How can I get Eclipse to show .* files?

Cory is correct

@ If you're using Eclipse PDT, this is done by opening up the PHP explorer view

I just spent about half an hour looking for the little arrow, until I actually looked up what the 'PHP Explorer' view is. Here is a screenshot:

PHP perspective edit image

What's the best way to identify hidden characters in the result of a query in SQL Server (Query Analyzer)?

Create a function that addresses all the whitespace possibilites and enable only those that seem appropriate:

SELECT dbo.ShowWhiteSpace(myfield) from mytable

Uncomment only those whitespace cases you want to test for:


CREATE FUNCTION dbo.ShowWhiteSpace (@str varchar(8000))
RETURNS varchar(8000)
AS
BEGIN
     DECLARE @ShowWhiteSpace varchar(8000);
     SET @ShowWhiteSpace = @str
     SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(32), '[?]')
     SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(13), '[CR]')
     SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(10), '[LF]')
     SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(9),  '[TAB]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(1),  '[SOH]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(2),  '[STX]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(3),  '[ETX]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(4),  '[EOT]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(5),  '[ENQ]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(6),  '[ACK]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(7),  '[BEL]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(8),  '[BS]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(11), '[VT]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(12), '[FF]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(14), '[SO]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(15), '[SI]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(16), '[DLE]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(17), '[DC1]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(18), '[DC2]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(19), '[DC3]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(20), '[DC4]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(21), '[NAK]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(22), '[SYN]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(23), '[ETB]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(24), '[CAN]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(25), '[EM]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(26), '[SUB]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(27), '[ESC]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(28), '[FS]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(29), '[GS]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(30), '[RS]')
--   SET @ShowWhiteSpace = REPLACE( @ShowWhiteSpace, CHAR(31), '[US]')
     RETURN(@ShowWhiteSpace)
END

Windows batch script to unhide files hidden by virus

Try this one. Hope this is working fine.. :)

@ECHO off

cls

ECHO.

set drvltr=

set /p drvltr=Enter Drive letter: 

attrib -s -h -a /s /d  %drvltr%:\*.*

ECHO Unhide Completed

pause

Hidden property of a button in HTML

<html>
<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
<script>

function showButtons () { $('#b1, #b2, #b3').show(); }

</script>
<style type="text/css">
#b1, #b2, #b3 {
display: none;
}

</style>
</head>
<body>

<a href="#" onclick="showButtons();">Show me the money!</a>

<input type="submit" id="b1" value="B1" />
<input type="submit" id="b2" value="B2"/>
<input type="submit" id="b3" value="B3" />

</body>
</html>

Making a button invisible by clicking another button in HTML

Using jQuery!

var demoShow = function(){
    $("#p2").hide();
}

But I would recommend you give an id to your button on which you want an action to happen. For example:

<input type="button" id="p1" value="edit" />
<input type="button" id="p2" value="submit" name="submit" />

<script type="text/javascript"> 
$("#p1").click(function(){
    $("#p2").hide();
});
</script>

To show it again you can simply write: $("#p2").show();

Check div is hidden using jquery

Try

if($('#car2').is(':hidden'))
{  
    alert('car 2 is hidden');       
}

How do you create a hidden div that doesn't create a line break or horizontal space?

To prevent the checkbox from taking up any space without removing it from the DOM, use hidden.

<div hidden id="divCheckbox">

To prevent the checkbox from taking up any space and also removing it from the DOM, use display: none.

<div id="divCheckbox" style="display:none">

Make one div visible and another invisible

You can use the display property of style. Intialy set the result section style as

style = "display:none"

Then the div will not be visible and there won't be any white space.

Once the search results are being populated change the display property using the java script like

document.getElementById("someObj").style.display = "block"

Using java script you can make the div invisible

document.getElementById("someObj").style.display = "none"

How to get current formatted date dd/mm/yyyy in Javascript and append it to an input

Use the DOM's getElementByid method:

document.getElementById("DATE").value = "your date";

A date can be made with the Date class:

d = new Date();

(Protip: install a javascript console such as in Chrome or Firefox' Firebug extension. It enables you to play with the DOM and Javascript)

Make child visible outside an overflow:hidden parent

You can use the clearfix to do "layout preserving" the same way overflow: hidden does.

.clearfix:before,
.clearfix:after {
    content: ".";    
    display: block;    
    height: 0;    
    overflow: hidden; 
}
.clearfix:after { clear: both; }
.clearfix { zoom: 1; } /* IE < 8 */

add class="clearfix" class to the parent, and remove overflow: hidden;

bootstrap 4 responsive utilities visible / hidden xs sm lg not working

Screen Size Class

Hidden on all .d-none
Hidden only on xs .d-none .d-sm-block
Hidden only on sm .d-sm-none .d-md-block
Hidden only on md .d-md-none .d-lg-block
Hidden only on lg .d-lg-none .d-xl-block
Hidden only on xl .d-xl-none
Visible on all .d-block
Visible only on xs .d-block .d-sm-none
Visible only on sm .d-none .d-sm-block .d-md-none
Visible only on md .d-none .d-md-block .d-lg-none
Visible only on lg .d-none .d-lg-block .d-xl-none
Visible only on xl .d-none .d-xl-block

Refer this link http://getbootstrap.com/docs/4.0/utilities/display/#hiding-elements

4.5 link: https://getbootstrap.com/docs/4.5/utilities/display/#hiding-elements

posting hidden value

Maybe a little late to the party but why don't you use sessions to store your data?

bookingfacilities.php

session_start();
$_SESSION['form_date'] = $date;

successfulbooking.php

session_start();
$date = $_SESSION['form_date'];

Nobody will see this.

jQuery - Detect value change on hidden input field

So this is way late, but I've discovered an answer, in case it becomes useful to anyone who comes across this thread.

Changes in value to hidden elements don't automatically fire the .change() event. So, wherever it is that you're setting that value, you also have to tell jQuery to trigger it.

function setUserID(myValue) {
     $('#userid').val(myValue)
                 .trigger('change');
}

Once that's the case,

$('#userid').change(function(){
      //fire your ajax call  
})

should work as expected.

How to use auto-layout to move other views when a view is hidden?

My project uses a custom @IBDesignable subclass of UILabel (to ensure consistency in colour, font, insets etc.) and I have implemented something like the following:

override func intrinsicContentSize() -> CGSize {
    if hidden {
        return CGSizeZero
    } else {
        return super.intrinsicContentSize()
    }
}

This allows the label subclass to take part in Auto Layout, but take no space when hidden.

Is there possibility of sum of ArrayList without looping

Or switch to Groovy, it has a sum() function on a collection. [1,2,3,4,5,6].sum()

http://groovy.codehaus.org/JN1015-Collections

Runs on the same JVM as your java classes.

How to reload .bash_profile from the command line?

alias reload!=". ~/.bash_profile"

or if wanna add logs via functions

function reload! () {
    echo "Reloading bash profile...!"
    source ~/.bash_profile
    echo "Reloaded!!!"
}

How to install ia32-libs in Ubuntu 14.04 LTS (Trusty Tahr)

The problem is that in many cases the packages are multiarch already so the i386 package is not available, but other packages still depend on the i386 package only. This is a problem in the repository, and the managers of the repos should fix it

Saving an Object (Data persistence)

You can use anycache to do the job for you. It considers all the details:

It uses dill as backend, which extends the python pickle module to handle lambda and all the nice python features.
It stores different objects to different files and reloads them properly.
Limits cache size
Allows cache clearing
Allows sharing of objects between multiple runs
Allows respect of input files which influence the result

Assuming you have a function myfunc which creates the instance:

from anycache import anycache

class Company(object):
    def __init__(self, name, value):
        self.name = name
        self.value = value

@anycache(cachedir='/path/to/your/cache')    
def myfunc(name, value)
    return Company(name, value)

Anycache calls myfunc at the first time and pickles the result to a file in cachedir using an unique identifier (depending on the function name and its arguments) as filename. On any consecutive run, the pickled object is loaded. If the cachedir is preserved between python runs, the pickled object is taken from the previous python run.

For any further details see the documentation

How can I check if the array of objects have duplicate property values?

//checking duplicate elements in an array
var arr=[1,3,4,6,8,9,1,3,4,7];
var hp=new Map();
console.log(arr.sort());
var freq=0;
for(var i=1;i<arr.length;i++){
// console.log(arr[i-1]+" "+arr[i]);
if(arr[i]==arr[i-1]){
freq++;

}
else{
hp.set(arr[i-1],freq+1);
freq=0;
}
}
console.log(hp);

There is already an object named in the database

In migration file check the public override void Up() method. May be you are trying to create a new db object which is already in database. So, you need to drop this object/table before creation of the db object. Just do like bellow-

DropTable("dbo.ABC"); 
CreateTable(
            "dbo.ABC",
            c => new
                {
                    Id = c.Int(nullable: false, identity: true),
                    ..
                 }

And now run your migration Update-Database -TargetMigration: "2016_YourMigration"

ScrollIntoView() causing the whole page to move

I had this problem too, and spent many hours trying to deal with it. I hope my resolution may still help some people.

My fix ended up being:

For Chrome: changing .scrollIntoView() to .scrollIntoView({block: 'nearest'}) (thanks to @jfrohn).
For Firefox: apply overflow: -moz-hidden-unscrollable; on the container element that shifts.
Not tested in other browsers.

How do I increment a DOS variable in a FOR /F loop?

Or you can do this without using Delay.

set /a "counter=0"

-> your for loop here

do (
   statement1
   statement2
   call :increaseby1
 )

:increaseby1
set /a "counter+=1"

Bigger Glyphicons

You can just give the glyphicon a font-size to your liking:

span.glyphicon-link {
    font-size: 1.2em;
}

How to get a vCard (.vcf file) into Android contacts from website

What i have also noticed is that you have to save the file as Unicode, UTF-8, no BOM in an Windows format with CRLF (Carriage Return, Line Feed). Because if you don't, the import will break. (Saying something about weird chars in the file)

Good luck :) Sid

Encrypt and decrypt a password in Java

EDIT : this answer is old. Usage of MD5 is now discouraged as it can easily be broken.

MD5 must be good enough for you I imagine? You can achieve it with MessageDigest.

MessageDigest.getInstance("MD5");

There are also other algorithms listed here.

And here's an third party version of it, if you really want: Fast MD5

Android – Listen For Incoming SMS Messages

broadcast implementation on Kotlin:

 private class SmsListener : BroadcastReceiver() {
    override fun onReceive(context: Context?, intent: Intent?) {
        Log.d(TAG, "SMS Received!")

        val txt = getTextFromSms(intent?.extras)
        Log.d(TAG, "message=" + txt)
    }

    private fun getTextFromSms(extras: Bundle?): String {
        val pdus = extras?.get("pdus") as Array<*>
        val format = extras.getString("format")
        var txt = ""
        for (pdu in pdus) {
            val smsmsg = getSmsMsg(pdu as ByteArray?, format)
            val submsg = smsmsg?.displayMessageBody
            submsg?.let { txt = "$txt$it" }
        }
        return txt
    }

    private fun getSmsMsg(pdu: ByteArray?, format: String?): SmsMessage? {
        return when {
            SDK_INT >= Build.VERSION_CODES.M -> SmsMessage.createFromPdu(pdu, format)
            else -> SmsMessage.createFromPdu(pdu)
        }
    }

    companion object {
        private val TAG = SmsListener::class.java.simpleName
    }
}

Note: In your manifest file add the BroadcastReceiver-

<receiver android:name=".listener.SmsListener">
    <intent-filter>
        <action android:name="android.provider.Telephony.SMS_RECEIVED" />
    </intent-filter>
</receiver>

Add this permission:

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

How to connect to local instance of SQL Server 2008 Express

I used (LocalDB)\MSSQLLocalDB as the server name, I was then able to see all the local databases.

Where Is Machine.Config?

C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG

How to get the current plugin directory in WordPress?

This will actually get the result you want:

<?php plugin_dir_url(__FILE__); ?>

http://codex.wordpress.org/Function_Reference/plugin_dir_url

Getting net::ERR_UNKNOWN_URL_SCHEME while calling telephone number from HTML page in Android

I had this issue occurring with mailto: and tel: links inside an iframe (in Chrome, not a webview). Clicking the links would show the grey "page not found" page and inspecting the page showed it had a ERR_UNKNOWN_URL_SCHEME error.

Adding target="_blank", as suggested by this discussion of the issue fixed the problem for me.

Clear a terminal screen for real

None of the answers I read worked in PuTTY, so I found a comment on this article:

In the settings for your connection, under "Window->Behavior" you'll find a setting "System Menu Appears on ALT alone". Then CTRL + L, ALT, l (that's a lower case L) will scroll the screen and then clear the scrollback buffer.

(relevant to the OP because I am connecting to an Ubuntu server, but also apparently relevant no matter what your server is running.)

Why is json_encode adding backslashes?

json_encode will always add slashes.

Check some examples on the manual HERE

This is because if there are some characters which needs to escaped then they will create problem.

To use the json please Parse your json to ensure that the slashes are removed

Well whether or not you remove slashesthe json will be parsed without any problem by eval.

<?php
$array = array('url'=>'http://mysite.com/uploads/gallery/7f/3b/f65ab8165d_logo.jpeg','id'=>54);
?>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script type="text/javascript">
var x = jQuery.parseJSON('<?php echo json_encode($array);?>');
alert(x);
</script>

This is my code and i m able to parse the JSON.

Check your code May be you are missing something while parsing the JSON

How to create streams from string in Node.Js?

Just create a new instance of the stream module and customize it according to your needs:

var Stream = require('stream');
var stream = new Stream();

stream.pipe = function(dest) {
  dest.write('your string');
  return dest;
};

stream.pipe(process.stdout); // in this case the terminal, change to ya-csv

var Stream = require('stream');
var stream = new Stream();

stream.on('data', function(data) {
  process.stdout.write(data); // change process.stdout to ya-csv
});

stream.emit('data', 'this is my string');

How to get a view table query (code) in SQL Server 2008 Management Studio

right-click the view in the object-explorer, select "script view as...", then "create to" and then "new query editor window"

Creating layout constraints programmatically

Regarding your second question about properties, you can use self.myView only if you declared it as a property in class. Since myView is a local variable, you can not use it that way. For more details on this, I would recommend you to go through the apple documentation on Declared Properties,

Forcing anti-aliasing using css: Is this a myth?

I found a fix...

.text {
            font-size: 15px;  /* for firefox */
            *font-size: 90%; /* % restart the antialiasing for ie, note the * hack */
            font-weight: bold; /* needed, don't know why! */
        }

Finish an activity from another activity

That you can do, but I think you should not break the normal flow of activity. If you want to finish you activity then you can simply send a broadcast from your activity B to activity A.

Create a broadcast receiver before starting your activity B:

BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {

    @Override
    public void onReceive(Context arg0, Intent intent) {
        String action = intent.getAction();
        if (action.equals("finish_activity")) {
            finish();
            // DO WHATEVER YOU WANT.
        }
    }
};
registerReceiver(broadcastReceiver, new IntentFilter("finish_activity"));

Send broadcast from activity B to activity A when you want to finish activity A from B

Intent intent = new Intent("finish_activity");
sendBroadcast(intent);

I hope it will work for you...

NuGet behind a proxy

Just a small addition...

If it works for you to only supply the http_proxy setting and not username and password I'd recommend putting the proxy settings in a project local nuget.config file and commit it to source control. That way all team members get the same settings.

Create an empty .\nuget.config

   <?xml version="1.0" encoding="utf-8"?>
   <configuration>
   </configuration>

Then:

   nuget config -Set http_proxy="http://myproxy.example.com:8080" -ConfigFile .\Nuget.Config

And finally commit your new project local Nuget.config file.

HTML inside Twitter Bootstrap popover

You can use the popover event, and control the width by attribute 'data-width'

_x000D_

$('[data-toggle="popover-huongdan"]').popover({ html: true });_x000D_
$('[data-toggle="popover-huongdan"]').on("shown.bs.popover", function () {_x000D_
    var width = $(this).attr("data-width") == undefined ? 276 : parseInt($(this).attr("data-width"));_x000D_
    $("div[id^=popover]").css("max-width", width);_x000D_
});

_x000D_

 <a class="position-absolute" href="javascript:void(0);" data-toggle="popover-huongdan" data-trigger="hover" data-width="500" title="title-popover" data-content="html-content-code">_x000D_
 <i class="far fa-question-circle"></i>_x000D_
 </a>

_x000D_

Embedding a media player in a website using HTML

I found the that either IE or Chrome choked on most of these, or they required external libraries. I just wanted to play an MP3, and I found the page http://www.w3schools.com/html/html_sounds.asp very helpful.

<audio controls>
  <source src="horse.mp3" type="audio/mpeg">
  <embed height="50" width="100" src="horse.mp3">
</audio>

Worked for me in the browsers I tried, but I didn't have some of the old ones around at this time.

Storing and displaying unicode string (??????) using PHP and MySQL

For those who are looking for PHP ( >5.3.5 ) PDO statement, we can set charset as per below:

$dbh = new PDO('mysql:host=localhost;dbname=testdb;charset=utf8', 'username', 'password');

Git says local branch is behind remote branch, but it's not

The solution is very simple and worked for me.

Try this :

git pull --rebase <url>

then

git push -u origin master

Delete an element from a dictionary

d = {1: 2, '2': 3, 5: 7}
del d[5]
print 'd = ', d

Result: d = {1: 2, '2': 3}

Split string to equal length substrings in Java

If you're using Google's guava general-purpose libraries (and quite honestly, any new Java project probably should be), this is insanely trivial with the Splitter class:

for (String substring : Splitter.fixedLength(4).split(inputString)) {
    doSomethingWith(substring);
}

and that's it. Easy as!

What does "publicPath" in Webpack do?

~~the publicPath is just used for dev purpose~~, I was confused at first time I saw this config property, but it makes sense now that I've used webpack for a while

suppose you put all your js source file under src folder, and you config your webpack to build the source file to dist folder with output.path.

But you want to serve your static assets under a more meaningful location like webroot/public/assets, this time you can use out.publicPath='/webroot/public/assets', so that in your html, you can reference your js with <script src="/webroot/public/assets/bundle.js"></script>.

when you request webroot/public/assets/bundle.js the webpack-dev-server will find the js under the dist folder

Update:

thanks for Charlie Martin to correct my answer

original: the publicPath is just used for dev purpose, this is not just for dev purpose

No, this option is useful in the dev server, but its intention is for asynchronously loading script bundles in production. Say you have a very large single page application (for example Facebook). Facebook wouldn't want to serve all of its javascript every time you load the homepage, so it serves only whats needed on the homepage. Then, when you go to your profile, it loads some more javascript for that page with ajax. This option tells it where on your server to load that bundle from

How to install node.js as windows service?

I'm not addressing the question directly, but providing an alternative that might also meet your requirement in a more node.js fashion way.

Functionally the requirements are:

Have the logic (app) running in the background
Be able to start/stop the logic
Automatically start the logic when system boots up

These requirements can be satisfied by using a process manager (PM) and making the process manager start on system startup. Two good PMs that are Windows-friendly are:

PM2
forever

To make the PM start automatically, the most simple way is to create a scheduled task with a "At Startup" trigger:

Transferring files over SSH

You need to specify both source and destination, and if you want to copy directories you should look at the -r option.

So to recursively copy /home/user/whatever from remote server to your current directory:

scp -pr user@remoteserver:whatever .

How to identify and switch to the frame in selenium webdriver when frame does not have id

You can use Css Selector or Xpath:

Approach 1 : CSS Selector

driver.switchTo().frame(driver.findElement(By.cssSelector("iframe[title='Fill Quote']")));

Approach 2 : Xpath

driver.switchTo().frame(driver.findElement(By.xpath("//iframe[@title='Fill Quote']")));

https://seleniumatfingertips.wordpress.com/2016/07/05/handling-frames-in-selenium-webdriver-with-java/

AWS S3: The bucket you are attempting to access must be addressed using the specified endpoint

It seems likely that this bucket was created in a different region, IE not us-west-2. That's the only time I've seen "The bucket you are attempting to access must be addressed using the specified endpoint. Please send all future requests to this endpoint."

US Standard is us-east-1

What does "restore purchases" in In-App purchases mean?

You typically restore purchases with this code:

[[SKPaymentQueue defaultQueue] restoreCompletedTransactions];

It will reinvoke -paymentQueue:updatedTransactions on the observer(s) for the purchased items. This is useful for users who reinstall the app after deletion or install it on a different device.

Not all types of In-App purchases can be restored.

Inserting a PDF file in LaTeX

Use the pdfpages package.

\usepackage{pdfpages}

To include all the pages in the PDF file:

\includepdf[pages=-]{myfile.pdf}

To include just the first page of a PDF:

\includepdf[pages={1}]{myfile.pdf}

Run texdoc pdfpages in a shell to see the complete manual for pdfpages.

How to get some values from a JSON string in C#?

Following code is working for me.

Usings:

using System.IO;
using System.Net;
using Newtonsoft.Json.Linq;

Code:

 using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
                {
                    using (Stream responseStream = response.GetResponseStream())
                    {
                        using (StreamReader responseReader = new StreamReader(responseStream))
                        {
                            string json = responseReader.ReadToEnd();
                            string data = JObject.Parse(json)["id"].ToString();
                        }
                    }
                }

//json = {"kind": "ALL", "id": "1221455", "longUrl": "NewURL"}

How to delete all files from a specific folder?

Try this:

foreach (string file in Directory.GetFiles(@"c:\directory\"))
  File.Delete(file);

How to replace master branch in Git, entirely, from another branch?

You can rename/remove master on remote, but this will be an issue if lots of people have based their work on the remote master branch and have pulled that branch in their local repo.
That might not be the case here since everyone seems to be working on branch 'seotweaks'.

In that case you can:
git remote --show may not work. (Make a git remote show to check how your remote is declared within your local repo. I will assume 'origin')
(Regarding GitHub, house9 comments: "I had to do one additional step, click the 'Admin' button on GitHub and set the 'Default Branch' to something other than 'master', then put it back afterwards")

git branch -m master master-old  # rename master on local
git push origin :master          # delete master on remote
git push origin master-old       # create master-old on remote
git checkout -b master seotweaks # create a new local master on top of seotweaks
git push origin master           # create master on remote

But again:

if other users try to pull while master is deleted on remote, their pulls will fail ("no such ref on remote")
when master is recreated on remote, a pull will attempt to merge that new master on their local (now old) master: lots of conflicts. They actually need to reset --hard their local master to the remote/master branch they will fetch, and forget about their current master.

How can I find the first occurrence of a sub-string in a python string?

to implement this in algorithmic way, by not using any python inbuilt function . This can be implemented as

def find_pos(string,word):

    for i in range(len(string) - len(word)+1):
        if string[i:i+len(word)] == word:
            return i
    return 'Not Found'

string = "the dude is a cool dude"
word = 'dude1'
print(find_pos(string,word))
# output 4

How to resume Fragment from BackStack if exists

Reading the documentation, there is a way to pop the back stack based on either the transaction name or the id provided by commit. Using the name may be easier since it shouldn't require keeping track of a number that may change and reinforces the "unique back stack entry" logic.

Since you want only one back stack entry per Fragment, make the back state name the Fragment's class name (via getClass().getName()). Then when replacing a Fragment, use the popBackStackImmediate() method. If it returns true, it means there is an instance of the Fragment in the back stack. If not, actually execute the Fragment replacement logic.

private void replaceFragment (Fragment fragment){
  String backStateName = fragment.getClass().getName();

  FragmentManager manager = getSupportFragmentManager();
  boolean fragmentPopped = manager.popBackStackImmediate (backStateName, 0);

  if (!fragmentPopped){ //fragment not in back stack, create it.
    FragmentTransaction ft = manager.beginTransaction();
    ft.replace(R.id.content_frame, fragment);
    ft.addToBackStack(backStateName);
    ft.commit();
  }
}

EDIT

The problem is - when i launch A and then B, then press back button, B is removed and A is resumed. and pressing again back button should exit the app. But it is showing a blank window and need another press to close it.

This is because the FragmentTransaction is being added to the back stack to ensure that we can pop the fragments on top later. A quick fix for this is overriding onBackPressed() and finishing the Activity if the back stack contains only 1 Fragment

@Override
public void onBackPressed(){
  if (getSupportFragmentManager().getBackStackEntryCount() == 1){
    finish();
  }
  else {
    super.onBackPressed();
  }
}

Regarding the duplicate back stack entries, your conditional statement that replaces the fragment if it hasn't been popped is clearly different than what my original code snippet's. What you are doing is adding to the back stack regardless of whether or not the back stack was popped.

Something like this should be closer to what you want:

private void replaceFragment (Fragment fragment){
  String backStateName =  fragment.getClass().getName();
  String fragmentTag = backStateName;

  FragmentManager manager = getSupportFragmentManager();
  boolean fragmentPopped = manager.popBackStackImmediate (backStateName, 0);

  if (!fragmentPopped && manager.findFragmentByTag(fragmentTag) == null){ //fragment not in back stack, create it.
    FragmentTransaction ft = manager.beginTransaction();
    ft.replace(R.id.content_frame, fragment, fragmentTag);
    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
    ft.addToBackStack(backStateName);
    ft.commit();
  } 
}

The conditional was changed a bit since selecting the same fragment while it was visible also caused duplicate entries.

Implementation:

I highly suggest not taking the the updated replaceFragment() method apart like you did in your code. All the logic is contained in this method and moving parts around may cause problems.

This means you should copy the updated replaceFragment() method into your class then change

backStateName = fragmentName.getClass().getName();
fragmentPopped = manager.popBackStackImmediate(backStateName, 0);
if (!fragmentPopped) {
            ft.replace(R.id.content_frame, fragmentName);
}
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.addToBackStack(backStateName);
ft.commit();

so it is simply

replaceFragment (fragmentName);

EDIT #2

To update the drawer when the back stack changes, make a method that accepts in a Fragment and compares the class names. If anything matches, change the title and selection. Also add an OnBackStackChangedListener and have it call your update method if there is a valid Fragment.

For example, in the Activity's onCreate(), add

getSupportFragmentManager().addOnBackStackChangedListener(new OnBackStackChangedListener() {

  @Override
  public void onBackStackChanged() {
    Fragment f = getSupportFragmentManager().findFragmentById(R.id.content_frame);
    if (f != null){
      updateTitleAndDrawer (f);
    }

  }
});

And the other method:

private void updateTitleAndDrawer (Fragment fragment){
  String fragClassName = fragment.getClass().getName();

  if (fragClassName.equals(A.class.getName())){
    setTitle ("A");
    //set selected item position, etc
  }
  else if (fragClassName.equals(B.class.getName())){
    setTitle ("B");
    //set selected item position, etc
  }
  else if (fragClassName.equals(C.class.getName())){
    setTitle ("C");
    //set selected item position, etc
  }
}

Now, whenever the back stack changes, the title and checked position will reflect the visible Fragment.

npm global path prefix

Extending your PATH with:

~~export PATH=/usr/local/share/npm/bin:$PATH~~

isn't a terrible idea. Having said that, you shouldn't have to do it.

Run this:

npm config get prefix

The default on OS X is /usr/local, which means that npm will symlink binaries into /usr/local/bin, which should already be on your PATH (especially if you're using Homebrew).

So:

npm config set prefix /usr/local if it's something else, and
Don't use sudo with npm! According to the jslint docs, you should just be able to npm install it.

If you installed npm as sudo (sudo brew install), try reinstalling it with plain ol' brew install. Homebrew is supposed to help keep you sudo-free.

Inheritance and init method in Python

Since you don't call Num.__init__ , the field "n1" never gets created. Call it and then it will be there.

How to Make Laravel Eloquent "IN" Query?

Here is how you do in Eloquent

$users = User::whereIn('id', array(1, 2, 3))->get();

And if you are using Query builder then :

$users = DB::table('users')->whereIn('id', array(1, 2, 3))->get();

How to run a hello.js file in Node.js on windows?

WinXp: I have created a .bat file

node c:\path\to\file\my_program.js

That just run my_program.bat from Explorer or in cmd window

Limiting double to 3 decimal places

If your purpose in truncating the digits is for display reasons, then you just just use an appropriate formatting when you convert the double to a string.

Methods like String.Format() and Console.WriteLine() (and others) allow you to limit the number of digits of precision a value is formatted with.

Attempting to "truncate" floating point numbers is ill advised - floating point numbers don't have a precise decimal representation in many cases. Applying an approach like scaling the number up, truncating it, and then scaling it down could easily change the value to something quite different from what you'd expected for the "truncated" value.

If you need precise decimal representations of a number you should be using decimal rather than double or float.

Load Image from javascript

See this tutorial: Loading images with native JavaScript and handling of events for showing loading spinners

It tells you how to load images with native JavaScript and how to handle events for showing loading spinners. Basically, you create a new Image(); and handle the event correctly then. That should work in all browsers, even in IE7 (maybe even below IE7, but I did not test that...)

Call to a member function on a non-object

you can use 'use' in function like bellow example

function page_properties($objPortal) use($objPage){    
    $objPage->set_page_title($myrow['title']);
}

jQuery delete confirmation box

I used this:

<a href="url/to/delete.asp" onclick="return confirm(' you want to delete?');">Delete</a>

What's the difference between dependencies, devDependencies and peerDependencies in npm package.json file?

Dependencies

These are the packages that your package needs to run, so they will be installed when people run

 npm install PACKAGE-NAME

An example would be if you used jQuery in your project. If someone doesn't have jQuery installed, then it wouldn't work. To save as a dependency, use

 npm install --save

Dev-Dependencies

These are the dependencies that you use in development, but isn't needed when people are using it, so when people run npm install, it won't install them since the are not necessary. For example, if you use mocha to test, people don't need mocha to run, so npm install doesn't install it. To save as a dev dependency, use

npm install PACKAGE --save-dev

Peer Dependencies

These can be used if you want to create and publish your own library so that it can be used as a dependency. For example, if you want your package to be used as a dependency in another project, then these will also be installed when someone installs the project which has your project as a dependency. Most of the time you won't use peer dependencies.

Get keys of a Typescript interface as array of strings

Maybe it's too late, but in version 2.1 of TypeScript you can use key of like this:

interface Person {
    name: string;
    age: number;
    location: string;
}

type K1 = keyof Person; // "name" | "age" | "location"
type K2 = keyof Person[];  // "length" | "push" | "pop" | "concat" | ...
type K3 = keyof { [x: string]: Person };  // string

Source: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-1.html#keyof-and-lookup-types

Check if array is empty or null

You should check for '' (empty string) before pushing into your array. Your array has elements that are empty strings. Then your album_text.length === 0 will work just fine.

Entity Framework Migrations renaming tables and columns

I just tried the same in EF6 (code first entity rename). I simply renamed the class and added a migration using the package manager console and voila, a migration using RenameTable(...) was automatically generated for me. I have to admit that I made sure the only change to the entity was renaming it so no new columns or renamed columns so I cannot be certain if this is an EF6 thing or just that EF was (always) able to detect such simple migrations.

Selecting Multiple Values from a Dropdown List in Google Spreadsheet

You would use data validation for this. Click in the cell you want to have a multiple drop down > DATA > Validation > Criteria (List from a Range) - here you select form a list of items you want in the drop down. And .. you are good. I have included an example to reference.

How do I make an input field accept only letters in javaScript?

function alphaOnly(event) {
  var key = event.keyCode;
  return ((key >= 65 && key <= 90) || key == 8);
};

function lettersOnly(evt) {
       evt = (evt) ? evt : event;
       var charCode = (evt.charCode) ? evt.charCode : ((evt.keyCode) ? evt.keyCode :
          ((evt.which) ? evt.which : 0));
       if (charCode > 31 && (charCode < 65 || charCode > 90) &&
          (charCode < 97 || charCode > 122)) {
          alert("Enter letters only.");
          return false;
       }
       return true;
     }

fopen deprecated warning

If you code is intended for a different OS (like Mac OS X, Linux) you may use following:

#ifdef _WIN32
#define _CRT_SECURE_NO_DEPRECATE
#endif

What's the purpose of SQL keyword "AS"?

There is no difference between both statements above. AS is just a more explicit way of mentioning the alias

Resource interpreted as Document but transferred with MIME type application/json warning in Chrome Developer Tools

This happened to me, and once I removed this: enctype="multipart/form-data" It started working without the warning

How do you clear the console screen in C?

In Windows I have made the mistake of using

system("clear")

but that is actually for Linux

The Windows type is

system("cls")

without #include conio.h

IsNull function in DB2 SQL?

In DB2 there is a function NVL(field, value if null).

Example:

SELECT ID, NVL(NAME, "Internal) AS NAME, NVL(PRICE,0) AS PRICE FROM PRODUCT WITH UR;

Using textures in THREE.js

Use TextureLoader to load a image as texture and then simply apply that texture to scene background.

 new THREE.TextureLoader();
     loader.load('https://images.pexels.com/photos/1205301/pexels-photo-1205301.jpeg' , function(texture)
                {
                 scene.background = texture;  
                });

Result:

https://codepen.io/hiteshsahu/pen/jpGLpq?editors=0011

See the Pen Flat Earth Three.JS by Hitesh Sahu (@hiteshsahu) on CodePen.

How to Alter Constraint

You can not alter constraints ever but you can drop them and then recreate.

Have look on this

ALTER TABLE your_table DROP CONSTRAINT ACTIVEPROG_FKEY1;

and then recreate it with ON DELETE CASCADE like this

ALTER TABLE your_table
add CONSTRAINT ACTIVEPROG_FKEY1 FOREIGN KEY(ActiveProgCode) REFERENCES PROGRAM(ActiveProgCode)
    ON DELETE CASCADE;

hope this help

Zoom to fit: PDF Embedded in HTML

Bit of a late response but I noticed that this information can be hard to find and haven't found the answer on SO, so here it is.

Try a differnt parameter #view=FitH to force it to fit in the horzontal space and also you need to start the querystring off with a # rather than an & making it:

filename.pdf#view=FitH

What I've noticed it is that this will work if adobe reader is embedded in the browser but chrome will use it's own version of the reader and won't respond in the same way. In my own case, the chrome browser zoomed to fit width by default, so no problem , but Internet Explorer needed the above parameters to ensure the link always opened the pdf page with the correct view setting.

For a full list of available parameters see this doc

EDIT: (lazy mode on)

Set JavaScript variable = null, or leave undefined?

The only time you need to set it (or not) is if you need to explicitly check that a variable a is set exactly to null or undefined.

if(a === null) {

}

...is not the same as:

if(a === undefined) {

}

That said, a == null && a == undefined will return true.

Fiddle

How to make CSS width to fill parent?

So after research the following is discovered:

For a div#bar setting display:block; width: auto; causes the equivalent of outerWidth:100%;

For a table#bar you need to wrap it in a div with the rules stated below. So your structure becomes:

<div id="foo">
 <div id="barWrap" style="border....">
  <table id="bar" style="width: 100%; border: 0; padding: 0; margin: 0;">

This way the table takes up the parent div 100%, and #barWrap is used to add borders/margin/padding to the #bar table. Note that you will need to set the background of the whole thing in #barWrap and have #bar's background be transparent or the same as #barWrap.

For textarea#bar and input#bar you need to do the same thing as table#bar, the down side is that by removing the borders you stop native widget rendering of the input/textarea and the #barWrap's borders will look a bit different than everything else, so you will probably have to style all your inputs this way.

jQuery click event on radio button doesn't get fired

There are a couple of things wrong in this code:

You're using <input> the wrong way. You should use a <label> if you want to make the text behind it clickable.
It's setting the enabled attribute, which does not exist. Use disabled instead.
If it would be an attribute, it's value should not be false, use disabled="disabled" or simply disabled without a value.
If checking for someone clicking on a form event that will CHANGE it's value (like check-boxes and radio-buttons), use .change() instead.

I'm not sure what your code is supposed to do. My guess is that you want to disable the input field with class roomNumber once someone selects "Walk in" (and possibly re-enable when deselected). If so, try this code:

HTML:

<form class="type">
    <p>
        <input type="radio" name="type" checked="checked" id="guest" value="guest" />
        <label for="guest">In House</label>
    </p>
    <p>
        <input type="radio" name="type" id="walk_in" value="walk_in" />
        <label for="walk_in">Walk in</label>
    </p>
    <p>
        <input type="text" name="roomnumber" class="roomNumber" value="12345" />
    </p>
</form>

Javascript:

$("form input:radio").change(function () {
    if ($(this).val() == "walk_in") {
        // Disable your roomnumber element here
        $('.roomNumber').attr('disabled', 'disabled');
    } else {
        // Re-enable here I guess
        $('.roomNumber').removeAttr('disabled');
    }
});

I created a fiddle here: http://jsfiddle.net/k28xd/1/

Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array

You can use the following construction:

var arr = [1,2,3,4,5,6,7,8,9,0,5];
var duplicate = arr.filter(function(item, i, arr) {
  return -1 !== arr.indexOf(item, i + 1);
})

How to store image in SQL Server database tables column

Insert Into FEMALE(ID, Image)
Select '1', BulkColumn 
from Openrowset (Bulk 'D:\thepathofimage.jpg', Single_Blob) as Image

You will also need admin rights to run the query.

Remove all child nodes from a parent?

You can use .empty(), like this:

$("#foo").empty();

From the docs:

Remove all child nodes of the set of matched elements from the DOM.

connect to host localhost port 22: Connection refused

It might be caused by some of the following:

SSH Server is not installed (only SSH Client), try: apt-get install ssh openssh-client openssh-server
Connection is blocked by iptables (Firewall), try: ufw allow ssh

Convert Java string to Time, NOT Date

try {

    SimpleDateFormat format = new SimpleDateFormat("hh:mm a"); //if 24 hour format
    // or
    SimpleDateFormat format = new SimpleDateFormat("HH:mm"); // 12 hour format

    java.util.Date d1 =(java.util.Date)format.parse(your_Time);

    java.sql.Time ppstime = new java.sql.Time(d1.getTime());

} catch(Exception e) {

    Log.e("Exception is ", e.toString());
}

jquery : focus to div is not working

a <div> can be focused if it has a tabindex attribute. (the value can be set to -1)

For example:

$("#focus_point").attr("tabindex",-1).focus();

In addition, consider setting outline: none !important; so it displayed without a focus rectangle.

var element = $("#focus_point");
element.css('outline', 'none !important')
       .attr("tabindex", -1)
       .focus();

How to force keyboard with numbers in mobile website in Android

inputmode according to WHATWG spec is the the default method.

For iOS devices adding pattern could also help.

For backward compatibility use type as well since Chrome use these as of version 66.

<input
  inputmode="numeric"
  pattern="[0-9]*"
  type="number"
/>

Why don't Java's +=, -=, *=, /= compound assignment operators require casting?

A good example of this casting is using *= or /=

byte b = 10;
b *= 5.7;
System.out.println(b); // prints 57

byte b = 100;
b /= 2.5;
System.out.println(b); // prints 40

char ch = '0';
ch *= 1.1;
System.out.println(ch); // prints '4'

char ch = 'A';
ch *= 1.5;
System.out.println(ch); // prints 'a'

Renaming files in a folder to sequential numbers

Pero's answer got me here :)

I wanted to rename files relative to time as the image viewers did not display images in time order.

ls -tr *.jpg | # list jpegs relative to time
gawk 'BEGIN{ a=1 }{ printf "mv %s %04d.jpg\n", $0, a++ }' | # build mv command
bash # run that command

Xcode process launch failed: Security

BTW, this also happens if you change the team of your target in Xcode and rebuild. Was quite puzzled to see that problem with an app that I had run on the device before. Took me a while to figure out… Might only happen the first time building to a device with a team, though.

How can I test an AngularJS service from the console?

Angularjs Dependency Injection framework is responsible for injecting the dependancies of you app module to your controllers. This is possible through its injector.

You need to first identify the ng-app and get the associated injector. The below query works to find your ng-app in the DOM and retrieve the injector.

angular.element('*[ng-app]').injector()

In chrome, however, you can point to target ng-app as shown below. and use the $0 hack and issue angular.element($0).injector()

Once you have the injector, get any dependency injected service as below

injector = angular.element($0).injector();
injector.get('$mdToast');

Batch file include external file for variables

Note: I'm assuming Windows batch files as most people seem to be unaware that there are significant differences and just blindly call everything with grey text on black background DOS. Nevertheless, the first variant should work in DOS as well.

Executable configuration

The easiest way to do this is to just put the variables in a batch file themselves, each with its own set statement:

set var1=value1
set var2=value2
...

and in your main batch:

call config.cmd

Of course, that also enables variables to be created conditionally or depending on aspects of the system, so it's pretty versatile. However, arbitrary code can run there and if there is a syntax error, then your main batch will exit too. In the UNIX world this seems to be fairly common, especially for shells. And if you think about it, autoexec.bat is nothing else.

Key/value pairs

Another way would be some kind of var=value pairs in the configuration file:

var1=value1
var2=value2
...

You can then use the following snippet to load them:

for /f "delims=" %%x in (config.txt) do (set "%%x")

This utilizes a similar trick as before, namely just using set on each line. The quotes are there to escape things like <, >, &, |. However, they will themselves break when quotes are used in the input. Also you always need to be careful when further processing data in variables stored with such characters.

Generally, automatically escaping arbitrary input to cause no headaches or problems in batch files seems pretty impossible to me. At least I didn't find a way to do so yet. Of course, with the first solution you're pushing that responsibility to the one writing the config file.

Spring Security redirect to previous page after successful login

I found Utku Özdemir's solution works to some extent, but kind of defeats the purpose of the saved request since the session attribute will take precedence over it. This means that redirects to secure pages will not work as intended - after login you will be sent to the page you were on instead of the redirect target. So as an alternative you could use a modified version of SavedRequestAwareAuthenticationSuccessHandler instead of extending it. This will allow you to have better control over when to use the session attribute.

Here is an example:

private static class MyCustomLoginSuccessHandler extends SimpleUrlAuthenticationSuccessHandler {

    private RequestCache requestCache = new HttpSessionRequestCache();

    @Override
    public void onAuthenticationSuccess(HttpServletRequest request, HttpServletResponse response,
            Authentication authentication) throws ServletException, IOException {
        SavedRequest savedRequest = requestCache.getRequest(request, response);

        if (savedRequest == null) {
            HttpSession session = request.getSession();
            if (session != null) {
                String redirectUrl = (String) session.getAttribute("url_prior_login");
                if (redirectUrl != null) {
                    session.removeAttribute("url_prior_login");
                    getRedirectStrategy().sendRedirect(request, response, redirectUrl);
                } else {
                    super.onAuthenticationSuccess(request, response, authentication);
                }
            } else {
                super.onAuthenticationSuccess(request, response, authentication);
            }

            return;
        }

        String targetUrlParameter = getTargetUrlParameter();
        if (isAlwaysUseDefaultTargetUrl()
                || (targetUrlParameter != null && StringUtils.hasText(request.getParameter(targetUrlParameter)))) {
            requestCache.removeRequest(request, response);
            super.onAuthenticationSuccess(request, response, authentication);

            return;
        }

        clearAuthenticationAttributes(request);

        // Use the DefaultSavedRequest URL
        String targetUrl = savedRequest.getRedirectUrl();
        logger.debug("Redirecting to DefaultSavedRequest Url: " + targetUrl);
        getRedirectStrategy().sendRedirect(request, response, targetUrl);
    }
}

Also, you don't want to save the referrer when authentication has failed, since the referrer will then be the login page itself. So check for the error param manually or provide a separate RequestMapping like below.

@RequestMapping(value = "/login", params = "error")
public String loginError() {
    // Don't save referrer here!
}

How to round the double value to 2 decimal points?

you can also use this code

public static double roundToDecimals(double d, int c)  
{   
   int temp = (int)(d * Math.pow(10 , c));  
   return ((double)temp)/Math.pow(10 , c);  
}

It gives you control of how many numbers after the point are needed.

d = number to round;   
c = number of decimal places

think it will be helpful

DataColumn Name from DataRow (not DataTable)

You can make it easier in your code (if you're doing this a lot anyway) by using an extension on the DataRow object, like:

static class Extensions
{
    public static string GetColumn(this DataRow Row, int Ordinal)
    {
        return Row.Table.Columns[Ordinal].ColumnName;
    }
}

Then call it using:

string MyColumnName = MyRow.GetColumn(5);

Vertical Alignment of text in a table cell

CSS {vertical-align: top;} or html Attribute {valign="top"}

_x000D_

.table td, 
.table th {
    border: 1px solid #161b21;
    text-align: left;
    padding: 8px;
    width: 250px;
    height: 100px;
    
    /* style for table */
}

.table-body-text {
  vertical-align: top;
}

_x000D_

<table class="table">
    <tr>
      <th valign="top">Title 1</th>
      <th valign="top">Title 2</th>
    </tr>
    <tr>
      <td class="table-body-text">text</td>
      <td class="table-body-text">text</td>
    </tr>
   </table>

_x000D_

For table vertical-align we have 2 options.

is to use css {vertical-align: top;}

another way is to user attribute "valign" and the property should be "top" {valign="top"}

How to get the file extension in PHP?

How about

$ext = array_pop($userfile_extn);

Button Width Match Parent

Using a ListTile also works as well, since a list fills the entire width:

ListTile(
  title: new RaisedButton(...),
),

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

If you have an ES2015 environment (as of this writing: io.js, IE11, Chrome, Firefox, WebKit nightly), then the following will work, and will be fast (viz. O(n)):

function hasDuplicates(array) {
    return (new Set(array)).size !== array.length;
}

If you only need string values in the array, the following will work:

function hasDuplicates(array) {
    var valuesSoFar = Object.create(null);
    for (var i = 0; i < array.length; ++i) {
        var value = array[i];
        if (value in valuesSoFar) {
            return true;
        }
        valuesSoFar[value] = true;
    }
    return false;
}

We use a "hash table" valuesSoFar whose keys are the values we've seen in the array so far. We do a lookup using in to see if that value has been spotted already; if so, we bail out of the loop and return true.

If you need a function that works for more than just string values, the following will work, but isn't as performant; it's O(n²) instead of O(n).

function hasDuplicates(array) {
    var valuesSoFar = [];
    for (var i = 0; i < array.length; ++i) {
        var value = array[i];
        if (valuesSoFar.indexOf(value) !== -1) {
            return true;
        }
        valuesSoFar.push(value);
    }
    return false;
}

The difference is simply that we use an array instead of a hash table for valuesSoFar, since JavaScript "hash tables" (i.e. objects) only have string keys. This means we lose the O(1) lookup time of in, instead getting an O(n) lookup time of indexOf.

Override console.log(); for production

Or if you just want to redefine the behavior of the console (in order to add logs for example) You can do something like that:

// define a new console
var console=(function(oldCons){
    return {
        log: function(text){
            oldCons.log(text);
            // Your code
        },
        info: function (text) {
            oldCons.info(text);
            // Your code
        },
        warn: function (text) {
            oldCons.warn(text);
            // Your code
        },
        error: function (text) {
            oldCons.error(text);
            // Your code
        }
    };
}(window.console));

//Then redefine the old console
window.console = console;

Difference between /res and /assets directories

I know this is old, but just to make it clear, there is an explanation of each in the official android documentation:

from http://developer.android.com/tools/projects/index.html

`assets/`

This is empty. You can use it to store raw asset files. Files that you save here are compiled into an .apk file as-is, and the original filename is preserved. You can navigate this directory in the same way as a typical file system using URIs and read files as a stream of bytes using the AssetManager. For example, this is a good location for textures and game data.

`res/raw/`

For arbitrary raw asset files. Saving asset files here instead of in the assets/ directory only differs in the way that you access them. These files are processed by aapt and must be referenced from the application using a resource identifier in the R class. For example, this is a good place for media, such as MP3 or Ogg files.

Default instance name of SQL Server Express

If you navigate to where you have installed SQLExpress, e.g.

C:\Program Files\Microsoft SQL Server\110\Tools\Binn

You can run SQLLocalDB.exe and get a list of the all instances installed on your machine.

C:\Program Files\Microsoft SQL Server\110\Tools\Binn>SqlLocalDB.exe info
MSSQLLocalDB
ProjectsV12
v11.0

Then you can get further information on the instance.

C:\Program Files\Microsoft SQL Server\110\Tools\Binn>SqlLocalDB.exe info MSSQLLocalDB Name: MSSQLLocalDB
Version: 13.0.1601.5
Shared name:
Owner: Domain\User
Auto-create: Yes
State: Stopped
Last start time: 22/09/2016 10:19:33
Instance pipe name:

What Language is Used To Develop Using Unity

When you build for iPhone in Unity it does Ahead of Time (AOT) compilation of your mono assembly (written in C# or JavaScript) to native ARM code.

The authoring tool also creates a stub xcode project and references that compiled lib. You can add objective C code to this xcode project if there is native stuff you want to do that isn't exposed in Unity's environment yet (e.g. accessing the compass and/or gyroscope).

How do I format a date in Jinja2?

Here's the filter that I ended up using for strftime in Jinja2 and Flask

@app.template_filter('strftime')
def _jinja2_filter_datetime(date, fmt=None):
    date = dateutil.parser.parse(date)
    native = date.replace(tzinfo=None)
    format='%b %d, %Y'
    return native.strftime(format)

And then you use the filter like so:

{{car.date_of_manufacture|strftime}}

search in java ArrayList

Customer findCustomerByid(int id){
    for (int i=0; i<this.customers.size(); i++) {
        Customer customer = this.customers.get(i);
        if (customer.getId() == id){
             return customer;
        }
    }
    return null; // no Customer found with this ID; maybe throw an exception
}

Error Message: Type or namespace definition, or end-of-file expected

This line:

public  object Hours { get; set; }}

Your have a redundand } at the end

Java equivalent to #region in C#

vscode

I use vscode for java and it works pretty much the same as visual studio except you use comments:

//#region name

//code

//#endregion

CMD (command prompt) can't go to the desktop

You need to use the change directory command 'cd' to change directory

cd C:\Users\MyName\Desktop

you can use cd \d to change the drive as well.

link for additional resources http://ss64.com/nt/cd.html

Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

My problem was that I installed mysql successfully and it worked fine.

But one day, the same error occurred.

Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

And no mysql.sock file existed.

This sollution solved my problem and mysql was up and running again:

sudo su -

Run:

systemctl stop mysqld.service
systemctl start mysqld.service
systemctl enable mysqld.service

Test as root:

mysql -u root -p

mysql should now be up and running.

I hope this can help someone else as well.

Pygame mouse clicking detection

I assume your game has a main loop, and all your sprites are in a list called sprites.

In your main loop, get all events, and check for the MOUSEBUTTONDOWN or MOUSEBUTTONUP event.

while ... # your main loop
  # get all events
  ev = pygame.event.get()

  # proceed events
  for event in ev:

    # handle MOUSEBUTTONUP
    if event.type == pygame.MOUSEBUTTONUP:
      pos = pygame.mouse.get_pos()

      # get a list of all sprites that are under the mouse cursor
      clicked_sprites = [s for s in sprites if s.rect.collidepoint(pos)]
      # do something with the clicked sprites...

So basically you have to check for a click on a sprite yourself every iteration of the mainloop. You'll want to use mouse.get_pos() and rect.collidepoint().

Pygame does not offer event driven programming, as e.g. cocos2d does.

Another way would be to check the position of the mouse cursor and the state of the pressed buttons, but this approach has some issues.

if pygame.mouse.get_pressed()[0] and mysprite.rect.collidepoint(pygame.mouse.get_pos()):
  print ("You have opened a chest!")

You'll have to introduce some kind of flag if you handled this case, since otherwise this code will print "You have opened a chest!" every iteration of the main loop.

handled = False

while ... // your loop

  if pygame.mouse.get_pressed()[0] and mysprite.rect.collidepoint(pygame.mouse.get_pos()) and not handled:
    print ("You have opened a chest!")
    handled = pygame.mouse.get_pressed()[0]

Of course you can subclass Sprite and add a method called is_clicked like this:

class MySprite(Sprite):
  ...

  def is_clicked(self):
    return pygame.mouse.get_pressed()[0] and self.rect.collidepoint(pygame.mouse.get_pos())

So, it's better to use the first approach IMHO.

SQL Server String or binary data would be truncated

This error is thrown when the column of a table puts constraint [ mostly length ]. . E.g. if database schema for column myColumn is CHAR(2), then when your call from any of your application to insert value, you must pass String of length two.

The error basically says it; string of length three and above is inconsistent to fit the length restriction specified by database schema. That's why SQL Server warns and throws data loss/ Truncation error.

Home does not contain an export named Home

You can use two ways to resolve this problem, first way that i think it as best way is replace importing segment of your code with bellow one:

import Home from './layouts/Home'

or export your component without default which is called named export like this

import React, { Component } from 'react';

class Home extends Component{
    render(){
        return(
        <p className="App-intro">
          Hello Man
        </p>
        )
    }
} 

export {Home};

Failed to load c++ bson extension

I was unable to solve this

until now. First of all you have to have system packages mentioned by Pradeep Mahdevu. Those are:

xcode-select --install (on a mac)

sudo apt-get install gcc make build-essential (on ubuntu)

Then I've installed node-gyp

npm install -g node-gyp

like datadracer said but npm update also suggested by him is risky. It update all modules, which can be dangerous (sometimes API changes between versions).

I suggest going into node_modules/mongodb/node_modules/bson directory and from there use

node-gyp rebuild

That solved the problem for me.

How to ignore ansible SSH authenticity checking?

Two options - the first, as you said in your own answer, is setting the environment variable ANSIBLE_HOST_KEY_CHECKING to False.

The second way to set it is to put it in an ansible.cfg file, and that's a really useful option because you can either set that globally (at system or user level, in /etc/ansible/ansible.cfg or ~/.ansible.cfg), or in an config file in the same directory as the playbook you are running.

To do that, make an ansible.cfg file in one of those locations, and include this:

[defaults]
host_key_checking = False

You can also set a lot of other handy defaults there, like whether or not to gather facts at the start of a play, whether to merge hashes declared in multiple places or replace one with another, and so on. There's a whole big list of options here in the Ansible docs.

Edit: a note on security.

SSH host key validation is a meaningful security layer for persistent hosts - if you are connecting to the same machine many times, it's valuable to accept the host key locally.

For longer-lived EC2 instances, it would make sense to accept the host key with a task run only once on initial creation of the instance:

  - name: Write the new ec2 instance host key to known hosts
    connection: local
    shell: "ssh-keyscan -H {{ inventory_hostname }} >> ~/.ssh/known_hosts"

There's no security value for checking host keys on instances that you stand up dynamically and remove right after playbook execution, but there is security value in checking host keys for persistent machines. So you should manage host key checking differently per logical environment.

Leave checking enabled by default (in ~/.ansible.cfg)
Disable host key checking in the working directory for playbooks you run against ephemeral instances (./ansible.cfg alongside the playbook for unit tests against vagrant VMs, automation for short-lived ec2 instances)

Convert string with commas to array

Another option using the ES6 is using Spread syntax.

var convertedArray = [..."01234"];

_x000D_

var stringToConvert = "012";_x000D_
var convertedArray  = [...stringToConvert];_x000D_
console.log(convertedArray);

_x000D_

sqlite3.OperationalError: unable to open database file

You need to use full path instead of ~/.

In your case, something like /home/harold/Harold-Server/OmniCloud.db.

IE6/IE7 css border on select element

You'd need a custom-designed select box with CSS and JavaScript. You'd need to make absolutely sure it degrades perfectly to a standard select element should a user have JavaScript disabled.

IMO, it's just not worth the effort. Stick with font stylings within the select to make it close to your site's design; leave the borders, etc., to the box elements.

JavaScript: how to change form action attribute value based on selection?

It's better to use

$('#search-form').setAttribute('action', '/controllerName/actionName');

rather than

$('#search-form').attr('action', '/controllerName/actionName');

So, based on trante's answer we have:

$('#search-form').submit(function() {
    var formAction = $("#selectsearch").val() == "people" ? "user" : "content";
    $("#search-form").setAttribute("action", "/search/" + formAction);
});

Using setAttribute can save you a lot of time potentially.

.gitignore exclude folder but include specific subfolder

my JetBrains IntelliJ IDEA .gitignore configuration, where I need exclude wholde .idea folder except .idea/runConfigurations:

.idea
!.idea/
.idea/*
!.idea/runConfigurations/

see: https://github.com/daggerok/gitignore-idea-runConfigurations

How to display multiple notifications in android

For Kotlin.

 notificationManager.notify(Calendar.getInstance().timeInMillis.toInt(),notificationBuilder.build())

How to execute UNION without sorting? (SQL)

select T.Col1, T.Col2, T.Sort
from 
    (
      select T.Col1,
             T.Col2,
             T.Sort,
             rank() over(partition by T.Col1, T.Col2 order by T.Sort) as rn
      from
          (
            select Col1, Col2, 1 as Sort
            from Table1
            union all
            select Col1, Col2, 2
            from Table2
          ) as T
    ) as T
where T.rn = 1    
order by T.Sort

How to convert JSON data into a Python object

You could try this:

class User(object):
    def __init__(self, name, username, *args, **kwargs):
        self.name = name
        self.username = username

import json
j = json.loads(your_json)
u = User(**j)

Just create a new Object, and pass the parameters as a map.

How to get UTC+0 date in Java 8?

In java8, I would use the Instant class which is already in UTC and is convenient to work with.

import java.time.Instant;

Instant ins = Instant.now();
long ts = ins.toEpochMilli();

Instant ins2 = Instant.ofEpochMilli(ts)

Alternatively, you can use the following:

import java.time.*;

Instant ins = Instant.now(); 

OffsetDateTime odt = ins.atOffset(ZoneOffset.UTC);
ZonedDateTime zdt = ins.atZone(ZoneId.of("UTC"));

Back to Instant

Instant ins4 = Instant.from(odt);

Excel: Use a cell value as a parameter for a SQL query

If you are using microsoft query, you can add "?" to your query...

select name from user where id= ?

that will popup a small window asking for the cell/data/etc when you go back to excel.

In the popup window, you can also select "always use this cell as a parameter" eliminating the need to define that cell every time you refresh your data. This is the easiest option.

postgresql duplicate key violates unique constraint

Intro

I also encountered this problem and the solution proposed by @adamo was basically the right solution. However, I had to invest a lot of time in the details, which is why I am now writing a new answer in order to save this time for others.

Case

My case was as follows: There was a table that was filled with data using an app. Now a new entry had to be inserted manually via SQL. After that the sequence was out of sync and no more records could be inserted via the app.

Solution

As mentioned in the answer from @adamo, the sequence must be synchronized manually. For this purpose the name of the sequence is needed. For Postgres, the name of the sequence can be determined with the command PG_GET_SERIAL_SEQUENCE. Most examples use lower case table names. In my case the tables were created by an ORM middleware (like Hibernate or Entity Framework Core etc.) and their names all started with a capital letter.

In an e-mail from 2004 (link) I got the right hint.

(Let's assume for all examples, that Foo is the table's name and Foo_id the related column.)

Command to get the sequence name:

SELECT PG_GET_SERIAL_SEQUENCE('"Foo"', 'Foo_id');

So, the table name must be in double quotes, surrounded by single quotes.

1. Validate, that the sequence is out-of-sync

SELECT CURRVAL(PG_GET_SERIAL_SEQUENCE('"Foo"', 'Foo_id')) AS "Current Value", MAX("Foo_id") AS "Max Value" FROM "Foo";

When the Current Value is less than Max Value, your sequence is out-of-sync.

2. Correction

SELECT SETVAL((SELECT PG_GET_SERIAL_SEQUENCE('"Foo"', 'Foo_id')), (SELECT (MAX("Foo_id") + 1) FROM "Foo"), FALSE);

Getting binary (base64) data from HTML5 Canvas (readAsBinaryString)

Seeing how you draw your canvas with

$("canvas").drawImage();

it seems that you use jQuery Canvas (jCanvas) by Caleb Evans. I actually use that plugin and it has a simple way to retrieve canvas base64 image string with $('canvas').getCanvasImage();

Here's a working Fiddle for you: http://jsfiddle.net/e6nqzxpn/

How to use PowerShell select-string to find more than one pattern in a file?

To search for multiple matches in each file, we can sequence several Select-String calls:

Get-ChildItem C:\Logs |
  where { $_ | Select-String -Pattern 'VendorEnquiry' } |
  where { $_ | Select-String -Pattern 'Failed' } |
  ...

At each step, files that do not contain the current pattern will be filtered out, ensuring that the final list of files contains all of the search terms.

Rather than writing out each Select-String call manually, we can simplify this with a filter to match multiple patterns:

filter MultiSelect-String( [string[]]$Patterns ) {
  # Check the current item against all patterns.
  foreach( $Pattern in $Patterns ) {
    # If one of the patterns does not match, skip the item.
    $matched = @($_ | Select-String -Pattern $Pattern)
    if( -not $matched ) {
      return
    }
  }

  # If all patterns matched, pass the item through.
  $_
}

Get-ChildItem C:\Logs | MultiSelect-String 'VendorEnquiry','Failed',...

Now, to satisfy the "Logtime about 11:30 am" part of the example would require finding the log time corresponding to each failure entry. How to do this is highly dependent on the actual structure of the files, but testing for "about" is relatively simple:

function AboutTime( [DateTime]$time, [DateTime]$target, [TimeSpan]$epsilon ) {
  $time -le ($target + $epsilon) -and $time -ge ($target - $epsilon)
}

PS> $epsilon = [TimeSpan]::FromMinutes(5)
PS> $target = [DateTime]'11:30am'
PS> AboutTime '11:00am' $target $epsilon
False
PS> AboutTime '11:28am' $target $epsilon
True
PS> AboutTime '11:35am' $target $epsilon
True

How can I echo the whole content of a .html file in PHP?

If you want to make sure the HTML file doesn't contain any PHP code and will not be executed as PHP, do not use include or require. Simply do:

echo file_get_contents("/path/to/file.html");

How to remove all the punctuation in a string? (Python)

A really simple implementation is:

out = "".join(c for c in asking if c not in ('!','.',':'))

and keep adding any other types of punctuation.

A more efficient way would be

import string
stringIn = "string.with.punctuation!"
out = stringIn.translate(stringIn.maketrans("",""), string.punctuation)

Edit: There is some more discussion on efficiency and other implementations here: Best way to strip punctuation from a string in Python

How to create multiple output paths in Webpack config

The problem is already in the language:

entry (which is a object (key/value) and is used to define the inputs*)
output (which is a object (key/value) and is used to define outputs*)

the idea to differentiate the output based on limited placeholder like '[name]' defines limitations.

I like the core functionality of webpack, but the usage requires a rewrite with abstract definitions which are based on logic and simplicity... the hardest thing in software-development... logic and simplicity.

All this could be solved by just providing a list of input/output definitions... A LIST INPUT/OUTPUT DEFINITIONS.

Although this comment doesn't help much but we can learn from our mistakes by pointing at them.

Vinod Kumar: Good workaround, its:

module.exports = {
   plugins: [
    new FileManagerPlugin({
      events: {
        onEnd: {
          copy: [
            {source: 'www', destination: './vinod test 1/'},
            {source: 'www', destination: './vinod testing 2/'},
            {source: 'www', destination: './vinod testing 3/'},
          ],
        },
      }
    }),
  ],
};

BTW. this is my first comment on stackoverflow (after 10 years as a programmer) and stackoverflow sucks in usability, like why is there so much text everywhere ? my eyes are bleeding.

socket.shutdown vs socket.close

Calling close and shutdown have two different effects on the underlying socket.

The first thing to point out is that the socket is a resource in the underlying OS and multiple processes can have a handle for the same underlying socket.

When you call close it decrements the handle count by one and if the handle count has reached zero then the socket and associated connection goes through the normal close procedure (effectively sending a FIN / EOF to the peer) and the socket is deallocated.

The thing to pay attention to here is that if the handle count does not reach zero because another process still has a handle to the socket then the connection is not closed and the socket is not deallocated.

On the other hand calling shutdown for reading and writing closes the underlying connection and sends a FIN / EOF to the peer regardless of how many processes have handles to the socket. However, it does not deallocate the socket and you still need to call close afterward.

What is the purpose of wrapping whole Javascript files in anonymous functions like “(function(){ … })()”?

In addition to keeping the variables local, one very handy use is when writing a library using a global variable, you can give it a shorter variable name to use within the library. It's often used in writing jQuery plugins, since jQuery allows you to disable the $ variable pointing to jQuery, using jQuery.noConflict(). In case it is disabled, your code can still use $ and not break if you just do:

(function($) { ...code...})(jQuery);

Is it possible to install Xcode 10.2 on High Sierra (10.13.6)?

You don't need to run Xcode 10.2 for iOS 12.2 support. You just need access to the appropriate folder in DeviceSupport.

A possible solution is

Download Xcode 10.2 from a direkt link (not from App Store).
Rename it for example to Xcode102.
Put it into /Applications. It's possible to have multiple Xcode versions in the same directory.

Create a symbolic link in Terminal.app to have access to the 12.2 device support folder in Xcode 10.2

ln -s /Applications/Xcode102.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/12.2\ \(16E226\) /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport

You can move Xcode 10.2 to somewhere else but then you have to adjust the path.

Now Xcode 10.1 supports devices running iOS 12.2

Two versions of python on linux. how to make 2.7 the default

You probably don't actually want to change your default Python.

Your distro installed a standard system Python in /usr/bin, and may have scripts that depend on this being present, and selected by #! /usr/bin/env python. You can usually get away with running Python 2.6 scripts in 2.7, but do you want to risk it?

On top of that, monkeying with /usr/bin can break your package manager's ability to manage packages. And changing the order of directories in your PATH will affect a lot of other things besides Python. (In fact, it's more common to have /usr/local/bin ahead of /usr/bin, and it may be what you actually want—but if you have it the other way around, presumably there's a good reason for that.)

But you don't need to change your default Python to get the system to run 2.7 when you type python.

First, you can set up a shell alias:

alias python=/usr/local/bin/python2.7

Type that at a prompt, or put it in your ~/.bashrc if you want the change to be persistent, and now when you type python it runs your chosen 2.7, but when some program on your system tries to run a script with /usr/bin/env python it runs the standard 2.6.

Alternatively, just create a virtual environment out of your 2.7 (or separate venvs for different projects), and do your work inside the venv.

MySQL Query - Records between Today and Last 30 Days

For the current date activity and complete activity for previous 30 days use this, since the SYSDATE is variable in a day the previous 30th day will not have the whole data for that day.

SELECT  DATE_FORMAT(create_date, '%m/%d/%Y')
FROM mytable
WHERE create_date BETWEEN CURDATE() - INTERVAL 30 DAY AND SYSDATE()

How to multiply all integers inside list

The most pythonic way would be to use a list comprehension:

l = [2*x for x in l]

If you need to do this for a large number of integers, use numpy arrays:

l = numpy.array(l, dtype=int)*2

A final alternative is to use map

l = list(map(lambda x:2*x, l))

Close Window from ViewModel

Well here is something I used in several projects. It may look like a hack, but it works fine.

public class AttachedProperties : DependencyObject //adds a bindable DialogResult to window
{
    public static readonly DependencyProperty DialogResultProperty = 
        DependencyProperty.RegisterAttached("DialogResult", typeof(bool?), typeof(AttachedProperties), 
        new PropertyMetaData(default(bool?), OnDialogResultChanged));

    public bool? DialogResult
    {
        get { return (bool?)GetValue(DialogResultProperty); }
        set { SetValue(DialogResultProperty, value); }
    }

    private static void OnDialogResultChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var window = d as Window;
        if (window == null)
            return;

        window.DialogResult = (bool?)e.NewValue;
    }
}

Now you can bind DialogResult to a VM and set its value of a property. The Window will close, when the value is set.

<!-- Assuming that the VM is bound to the DataContext and the bound VM has a property DialogResult -->
<Window someNs:AttachedProperties.DialogResult={Binding DialogResult} />

This is an abstract of what's running in our production environment

<Window x:Class="AC.Frontend.Controls.DialogControl.Dialog"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:DialogControl="clr-namespace:AC.Frontend.Controls.DialogControl" 
        xmlns:hlp="clr-namespace:AC.Frontend.Helper"
        MinHeight="150" MinWidth="300" ResizeMode="NoResize" SizeToContent="WidthAndHeight"
        WindowStartupLocation="CenterScreen" Title="{Binding Title}"
        hlp:AttachedProperties.DialogResult="{Binding DialogResult}" WindowStyle="ToolWindow" ShowInTaskbar="True"
        Language="{Binding UiCulture, Source={StaticResource Strings}}">
        <!-- A lot more stuff here -->
</Window>

As you can see, I'm declaring the namespace xmlns:hlp="clr-namespace:AC.Frontend.Helper" first and afterwards the binding hlp:AttachedProperties.DialogResult="{Binding DialogResult}".

The AttachedProperty looks like this. It's not the same I posted yesterday, but IMHO it shouldn't have any effect.

public class AttachedProperties
{
    #region DialogResult

    public static readonly DependencyProperty DialogResultProperty =
        DependencyProperty.RegisterAttached("DialogResult", typeof (bool?), typeof (AttachedProperties), new PropertyMetadata(default(bool?), OnDialogResultChanged));

    private static void OnDialogResultChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var wnd = d as Window;
        if (wnd == null)
            return;

        wnd.DialogResult = (bool?) e.NewValue;
    }

    public static bool? GetDialogResult(DependencyObject dp)
    {
        if (dp == null) throw new ArgumentNullException("dp");

        return (bool?)dp.GetValue(DialogResultProperty);
    }

    public static void SetDialogResult(DependencyObject dp, object value)
    {
        if (dp == null) throw new ArgumentNullException("dp");

        dp.SetValue(DialogResultProperty, value);
    }

    #endregion
}

selenium - chromedriver executable needs to be in PATH

An answer from 2020. The following code solves this. A lot of people new to selenium seem to have to get past this step. Install the chromedriver and put it inside a folder on your desktop. Also make sure to put the selenium python project in the same folder as where the chrome driver is located.

Change USER_NAME and FOLDER in accordance to your computer.

For Windows

driver = webdriver.Chrome(r"C:\Users\USER_NAME\Desktop\FOLDER\chromedriver")

For Linux/Mac

driver = webdriver.Chrome("/home/USER_NAME/FOLDER/chromedriver")

sed: print only matching group

I agree with @kent that this is well suited for grep -o. If you need to extract a group within a pattern, you can do it with a 2nd grep.

# To extract \1 from /xx([0-9]+)yy/
$ echo "aa678bb xx123yy xx4yy aa42 aa9bb" | grep -Eo 'xx[0-9]+yy' | grep -Eo '[0-9]+'
123
4

# To extract \1 from /a([0-9]+)b/
$ echo "aa678bb xx123yy xx4yy aa42 aa9bb" | grep -Eo 'a[0-9]+b' | grep -Eo '[0-9]+'
678
9

I generally cringe when I see 2 calls to grep/sed/awk piped together, but it's not always wrong. While we should exercise our skills of doing things efficiently, "A foolish consistency is the hobgoblin of little minds", and "Real artists ship".

git: can't push (unpacker error) related to permission issues

I was having trouble with this too, thinking my remote gitolite-admin was corrupted or something wrong.

My setup is Mac OS X (10.6.6) laptop with remote Ubuntu 10 server with gitolite.

It turned out that the problem was with my local checkout of gitolite-admin.

Despite the "unpack failed" error, it turned out the the problem was local.

I figured this out by checking it out again as gitolite-admin2, making a change, and the pushing.

Voila! It worked!

how to open an URL in Swift3

All you need is:

guard let url = URL(string: "http://www.google.com") else {
  return //be safe
}

if #available(iOS 10.0, *) {
    UIApplication.shared.open(url, options: [:], completionHandler: nil)
} else {
    UIApplication.shared.openURL(url)
}

Spring Data JPA map the native query result to Non-Entity POJO

I think Michal's approach is better. But, there is one more way to get the result out of the native query.

@Query(value = "SELECT g.*, gm.* FROM group g LEFT JOIN group_members gm ON g.group_id = gm.group_id and gm.user_id = :userId WHERE g.group_id = :groupId", nativeQuery = true)
String[][] getGroupDetails(@Param("userId") Integer userId, @Param("groupId") Integer groupId);

Now, you can convert this 2D string array into your desired entity.

ASP.net page without a code behind

I thought you could deploy just your .aspx page without the .aspx.cs so long as the DLL was in your bin. Part of the issue here is how visual studio .net works with .aspx pages.

Check it out here: Working with Single-File Web Forms Pages in Visual Studio .NET

I know for sure that VS2008 with asp.net MVC RC you don't have code-behind files for your views.

Checking for Undefined In React

I was face same problem ..... And I got solution by using typeof()

if (typeof(value) !== 'undefined' && value != null) {
         console.log('Not Undefined and Not Null')
  } else {
         console.log('Undefined or Null')
}

You must have to use typeof() to identified undefined

Using multiprocessing.Process with a maximum number of simultaneous processes

more generally, this could also look like this:

import multiprocessing
def chunks(l, n):
    for i in range(0, len(l), n):
        yield l[i:i + n]

numberOfThreads = 4


if __name__ == '__main__':
    jobs = []
    for i, param in enumerate(params):
        p = multiprocessing.Process(target=f, args=(i,param))
        jobs.append(p)
    for i in chunks(jobs,numberOfThreads):
        for j in i:
            j.start()
        for j in i:
            j.join()

Of course, that way is quite cruel (since it waits for every process in a junk until it continues with the next chunk). Still it works well for approx equal run times of the function calls.

Capture keyboardinterrupt in Python without try-except

Yes, you can install an interrupt handler using the module signal, and wait forever using a threading.Event:

import signal
import sys
import time
import threading

def signal_handler(signal, frame):
    print('You pressed Ctrl+C!')
    sys.exit(0)

signal.signal(signal.SIGINT, signal_handler)
print('Press Ctrl+C')
forever = threading.Event()
forever.wait()

CSS transition between left -> right and top -> bottom positions

You can animate the position (top, bottom, left, right) and then subtract the element's width or height through a CSS transformation.

Consider:

_x000D_

$('.animate').on('click', function(){
  $(this).toggleClass("move");
})

_x000D_

     .animate {
        height: 100px;
        width: 100px;
        background-color: #c00;
        transition: all 1s ease;
        position: absolute;
        cursor: pointer;
        font: 13px/100px sans-serif;
        color: white;
        text-align: center;
      }

                               /* ? just to position things  */
      .animate.left   { left: 0;   top: 50%;  margin-top: -100px;}
      .animate.right  { right: 0;  top: 50%;  }
      .animate.top    { top: 0;    left: 50%; }
      .animate.bottom { bottom: 0; left: 50%; margin-left: -100px;}


      .animate.left.move {
        left: 100%; 
        transform: translate(-100%, 0);
      }

      .animate.right.move {
        right: 100%; 
        transform: translate(100%, 0);
      }

      .animate.top.move {
        top: 100%; 
        transform: translate(0, -100%);
      }

      .animate.bottom.move {
        bottom: 100%; 
        transform: translate(0, 100%);
      }

_x000D_

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
Click to animate
<div class="animate left">left</div>
<div class="animate top">top</div>
<div class="animate bottom">bottom</div>
<div class="animate right">right</div>

_x000D_

And then animate depending on the position...

Should import statements always be at the top of a module?

Curt makes a good point: the second version is clearer and will fail at load time rather than later, and unexpectedly.

Normally I don't worry about the efficiency of loading modules, since it's (a) pretty fast, and (b) mostly only happens at startup.

If you have to load heavyweight modules at unexpected times, it probably makes more sense to load them dynamically with the __import__ function, and be sure to catch ImportError exceptions, and handle them in a reasonable manner.

Flask at first run: Do not use the development server in a production environment

Unless you tell the development server that it's running in development mode, it will assume you're using it in production and warn you not to. The development server is not intended for use in production. It is not designed to be particularly efficient, stable, or secure.

Enable development mode by setting the FLASK_ENV environment variable to development.

$ export FLASK_APP=example
$ export FLASK_ENV=development
$ flask run

If you're running in PyCharm (or probably any other IDE) you can set environment variables in the run configuration.

Development mode enables the debugger and reloader by default. If you don't want these, pass --no-debugger or --no-reloader to the run command.

That warning is just a warning though, it's not an error preventing your app from running. If your app isn't working, there's something else wrong with your code.

How to select rows with NaN in particular column?

@qbzenker provided the most idiomatic method IMO

Here are a few alternatives:

In [28]: df.query('Col2 != Col2') # Using the fact that: np.nan != np.nan
Out[28]:
   Col1  Col2  Col3
1     0   NaN   0.0

In [29]: df[np.isnan(df.Col2)]
Out[29]:
   Col1  Col2  Col3
1     0   NaN   0.0

Truncate all tables in a MySQL database in one command?

SET FOREIGN_KEY_CHECKS = 0;

SELECT @str := CONCAT('TRUNCATE TABLE ', table_schema, '.', table_name, ';')
FROM   information_schema.tables
WHERE  table_type   = 'BASE TABLE'
  AND  table_schema IN ('db1_name','db2_name');

PREPARE stmt FROM @str;

EXECUTE stmt;

DEALLOCATE PREPARE stmt;

SET FOREIGN_KEY_CHECKS = 1;

How to open a link in new tab using angular?

In the app-routing.modules.ts file:

{
    path: 'hero/:id', component: HeroComponent
}

In the component.html file:

target="_blank" [routerLink]="['/hero', '/sachin']"

UIViewController viewDidLoad vs. viewWillAppear: What is the proper division of labor?

Initially used only ViewDidLoad with tableView. On testing with loss of Wifi, by setting device to airplane mode, realized that the table did not refresh with return of Wifi. In fact, there appears to be no way to refresh tableView on the device even by hitting the home button with background mode set to YES in -Info.plist.

My solution:

-(void) viewWillAppear: (BOOL) animated { [self.tableView reloadData];}

How do you make div elements display inline?

<style type="text/css">
div.inline { display:inline; }
</style>
<div class="inline">a</div>
<div class="inline">b</div>
<div class="inline">c</div>

Cordova - Error code 1 for command | Command failed for

I'm using Visual Studio 2015, and I've found that the first thing to do is look in the build output.

I found this error reported there:

Reading build config file: \build.json... SyntaxError: Unexpected token

The solution for that was to remove the bom from the build.json file

Then I hit a second problem - with this message in the build output:

FAILURE: Build failed with an exception. * What went wrong: A problem was found with the configuration of task ':packageRelease'.

File 'C:\Users\Colin\etc' specified for property 'signingConfig.storeFile' is not a file.

Easily solved by putting the correct filename into the keystore property

Getting the User Agent with JavaScript

How can I make a horizontal ListView in Android?

Have you looked into the ViewFlipper component? Maybe it can help you.

http://developer.android.com/reference/android/widget/ViewFlipper.html

With this component, you can attach two or more view childs. If you add some translate animation and capture Gesture detection, you can have a nicely horizontal scroll.

How do I compare a value to a backslash?

If message.value[] is string:

if message.value[0] in ('/', '\'):
    do_stuff()

If it not str

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

The reject actually takes one parameter: that's the exception that occurred in your code that caused the promise to be rejected. So, when you call reject() the exception value is undefined, hence the "undefined" part in the error that you get.

You do not show the code that uses the promise, but I reckon it is something like this:

var promise = doSth();
promise.then(function() { doSthHere(); });

Try adding an empty failure call, like this:

promise.then(function() { doSthHere(); }, function() {});

This will prevent the error to appear.

However, I would consider calling reject only in case of an actual error, and also... having empty exception handlers isn't the best programming practice.

Replace Multiple String Elements in C#

this will be more efficient:

public static class StringExtension
{
    public static string clean(this string s)
    {
        return new StringBuilder(s)
              .Replace("&", "and")
              .Replace(",", "")
              .Replace("  ", " ")
              .Replace(" ", "-")
              .Replace("'", "")
              .Replace(".", "")
              .Replace("eacute;", "é")
              .ToString()
              .ToLower();
    }
}

Is there a good Valgrind substitute for Windows?

Does Jochen Kalmbach's Memory Leak Detector qualify?

PS: The URL to the latest version is buried somewhere in the article's comment thread.

How can I convert a stack trace to a string?

Few options

StringWriter sw = new StringWriter(); e.printStackTrace(new PrintWriter(sw)); String exceptionAsString = sw.toString();
Using Google Guava lib String stackTrace = Throwables.getStackTraceAsString ( myException ) ;
org.apache.commons.lang.exception.ExceptionUtils.getStackTrace(Throwable)

How to do encryption using AES in Openssl

Check out this link it has a example code to encrypt/decrypt data using AES256CBC using EVP API.

https://github.com/saju/misc/blob/master/misc/openssl_aes.c

Also you can check the use of AES256 CBC in a detailed open source project developed by me at https://github.com/llubu/mpro

The code is detailed enough with comments and if you still need much explanation about the API itself i suggest check out this book Network Security with OpenSSL by Viega/Messier/Chandra (google it you will easily find a pdf of this..) read chapter 6 which is specific to symmetric ciphers using EVP API.. This helped me a lot actually understanding the reasons behind using various functions and structures of EVP.

and if you want to dive deep into the Openssl crypto library, i suggest download the code from the openssl website (the version installed on your machine) and then look in the implementation of EVP and aeh api implementation.

One more suggestion from the code you posted above i see you are using the api from aes.h instead use EVP. Check out the reason for doing this here OpenSSL using EVP vs. algorithm API for symmetric crypto nicely explained by Daniel in one of the question asked by me..

Deleting a pointer in C++

I believe you're not fully understanding how pointers work.
When you have a pointer pointing to some memory there are three different things you must understand:
- there is "what is pointed" by the pointer (the memory)
- this memory address
- not all pointers need to have their memory deleted: you only need to delete memory that was dynamically allocated (used new operator).

Imagine:

int *ptr = new int; 
// ptr has the address of the memory.
// at this point, the actual memory doesn't have anything.
*ptr = 8;
// you're assigning the integer 8 into that memory.
delete ptr;
// you are only deleting the memory.
// at this point the pointer still has the same memory address (as you could
//   notice from your 2nd test) but what inside that memory is gone!

When you did

ptr = NULL;
// you didn't delete the memory
// you're only saying that this pointer is now pointing to "nowhere".
// the memory that was pointed by this pointer is now lost.

C++ allows that you try to delete a pointer that points to null but it doesn't actually do anything, just doesn't give any error.

Creating/writing into a new file in Qt

Your code is perfectly fine, you are just not looking at the right location to find your file. Since you haven't provided absolute path, your file will be created relative to the current working folder (more precisely in the current working folder in your case).

Your current working folder is set by Qt Creator. Go to Projects >> Your selected build >> Press the 'Run' button (next to 'Build) and you will see what it is on this page which of course you can change as well.

new DateTime() vs default(DateTime)

If you want to use default value for a DateTime parameter in a method, you can only use default(DateTime).

The following line will not compile:

    private void MyMethod(DateTime syncedTime = DateTime.MinValue)

This line will compile:

    private void MyMethod(DateTime syncedTime = default(DateTime))

Git undo changes in some files

Why can't you simply mark what changes you want to have in a commit using "git add <file>" (or even "git add --interactive", or "git gui" which has option for interactive comitting), and then use "git commit" instead of "git commit -a"?

In your situation (for your example) it would be:

prompt> git add B
prompt> git commit

Only changes to file B would be comitted, and file A would be left "dirty", i.e. with those print statements in the working area version. When you want to remove those print statements, it would be enought to use

prompt> git reset A

prompt> git checkout HEAD -- A

to revert to comitted version (version from HEAD, i.e. "git show HEAD:A" version).

Open file dialog and select a file using WPF controls and C#

Something like that should be what you need

private void button1_Click(object sender, RoutedEventArgs e)
{
    // Create OpenFileDialog 
    Microsoft.Win32.OpenFileDialog dlg = new Microsoft.Win32.OpenFileDialog();



    // Set filter for file extension and default file extension 
    dlg.DefaultExt = ".png";
    dlg.Filter = "JPEG Files (*.jpeg)|*.jpeg|PNG Files (*.png)|*.png|JPG Files (*.jpg)|*.jpg|GIF Files (*.gif)|*.gif"; 


    // Display OpenFileDialog by calling ShowDialog method 
    Nullable<bool> result = dlg.ShowDialog();


    // Get the selected file name and display in a TextBox 
    if (result == true)
    {
        // Open document 
        string filename = dlg.FileName;
        textBox1.Text = filename;
    }
}

Oracle comparing timestamp with date

You can truncate the date part:

select * from table1 where trunc(field1) = to_date('2012-01-01', 'YYYY-MM-DD')

The trouble with this approach is that any index on field1 wouldn't be used due to the function call.

Alternatively (and more index friendly)

select * from table1 
 where field1 >= to_timestamp('2012-01-01', 'YYYY-MM-DD') 
   and field1 < to_timestamp('2012-01-02', 'YYYY-MM-DD')

How to convert a string to ASCII

Try Linq:

Result = string.Join("", input.ToCharArray().Where(x=> ((int)x) < 127));

This will filter out all non ascii characters. Now if you want an equivalent, try the following:

Result = string.Join("", System.Text.Encoding.ASCII.GetChars(System.Text.Encoding.ASCII.GetBytes(input.ToCharArray())));

How do I request and process JSON with python?

Python's standard library has json and urllib2 modules.

import json
import urllib2

data = json.load(urllib2.urlopen('http://someurl/path/to/json'))

Checking if a list is empty with LINQ

This extension method works for me:

public static bool IsEmpty<T>(this IEnumerable<T> enumerable)
{
    try
    {
        enumerable.First();
        return false;
    }
    catch (InvalidOperationException)
    {
        return true;
    }
}

How to create an infinite loop in Windows batch file?

read help GOTO

and try

:again
do it
goto again

php - insert a variable in an echo string

Always use double quotes when using a variable inside a string and backslash any other double quotes except the starting and ending ones. You could also use the brackets like below so it's easier to find your variables inside the strings and make them look cleaner.

$var = 'my variable';
echo "I love ${var}";

$var = 'my variable';
echo "I love {$var}";

Above would return the following: I love my variable

How can I access a hover state in reactjs?

React components expose all the standard Javascript mouse events in their top-level interface. Of course, you can still use :hover in your CSS, and that may be adequate for some of your needs, but for the more advanced behaviors triggered by a hover you'll need to use the Javascript. So to manage hover interactions, you'll want to use onMouseEnter and onMouseLeave. You then attach them to handlers in your component like so:

<ReactComponent
    onMouseEnter={() => this.someHandler}
    onMouseLeave={() => this.someOtherHandler}
/>

You'll then use some combination of state/props to pass changed state or properties down to your child React components.

How do I tell CMake to link in a static library in the source directory?

I found this helpful...

http://www.cmake.org/pipermail/cmake/2011-June/045222.html

From their example:

ADD_LIBRARY(boost_unit_test_framework STATIC IMPORTED)
SET_TARGET_PROPERTIES(boost_unit_test_framework PROPERTIES IMPORTED_LOCATION /usr/lib/libboost_unit_test_framework.a)
TARGET_LINK_LIBRARIES(mytarget A boost_unit_test_framework C)

Converting string into datetime

arrow offers many useful functions for dates and times. This bit of code provides an answer to the question and shows that arrow is also capable of formatting dates easily and displaying information for other locales.

>>> import arrow
>>> dateStrings = [ 'Jun 1  2005 1:33PM', 'Aug 28 1999 12:00AM' ]
>>> for dateString in dateStrings:
...     dateString
...     arrow.get(dateString.replace('  ',' '), 'MMM D YYYY H:mmA').datetime
...     arrow.get(dateString.replace('  ',' '), 'MMM D YYYY H:mmA').format('ddd, Do MMM YYYY HH:mm')
...     arrow.get(dateString.replace('  ',' '), 'MMM D YYYY H:mmA').humanize(locale='de')
...
'Jun 1  2005 1:33PM'
datetime.datetime(2005, 6, 1, 13, 33, tzinfo=tzutc())
'Wed, 1st Jun 2005 13:33'
'vor 11 Jahren'
'Aug 28 1999 12:00AM'
datetime.datetime(1999, 8, 28, 0, 0, tzinfo=tzutc())
'Sat, 28th Aug 1999 00:00'
'vor 17 Jahren'

See http://arrow.readthedocs.io/en/latest/ for more.

Multiple submit buttons in the same form calling different Servlets

You may need to write a javascript for each button submit. Instead of defining action in form definition, set those values in javascript. Something like below.

function callButton1(form, yourServ)
{
form.action = yourServ;
form.submit();
});

What are the applications of binary trees?

One of the most common application is to efficiently store data in sorted form in order to access and search stored elements quickly. For instance, std::map or std::set in C++ Standard Library.

Binary tree as data structure is useful for various implementations of expression parsers and expression solvers.

It may also be used to solve some of database problems, for example, indexing.

Generally, binary tree is a general concept of particular tree-based data structure and various specific types of binary trees can be constructed with different properties.

MySQL DISTINCT on a GROUP_CONCAT()

SELECT
  GROUP_CONCAT(DISTINCT (category))
FROM (
  SELECT
    SUBSTRING_INDEX(SUBSTRING_INDEX(tableName.categories, ' ', numbers.n), ' ', -1) category
  FROM
    numbers INNER JOIN tableName
    ON LENGTH(tableName.categories)>=LENGTH(REPLACE(tableName.categories, ' ', ''))+numbers.n-1
  ) s;

This will return distinct values like: test1,test2,test4,test3

Map<String, String>, how to print both the "key string" and "value string" together

final Map<String, String> mss1 = new ProcessBuilder().environment();
mss1.entrySet()
        .stream()
        //depending on how you want to join K and V use different delimiter
        .map(entry -> 
        String.join(":", entry.getKey(),entry.getValue()))
        .forEach(System.out::println);

Set width of a "Position: fixed" div relative to parent div

There is an easy solution for this.

I have used a fixed position for parent div and a max-width for the contents.

You don't need to think about too much about other containers because fixed position only relative to the browser window.

_x000D_

       .fixed{_x000D_
            width:100%;_x000D_
            position:fixed;_x000D_
            height:100px;_x000D_
            background: red;_x000D_
        }_x000D_
_x000D_
        .fixed .content{_x000D_
            max-width: 500px;_x000D_
            background:blue;_x000D_
            margin: 0 auto;_x000D_
            text-align: center;_x000D_
            padding: 20px 0;_x000D_
        }

_x000D_

<div class="fixed">_x000D_
  <div class="content">_x000D_
     This is my content_x000D_
  </div>_x000D_
</div>

_x000D_

How to install Openpyxl with pip

I had to do: c:\Users\xxxx>c:/python27/scripts/pip install openpyxl I had to save the openpyxl files in the scripts folder.

How do files get into the External Dependencies in Visual Studio C++?

The External Dependencies folder is populated by IntelliSense: the contents of the folder do not affect the build at all (you can in fact disable the folder in the UI).

You need to actually include the header (using a #include directive) to use it. Depending on what that header is, you may also need to add its containing folder to the "Additional Include Directories" property and you may need to add additional libraries and library folders to the linker options; you can set all of these in the project properties (right click the project, select Properties). You should compare the properties with those of the project that does build to determine what you need to add.

How to combine 2 plots (ggplot) into one plot?

Just combine them. I think this should work but it's untested:

p <- ggplot(visual1, aes(ISSUE_DATE,COUNTED)) + geom_point() + 
     geom_smooth(fill="blue", colour="darkblue", size=1)

p <- p + geom_point(data=visual2, aes(ISSUE_DATE,COUNTED)) + 
     geom_smooth(data=visual2, fill="red", colour="red", size=1)

print(p)

SQL How to replace values of select return?

You can use casting in the select clause like:

SELECT id, name, CAST(hide AS BOOLEAN) FROM table_name;

jQuery $(".class").click(); - multiple elements, click event once

I just had the same problem. In my case PHP code generated few times the same jQuery code and that was the multiple trigger.

<a href="#popraw" class="report" rel="884(PHP MULTIPLE GENERATER NUMBERS)">Popraw / Zglos</a>

(PHP MULTIPLE GENERATER NUMBERS generated also the same code multiple times)

<script type="text/javascript">
$('.report').click(function(){...});
</script>

My solution was to separate script in another php file and load that file ONE TIME.

Difference between thread's context class loader and normal classloader

Each class will use its own classloader to load other classes. So if ClassA.class references ClassB.class then ClassB needs to be on the classpath of the classloader of ClassA, or its parents.

The thread context classloader is the current classloader for the current thread. An object can be created from a class in ClassLoaderC and then passed to a thread owned by ClassLoaderD. In this case the object needs to use Thread.currentThread().getContextClassLoader() directly if it wants to load resources that are not available on its own classloader.

Error: Cannot invoke an expression whose type lacks a call signature

Add a type to your variable and then return.

Eg:

const myVariable : string [] = ['hello', 'there'];

const result = myVaraible.map(x=> {
  return
  {
    x.id
  }
});

=> Important part is adding the string[] type etc:

ls command: how can I get a recursive full-path listing, one line per file?

du -a

Handy for some limited appliance shells where find/locate aren't available.

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

Update: On v8.0.15 (maybe this version) the PASSWORD() function does not work.

You have to:

Make sure you have Stopped MySQL first.
Run the server in safe mode with privilege bypass: sudo mysqld_safe --skip-grant-tables
Login: mysql -u root
mysql> UPDATE mysql.user SET authentication_string=null WHERE User='root';
mysql> FLUSH PRIVILEGES;
mysql> exit;
Login again: mysql -u root
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH caching_sha2_password BY 'yourpasswd';

Force update of an Android app when a new version is available

try this: First you need to make a request call to the playstore link, fetch current version from there and then compare it with your current version.

String currentVersion, latestVersion;
Dialog dialog;
private void getCurrentVersion(){
 PackageManager pm = this.getPackageManager();
        PackageInfo pInfo = null;

        try {
            pInfo =  pm.getPackageInfo(this.getPackageName(),0);

        } catch (PackageManager.NameNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        currentVersion = pInfo.versionName;

   new GetLatestVersion().execute();

}

private class GetLatestVersion extends AsyncTask<String, String, JSONObject> {

        private ProgressDialog progressDialog;

        @Override
        protected void onPreExecute() {
            super.onPreExecute();
        }

        @Override
        protected JSONObject doInBackground(String... params) {
            try {
//It retrieves the latest version by scraping the content of current version from play store at runtime
                Document doc = Jsoup.connect(urlOfAppFromPlayStore).get();
                latestVersion = doc.getElementsByClass("htlgb").get(6).text();

            }catch (Exception e){
                e.printStackTrace();

            }

            return new JSONObject();
        }

        @Override
        protected void onPostExecute(JSONObject jsonObject) {
            if(latestVersion!=null) {
                if (!currentVersion.equalsIgnoreCase(latestVersion)){
                   if(!isFinishing()){ //This would help to prevent Error : BinderProxy@45d459c0 is not valid; is your activity running? error
                    showUpdateDialog();
                    }
                }
            }
            else
                background.start();
            super.onPostExecute(jsonObject);
        }
    }

private void showUpdateDialog(){
        final AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("A New Update is Available");
        builder.setPositiveButton("Update", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse
                        ("market://details?id=yourAppPackageName")));
                dialog.dismiss();
            }
        });

        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                background.start();
            }
        });

        builder.setCancelable(false);
        dialog = builder.show();
    }

Check if XML Element exists

You can validate that and much more by using an XML schema language, like XSD.

If you mean conditionally, within code, then XPath is worth a look as well.

Detect whether a Python string is a number or a letter

Check if string is positive digit (integer) and alphabet

You may use str.isdigit() and str.isalpha() to check whether given string is positive integer and alphabet respectively.

Sample Results:

# For alphabet
>>> 'A'.isdigit()
False
>>> 'A'.isalpha()
True

# For digit
>>> '1'.isdigit()
True
>>> '1'.isalpha()
False

Check for strings as positive/negative - integer/float

str.isdigit() returns False if the string is a negative number or a float number. For example:

# returns `False` for float
>>> '123.3'.isdigit()
False
# returns `False` for negative number
>>> '-123'.isdigit()
False

If you want to also check for the negative integers and float, then you may write a custom function to check for it as:

def is_number(n):
    try:
        float(n)   # Type-casting the string to `float`.
                   # If string is not a valid `float`, 
                   # it'll raise `ValueError` exception
    except ValueError:
        return False
    return True

Sample Run:

>>> is_number('123')    # positive integer number
True

>>> is_number('123.4')  # positive float number
True
 
>>> is_number('-123')   # negative integer number
True

>>> is_number('-123.4') # negative `float` number
True

>>> is_number('abc')    # `False` for "some random" string
False

Discard "NaN" (not a number) strings while checking for number

The above functions will return True for the "NAN" (Not a number) string because for Python it is valid float representing it is not a number. For example:

>>> is_number('NaN')
True

In order to check whether the number is "NaN", you may use math.isnan() as:

>>> import math
>>> nan_num = float('nan')

>>> math.isnan(nan_num)
True

Or if you don't want to import additional library to check this, then you may simply check it via comparing it with itself using ==. Python returns False when nan float is compared with itself. For example:

# `nan_num` variable is taken from above example
>>> nan_num == nan_num
False

Hence, above function is_number can be updated to return False for "NaN" as:

def is_number(n):
    is_number = True
    try:
        num = float(n)
        # check for "nan" floats
        is_number = num == num   # or use `math.isnan(num)`
    except ValueError:
        is_number = False
    return is_number

Sample Run:

>>> is_number('Nan')   # not a number "Nan" string
False

>>> is_number('nan')   # not a number string "nan" with all lower cased
False

>>> is_number('123')   # positive integer
True

>>> is_number('-123')  # negative integer
True

>>> is_number('-1.12') # negative `float`
True

>>> is_number('abc')   # "some random" string
False

Allow Complex Number like "1+2j" to be treated as valid number

The above function will still return you False for the complex numbers. If you want your is_number function to treat complex numbers as valid number, then you need to type cast your passed string to complex() instead of float(). Then your is_number function will look like:

def is_number(n):
    is_number = True
    try:
        #      v type-casting the number here as `complex`, instead of `float`
        num = complex(n)
        is_number = num == num
    except ValueError:
        is_number = False
    return is_number

Sample Run:

>>> is_number('1+2j')    # Valid 
True                     #      : complex number 

>>> is_number('1+ 2j')   # Invalid 
False                    #      : string with space in complex number represetantion
                         #        is treated as invalid complex number

>>> is_number('123')     # Valid
True                     #      : positive integer

>>> is_number('-123')    # Valid 
True                     #      : negative integer

>>> is_number('abc')     # Invalid 
False                    #      : some random string, not a valid number

>>> is_number('nan')     # Invalid
False                    #      : not a number "nan" string

PS: Each operation for each check depending on the type of number comes with additional overhead. Choose the version of is_number function which fits your requirement.

How to bind event listener for rendered elements in Angular 2?

In order to add an EventListener to an element in angular 2+, we can use the method listen of the Renderer2 service (Renderer is deprecated, so use Renderer2):

listen(target: 'window'|'document'|'body'|any, eventName: string, callback: (event: any) => boolean | void): () => void

Example:

export class ListenDemo implements AfterViewInit { 
   @ViewChild('testElement') 
   private testElement: ElementRef;
   globalInstance: any;       

   constructor(private renderer: Renderer2) {
   }

   ngAfterViewInit() {
       this.globalInstance = this.renderer.listen(this.testElement.nativeElement, 'click', () => {
           this.renderer.setStyle(this.testElement.nativeElement, 'color', 'green');
       });
    }
}

Note:

When you use this method to add an event listener to an element in the dom, you should remove this event listener when the component is destroyed

You can do that this way:

ngOnDestroy() {
  this.globalInstance();
}

The way of use of ElementRef in this method should not expose your angular application to a security risk. for more on this referrer to ElementRef security risk angular 2

How to break out from foreach loop in javascript

Use a for loop instead of .forEach()

var myObj = [{"a": "1","b": null},{"a": "2","b": 5}]
var result = false

for(var call of myObj) {
    console.log(call)
    
    var a = call['a'], b = call['b']
     
    if(a == null || b == null) {
        result = false
        break
    }
}

Maven Run Project

Give the Exec Maven plugin a try

Can't update: no tracked branch

If I'm not mislead, you just need to set your local branches to track their pairs in the origin server.

Using your command line, you can try

git checkout mybranch
git branch --set-upstream-to=origin/mybranch

That will configure something as an equivalent of your local branch in the server. I'll bet that Android Studio is complaining about the lack of that.

If someone knows how to do this using the GUI of that IDE, that would be interesting to read. :)

Python: can't assign to literal

This is taken from the Python docs:

Identifiers (also referred to as names) are described by the following lexical definitions:

identifier ::=  (letter|"_") (letter | digit | "_")*

letter     ::=  lowercase | uppercase

lowercase  ::=  "a"..."z"

uppercase  ::=  "A"..."Z"

digit      ::=  "0"..."9"

Identifiers are unlimited in length. Case is significant.

That should explain how to name your variables.

How to set the maximum memory usage for JVM?

The NativeHeap can be increasded by -XX:MaxDirectMemorySize=256M (default is 128)

I've never used it. Maybe you'll find it useful.

How to write/update data into cells of existing XLSX workbook using xlsxwriter in python

Note that openpyxl does not have a large toolbox for manipulating and editing images. Xlsxwriter has methods for images, but on the other hand cannot import existing worksheets...

I have found that this works for rows... I'm sure there's a way to do it for columns...

import openpyxl

oxl = openpyxl.load_workbook('File Loction Here')
xl = oxl.['SheetName']

x=0
col = "A"
row = x

while (row <= 100):
    y = str(row)
    cell = col + row
    xl[cell] = x
    row = row + 1
    x = x + 1

How do I create a timeline chart which shows multiple events? Eg. Metallica Band members timeline on wiki

A Stacked bar chart should suffice:

Setup data as follows

Name    Start       End         Duration (End - Start)
Fred    1/01/1981   1/06/1985    1612   
Bill    1/07/1985   1/11/2000    5602  
Joe     1/01/1980   1/12/2001    8005  
Jim     1/03/1999   1/01/2000    306

Plot Start and Duration as a stacked bar chart
Set the X-Axis minimum to the desired start date
Set the Fill Colour of thestart range to no fill
Set the Fill of individual bars to suit

(example prepared in Excel 2010)

enter image description here

Generate HTML table from 2D JavaScript array

An es6 version of Daniel Williams' answer:

  function get_table(data) {
    let result = ['<table border=1>'];
    for(let row of data) {
        result.push('<tr>');
        for(let cell of row){
            result.push(`<td>${cell}</td>`);
        }
        result.push('</tr>');
    }
    result.push('</table>');
    return result.join('\n');
  }

Change the color of a checked menu item in a navigation drawer

One need to set NavigateItem checked true whenever item in NavigateView is clicked

//listen for navigation events
NavigationView navigationView = (NavigationView)findViewById(R.id.navigation);
navigationView.setNavigationItemSelectedListener(this);
// select the correct nav menu item
navigationView.getMenu().findItem(mNavItemId).setChecked(true);

Add NavigationItemSelectedListener on NavigationView

  @Override
  public boolean onNavigationItemSelected(final MenuItem menuItem) {
    // update highlighted item in the navigation menu
    menuItem.setChecked(true);
    mNavItemId = menuItem.getItemId();

    // allow some time after closing the drawer before performing real navigation
    // so the user can see what is happening
    mDrawerLayout.closeDrawer(GravityCompat.START);
    mDrawerActionHandler.postDelayed(new Runnable() {
      @Override
      public void run() {
        navigate(menuItem.getItemId());
      }
    }, DRAWER_CLOSE_DELAY_MS);
    return true;
  }

Change window location Jquery

I'm assuming you're using jquery to make the AJAX call so you can do this pretty easily by putting the redirect in the success like so:

    $.ajax({
       url: 'ajax_location.html',
       success: function(data) {
          //this is the redirect
          document.location.href='/newpage/';
       }
    });

Using Jquery Ajax to retrieve data from Mysql

This answer was for @
Neha Gandhi but I modified it for  people who use pdo and mysqli sing mysql functions are not supported. Here is the new answer 

    <html>
<!--Save this as index.php-->
      <script src="//code.jquery.com/jquery-1.9.1.js"></script>
        <script src="//ajax.aspnetcdn.com/ajax/jquery.validate/1.9/jquery.validate.min.js"></script>
    
     <script type="text/javascript">
    
     $(document).ready(function() {
    
        $("#display").click(function() {                
    
          $.ajax({    //create an ajax request to display.php
            type: "GET",
            url: "display.php",             
            dataType: "html",   //expect html to be returned                
            success: function(response){                    
                $("#responsecontainer").html(response); 
                //alert(response);
            }
    
        });
    });
    });
    
    </script>
    
    <body>
    <h3 align="center">Manage Student Details</h3>
    <table border="1" align="center">
       <tr>
           <td> <input type="button" id="display" value="Display All Data" /> </td>
       </tr>
    </table>
    <div id="responsecontainer" align="center">
    
    </div>
    </body>
    </html>

<?php
// save this as display.php


    // show errors 
error_reporting(E_ALL);
ini_set('display_errors', 1);
    //errors ends here 
// call the page for connecting to the db
require_once('dbconnector.php');
?>
<?php
$get_member =" SELECT 
empid, lastName, firstName, email, usercode, companyid, userid, jobTitle, cell, employeetype, address ,initials   FROM employees";
$user_coder1 = $con->prepare($get_member);
$user_coder1 ->execute();

echo "<table border='1' >
<tr>
<td align=center> <b>Roll No</b></td>
<td align=center><b>Name</b></td>
<td align=center><b>Address</b></td>
<td align=center><b>Stream</b></td></td>
<td align=center><b>Status</b></td>";

while($row =$user_coder1->fetch(PDO::FETCH_ASSOC)){
$firstName = $row['firstName'];
$empid = $row['empid'];
$lastName =    $row['lastName'];
$cell =    $row['cell'];

    echo "<tr>";
    echo "<td align=center>$firstName</td>";
    echo "<td align=center>$empid</td>";
    echo "<td align=center>$lastName </td>";
    echo "<td align=center>$cell</td>";
    echo "<td align=center>$cell</td>";
    echo "</tr>";
}
echo "</table>";
?>

<?php
// save this as dbconnector.php
function connected_Db(){

    $dsn  = 'mysql:host=localhost;dbname=mydb;charset=utf8';
    $opt  = array(
        PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC
    );
    #echo "Yes we are connected";
    return new PDO($dsn,'username','password', $opt);
    
}
$con = connected_Db();
if($con){
//echo "me  is connected ";
}
else {
//echo "Connection faid ";
exit();
}
?>

File 'app/hero.ts' is not a module error in the console, where to store interfaces files in directory structure with angular2?

I found that not only did I have to restart Visual Studio Code but the node server process as well before I could get a good compile.

HTTP 401 - what's an appropriate WWW-Authenticate header value?

When indicating HTTP Basic Authentication we return something like:

WWW-Authenticate: Basic realm="myRealm"

Whereas Basic is the scheme and the remainder is very much dependent on that scheme. In this case realm just provides the browser a literal that can be displayed to the user when prompting for the user id and password.

You're obviously not using Basic however since there is no point having session expiry when Basic Auth is used. I assume you're using some form of Forms based authentication.

From recollection, Windows Challenge Response uses a different scheme and different arguments.

The trick is that it's up to the browser to determine what schemes it supports and how it responds to them.

My gut feel if you are using forms based authentication is to stay with the 200 + relogin page but add a custom header that the browser will ignore but your AJAX can identify.

For a really good User + AJAX experience, get the script to hang on to the AJAX request that found the session expired, fire off a relogin request via a popup, and on success, resubmit the original AJAX request and carry on as normal.

Avoid the cheat that just gets the script to hit the site every 5 mins to keep the session alive cause that just defeats the point of session expiry.

The other alternative is burn the AJAX request but that's a poor user experience.

Ruby convert Object to Hash

To do this without Rails, a clean way is to store attributes on a constant.

class Gift
  ATTRIBUTES = [:name, :price]
  attr_accessor(*ATTRIBUTES)
end

And then, to convert an instance of Gift to a Hash, you can:

class Gift
  ...
  def to_h
    ATTRIBUTES.each_with_object({}) do |attribute_name, memo|
      memo[attribute_name] = send(attribute_name)
    end
  end
end

This is a good way to do this because it will only include what you define on attr_accessor, and not every instance variable.

class Gift
  ATTRIBUTES = [:name, :price]
  attr_accessor(*ATTRIBUTES)

  def create_random_instance_variable
    @xyz = 123
  end

  def to_h
    ATTRIBUTES.each_with_object({}) do |attribute_name, memo|
      memo[attribute_name] = send(attribute_name)
    end
  end
end

g = Gift.new
g.name = "Foo"
g.price = 5.25
g.to_h
#=> {:name=>"Foo", :price=>5.25}

g.create_random_instance_variable
g.to_h
#=> {:name=>"Foo", :price=>5.25}

How to detect when keyboard is shown and hidden

Swift 3:

NotificationCenter.default.addObserver(self, selector: #selector(viewController.keyboardWillShow(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(viewController.keyboardWillHide(_:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)

func keyboardWillShow(_ notification: NSNotification){
    // Do something here
}

func keyboardWillHide(_ notification: NSNotification){
    // Do something here
}

PHP find difference between two datetimes

I'm not sure what format you're looking for in your difference but here's how to do it using DateTime

$datetime1 = new DateTime();
$datetime2 = new DateTime('2011-01-03 17:13:00');
$interval = $datetime1->diff($datetime2);
$elapsed = $interval->format('%y years %m months %a days %h hours %i minutes %s seconds');
echo $elapsed;

How to get client IP address in Laravel 5+

There are two things to take care of:

Get a helper function that returns a Illuminate\Http\Request and call the ->ip() method:
```
request()->ip();
```
Think of your server configuration, it may use a proxy or load-balancer, especially in an AWS ELB configuration.

If this is your case you need to follow "Configuring Trusted Proxies" or maybe even set a "Trusting All Proxies" option.

Why? Because being your server will be getting your proxy/load-balancer IP instead.

If you are on the AWS balance-loader, go to App\Http\Middleware\TrustProxies and make $proxies declaration look like this:

protected $proxies = '*';

Now test it and celebrate because you just saved yourself from having trouble with throttle middleware. It also relies on request()->ip() and without setting "TrustProxies" up, you could have all your users blocked from logging in instead of blocking only the culprit's IP.

And because throttle middleware is not explained properly in the documentation, I recommend watching "laravel 5.2 tutorial for beginner, API Rate Limiting"

Tested in Laravel 5.7

Programs & Examples On #Hidden

How can I get Eclipse to show .* files?

What's the best way to identify hidden characters in the result of a query in SQL Server (Query Analyzer)?

Windows batch script to unhide files hidden by virus

Hidden property of a button in HTML

Making a button invisible by clicking another button in HTML

Check div is hidden using jquery

How do you create a hidden div that doesn't create a line break or horizontal space?

Make one div visible and another invisible

How to get current formatted date dd/mm/yyyy in Javascript and append it to an input

Make child visible outside an overflow:hidden parent

bootstrap 4 responsive utilities visible / hidden xs sm lg not working

posting hidden value

jQuery - Detect value change on hidden input field

How to use auto-layout to move other views when a view is hidden?

Is there possibility of sum of ArrayList without looping

How to reload .bash_profile from the command line?

How to install ia32-libs in Ubuntu 14.04 LTS (Trusty Tahr)

Saving an Object (Data persistence)

How can I check if the array of objects have duplicate property values?

There is already an object named in the database

ScrollIntoView() causing the whole page to move

How do I increment a DOS variable in a FOR /F loop?

Bigger Glyphicons

How to get a vCard (.vcf file) into Android contacts from website

Encrypt and decrypt a password in Java

Android – Listen For Incoming SMS Messages

How to connect to local instance of SQL Server 2008 Express

Where Is Machine.Config?

How to get the current plugin directory in WordPress?

Getting net::ERR_UNKNOWN_URL_SCHEME while calling telephone number from HTML page in Android

Clear a terminal screen for real

Why is json_encode adding backslashes?

How to create streams from string in Node.Js?

How to get a view table query (code) in SQL Server 2008 Management Studio

Creating layout constraints programmatically

Forcing anti-aliasing using css: Is this a myth?

Finish an activity from another activity

NuGet behind a proxy

HTML inside Twitter Bootstrap popover

Embedding a media player in a website using HTML

Storing and displaying unicode string (??????) using PHP and MySQL

Git says local branch is behind remote branch, but it's not

Delete an element from a dictionary

Split string to equal length substrings in Java

What does "publicPath" in Webpack do?

How to install node.js as windows service?

Transferring files over SSH

How to identify and switch to the frame in selenium webdriver when frame does not have id

AWS S3: The bucket you are attempting to access must be addressed using the specified endpoint

What does "restore purchases" in In-App purchases mean?

Inserting a PDF file in LaTeX

How to get some values from a JSON string in C#?

How to delete all files from a specific folder?

How to replace master branch in Git, entirely, from another branch?

How can I find the first occurrence of a sub-string in a python string?

How to resume Fragment from BackStack if exists

npm global path prefix

Inheritance and init method in Python

How to Make Laravel Eloquent "IN" Query?

How to run a hello.js file in Node.js on windows?

Limiting double to 3 decimal places

Load Image from javascript

Call to a member function on a non-object

jQuery delete confirmation box

What's the difference between dependencies, devDependencies and peerDependencies in npm package.json file?

Dependencies

Dev-Dependencies

Peer Dependencies

Get keys of a Typescript interface as array of strings

Check if array is empty or null

Entity Framework Migrations renaming tables and columns

Selecting Multiple Values from a Dropdown List in Google Spreadsheet

How do I make an input field accept only letters in javaScript?

fopen deprecated warning

What's the purpose of SQL keyword "AS"?

Resource interpreted as Document but transferred with MIME type application/json warning in Chrome Developer Tools

How do you clear the console screen in C?

IsNull function in DB2 SQL?

Using textures in THREE.js

`assets/`

`res/raw/`