touch (3 Gen)";
    if ([platform isEqualToString:@"iPod4,1"])      return @"iPod Touch (4 Gen)";
    if ([platform isEqualToString:@"iPod5,1"])      return @"iPod Touch (5 Gen)";

    if ([platform isEqualToString:@"iPad1,1"])      return @"iPad";
    if ([platform isEqualToString:@"iPad1,2"])      return @"iPad 3G";
    if ([platform isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";
    if ([platform isEqualToString:@"iPad2,2"])      return @"iPad 2";
    if ([platform isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";
    if ([platform isEqualToString:@"iPad2,4"])      return @"iPad 2";
    if ([platform isEqualToString:@"iPad2,5"])      return @"iPad Mini (WiFi)";
    if ([platform isEqualToString:@"iPad2,6"])      return @"iPad Mini";
    if ([platform isEqualToString:@"iPad2,7"])      return @"iPad Mini (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,1"])      return @"iPad 3 (WiFi)";
    if ([platform isEqualToString:@"iPad3,2"])      return @"iPad 3 (GSM+CDMA)";
    if ([platform isEqualToString:@"iPad3,3"])      return @"iPad 3";
    if ([platform isEqualToString:@"iPad3,4"])      return @"iPad 4 (WiFi)";
    if ([platform isEqualToString:@"iPad3,5"])      return @"iPad 4";
    if ([platform isEqualToString:@"iPad3,6"])      return @"iPad 4 (GSM+CDMA)";

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

    return platform;
}

Eclipse: The resource is not on the build path of a Java project

You can add the src folder to build path by:

  1. Select Java perspective.
  2. Right click on src folder.
  3. Select Build Path > Use a source folder.

And you are done. Hope this help.

EDIT: Refer to the Eclipse documentation

How can I combine hashes in Perl?

For hash references. You should use curly braces like the following: 

$hash_ref1 = {%$hash_ref1, %$hash_ref2};

and not the suggested answer above using parenthesis: 

$hash_ref1 = ($hash_ref1, $hash_ref2);

Launch a shell command with in a python script, wait for the termination and return to the script

You can use subprocess.Popen. There's a few ways to do it:

import subprocess
cmd = ['/run/myscript', '--arg', 'value']
p = subprocess.Popen(cmd, stdout=subprocess.PIPE)
for line in p.stdout:
    print line
p.wait()
print p.returncode

Or, if you don't care what the external program actually does:

cmd = ['/run/myscript', '--arg', 'value']
subprocess.Popen(cmd).wait()

How to style a clicked button in CSS

If you just want the button to have different styling while the mouse is pressed you can use the :active pseudo class.

.button:active {
}

If on the other hand you want the style to stay after clicking you will have to use javascript.

Show "loading" animation on button click

 
            //do processing
            $(this).attr("label", $(this).text()).text("loading ....").animate({ disabled: true }, 1000, function () {
                //original event call
                $.when($(elm).delay(1000).one("click")).done(function () {//processing finalized
                    $(this).text($(this).attr("label")).animate({ disabled: false }, 1000, function () {
                    })
                });
            });

Compile throws a "User-defined type not defined" error but does not go to the offending line of code

I don't have an answer as to what is actually wrong or to directly fix it.

I can report that exporting all the code and forms, then importing them into a fresh workbook fixed it for me. All the work was recovered, and nothing more needed to be done to get back to work. Since that works, it seems clear that it must be a bug in Excel, or whatever it is would still be missing in the new version.

I do have a possible clue to how this Excel (2007) bug works. It seems to be associated with the removal of a class module (or two). (But not every class module, every time for some reason.) No code was using any part of the removed modules (or the new imported version would not work either). One module had been cut down to nothing but some comments (in hope of removing anything that could be "missing" later) so that there was no code visibly connecting it to any other part of the project. But the error came up shortly after I removed the code module entirely. The error also stopped when the removed (but exported just in case) modules were returned. So for convenience, this project had been packing two unused code modules to avoid this error.

It appears then, that somehow some element of some departed modules remains in the VBA environment, even if nothing is being used from these (there two in this case) class modules anywhere in the project. Consequently, the debug/compile finds that element, and it is no surprise that something is missing because it is. Since the thing that is missing is nowhere in the project there is nothing to highlight so there is a message only and nothing else happens. That would explain the observed behavior.

How to create a generic array in Java?

An easy, albeit messy workaround to this would be to nest a second "holder" class inside of your main class, and use it to hold your data.

public class Whatever<Thing>{
    private class Holder<OtherThing>{
        OtherThing thing;
    }
    public Holder<Thing>[] arrayOfHolders = new Holder<Thing>[10]
}

How to get only the last part of a path in Python?

Here is my approach:

>>> import os
>>> print os.path.basename(
        os.path.dirname('/folderA/folderB/folderC/folderD/test.py'))
folderD
>>> print os.path.basename(
        os.path.dirname('/folderA/folderB/folderC/folderD/'))
folderD
>>> print os.path.basename(
        os.path.dirname('/folderA/folderB/folderC/folderD'))
folderC

Getting checkbox values on submit

What i suggest is , its better to use post than get. here are some difference between post VS get

Some notes on GET requests:

  1. GET requests can be cached
  2. GET requests remain in the browser history
  3. GET requests can be bookmarked
  4. GET requests should never be used when dealing with sensitive data
  5. GET requests have length restrictions
  6. GET requests should be used only to retrieve data

Some notes on POST requests:

  1. POST requests are never cached
  2. POST requests do not remain in the browser history
  3. POST requests cannot be bookmarked
  4. POST requests have no restrictions on data length

HTML Code

            <html>
    <head></head>
    <body>
    <form action="output.php" method="post">
    Red<input type="checkbox" name="color[]" id="color" value="red">
    Green<input type="checkbox" name="color[]" id="color" value="green">
    Blue<input type="checkbox" name="color[]" id="color" value="blue">
    Cyan<input type="checkbox" name="color[]" id="color" value="cyan">
    Magenta<input type="checkbox" name="color[]" id="color" value="Magenta">
    Yellow<input type="checkbox" name="color[]" id="color" value="yellow">
    Black<input type="checkbox" name="color[]" id="color" value="black">
    <input type="submit" value="submit">
    </form>
    <body>
    </html>

PHP code

    <?php


    if(isset($_POST['color'])) {
    $name = $_POST['color'];

    echo "You chose the following color(s): <br>";
    foreach ($name as $color){
    echo $color."<br />";
    }} // end brace for if(isset

    else {

    echo "You did not choose a color.";

    }

    ?>

How to make div appear in front of another?

Use the CSS z-index property. Elements with a greater z-index value are positioned in front of elements with smaller z-index values.

Note that for this to work, you also need to set a position style (position:absolute, position:relative, or position:fixed) on both/all of the elements you want to order.

What's the best practice to "git clone" into an existing folder?

This can be done by cloning to a new directory, then moving the .git directory into your existing directory.

If your existing directory is named "code".

git clone https://myrepo.com/git.git temp
mv temp/.git code/.git
rm -rf temp

This can also be done without doing a checkout during the clone command; more information can be found here.

Adding content to a linear layout dynamically?

In your onCreate(), write the following

LinearLayout myRoot = (LinearLayout) findViewById(R.id.my_root);
LinearLayout a = new LinearLayout(this);
a.setOrientation(LinearLayout.HORIZONTAL);
a.addView(view1);
a.addView(view2);
a.addView(view3);
myRoot.addView(a);

view1, view2 and view3 are your TextViews. They're easily created programmatically.

Removing duplicate characters from a string

 
def dupe(str1):
    s=set(str1)

    return "".join(s)
str1='geeksforgeeks'
a=dupe(str1)
print(a)

works well if order is not important.

Mapping two integers to one, in a unique and deterministic way

Given positive integers A and B, let D = number of digits A has, and E=number of digits B has The result can be a concatenation of D, 0, E, 0, A, and B.

Example: A = 300, B = 12. D = 3, E=2 result = 302030012. This takes advantage of the fact that the only number that starts with 0, is 0,

Pro: Easy to encode, easy to decode, human readable, significant digits can be compared first, potential for compare without calculation, simple error checking.

Cons: Size of results is an issue. But that's ok, why are we storing unbounded integers in a computer anyways.

Tuples( or arrays ) as Dictionary keys in C#

If your consuming code can make do with an IDictionary<> interface, instead of Dictionary, my instinct would have been to use a SortedDictionary<> with a custom array comparer, ie:

class ArrayComparer<T> : IComparer<IList<T>>
    where T : IComparable<T>
{
    public int Compare(IList<T> x, IList<T> y)
    {
        int compare = 0;
        for (int n = 0; n < x.Count && n < y.Count; ++n)
        {
            compare = x[n].CompareTo(y[n]);
        }
        return compare;
    }
}

And create thus (using int[] just for concrete example's sake):

var dictionary = new SortedDictionary<int[], string>(new ArrayComparer<int>());

Drop shadow on a div container?

The most widely compatible way of doing this is likely going to be creating a second div under your auto-suggest box the same size as the box itself, nudged a few pixels down and to the right. You can use JS to create and position it, which shouldn't be terribly difficult if you're using a fairly modern framework.

SELECT using 'CASE' in SQL

This is just the syntax of the case statement, it looks like this. 

SELECT 
  CASE 
    WHEN FRUIT = 'A' THEN 'APPLE' 
    WHEN FRUIT = 'B' THEN 'BANANA'     
  END AS FRUIT
FROM FRUIT_TABLE;

As a reminder remember; no assignment is performed the value becomes the column contents. (If you wanted to assign that to a variable you would put it before the CASE statement).

Refresh/reload the content in Div using jquery/ajax

 
$("#myDiv").load(location.href+" #myDiv>*","");

python how to pad numpy array with zeros

I understand that your main problem is that you need to calculate d=b-a but your arrays have different sizes. There is no need for an intermediate padded c

You can solve this without padding:

import numpy as np

a = np.array([[ 1.,  1.,  1.,  1.,  1.],
              [ 1.,  1.,  1.,  1.,  1.],
              [ 1.,  1.,  1.,  1.,  1.]])

b = np.array([[ 3.,  3.,  3.,  3.,  3.,  3.],
              [ 3.,  3.,  3.,  3.,  3.,  3.],
              [ 3.,  3.,  3.,  3.,  3.,  3.],
              [ 3.,  3.,  3.,  3.,  3.,  3.]])

d = b.copy()
d[:a.shape[0],:a.shape[1]] -=  a

print d

Output:

[[ 2.  2.  2.  2.  2.  3.]
 [ 2.  2.  2.  2.  2.  3.]
 [ 2.  2.  2.  2.  2.  3.]
 [ 3.  3.  3.  3.  3.  3.]]

How to use vim in the terminal?

Run vim from the terminal. For the basics, you're advised to run the command vimtutor.

# On your terminal command line:
$ vim

If you have a specific file to edit, pass it as an argument.

$ vim yourfile.cpp

Likewise, launch the tutorial

$ vimtutor

Postgres user does not exist?

For me This was the solution on macOS ReInstall the psql

brew install postgres

Start PostgreSQL server

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

Initialize DB

initdb /usr/local/var/postgres

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

rm -r /usr/local/var/postgres

Create a new database

createdb postgres_test
psql -W postegres_test

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

How can I find the latitude and longitude from address?

 
Geocoder coder = new Geocoder(this);
        List<Address> addresses;
        try {
            addresses = coder.getFromLocationName(address, 5);
            if (addresses == null) {
            }
            Address location = addresses.get(0);
            double lat = location.getLatitude();
            double lng = location.getLongitude();
            Log.i("Lat",""+lat);
            Log.i("Lng",""+lng);
            LatLng latLng = new LatLng(lat,lng);
            MarkerOptions markerOptions = new MarkerOptions();
            markerOptions.position(latLng);
            googleMap.addMarker(markerOptions);
            googleMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng,12));
        } catch (IOException e) {
            e.printStackTrace();
        }

Where does PostgreSQL store the database?

Postgres stores data in files in its data directory. Follow the steps below to go to a database and its files:

The database corresponding to a postgresql table file is a directory. The location of the entire data directory can be obtained by running SHOW data_directory. in a UNIX like OS (eg: Mac) /Library/PostgreSQL/9.4/data Go inside the base folder in the data directory which has all the database folders: /Library/PostgreSQL/9.4/data/base

Find the database folder name by running (Gives an integer. This is the database folder name):

SELECT oid from pg_database WHERE datname = <database_name>;

Find the table file name by running (Gives an integer. This is the file name):

SELECT relname, relfilenode FROM pg_class WHERE relname = <table_name>;

This is a binary file. File details such as size and creation date time can be obtained as usual. For more info read this SO thread

Linq select object from list depending on objects attribute

First, Single throws an exception if there is more than one element satisfying the criteria. Second, your criteria should only check if the Correct property is true. Right now, you are checking if a is equal to a.Correct (which will not even compile).

You should use First (which will throw if there are no such elements), or FirstOrDefault (which will return null for a reference type if there isn't such element):

// this will return the first correct answer,
// or throw an exception if there are no correct answers
var correct = answers.First(a => a.Correct); 

// this will return the first correct answer, 
// or null if there are no correct answers
var correct = answers.FirstOrDefault(a => a.Correct); 

// this will return a list containing all answers which are correct,
// or an empty list if there are no correct answers
var allCorrect = answers.Where(a => a.Correct).ToList();

Failed linking file resources

This might be useful for someone who is looking for a different answer. Go to the Gradle Panel and select your module -> Task -> Verification -> Check. This will check the project for errors and will print the log where the error occurs. Most of the time this Kind of error must be a typo present in your XML file of your project

How to safely upgrade an Amazon EC2 instance from t1.micro to large?

Create AMI -> Boot AMI on large instance.

More info http://docs.amazonwebservices.com/AmazonEC2/gsg/2006-06-26/creating-an-image.html

You can do this all from the admin console too at aws.amazon.com

Where is svn.exe in my machine?

The subversion program code is linked into the TortoiseSVN binary. You can install a compatible discrete version if you need to access the repository from the command line.

UPDATE: Recent versions of the TortoiseSVN package can install a discrete svn.exe in addition to the one linked into the GUI binary. It is located in the same bin directory where the main program is installed. In the installer, the command line tools need to be selected for this: enter image description here

(If you have already installed TortoiseSVN, then rerun the installer and select "Modify") Modify installation

Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays

this.requests=res here you are trying to assign following response to object,

{"headers":{"normalizedNames":{},"lazyUpdate":null},"status":200,"statusText":"OK",
"url":"xyz","ok":true,"type":4,"body":[{}]}

Since, object format is different then response format you have to assign res.body part from your response to get required contents.

How to get the squared symbol (²) to display in a string

Not sure what kind of text box you are refering to. However, I'm not sure if you can do this in a text box on a user form.

A text box on a sheet you can though.

Sheets("Sheet1").Shapes("TextBox 1").TextFrame2.TextRange.Text = "R2=" & variable
Sheets("Sheet1").Shapes("TextBox 1").TextFrame2.TextRange.Characters(2, 1).Font.Superscript = msoTrue

And same thing for an excel cell

Sheets("Sheet1").Range("A1").Characters(2, 1).Font.Superscript = True

If this isn't what you're after you will need to provide more information in your question.

EDIT: posted this after the comment sorry

Linux command to check if a shell script is running or not

I was quite inspired by the last answer by mklement0 - I have few scripts/small programs I run at every reboot via /etc/crontab. I built on his answer and built a login script, which shows if my programs are still running. I execute this scripts.sh via .profile -file on every login, to get instant notification on each login. 

cat scripts.sh 
#!/bin/bash

getscript() {
  pgrep -lf ".[ /]$1( |\$)"
}

script1=keepalive.sh
script2=logger_v3.py

# test if script 1 is running
if getscript "$script1" >/dev/null; then
  echo "$script1" is RUNNING
  else
    echo "$script1" is NOT running
fi

# test if script 2 is running:
if getscript "$script2" >/dev/null; then
  echo "$script2" is RUNNING
  else
    echo "$script2" is NOT running
fi

What is a reasonable length limit on person "Name" fields?

@Ian Nelson: I'm wondering if others see the problem there.

Let's say you have split fields. That's 70 characters total, 35 for first name and 35 for last name. However, if you have one field, you neglect the space that separates first and last names, short changing you by 1 character. Sure, it's "only" one character, but that could make the difference between someone entering their full name and someone not. Therefore, I would change that suggestion to "35 characters for each of Given Name and Family Name, or 71 characters for a single field to hold the Full Name".

C# An established connection was aborted by the software in your host machine

An established connection was aborted by the software in your host machine

That is a boiler-plate error message, it comes out of Windows. The underlying error code is WSAECONNABORTED. Which really doesn't mean more than "connection was aborted". You have to be a bit careful about the "your host machine" part of the phrase. In the vast majority of Windows application programs, it is indeed the host that the desktop app is connected to that aborted the connection. Usually a server somewhere else.

The roles are reversed however when you implement your own server. Now you need to read the error message as "aborted by the application at the other end of the wire". Which is of course not uncommon when you implement a server, client programs that use your server are not unlikely to abort a connection for whatever reason. It can mean that a fire-wall or a proxy terminated the connection but that's not very likely since they typically would not allow the connection to be established in the first place.

You don't really know why a connection was aborted unless you have insight what is going on at the other end of the wire. That's of course hard to come by. If your server is reachable through the Internet then don't discount the possibility that you are being probed by a port scanner. Or your customers, looking for a game cheat.

How to install gem from GitHub source?

On a fresh Linux machine you also need to install git. Bundle uses it behind the scenes.

Check if a given key already exists in a dictionary and increment it

To answer the question "how can I find out if a given index in that dict has already been set to a non-None value", I would prefer this:

try:
  nonNone = my_dict[key] is not None
except KeyError:
  nonNone = False

This conforms to the already invoked concept of EAFP (easier to ask forgiveness then permission). It also avoids the duplicate key lookup in the dictionary as it would in key in my_dict and my_dict[key] is not None what is interesting if lookup is expensive.

For the actual problem that you have posed, i.e. incrementing an int if it exists, or setting it to a default value otherwise, I also recommend the

my_dict[key] = my_dict.get(key, default) + 1

as in the answer of Andrew Wilkinson.

There is a third solution if you are storing modifyable objects in your dictionary. A common example for this is a multimap, where you store a list of elements for your keys. In that case, you can use:

my_dict.setdefault(key, []).append(item)

If a value for key does not exist in the dictionary, the setdefault method will set it to the second parameter of setdefault. It behaves just like a standard my_dict[key], returning the value for the key (which may be the newly set value).

Mockito test a void method throws an exception

The parentheses are poorly placed.

You need to use:

doThrow(new Exception()).when(mockedObject).methodReturningVoid(...);
                                          ^

and NOT use:

doThrow(new Exception()).when(mockedObject.methodReturningVoid(...));
                                                                   ^

This is explained in the documentation

Appending output of a Batch file To log file

This is not an answer to your original question: "Appending output of a Batch file To log file?"

For reference, it's an answer to your followup question: "What lines should i add to my batch file which will make it execute after every 30mins?"

(But I would take Jon Skeet's advice: "You probably shouldn't do that in your batch file - instead, use Task Scheduler.")

Timeout:

Example (1 second):

TIMEOUT /T 1000 /NOBREAK

Sleep:

Example (1 second):

sleep -m 1000

Alternative methods:

Here's an answer to your 2nd followup question: "Along with the Timestamp?"

Create a date and time stamp in your batch files

Example:

echo *** Date: %DATE:/=-% and Time:%TIME::=-% *** >> output.log

How to replace text in a column of a Pandas dataframe?

If you only need to replace characters in one specific column, somehow regex=True and in place=True all failed, I think this way will work:

data["column_name"] = data["column_name"].apply(lambda x: x.replace("characters_need_to_replace", "new_characters"))

lambda is more like a function that works like a for loop in this scenario. x here represents every one of the entries in the current column.

The only thing you need to do is to change the "column_name", "characters_need_to_replace" and "new_characters".

Get current time in seconds since the Epoch on Linux, Bash

Pure bash solution

Since bash 5.0 (released on 7 Jan 2019) you can use the built-in variable EPOCHSECONDS.

$ echo $EPOCHSECONDS
1547624774

There is also EPOCHREALTIME which includes fractions of seconds.

$ echo $EPOCHREALTIME
1547624774.371215

EPOCHREALTIME can be converted to micro-seconds (µs) by removing the decimal point. This might be of interest when using bash's built-in arithmetic (( expression )) which can only handle integers. 

$ echo ${EPOCHREALTIME/./}
1547624774371215

In all examples from above the printed time values are equal for better readability. In reality the time values would differ since each command takes a small amount of time to be executed.

How to speed up insertion performance in PostgreSQL

I encountered this insertion performance problem as well. My solution is spawn some go routines to finish the insertion work. In the meantime, SetMaxOpenConns should be given a proper number otherwise too many open connection error would be alerted. 

db, _ := sql.open() 
db.SetMaxOpenConns(SOME CONFIG INTEGER NUMBER) 
var wg sync.WaitGroup
for _, query := range queries {
    wg.Add(1)
    go func(msg string) {
        defer wg.Done()
        _, err := db.Exec(msg)
        if err != nil {
            fmt.Println(err)
        }
    }(query)
}
wg.Wait()

The loading speed is much faster for my project. This code snippet just gave an idea how it works. Readers should be able to modify it easily.

Convert char array to a int number in C

So, the idea is to convert character numbers (in single quotes, e.g. '8') to integer expression. For instance char c = '8'; int i = c - '0' //would yield integer 8; And sum up all the converted numbers by the principle that 908=9*100+0*10+8, which is done in a loop.

char t[5] = {'-', '9', '0', '8', '\0'}; //Should be terminated properly.

int s = 1;
int i = -1;
int res = 0;

if (c[0] == '-') {
  s = -1;
  i = 0;
}

while (c[++i] != '\0') { //iterate until the array end
  res = res*10 + (c[i] - '0'); //generating the integer according to read parsed numbers.
}

res = res*s; //answer: -908

Importing data from a JSON file into R

An alternative package is RJSONIO. To convert a nested list, lapply can help:

l <- fromJSON('[{"winner":"68694999",  "votes":[ 
   {"ts":"Thu Mar 25 03:13:01 UTC 2010", "user":{"name":"Lamur","user_id":"68694999"}},   
   {"ts":"Thu Mar 25 03:13:08 UTC 2010", "user":{"name":"Lamur","user_id":"68694999"}}],   
  "lastVote":{"timestamp":1269486788526,"user":
   {"name":"Lamur","user_id":"68694999"}},"startPrice":0}]'
)
m <- lapply(
    l[[1]]$votes, 
    function(x) c(x$user['name'], x$user['user_id'], x['ts'])
)
m <- do.call(rbind, m)

gives information on the votes in your example.

remove borders around html input

In my case I am using a CSS framework which adds box-shadow, so I had to also add 

box-shadow: none;

So the complete snippet is:

border: none; 
border-width: 0; 
box-shadow: none;

How can I retrieve Id of inserted entity using Entity framework?

You have to set the property of StoreGeneratedPattern to identity and then try your own code.

Or else you can also use this.

using (var context = new MyContext())
{
  context.MyEntities.AddObject(myNewObject);
  context.SaveChanges();

  int id = myNewObject.Id; // Your Identity column ID
}

How do I pass a value from a child back to the parent form?

Well I have just come across the same problem here - maybe a bit different. However, I think this is how I solved it:

  1. in my parent form I declared the child form without instance e.g. RefDateSelect myDateFrm; So this is available to my other methods within this class/ form

  2. next, a method displays the child by new instance:

    myDateFrm = new RefDateSelect();
myDateFrm.MdiParent = this;
myDateFrm.Show();
myDateFrm.Focus();

  3. my third method (which wants the results from child) can come at any time & simply get results: 

    PDateEnd = myDateFrm.JustGetDateEnd();
pDateStart = myDateFrm.JustGetDateStart();`

    Note: the child methods JustGetDateStart() are public within CHILD as:

    public DateTime JustGetDateStart()
{
    return DateTime.Parse(this.dtpStart.EditValue.ToString());
}

I hope this helps.

How can I divide one column of a data frame through another?

Hadley Wickham

dplyr

packages is always a saver in case of data wrangling. To add the desired division as a third variable I would use mutate()

d <- mutate(d, new = min / count2.freq)

What is the difference between Trap and Interrupt?

Generally speaking, terms like exceptions, faults, aborts, Traps, and Interrupts all mean the same thing and are called "Interrupts".

Coming to the difference between Trap and Interrupt:

Trap: Is a programmer initiated and expected transfer of control to a special handler routine. (For ex: 80x86 INT instruction is a good example)

Where as

Interrupt(Hardware): Is a program control interruption based on an external hardware event external to the CPU (For ex: Pressing a key on the keyboard or a time out on a timer chip)

How to create file execute mode permissions in Git on Windows?

Indeed, it would be nice if git-add had a --mode flag

git 2.9.x/2.10 (Q3 2016) actually will allow that (thanks to Edward Thomson):

git add --chmod=+x -- afile
git commit -m"Executable!"

That makes the all process quicker, and works even if core.filemode is set to false.

See commit 4e55ed3 (31 May 2016) by Edward Thomson (ethomson).
Helped-by: Johannes Schindelin (dscho).
(Merged by Junio C Hamano -- gitster -- in commit c8b080a, 06 Jul 2016)

add: add --chmod=+x / --chmod=-x options

The executable bit will not be detected (and therefore will not be set) for paths in a repository with core.filemode set to false, though the users may still wish to add files as executable for compatibility with other users who do have core.filemode functionality.
For example, Windows users adding shell scripts may wish to add them as executable for compatibility with users on non-Windows.

Although this can be done with a plumbing command (git update-index --add --chmod=+x foo), teaching the git-add command allows users to set a file executable with a command that they're already familiar with.

Why can a function modify some arguments as perceived by the caller, but not others?

If the functions are re-written with completely different variables and we call id on them, it then illustrates the point well. I didn't get this at first and read jfs' post with the great explanation, so I tried to understand/convince myself:

def f(y, z):
    y = 2
    z.append(4)
    print ('In f():             ', id(y), id(z))

def main():
    n = 1
    x = [0,1,2,3]
    print ('Before in main:', n, x,id(n),id(x))
    f(n, x)
    print ('After in main:', n, x,id(n),id(x))

main()
Before in main: 1 [0, 1, 2, 3]   94635800628352 139808499830024
In f():                          94635800628384 139808499830024
After in main: 1 [0, 1, 2, 3, 4] 94635800628352 139808499830024

z and x have the same id. Just different tags for the same underlying structure as the article says.

How can I run multiple npm scripts in parallel?

I have a crossplatform solution without any additional modules. I was looking for something like a try catch block I could use both in the cmd.exe and in the bash.

The solution is command1 || command2 which seems to work in both enviroments same. So the solution for the OP is:

"scripts": {
  "start-watch": "nodemon run-babel index.js",
  "wp-server": "webpack-dev-server",
  // first command is for the cmd.exe, second one is for the bash
  "dev": "(start npm run start-watch && start npm run wp-server) || (npm run start-watch & npm run wp-server)",
  "start": "npm run dev"
}

Then simple npm start (and npm run dev) will work on all platforms!

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

I would use the translate method without translation table. It deletes the letters in second argument in recent Python versions.

def remove_chars(line):
    line7=line[7].translate(None,'abcd')
    return line[:7]+[line7]+line[8:]

line= ['ad','da','sdf','asd',
        '3424','342sfas','asdfaf','sdfa',
        'afase']
print line[7]
line = remove_chars(line)
print line[7]