PHP Warning: mysqli_connect(): (HY000/2002): Connection refused

Sometimes you need to include mysql db port id in the server like so.

$serverName = "127.0.0.1:3307";

Avoid "current URL string parser is deprecated" warning by setting useNewUrlParser to true

As noted the 3.1.0-beta4 release of the driver got "released into the wild" a little early by the looks of things. The release is part of work in progress to support newer features in the MongoDB 4.0 upcoming release and make some other API changes.

One such change triggering the current warning is the useNewUrlParser option, due to some changes around how passing the connection URI actually works. More on that later.

Until things "settle down", it would probably be advisable to "pin" at least to the minor version for 3.0.x releases:

  "dependencies": {
    "mongodb": "~3.0.8"
  }

That should stop the 3.1.x branch being installed on "fresh" installations to node modules. If you already did install a "latest" release which is the "beta" version, then you should clean up your packages ( and package-lock.json ) and make sure you bump that down to a 3.0.x series release.

As for actually using the "new" connection URI options, the main restriction is to actually include the port on the connection string:

const { MongoClient } = require("mongodb");
const uri = 'mongodb://localhost:27017';  // mongodb://localhost - will fail

(async function() {
  try {

    const client = await MongoClient.connect(uri,{ useNewUrlParser: true });
    // ... anything

    client.close();
  } catch(e) {
    console.error(e)
  }

})()

That's a more "strict" rule in the new code. The main point being that the current code is essentially part of the "node-native-driver" ( npm mongodb ) repository code, and the "new code" actually imports from the mongodb-core library which "underpins" the "public" node driver.

The point of the "option" being added is to "ease" the transition by adding the option to new code so the newer parser ( actually based around url ) is being used in code adding the option and clearing the deprecation warning, and therefore verifying that your connection strings passed in actually comply with what the new parser is expecting.

In future releases the 'legacy' parser would be removed and then the new parser will simply be what is used even without the option. But by that time, it is expected that all existing code had ample opportunity to test their existing connection strings against what the new parser is expecting.

So if you want to start using new driver features as they are released, then use the available beta and subsequent releases and ideally make sure you are providing a connection string which is valid for the new parser by enabling the useNewUrlParser option in MongoClient.connect().

If you don't actually need access to features related to preview of the MongoDB 4.0 release, then pin the version to a 3.0.x series as noted earlier. This will work as documented and "pinning" this ensures that 3.1.x releases are not "updated" over the expected dependency until you actually want to install a stable version.

The type arguments cannot be inferred from the usage. Try specifying the type arguments explicitly

C# compiler have only lambda

arg => arg.MyProperty

for infer type of arg(TModel) an type of arg.MyProperty(TProperty). It's impossible.

Javascript Cookie with no expiration date

There is no syntax for what you want. Not setting expires causes the cookie to expire at the end of the session. The only option is to pick some arbitrarily large value. Be aware that some browsers have problems with dates past 2038 (when unix epoch time exceeds a 32-bit int).

Tomcat view catalina.out log file

It works for me on Ubuntu...
cd var/lib/tomcat7
sudo nano logs/catalina.out

What is the advantage of using heredoc in PHP?

Heredoc's are a great alternative to quoted strings because of increased readability and maintainability. You don't have to escape quotes and (good) IDEs or text editors will use the proper syntax highlighting.

A very common example: echoing out HTML from within PHP:

$html = <<<HTML
  <div class='something'>
    <ul class='mylist'>
      <li>$something</li>
      <li>$whatever</li>
      <li>$testing123</li>
    </ul>
  </div>
HTML;

// Sometime later
echo $html;

It is easy to read and easy to maintain.

The alternative is echoing quoted strings, which end up containing escaped quotes and IDEs aren't going to highlight the syntax for that language, which leads to poor readability and more difficulty in maintenance.

Updated answer for Your Common Sense

Of course you wouldn't want to see an SQL query highlighted as HTML. To use other languages, simply change the language in the syntax:

$sql = <<<SQL
       SELECT * FROM table
SQL;

How to configure postgresql for the first time?

If you're running macOS like I am, you may not have the postgres user.

When trying to run sudo -u postgres psql I was getting the error sudo: unknown user: postgres

Luckily there are executables that postgres provides.

createuser -D /var/postgres/var-10-local --superuser --username=nick
createdb --owner=nick

Then I was able to access psql without issues.

psql
psql (10.2)
Type "help" for help.

nick=#

If you're creating a new postgres instance from scratch, here are the steps I took. I used a non-default port so I could run two instances.

mkdir /var/postgres/var-10-local
pg_ctl init -D /var/postgres/var-10-local

Then I edited /var/postgres/var-10-local/postgresql.conf with my preferred port, 5433.

/Applications/Postgres.app/Contents/Versions/10/bin/postgres -D /Users/nick/Library/Application\ Support/Postgres/var-10-local -p 5433

createuser -D /var/postgres/var-10-local --superuser --username=nick --port=5433
createdb --owner=nick --port=5433

Done!

How do I compare version numbers in Python?

Use packaging.version.parse.

>>> from packaging import version
>>> version.parse("2.3.1") < version.parse("10.1.2")
True
>>> version.parse("1.3.a4") < version.parse("10.1.2")
True
>>> isinstance(version.parse("1.3.a4"), version.Version)
True
>>> isinstance(version.parse("1.3.xy123"), version.LegacyVersion)
True
>>> version.Version("1.3.xy123")
Traceback (most recent call last):
...
packaging.version.InvalidVersion: Invalid version: '1.3.xy123'

packaging.version.parse is a third-party utility but is used by setuptools (so you probably already have it installed) and is conformant to the current PEP 440; it will return a packaging.version.Version if the version is compliant and a packaging.version.LegacyVersion if not. The latter will always sort before valid versions.

Note: packaging has recently been vendored into setuptools.

An ancient alternative still used by a lot of software is distutils.version, built in but undocumented and conformant only to the superseded PEP 386;

>>> from distutils.version import LooseVersion, StrictVersion
>>> LooseVersion("2.3.1") < LooseVersion("10.1.2")
True
>>> StrictVersion("2.3.1") < StrictVersion("10.1.2")
True
>>> StrictVersion("1.3.a4")
Traceback (most recent call last):
...
ValueError: invalid version number '1.3.a4'

As you can see it sees valid PEP 440 versions as “not strict” and therefore doesn’t match modern Python’s notion of what a valid version is.

As distutils.version is undocumented, here's the relevant docstrings.

How to use Git?

I think gitready is a great starting point. I'm using git for a project now and that site pretty much got the ball rolling for me.

Web Application Problems (web.config errors) HTTP 500.19 with IIS7.5 and ASP.NET v2

Aha! I beat this problem! My god, it was a beast for someone like me with limited IIS experience. I really thought I was going to be spending all weekend fixing it.

Here's the solution for anyone else who ever comes this evil problem.

First thing to be aware of: If you're hoping this is your solution, make sure that you have the same Error Code (0x8007000d) and Config Source (-1: 0:). If not, this isn't your solution.

Next thing to be aware of: AJAX is not properly installed in your web.config!

Fix that by following this guide:
http://www.asp.net/AJAX/documentation/live/ConfiguringASPNETAJAX.aspx

Then, install the AJAX 1.0 extensions on your production server, from this link:

http://www.asp.net/ajax/downloads/archive/
Update: Microsoft seems to have removed the above page :(

That's it!

How to Empty Caches and Clean All Targets Xcode 4 and later

I have been pulling out hair from my head because I thought that I had the same problem. When building the app I didn't get the same result on my iPhone as on the simulator.

The problem was that I had somehow made a localized version of the MainStoryboard.storyboard file. So when I ran the app on my phone it showed the danish version... and the simulator showed the english version.

Yeah I'm new! :)

How do you do dynamic / dependent drop downs in Google Sheets?

You can start with a google sheet set up with a main page and drop down source page like shown below.

You can set up the first column drop down through the normal Data > Validations menu prompts.

Main Page

Main Page with the drop down for the first column already populated.

Drop Down Source Page

Source page for all of the sub-categories needed

After that, you need to set up a script with the name onEdit. (If you don't use that name, the getActiveRange() will do nothing but return cell A1)

And use the code provided here:

function onEdit() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = SpreadsheetApp.getActiveSheet();
  var myRange = SpreadsheetApp.getActiveRange();
  var dvSheet = SpreadsheetApp.getActiveSpreadsheet().getSheetByName("Categories");
  var option = new Array();
  var startCol = 0;

  if(sheet.getName() == "Front Page" && myRange.getColumn() == 1 && myRange.getRow() > 1){
    if(myRange.getValue() == "Category 1"){
      startCol = 1;
    } else if(myRange.getValue() == "Category 2"){
      startCol = 2;
    } else if(myRange.getValue() == "Category 3"){
      startCol = 3;
    } else if(myRange.getValue() == "Category 4"){
      startCol = 4;
    } else {
      startCol = 10
    }

  if(startCol > 0 && startCol < 10){
    option = dvSheet.getSheetValues(3,startCol,10,1);
    var dv = SpreadsheetApp.newDataValidation();
    dv.setAllowInvalid(false);  
    //dv.setHelpText("Some help text here");
    dv.requireValueInList(option, true);
    sheet.getRange(myRange.getRow(),myRange.getColumn() + 1).setDataValidation(dv.build());
   }

  if(startCol == 10){
    sheet.getRange(myRange.getRow(),myRange.getColumn() + 1).clearDataValidations();
  } 
  }
}

After that, set up a trigger in the script editor screen by going to Edit > Current Project Triggers. This will bring up a window to have you select various drop downs to eventually end up at this:

Trigger set up

You should be good to go after that!

DateTime group by date and hour

Using MySQL I usually do it that way:

SELECT count( id ), ...
FROM quote_data
GROUP BY date_format( your_date_column, '%Y%m%d%H' )
order by your_date_column desc;

Or in the same idea, if you need to output the date/hour:

SELECT count( id ) , date_format( your_date_column, '%Y-%m-%d %H' ) as my_date
FROM  your_table 
GROUP BY my_date
order by your_date_column desc;

If you specify an index on your date column, MySQL should be able to use it to speed up things a little.

Overwriting txt file in java

SOLVED

My biggest "D'oh" moment! I've been compiling it on Eclipse rather than cmd which was where I was executing it. So my newly compiled classes went to the bin folder and the compiled class file via command prompt remained the same in my src folder. I recompiled with my new code and it works like a charm.

File fold = new File("../playlist/" + existingPlaylist.getText() + ".txt");
fold.delete();

File fnew = new File("../playlist/" + existingPlaylist.getText() + ".txt");

String source = textArea.getText();
System.out.println(source);

try {
    FileWriter f2 = new FileWriter(fnew, false);
    f2.write(source);
    f2.close();

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

What are the ways to make an html link open a folder

You can also copy the link address and paste it in a new window to get around the security. This works in chrome and firefox but you may have to add slashes in firefox.

How to make a script wait for a pressed key?

I am new to python and I was already thinking I am too stupid to reproduce the simplest suggestions made here. It turns out, there's a pitfall one should know:

When a python-script is executed from IDLE, some IO-commands seem to behave completely different (as there is actually no terminal window).

Eg. msvcrt.getch is non-blocking and always returns $ff. This has already been reported long ago (see e.g. https://bugs.python.org/issue9290 ) - and it's marked as fixed, somehow the problem seems to persist in current versions of python/IDLE.

So if any of the code posted above doesn't work for you, try running the script manually, and NOT from IDLE.

Why do I have ORA-00904 even when the column is present?

Its due to mismatch between column name defined in entity and the column name of table (in SQL db )

java.sql.SQLException: ORA-00904: "table_name"."column_name": invalid identifier e.g.java.sql.SQLException: ORA-00904: "STUDENT"."NAME": invalid identifier

issue can be like in Student.java(entity file)
You have mentioned column name as "NAME" only.
But in STUDENT table ,column name is lets say "NMAE"

How can I brew link a specific version?

if @simon's answer is not working in some of the mac's please follow the below process.

If you have already installed swiftgen using the following commands:

$ brew update $ brew install swiftgen

then follow the steps below in order to run swiftgen with older version.

Step 1: brew uninstall swiftgen Step 2: Navigate to: https://github.com/SwiftGen/SwiftGen/releases and download the swiftgen with version: swiftgen-4.2.0.zip.

Unzip the package in any of the directories.

Step 3: Execute the following in a terminal:

$ mkdir -p ~/dependencies/swiftgen
$ cp -R ~/<your_directory_name>/swiftgen-4.2.0/ ~/dependencies/swiftgen
$ cd /usr/local/bin
$ ln -s ~/dependencies/swiftgen/bin/swiftgen swiftgen
$ mkdir ~/Library/Application\ Support/SwiftGen
$ ln -s ~/dependencies/swiftgen/templates/ ~/Library/Application\ Support/SwiftGen/

$ swiftgen --version

You should get: SwiftGen v0.0 (Stencil v0.8.0, StencilSwiftKit v1.0.0, SwiftGenKit v1.0.1)

How to convert current date into string in java?

Use a DateFormat implementation; e.g. SimpleDateFormat.

DateFormat df = new SimpleDateFormat("dd/MM/yyyy");
String data = df.format(new Date());

Load external css file like scripts in jquery which is compatible in ie also

In jQuery 1.4:

$("<link/>", {
   rel: "stylesheet",
   type: "text/css",
   href: "/styles/yourcss.css"
}).appendTo("head");

http://api.jquery.com/jQuery/#jQuery2

join list of lists in python

This is known as flattening, and there are a LOT of implementations out there:

How about this, although it will only work for 1 level deep nesting:

>>> x = [["a","b"], ["c"]]
>>> for el in sum(x, []):
...     print el
...
a
b
c

From those links, apparently the most complete-fast-elegant-etc implementation is the following:

def flatten(l, ltypes=(list, tuple)):
    ltype = type(l)
    l = list(l)
    i = 0
    while i < len(l):
        while isinstance(l[i], ltypes):
            if not l[i]:
                l.pop(i)
                i -= 1
                break
            else:
                l[i:i + 1] = l[i]
        i += 1
    return ltype(l)

How do I make a column unique and index it in a Ruby on Rails migration?

I'm using Rails 5 and the above answers work great; here's another way that also worked for me (the table name is :people and the column name is :email_address)

class AddIndexToEmailAddress < ActiveRecord::Migration[5.0]
  def change
    change_table :people do |t|
      t.index :email_address, unique: true
    end
  end
end

How to set the env variable for PHP?

You May use set keyword for set the path

set path=%path%;c:/wamp/bin/php/php5.3.0

if all the path are set in path variables

If you want to see all path list. you can use

set %path%

you need to append your php path behind this path.

This is how you can set environment variable.

Converting file into Base64String and back again

private String encodeFileToBase64Binary(File file){    
String encodedfile = null;  
try {  
    FileInputStream fileInputStreamReader = new FileInputStream(file);  
    byte[] bytes = new byte[(int)file.length()];
    fileInputStreamReader.read(bytes);  
    encodedfile = Base64.encodeBase64(bytes).toString();  
} catch (FileNotFoundException e) {  
    // TODO Auto-generated catch block  
    e.printStackTrace();  
} catch (IOException e) {  
    // TODO Auto-generated catch block  
    e.printStackTrace();  
}  
    return encodedfile;  
}

Find mouse position relative to element

Original answer said to put it in an iframe. The better solution is to use the events offsetX and offsetY on a canvas that has the padding set to 0px.

<html>
<body>
<script>

var main=document.createElement('canvas');
main.width="200";
main.height="300";
main.style="padding:0px;margin:30px;border:thick dashed red";
document.body.appendChild(main);

// adding event listener

main.addEventListener('mousemove',function(e){
    var ctx=e.target.getContext('2d');
    var c=Math.floor(Math.random()*0xFFFFFF);
    c=c.toString(16); for(;c.length<6;) c='0'+c;
    ctx.strokeStyle='#'+c;
    ctx.beginPath();
    ctx.arc(e.offsetX,e.offsetY,3,0,2*Math.PI);
    ctx.stroke();
    e.target.title=e.offsetX+' '+e.offsetY;
    });

// it worked! move mouse over window

</script>
</body>
</html>

git push rejected: error: failed to push some refs

If you are the only the person working on the project, what you can do is:

 git checkout master
 git push origin +HEAD

This will set the tip of origin/master to the same commit as master (and so delete the commits between 41651df and origin/master)

SQL - How to select a row having a column with max value

Technically, this is the same answer as @Sujee. It also depends on your version of Oracle as to whether it works. (I think this syntax was introduced in Oracle 12??)

SELECT *
FROM   table
ORDER BY value DESC, date_column ASC
FETCH  first 1 rows only;

As I say, if you look under the bonnet, I think this code is unpacked internally by the Oracle Optimizer to read like @Sujee's. However, I'm a sucker for pretty coding, and nesting select statements without a good reason does not qualify as beautiful!! :-P

Compare dates in MySQL

I got the answer.

Here is the code:

SELECT * FROM table
WHERE STR_TO_DATE(column, '%d/%m/%Y')
  BETWEEN STR_TO_DATE('29/01/15', '%d/%m/%Y')
    AND STR_TO_DATE('07/10/15', '%d/%m/%Y')

How to start and stop android service from a adb shell?

Starting a service:

adb shell am startservice ...

start a Service. Options are: --user | current: Specify which user to run as; if not specified then run as the current user.

Stopping a service:

adb shell am stopservice ...

stop a Service. Options are: --user | current: Specify which user to run as; if not specified then run as the current user.

How to convert JSONObjects to JSONArray?

Your response should be something like this to be qualified as Json Array.

{
  "songs":[
    {"2562862600": {"id":"2562862600", "pos":1}},  
    {"2562862620": {"id":"2562862620", "pos":1}},  
    {"2562862604": {"id":"2562862604", "pos":1}},  
    {"2573433638": {"id":"2573433638", "pos":1}}
  ]
}

You can parse your response as follows

String resp = ...//String output from your source
JSONObject ob = new JSONObject(resp);  
JSONArray arr = ob.getJSONArray("songs");

for(int i=0; i<arr.length(); i++){   
  JSONObject o = arr.getJSONObject(i);  
  System.out.println(o);  
}

How to call a REST web service API from JavaScript?

Without a doubt, the simplest method uses an invisible FORM element in HTML specifying the desired REST method. Then the arguments can be inserted into input type=hidden value fields using JavaScript and the form can be submitted from the button click event listener or onclick event using one line of JavaScript. Here is an example that assumes the REST API is in file REST.php:

<body>
<h2>REST-test</h2>
<input type=button onclick="document.getElementById('a').submit();"
    value="Do It">
<form id=a action="REST.php" method=post>
<input type=hidden name="arg" value="val">
</form>
</body>

Note that this example will replace the page with the output from page REST.php. I'm not sure how to modify this if you wish the API to be called with no visible effect on the current page. But it's certainly simple.

Get column index from column name in python pandas

Here is a solution through list comprehension. cols is the list of columns to get index for:

[df.columns.get_loc(c) for c in cols if c in df]

Adding class to element using Angular JS

Try this..

If jQuery is available, angular.element is an alias for the jQuery function.

var app = angular.module('myApp',[]);

app.controller('Ctrl', function($scope) {

    $scope.click=function(){

      angular.element('#div1').addClass("alpha");
    };
});
<div id='div1'>Text</div>
<button ng-click="click()">action</button>

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

Wait until all promises complete even if some rejected

Instead of rejecting, resolve it with a object. You could do something like this when you are implementing promise

_x000D_

const promise = arg => {_x000D_
  return new Promise((resolve, reject) => {_x000D_
      setTimeout(() => {_x000D_
        try{_x000D_
          if(arg != 2)_x000D_
            return resolve({success: true, data: arg});_x000D_
          else_x000D_
            throw new Error(arg)_x000D_
        }catch(e){_x000D_
          return resolve({success: false, error: e, data: arg})_x000D_
        }_x000D_
      }, 1000);_x000D_
  })_x000D_
}_x000D_
_x000D_
Promise.all([1,2,3,4,5].map(e => promise(e))).then(d => console.log(d))

_x000D_

How to write a:hover in inline CSS?

I agree with shadow. You could use the onmouseover and onmouseout event to change the CSS via JavaScript.

And don't say people need to have JavaScript activated. It's only a style issue, so it doesn't matter if there are some visitors without JavaScript ;) Although most of Web 2.0 works with JavaScript. See Facebook for example (lots of JavaScript) or Myspace.

Explicit vs implicit SQL joins

Performance wise, it should not make any difference. The explicit join syntax seems cleaner to me as it clearly defines relationships between tables in the from clause and does not clutter up the where clause.

How do I filter an array with TypeScript in Angular 2?

You can check an example in Plunker over here plunker example filters

filter() {

    let storeId = 1;
    this.bookFilteredList = this.bookList
                                .filter((book: Book) => book.storeId === storeId);
    this.bookList = this.bookFilteredList; 
}

How can I read a text file from the SD card in Android?

BufferedReader br = null;
try {
        String fpath = Environment.getExternalStorageDirectory() + <your file name>;
        try {
            br = new BufferedReader(new FileReader(fpath));
        } catch (FileNotFoundException e1) {
            e1.printStackTrace();
        }
        String line = "";
        while ((line = br.readLine()) != null) {
         //Do something here 
        }

Redirecting exec output to a buffer or file

After forking, use dup2(2) to duplicate the file's FD into stdout's FD, then exec.

How to configure SMTP settings in web.config

Set IIS to forward your mail to the remote server. The specifics vary greatly depending on the version of IIS. For IIS 7.5:

Open IIS Manager
Connect to your server if needed
Select the server node; you should see an SMTP option on the right in the ASP.NET section
Double-click the SMTP icon.
Select the "Deliver e-mail to SMTP server" option and enter your server name, credentials, etc.

How to print a debug log?

You can use error_log to send to your servers error log file (or an optional other file if you'd like)

Testing two JSON objects for equality ignoring child order in Java

For org.json I've rolled out my own solution, a method that compares to JSONObject instances. I didn't work with complex JSON objects in that project, so I don't know whether this works in all scenarios. Also, given that I use this in unit tests, I didn't put effort into optimizations. Here it is:

public static boolean jsonObjsAreEqual (JSONObject js1, JSONObject js2) throws JSONException {
    if (js1 == null || js2 == null) {
        return (js1 == js2);
    }

    List<String> l1 =  Arrays.asList(JSONObject.getNames(js1));
    Collections.sort(l1);
    List<String> l2 =  Arrays.asList(JSONObject.getNames(js2));
    Collections.sort(l2);
    if (!l1.equals(l2)) {
        return false;
    }
    for (String key : l1) {
        Object val1 = js1.get(key);
        Object val2 = js2.get(key);
        if (val1 instanceof JSONObject) {
            if (!(val2 instanceof JSONObject)) {
                return false;
            }
            if (!jsonObjsAreEqual((JSONObject)val1, (JSONObject)val2)) {
                return false;
            }
        }

        if (val1 == null) {
            if (val2 != null) {
                return false;
            }
        }  else if (!val1.equals(val2)) {
            return false;
        }
    }
    return true;
}

Cannot connect to the Docker daemon at unix:/var/run/docker.sock. Is the docker daemon running?

First, try with sudo, as the current user may not have access permissions to communicate to docker daemon i.e. /var/run/docker.sock

If its still not working, then, after the installation, simply stop the docker daemon as,

$ sudo service docker stop

And, run the following command to start the daemon in background,

$ sudo nohup docker daemon -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

To make working with Docker easier, you should add your username to the Docker users group. Adding a user to the group can be done with the command below

$ sudo usermod -aG docker $USER

Also, this step is mention at official documentation of docker Post-installation steps for Linux (https://docs.docker.com/engine/installation/linux/linux-postinstall/)

The Ubuntu 16.04 users can follow these steps,

Inside file /lib/systemd/system/docker.service change: ExecStart=/usr/bin/dockerd fd:// with ExecStart=/usr/bin/dockerd -H tcp://0.0.0.0:2375

Inside file /etc/init.d/docker change:

DOCKER_OPTS= with DOCKER_OPTS="-H ****tcp://0.0.0.0:2375 "

and then restart your machine. And, start playing with docker.

How to connect Robomongo to MongoDB

Comment out the /etc/mongod.conf file's bind_ip
Download https://download.robomongo.org/0.9.0-rc9/windows/robomongo-0.9.0-rc9-windows-x86_64-0bb5668.exe
Connection tab:

3.1 Name (whatever)

3.2 Address (IP address of the server) : Port number (27017)
SSH tab (I used my normal PuTTY connection details)

4.1 SSH Address: (IP address of server)

4.2 SSH User Name (User Name)

4.3 User Password (password)

Jenkins Pipeline Wipe Out Workspace

In fact the deleteDir function recursively deletes the current directory and its contents. Symbolic links and junctions will not be followed but will be removed.

To delete a specific directory of a workspace wrap the deleteDir step in a dir step.

dir('directoryToDelete') {
    deleteDir()
}

Bring a window to the front in WPF

Well, since this is such a hot topic... here is what works for me. I got errors if I didn't do it this way because Activate() will error out on you if you cannot see the window.

Xaml:

<Window .... 
        Topmost="True" 
        .... 
        ContentRendered="mainWindow_ContentRendered"> .... </Window>

Codebehind:

private void mainWindow_ContentRendered(object sender, EventArgs e)
{
    this.Topmost = false;
    this.Activate();
    _UsernameTextBox.Focus();
}

This was the only way for me to get the window to show on top. Then activate it so you can type in the box without having to set focus with the mouse. control.Focus() wont work unless the window is Active();

How can I get relative path of the folders in my android project?

File relativeFile = new File(getClass().getResource("/icons/forIcon.png").toURI());
myJFrame.setIconImage(tk.getImage(relativeFile.getAbsolutePath()));

Find all elements with a certain attribute value in jquery

Use string concatenation. Try this:

$('div[imageId="'+imageN +'"]').each(function() {
    $(this);   
});

Which data structures and algorithms book should I buy?

If you want the algorithms to be implemented specifically in Java then there is Mitchell Waite's Series book "Data Structures & Algorithms in Java". It starts from basic data structures like linked lists, stacks and queues, and the basic algorithms for sorting and searching. Working your way through it you will eventually get to Tree data structures, Red-Black trees, 2-3 trees and Graphs.

All-in-all its not an extremely theoretical book, but if you just want an introduction in a language you are familiar with then its a good book. At the end of the day, if you want a deeper understanding of algorithms you're going to have to learn some of the more theoretical concepts, and read one of the classics, like Cormen/Leiserson/Rivest/Stein's Introduction to Algorithms.

var.replace is not a function

You should use toString() Method of java script for the convert into string before because replace method is a string function.

How to upgrade PowerShell version from 2.0 to 3.0

Just run this in a console.

@powershell -NoProfile -ExecutionPolicy unrestricted -Command "iex ((new-object net.webclient).DownloadString('https://chocolatey.org/install.ps1'))" && SET PATH=%PATH%;%systemdrive%\chocolatey\bin
cinst powershell

It installs the latest version using a Chocolatey repository.

Originally I was using command cinst powershell 3.0.20121027, but it looks like it later stopped working. Since this question is related to PowerShell 3.0 this was the right way. At this moment (June 26, 2014) cinst powershell refers to version 3.0 of PowerShell, and that may change in future.

See the Chocolatey PowerShell package page for details on what version will be installed.

Disable arrow key scrolling in users browser

Summary

Simply prevent the default browser action:

window.addEventListener("keydown", function(e) {
    // space and arrow keys
    if([32, 37, 38, 39, 40].indexOf(e.code) > -1) {
        e.preventDefault();
    }
}, false);

If you need to support Internet Explorer or other older browsers, use e.keyCode instead of e.code, but keep in mind that keyCode is deprecated.

Original answer

I used the following function in my own game:

var keys = {};
window.addEventListener("keydown",
    function(e){
        keys[e.code] = true;
        switch(e.code){
            case 37: case 39: case 38:  case 40: // Arrow keys
            case 32: e.preventDefault(); break; // Space
            default: break; // do not block other keys
        }
    },
false);
window.addEventListener('keyup',
    function(e){
        keys[e.code] = false;
    },
false);

The magic happens in e.preventDefault();. This will block the default action of the event, in this case moving the viewpoint of the browser.

If you don't need the current button states you can simply drop keys and just discard the default action on the arrow keys:

var arrow_keys_handler = function(e) {
    switch(e.code){
        case 37: case 39: case 38:  case 40: // Arrow keys
        case 32: e.preventDefault(); break; // Space
        default: break; // do not block other keys
    }
};
window.addEventListener("keydown", arrow_keys_handler, false);

Note that this approach also enables you to remove the event handler later if you need to re-enable arrow key scrolling:

window.removeEventListener("keydown", arrow_keys_handler, false);

References

How to access data/data folder in Android device?

If you are using Android Studio 3.0 or later version then follow these steps.

Click View > Tool Windows > Device File Explorer.
Expand /data/data/[package-name] nodes.

You can only expand packages which runs in debug mode on non-rooted device.

How to Edit a row in the datatable

Try this I am also not 100 % sure

        for( int i = 0 ;i< dt.Rows.Count; i++)
        {
           If(dt.Rows[i].Product_id == 2)
           {
              dt.Rows[i].Columns["Product_name"].ColumnName = "cde";
           }
        }

How to create a new variable in a data.frame based on a condition?

If you have a very limited number of levels, you could try converting y into factor and change its levels.

> xy <- data.frame(x = c(1, 2, 4), y = c(1, 4, 5))
> xy$w <- as.factor(xy$y)
> levels(xy$w) <- c("good", "fair", "bad")
> xy
  x y    w
1 1 1 good
2 2 4 fair
3 4 5  bad

Tracing XML request/responses with JAX-WS

// This solution provides a way programatically add a handler to the web service clien w/o the XML config

// See full doc here: http://docs.oracle.com/cd/E17904_01//web.1111/e13734/handlers.htm#i222476

// Create new class that implements SOAPHandler

public class LogMessageHandler implements SOAPHandler<SOAPMessageContext> {

@Override
public Set<QName> getHeaders() {
    return Collections.EMPTY_SET;
}

@Override
public boolean handleMessage(SOAPMessageContext context) {
    SOAPMessage msg = context.getMessage(); //Line 1
    try {
        msg.writeTo(System.out);  //Line 3
    } catch (Exception ex) {
        Logger.getLogger(LogMessageHandler.class.getName()).log(Level.SEVERE, null, ex);
    } 
    return true;
}

@Override
public boolean handleFault(SOAPMessageContext context) {
    return true;
}

@Override
public void close(MessageContext context) {
}
}

// Programatically add your LogMessageHandler

   com.csd.Service service = null;
    URL url = new URL("https://service.demo.com/ResService.svc?wsdl");

    service = new com.csd.Service(url);

    com.csd.IService port = service.getBasicHttpBindingIService();
    BindingProvider bindingProvider = (BindingProvider)port;
    Binding binding = bindingProvider.getBinding();
    List<Handler> handlerChain = binding.getHandlerChain();
    handlerChain.add(new LogMessageHandler());
    binding.setHandlerChain(handlerChain);

How to get AM/PM from a datetime in PHP

It is quite easy. Assuming you have a field(dateposted) with the type "timestamp" in your database table already queried and you want to display it, have it formated and also have the AM/PM, all you need do is shown below.

     <?php
     echo date("F j, Y h:m:s A" ,strtotime($row_rshearing['dateposted'])); 


    ?>

Note: Your OUTPUT should look some what like this depending on the date posted

May 21, 2014 03:05:27 PM

What does the 'static' keyword do in a class?

It means that there is only one instance of "clock" in Hello, not one per each separate instance of the "Hello" class, or more-so, it means that there will be one commonly shared "clock" reference among all instances of the "Hello" class.

So if you were to do a "new Hello" anywhere in your code: A- in the first scenario (before the change, without using "static"), it would make a new clock every time a "new Hello" is called, but B- in the second scenario (after the change, using "static"), every "new Hello" instance would still share and use the initial and same "clock" reference first created.

Unless you needed "clock" somewhere outside of main, this would work just as well:

package hello;
public class Hello
{
    public static void main(String args[])
    {
      Clock clock=new Clock();
      clock.sayTime();    
    }
}

Should you use .htm or .html file extension? What is the difference, and which file is correct?

It's the same in terms of functionality and support. (most OS recognize both, most Search Engines recognize both)

For my everyday use, I choose .htm because it's shorter to type by 25%.

Android: How to create a Dialog without a title?

dialog_custom .requestWindowFeature(Window.FEATURE_NO_TITLE);

this will remove title from cutsom dialog.

Note add these line before adding content.. for eg

     dialog_custom = Dialog(activity!!)
    dialog_custom.requestWindowFeature(Window.FEATURE_NO_TITLE)
    dialog_custom.setContentView(R.layout.select_vehicle_type)
    dialog_custom.setCanceledOnTouchOutside(false)
    dialog_custom.setCancelable(true)

Closing a file after File.Create

File.Create returns a FileStream object that you can call Close() on.

Convert date to datetime in Python

Do I really have to manually call datetime(d.year, d.month, d.day)

No, you'd rather like to call

date_to_datetime(dt)

which you can implement once in some utils/time.py in your project:

from typing import Optional
from datetime import date, datetime

def date_to_datetime(
    dt: date,
    hour: Optional[int] = 0,
    minute: Optional[int] = 0, 
    second: Optional[int] = 0) -> datetime:

    return datetime(dt.year, dt.month, dt.day, hour, minute, second)

How do I convert struct System.Byte byte[] to a System.IO.Stream object in C#?

The general approach to write to any stream (not only MemoryStream) is to use BinaryWriter:

static void Write(Stream s, Byte[] bytes)
{
    using (var writer = new BinaryWriter(s))
    {
        writer.Write(bytes);
    }
}

Looking for a short & simple example of getters/setters in C#

As far as I understand getters and setters are to improve encapsulation. There is nothing complex about them in C#.

You define a property of on object like this:

int m_colorValue = 0;
public int Color 
{
   set { m_colorValue = value; }
   get { return m_colorValue; }
}

This is the most simple use. It basically sets an internal variable or retrieves its value. You use a Property like this:

someObject.Color = 222; // sets a color 222
int color = someObject.Color // gets the color of the object

You could eventually do some processing on the value in the setters or getters like this:

public int Color 
{
   set { m_colorValue = value + 5; }
   get { return m_colorValue  - 30; }
}

if you skip set or get, your property will be read or write only. That's how I understand the stuff.

How to list all databases in the mongo shell?

For database list:

show databases
show dbs

For table/collection list:

show collections
show tables
db.getCollectionNames()

All shards failed

It is possible on your restart some shards were not recovered, causing the cluster to stay red.
If you hit:
http://<yourhost>:9200/_cluster/health/?level=shards you can look for red shards.

I have had issues on restart where shards end up in a non recoverable state. My solution was to simply delete that index completely. That is not an ideal solution for everyone.

It is also nice to visualize issues like this with a plugin like:
Elasticsearch Head

Dismissing a Presented View Controller

Swift 3.0 //Dismiss View Controller in swift

self.navigationController?.popViewController(animated: true)
dismiss(animated: true, completion: nil)

jQuery - Increase the value of a counter when a button is clicked

You are trying to set "++" on a jQuery element!

YOu could declare a js variable

var counter = 0;

and in jQuery code do:

$("#counter").html(counter++);

Can't install laravel installer via composer

It says that it requires zip extension

laravel/installer v1.4.0 requires ext-zip...

Install using (to install the default version):

sudo apt install php-zip

Or, if you're running a specific version of PHP:

# For php v7.0
sudo apt-get install php7.0-zip

# For php v7.1
sudo apt-get install php7.1-zip

# For php v7.2
sudo apt-get install php7.2-zip

# For php v7.3
sudo apt-get install php7.3-zip

# For php v7.4
sudo apt-get install php7.4-zip

Can you explain the HttpURLConnection connection process?

On which point does HTTPURLConnection try to establish a connection to the given URL?

On the port named in the URL if any, otherwise 80 for HTTP and 443 for HTTPS. I believe this is documented.

On which point can I know that I was able to successfully establish a connection?

When you call getInputStream() or getOutputStream() or getResponseCode() without getting an exception.

Are establishing a connection and sending the actual request done in one step/method call? What method is it?

No and none.

Can you explain the function of getOutputStream() and getInputStream() in layman's term?

Either of them first connects if necessary, then returns the required stream.

I notice that when the server I'm trying to connect to is down, I get an Exception at getOutputStream(). Does it mean that HTTPURLConnection will only start to establish a connection when I invoke getOutputStream()? How about the getInputStream()? Since I'm only able to get the response at getInputStream(), then does it mean that I didn't send any request at getOutputStream() yet but simply establishes a connection? Do HttpURLConnection go back to the server to request for response when I invoke getInputStream()?

See above.

Am I correct to say that openConnection() simply creates a new connection object but does not establish any connection yet?

Yes.

How can I measure the read overhead and connect overhead?

Connect: take the time getInputStream() or getOutputStream() takes to return, whichever you call first. Read: time from starting first read to getting the EOS.

PHP Excel Header

The problem is you typed the wrong file extension for excel file. you used .xsl instead of xls.

I know i came in late but it can help future readers of this post.

C# Parsing JSON array of objects

string jsonData1=@"[{""name"":""0"",""price"":""40"",""count"":""1"",""productId"":""4"",""catid"":""4"",""productTotal"":""40"",""orderstatus"":""0"",""orderkey"":""123456789""}]";

                  string jsonData = jsonData1.Replace("\"", "");


                  DataSet ds = new DataSet();
                  DataTable dt = new DataTable();
       JArray array= JArray.Parse(jsonData);

couldnot parse , if the vaule is a string..

look at name : meals , if name : 1 then it will parse

How do I set up HttpContent for my HttpClient PostAsync second parameter?

    public async Task<ActionResult> Index()
    {
        apiTable table = new apiTable();
        table.Name = "Asma Nadeem";
        table.Roll = "6655";

        string str = "";
        string str2 = "";

        HttpClient client = new HttpClient();

        string json = JsonConvert.SerializeObject(table);

        StringContent httpContent = new StringContent(json, System.Text.Encoding.UTF8, "application/json");

        var response = await client.PostAsync("http://YourSite.com/api/apiTables", httpContent);

        str = "" + response.Content + " : " + response.StatusCode;

        if (response.IsSuccessStatusCode)
        {       
            str2 = "Data Posted";
        }

        return View();
    }

OR operator in switch-case?

What are the backgrounds for a switch-case to not accept this operator?

Because case requires constant expression as its value. And since an || expression is not a compile time constant, it is not allowed.

From JLS Section 14.11:

Switch label should have following syntax:

SwitchLabel:
case ConstantExpression :
case EnumConstantName :
default :

Under the hood:

The reason behind allowing just constant expression with cases can be understood from the JVM Spec Section 3.10 - Compiling Switches:

Compilation of switch statements uses the tableswitch and lookupswitch instructions. The tableswitch instruction is used when the cases of the switch can be efficiently represented as indices into a table of target offsets. The default target of the switch is used if the value of the expression of the switch falls outside the range of valid indices.

So, for the cases label to be used by tableswitch as a index into the table of target offsets, the value of the case should be known at compile time. That is only possible if the case value is a constant expression. And || expression will be evaluated at runtime, and the value will only be available at that time.

From the same JVM section, the following switch-case:

switch (i) {
    case 0:  return  0;
    case 1:  return  1;
    case 2:  return  2;
    default: return -1;
}

is compiled to:

0   iload_1             // Push local variable 1 (argument i)
1   tableswitch 0 to 2: // Valid indices are 0 through 2  (NOTICE This instruction?)
      0: 28             // If i is 0, continue at 28
      1: 30             // If i is 1, continue at 30
      2: 32             // If i is 2, continue at 32
      default:34        // Otherwise, continue at 34
28  iconst_0            // i was 0; push int constant 0...
29  ireturn             // ...and return it
30  iconst_1            // i was 1; push int constant 1...
31  ireturn             // ...and return it
32  iconst_2            // i was 2; push int constant 2...
33  ireturn             // ...and return it
34  iconst_m1           // otherwise push int constant -1...
35  ireturn             // ...and return it

So, if the case value is not a constant expressions, compiler won't be able to index it into the table of instruction pointers, using tableswitch instruction.

Abort Ajax requests using jQuery

You can abort any continuous ajax call by using this

<input id="searchbox" name="searchbox" type="text" />

<script src="http://code.jquery.com/jquery-1.11.0.min.js"></script>
<script type="text/javascript">
     var request = null;
        $('#searchbox').keyup(function () {
            var id = $(this).val();
            request = $.ajax({
                type: "POST", //TODO: Must be changed to POST
                url: "index.php",
                data: {'id':id},
                success: function () {
    
                },
                beforeSend: function () {
                    if (request !== null) {
                        request.abort();
                    }
                }
            });
        });
</script>

How to change mysql to mysqli?

The ultimate guide to upgrading `mysql_*` functions to MySQLi API

The reason for the new mysqli extension was to take advantage of new features found in MySQL systems versions 4.1.3 and newer. When changing your existing code from mysql_* to mysqli API you should avail of these improvements, otherwise your upgrade efforts could go in vain.
The mysqli extension has a number of benefits, the key enhancements over the mysql extension being:

Object-oriented interface
Support for Prepared Statements
Enhanced debugging capabilities

When upgrading from mysql_* functions to MySQLi, it is important to take these features into consideration, as well as some changes in the way this API should be used.

1. Object-oriented interface versus procedural functions.

The new mysqli object-oriented interface is a big improvement over the older functions and it can make your code cleaner and less susceptible to typographical errors. There is also the procedural version of this API, but its use is discouraged as it leads to less readable code, which is more prone to errors.

To open new connection to the database with MySQLi you need to create new instance of MySQLi class.

$mysqli = new \mysqli($host, $user, $password, $dbName);
$mysqli->set_charset('utf8mb4');

Using procedural style it would look like this:

$mysqli = mysqli_connect($host, $user, $password, $dbName);
mysqli_set_charset($mysqli, 'utf8mb4');

Keep in mind that only the first 3 parameters are the same as in mysql_connect. The same code in the old API would be:

$link = mysql_connect($host, $user, $password);
mysql_select_db($dbName, $link);
mysql_query('SET NAMES utf8');

If your PHP code relied on implicit connection with default parameters defined in php.ini, you now have to open the MySQLi connection passing the parameters in your code, and then provide the connection link to all procedural functions or use the OOP style.

For more information see the article: How to connect properly using mysqli

2. Support for Prepared Statements

This is a big one. MySQL has added support for native prepared statements in MySQL 4.1 (2004). Prepared statements are the best way to prevent SQL injection. It was only logical that support for native prepared statements was added to PHP. Prepared statements should be used whenever data needs to be passed along with the SQL statement (i.e. WHERE, INSERT or UPDATE are the usual use cases).

The old MySQL API had a function to escape the strings used in SQL called mysql_real_escape_string, but it was never intended for protection against SQL injections and naturally shouldn't be used for the purpose.
The new MySQLi API offers a substitute function mysqli_real_escape_string for backwards compatibility, which suffers from the same problems as the old one and therefore should not be used unless prepared statements are not available.

The old mysql_* way:

$login = mysql_real_escape_string($_POST['login']);
$result = mysql_query("SELECT * FROM users WHERE user='$login'");

The prepared statement way:

$stmt = $mysqli->prepare('SELECT * FROM users WHERE user=?');
$stmt->bind_param('s', $_POST['login']);
$stmt->execute();
$result = $stmt->get_result();

Prepared statements in MySQLi can look a little off-putting to beginners. If you are starting a new project then deciding to use the more powerful and simpler PDO API might be a good idea.

3. Enhanced debugging capabilities

Some old-school PHP developers are used to checking for SQL errors manually and displaying them directly in the browser as means of debugging. However, such practice turned out to be not only cumbersome, but also a security risk. Thankfully MySQLi has improved error reporting capabilities.

MySQLi is able to report any errors it encounters as PHP exceptions. PHP exceptions will bubble up in the script and if unhandled will terminate it instantly, which means that no statement after the erroneous one will ever be executed. The exception will trigger PHP Fatal error and will behave as any error triggered from PHP core obeying the display_errors and log_errors settings. To enable MySQLi exceptions use the line mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT) and insert it right before you open the DB connection.

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new \mysqli($host, $user, $password, $dbName);
$mysqli->set_charset('utf8mb4');

If you were used to writing code such as:

$result = mysql_query('SELECT * WHERE 1=1');
if (!$result) {
    die('Invalid query: ' . mysql_error());
}

$result = mysql_query('SELECT * WHERE 1=1') or die(mysql_error());

you no longer need to die() in your code.

mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new \mysqli($host, $user, $password, $dbName);
$mysqli->set_charset('utf8mb4');

$result = $mysqli->query('SELECT * FROM non_existent_table');
// The following line will never be executed due to the mysqli_sql_exception being thrown above
foreach ($result as $row) {
    // ...
}

If for some reason you can't use exceptions, MySQLi has equivalent functions for error retrieval. You can use mysqli_connect_error() to check for connection errors and mysqli_error($mysqli) for any other errors. Pay attention to the mandatory argument in mysqli_error($mysqli) or alternatively stick to OOP style and use $mysqli->error.

$result = $mysqli->query('SELECT * FROM non_existent_table') or trigger_error($mysqli->error, E_USER_ERROR);

See these posts for more explanation:
mysqli or die, does it have to die?
How to get MySQLi error information in different environments?

4. Other changes

Unfortunately not every function from mysql_* has its counterpart in MySQLi only with an "i" added in the name and connection link as first parameter. Here is a list of some of them:

mysql_client_encoding() has been replaced by mysqli_character_set_name($mysqli)
mysql_create_db has no counterpart. Use prepared statements or mysqli_query instead
mysql_drop_db has no counterpart. Use prepared statements or mysqli_query instead
mysql_db_name & mysql_list_dbs support has been dropped in favour of SQL's SHOW DATABASES
mysql_list_tables support has been dropped in favour of SQL's SHOW TABLES FROM dbname
mysql_list_fields support has been dropped in favour of SQL's SHOW COLUMNS FROM sometable
mysql_db_query -> use mysqli_select_db() then the query or specify the DB name in the query
mysql_fetch_field($result, 5) -> the second parameter (offset) is not present in mysqli_fetch_field. You can use mysqli_fetch_field_direct keeping in mind the different results returned
mysql_field_flags, mysql_field_len, mysql_field_name, mysql_field_table & mysql_field_type -> has been replaced with mysqli_fetch_field_direct
mysql_list_processes has been removed. If you need thread ID use mysqli_thread_id
mysql_pconnect has been replaced with mysqli_connect() with p: host prefix
mysql_result -> use mysqli_data_seek() in conjunction with mysqli_field_seek() and mysqli_fetch_field()
mysql_tablename support has been dropped in favour of SQL's SHOW TABLES
mysql_unbuffered_query has been removed. See this article for more information Buffered and Unbuffered queries

Simple dictionary in C++

You can use the following syntax:

#include <map>

std::map<char, char> my_map = {
    { 'A', '1' },
    { 'B', '2' },
    { 'C', '3' }
};

Get LatLng from Zip Code - Google Maps API

Here is the most reliable way to get the lat/long from zip code (i.e. postal code):

https://maps.googleapis.com/maps/api/geocode/json?key=YOUR_API_KEY&components=postal_code:97403

Make Https call using HttpClient

When connect to https I got this error too, I add this line before HttpClient httpClient = new HttpClient(); and connect successfully:

ServicePointManager.ServerCertificateValidationCallback = delegate { return true; };

I know it from This Answer and Another Similar Anwser and the comment mentions:

This is a hack useful in development so putting a #if DEBUG #endif statement around it is the least you should do to make this safer and stop this ending up in production

Besides, I didn't try the method in Another Answer that use new X509Certificate() or new X509Certificate2() to make a Certificate, I'm not sure simply create by new() will work or not.

EDIT: Some References:

Create a Self-Signed Server Certificate in IIS 7

Import and Export SSL Certificates in IIS 7

Convert .pfx to .cer

Best practices for using ServerCertificateValidationCallback

I find value of Thumbprint is equal to x509certificate.GetCertHashString():

Retrieve the Thumbprint of a Certificate

Click events on Pie Charts in Chart.js

I was facing the same issues since several days, Today i have found the solution. I have shown the complete file which is ready to execute.

<html>
<head><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.7.2/Chart.js">
</script>
</head>
<body>
<canvas id="myChart" width="200" height="200"></canvas>
<script>
var ctx = document.getElementById("myChart").getContext('2d');
var myChart = new Chart(ctx, {
type: 'bar',
data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
        label: '# of Votes',
        data: [12, 19, 3, 5, 2, 3],
        backgroundColor: [
            'rgba(255, 99, 132, 0.2)',
            'rgba(54, 162, 235, 0.2)',
            'rgba(255, 206, 86, 0.2)',
            'rgba(75, 192, 192, 0.2)',
            'rgba(153, 102, 255, 0.2)',
            'rgba(255, 159, 64, 0.2)'
        ],
        borderColor: [
            'rgba(255,99,132,1)',
            'rgba(54, 162, 235, 1)',
            'rgba(255, 206, 86, 1)',
            'rgba(75, 192, 192, 1)',
            'rgba(153, 102, 255, 1)',
            'rgba(255, 159, 64, 1)'
        ],
        borderWidth: 1
    }]
},
options: {
    scales: {
        yAxes: [{
            ticks: {
                beginAtZero:true
            }
        }]
    },
onClick:function(e){
    var activePoints = myChart.getElementsAtEvent(e);
    var selectedIndex = activePoints[0]._index;
    alert(this.data.datasets[0].data[selectedIndex]);


}
}
});
</script>
</body>
</html>

How can I get my Twitter Bootstrap buttons to right align?

In twitter bootstrap 3 try the class pull-right

class="btn pull-right"

Select2 doesn't work when embedded in a bootstrap modal

.select2-close-mask{
    z-index: 2099;
}
.select2-dropdown{
    z-index: 3051;
}

This is my solution with select2 4.0.0. Just override the css right below the select2.css import. Please make sure the z-index is greater than your dialog or modal. I just add 2000 on the default ones. Cause my dialogs' z-index are about 1000.

Java 8 Streams FlatMap method example

A very simple example: Split a list of full names to get a list of names, regardless of first or last

 List<String> fullNames = Arrays.asList("Barry Allen", "Bruce Wayne", "Clark Kent");

 fullNames.stream()
            .flatMap(fullName -> Pattern.compile(" ").splitAsStream(fullName))
            .forEach(System.out::println);

This prints out:

Barry
Allen
Bruce
Wayne
Clark
Kent

Focus Next Element In Tab Index

There is the tabindex property that can be set on component. It specifies in which order the input components should be iterated when selecting one and pressing tab. Values above 0 are reserved for custom navigation, 0 is "in natural order" (so would behave differently if set for the first element), -1 means not keyboard focusable:

<!-- navigate with tab key: -->
<input tabindex="1" type="text"/>
<input tabindex="2" type="text"/>

It can also be set for something else than the text input fields but it is not very obvious what it would do there, if anything at all. Even if the navigation works, maybe better to use "natural order" for anything else than the very obvious user input elements.

No, you do not need JQuery or any scripting at all to support this custom path of navigation. You can implement it on the server side without any JavaScript support. From the other side, the property also works fine in React framework but does not require it.

Disable Proximity Sensor during call

Unfortunately my proximity sensor doesn't work, too (always returns 0.0 cm). I found the way, but not easy one: you need to root your phone, install XPOSED framework and Sensor Disabler (https://play.google.com/store/apps/details?id=com.mrchandler.disableprox). You can mock proximity sensor return value in the app. (e.g. always return 2.0 cm). Then your display will be always on during the call.

What are some ways of accessing Microsoft SQL Server from Linux?

If you use eclipse you can install Data Tools Platform plugin on it and use it for every DB engines including MS SQLServer. It just needs to get JDBC driver for that DB engine.

Regex: ignore case sensitivity

Just for the sake of completeness I wanted to add the solution for regular expressions in C++ with Unicode:

std::tr1::wregex pattern(szPattern, std::tr1::regex_constants::icase);

if (std::tr1::regex_match(szString, pattern))
{
...
}

PHP create key => value pairs within a foreach

function createOfferUrlArray($Offer) {
    $offerArray = array();
    foreach ($Offer as $key => $value) { 
        $offerArray[$key] = $value[4];
    }
    return $offerArray;
}

function createOfferUrlArray($offer) {
    foreach ( $offer as &$value ) {
        $value = $value[4];
    }
    unset($value);
    return $offer;
}

Using FFmpeg in .net?

The original question is now more than 5 years old. In the meantime there is now a solution for a WinRT solution from ffmpeg and an integration sample from Microsoft.

how to make twitter bootstrap submenu to open on the left side?

Are you using the latest version of bootstrap? I have adapted the html from the Fluid Layout example as shown below. I added a drop down and placed it furthest to the right hand side by adding the pull-right class. When hovering over the drop down menu it is automatically pulled to the left and nothing is hidden - all the menu text is visible. I have not used any custom css.

<div class="navbar navbar-inverse navbar-fixed-top">
  <div class="navbar-inner">
    <div class="container-fluid">
      <a class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </a>
      <a class="brand" href="#">Project name</a>
      <div class="nav-collapse collapse">
        <ul class="nav pull-right">
          <li class="active"><a href="#">Home</a></li>
          <li><a href="#about">About</a></li>
          <li><a href="#contact">Contact</a></li>
          <li class="dropdown open">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
            <ul class="dropdown-menu">
              <li><a href="#">Action</a></li>
              <li><a href="#">Another action</a></li>
              <li><a href="#">Something else here</a></li>
              <li class="divider"></li>
              <li class="nav-header">Nav header</li>
              <li><a href="#">Separated link</a></li>
              <li><a href="#">One more separated link</a></li>
            </ul>
          </li>
        </ul>
        <p class="navbar-text pull-right">
          Logged in as <a href="#" class="navbar-link">Username</a>
        </p>
      </div><!--/.nav-collapse -->
    </div>
  </div>
</div>

How to list files inside a folder with SQL Server

You can use xp_dirtree

It takes three parameters:

Path of a Root Directory, Depth up to which you want to get files and folders and the last one is for showing folders only or both folders and files.

EXAMPLE: EXEC xp_dirtree 'C:\', 2, 1

Usage of unicode() and encode() functions in Python

Make sure you've set your locale settings right before running the script from the shell, e.g.

$ locale -a | grep "^en_.\+UTF-8"
en_GB.UTF-8
en_US.UTF-8
$ export LC_ALL=en_GB.UTF-8
$ export LANG=en_GB.UTF-8

Docs: man locale, man setlocale.

Where does PHP store the error log? (php5, apache, fastcgi, cpanel)

You are on share environment and cannot find error log, always check if cPanel has option Errors on your cPanel dashboard. If you are not being able to find error log, then you can find it there .

On cPanel search bar, search Error, it will show Error Pages which are basically lists of different http error pages and other Error is where the error logs are displayed.

Other places to look on shared environment: /home/yourusername/logs /home/yourusername/public_html/error_log

Drop multiple columns in pandas

You don't need to wrap it in a list with [..], just provide the subselection of the columns index:

df.drop(df.columns[[1, 69]], axis=1, inplace=True)

as the index object is already regarded as list-like.

Is there a sleep function in JavaScript?

A naive, CPU-intensive method to block execution for a number of milliseconds:

/**
* Delay for a number of milliseconds
*/
function sleep(delay) {
    var start = new Date().getTime();
    while (new Date().getTime() < start + delay);
}

In Typescript, How to check if a string is Numeric

if var sum=0; var x;

then, what about this? sum+=(x|0);

Download files from SFTP with SSH.NET library

A simple working code to download a file with SSH.NET library is:

using (Stream fileStream = File.Create(@"C:\target\local\path\file.zip"))
{
    sftp.DownloadFile("/source/remote/path/file.zip", fileStream);
}

To explain, why your code does not work:

The second parameter of SftpClient.DownloadFile is a stream to write a downloaded contents to.

You are passing in a read stream instead of a write stream. And moreover the path you are opening read stream with is a remote path, what cannot work with File class operating on local files only.

Just discard the File.OpenRead line and use a result of previous File.OpenWrite call instead (that you are not using at all now):

Stream file1 = File.OpenWrite(localFileName);

sftp.DownloadFile(file.FullName, file1);

Or even better, use File.Create to discard any previous contents that the local file may have.

I'm not sure if your localFileName is supposed to hold full path, or just file name. So you may need to add a path too, if necessary (combine localFileName with sDir?)

How do I add more members to my ENUM-type column in MySQL?

In MYSQL server version: 5.0.27 i tried this and it worked fine for me check in your version

ALTER TABLE carmake
     MODIFY `country` ENUM('Japan', 'USA', 'England', 'Australia', 'Germany', 'France', 'Italy', 'Spain', 'Czech Republic', 'China', 'South Korea', 'India', 'Sweden', 'Malaysia');

How to track untracked content?

I had the same problem with a big project with many submodules. Based on the answers of Chris Johnsen here and VonC here I build a short bash script which iterates through all existing gitlink entries and adds them as proper submodules.

#!/bin/bash

# Read all submodules in current git
MODULES=`git ls-files --stage | grep 160000`

# Iterate through every submodule path
while read -r MOD; do
  # extract submodule path (split line at whitespace and take string with index 3)
  ARRIN=(${MOD})
  MODPATH=${ARRIN[3]}

  # grep module url from .git file in submodule path
  MODURL=`grep "url = " $MODPATH/.git/config`
  MODURL=${MODURL##*=}

  # echo path and url for information
  echo $MODPATH
  echo $MODURL

  # remove existing entry in submodule index
  git rm --cached $MODPATH
  # add new entry in submodule index
  git submodule add $MODURL $MODPATH
done <<< "$MODULES"

This fixed it for me, I hope it is of any help.

Best way to store a key=>value array in JavaScript?

Objects inside an array:

var cars = [
        { "id": 1, brand: "Ferrari" }
        , { "id": 2, brand: "Lotus" }
        , { "id": 3, brand: "Lamborghini" }
    ];

Vue - Deep watching an array of objects and calculating the change?

Your comparison function between old value and new value is having some issue. It is better not to complicate things so much, as it will increase your debugging effort later. You should keep it simple.

The best way is to create a person-component and watch every person separately inside its own component, as shown below:

<person-component :person="person" v-for="person in people"></person-component>

Please find below a working example for watching inside person component. If you want to handle it on parent side, you may use $emit to send an event upwards, containing the id of modified person.

_x000D_

Vue.component('person-component', {_x000D_
    props: ["person"],_x000D_
    template: `_x000D_
        <div class="person">_x000D_
            {{person.name}}_x000D_
            <input type='text' v-model='person.age'/>_x000D_
        </div>`,_x000D_
    watch: {_x000D_
        person: {_x000D_
            handler: function(newValue) {_x000D_
                console.log("Person with ID:" + newValue.id + " modified")_x000D_
                console.log("New age: " + newValue.age)_x000D_
            },_x000D_
            deep: true_x000D_
        }_x000D_
    }_x000D_
});_x000D_
_x000D_
new Vue({_x000D_
    el: '#app',_x000D_
    data: {_x000D_
        people: [_x000D_
          {id: 0, name: 'Bob', age: 27},_x000D_
          {id: 1, name: 'Frank', age: 32},_x000D_
          {id: 2, name: 'Joe', age: 38}_x000D_
        ]_x000D_
    }_x000D_
});

_x000D_

<script src="https://unpkg.com/[email protected]/dist/vue.js"></script>_x000D_
<body>_x000D_
    <div id="app">_x000D_
        <p>List of people:</p>_x000D_
        <person-component :person="person" v-for="person in people"></person-component>_x000D_
    </div>_x000D_
</body>

_x000D_

Basic communication between two fragments

Update

Ignore this answer. Not that it doesn't work. But there are better methods available. Moreover, Android emphatically discourage direct communication between fragments. See official doc. Thanks user @Wahib Ul Haq for the tip.

Original Answer

Well, you can create a private variable and setter in Fragment B, and set the value from Fragment A itself,

FragmentB.java

private String inputString;
....
....

public void setInputString(String string){
   inputString = string;
}

FragmentA.java

//go to fragment B

FragmentB frag  = new FragmentB();
frag.setInputString(YOUR_STRING);
//create your fragment transaction object, set animation etc
fragTrans.replace(ITS_ARGUMENTS)

Or you can use Activity as you suggested in question..

How do I install a Python package with a .whl file?

You can install the .whl file, using pip install filename. Though to use it in this form, it should be in the same directory as your command line, otherwise specify the complete filename, along with its address like pip install C:\Some\PAth\filename.

Also make sure the .whl file is of the same platform as you are using, do a python -V to find out which version of Python you are running and if it is win32 or 64, install the correct version according to it.

How to avoid the need to specify the WSDL location in a CXF or JAX-WS generated webservice client?

1) In some cases, yes. If the WSDL contains things like Policies and such that direct the runtime behavior, then the WSDL may be required at runtime. Artifacts are not generated for policy related things and such. Also, in some obscure RPC/Literal cases, not all the namespaces that are needed are output in the generated code (per spec). Thus, the wsdl would be needed for them. Obscure cases though.

2) I thought something like would work. What version of CXF? That sounds like a bug. You can try an empty string in there (just spaces). Not sure if that works or not. That said, in your code, you can use the constructor that takes the WSDL URL and just pass null. The wsdl wouldn't be used.

3) Just the limitations above.

how to drop database in sqlite?

The concept of creating or dropping a database is not meaningful for an embedded database engine like SQLite. It only has meaning with a client-sever database system, such as used by MySQL or Postgres.

To create a new database, just do sqlite_open() or from the command line sqlite3 databasefilename.

To drop a database, delete the file.

Reference: sqlite - Unsupported SQL

Error running android: Gradle project sync failed. Please fix your project and try again

this worked for me:

Step 1: visit Release Notes page of Gradle plugin : https://developer.android.com/studio/releases/gradle-plugin

Step 2: go to File > Project Structure > Project and make sure that your Gradle plugin version is compatible with Gradle by referring to table in link above

How to order by with union in SQL?

Just write

Select id,name,age
From Student
Where age < 15
Union
Select id,name,age
From Student
Where Name like "%a%"
Order by name

the order by is applied to the complete resultset

Use curly braces to initialize a Set in Python

Compare also the difference between {} and set() with a single word argument.

>>> a = set('aardvark')
>>> a
{'d', 'v', 'a', 'r', 'k'} 
>>> b = {'aardvark'}
>>> b
{'aardvark'}

but both a and b are sets of course.

What is the purpose of the "final" keyword in C++11 for functions?

It is to prevent a class from being inherited. From Wikipedia:
C++11 also adds the ability to prevent inheriting from classes or simply preventing overriding methods in derived classes. This is done with the special identifier final. For example:
```
struct Base1 final { };

struct Derived1 : Base1 { }; // ill-formed because the class Base1 
                             // has been marked final
```

It is also used to mark a virtual function so as to prevent it from being overridden in the derived classes:

struct Base2 {
    virtual void f() final;
};

struct Derived2 : Base2 {
    void f(); // ill-formed because the virtual function Base2::f has 
              // been marked final
};

Wikipedia further makes an interesting point:

Note that neither override nor final are language keywords. They are technically identifiers; they only gain special meaning when used in those specific contexts. In any other location, they can be valid identifiers.

That means, the following is allowed:

int const final = 0;     // ok
int const override = 1;  // ok

How to search a string in another string?

Display all items in array using jquery

here is solution, i create a text field to dynamic add new items in array my html code is

_x000D_

 <input type="text" id="name">_x000D_
  <input type="button" id="btn" value="Button">_x000D_
  <div id="names">_x000D_
  </div>

_x000D_

now type any thing in text field and click on button this will add item onto array and call function dispaly_arry

_x000D_

$(document).ready(function()_x000D_
{  _x000D_
 function display_array()_x000D_
 {_x000D_
  $("#names").text('');_x000D_
  $.each(names,function(index,value)_x000D_
  {_x000D_
    $('#names').append(value + '<br/>');_x000D_
  });_x000D_
 }_x000D_
 _x000D_
 var names = ['Alex','Billi','Dale'];_x000D_
 display_array();_x000D_
 $('#btn').click(function()_x000D_
 {_x000D_
  var name = $('#name').val();_x000D_
  names.push(name);// appending value to arry _x000D_
  display_array();_x000D_
  _x000D_
 });_x000D_
 _x000D_
});_x000D_

_x000D_

showing array elements into div , you can use span but for this solution use same id .!

Why are empty catch blocks a bad idea?

I think it's okay if you catch a particular exception type of which you know it's only going to be raised for one particular reason, and you expect that exception and really don't need to do anything about it.

But even in that case, a debug message might be in order.

Validating IPv4 addresses with regexp

I tried to make it a bit simpler and shorter.

^(([01]?\d{1,2}|2[0-4]\d|25[0-5])\.){3}([01]?\d{1,2}|2[0-4]\d|25[0-5])$

If you are looking for java/kotlin:

^(([01]?\\d{1,2}|2[0-4]\\d|25[0-5])\\.){3}([01]?\\d{1,2}|2[0-4]\\d|25[0-5])$

If someone wants to know how it works here is the explanation. It's really so simple. Just give it a try :p :

 1. ^.....$: '^' is the starting and '$' is the ending.

 2. (): These are called a group. You can think of like "if" condition groups.

 3. |: 'Or' condition - as same as most of the programming languages.

 4. [01]?\d{1,2}: '[01]' indicates one of the number between 0 and 1. '?' means '[01]' is optional. '\d' is for any digit between 0-9 and '{1,2}' indicates the length can be between 1 and 2. So here the number can be 0-199.

 5. 2[0-4]\d: '2' is just plain 2. '[0-4]' means a number between 0 to 4. '\d' is for any digit between 0-9. So here the number can be 200-249.

 6. 25[0-5]: '25' is just plain 25. '[0-5]' means a number between 0 to 5. So here the number can be 250-255.

 7. \.: It's just plan '.'(dot) for separating the numbers.

 8. {3}: It means the exact 3 repetition of the previous group inside '()'.

 9. ([01]?\d{1,2}|2[0-4]\d|25[0-5]): Totally same as point 2-6

Mathematically it is like:

(0-199 OR 200-249 OR 250-255).{Repeat exactly 3 times}(0-199 OR 200-249 OR 250-255)

So, as you can see normally this is the pattern for the IP addresses. I hope it helps to understand Regular Expression a bit. :p

How can I list the scheduled jobs running in my database?

I think you need the SCHEDULER_ADMIN role to see the dba_scheduler tables (however this may grant you too may rights)

see: http://download.oracle.com/docs/cd/B28359_01/server.111/b28310/schedadmin001.htm

Export table from database to csv file

Some ideas:

From SQL Server Management Studio

 1. Run a SELECT statement to filter your data
 2. Click on the top-left corner to select all rows
 3. Right-click to copy all the selected
 4. Paste the copied content on Microsoft Excel
 5. Save as CSV

Using SQLCMD (Command Prompt)

Example:

From the command prompt, you can run the query and export it to a file:

sqlcmd -S . -d DatabaseName -E -s, -W -Q "SELECT * FROM TableName" > C:\Test.csv

Do not quote separator use just -s, and not quotes -s',' unless you want to set quote as separator.

More information here: ExcelSQLServer

Notes:

This approach will have the "Rows affected" information in the bottom of the file, but you can get rid of this by using the "SET NOCOUNT ON" in the query itself.
You may run a stored procedure instead of the actual query (e.g. "EXEC Database.dbo.StoredProcedure")
You can use any programming language or even a batch file to automate this

Using BCP (Command Prompt)

Example:

bcp "SELECT * FROM Database.dbo.Table" queryout C:\Test.csv -c -t',' -T -S .\SQLEXPRESS

It is important to quote the comma separator as -t',' vs just -t,

More information here: bcp Utility

Notes:

As per when using SQLCMD, you can run stored procedures instead of the actual queries
You can use any programming language or a batch file to automate this

Hope this helps.

How to change the window title of a MATLAB plotting figure?

You need to set figure properties.

At the very beginning of the script, call

figure('name','something else')

Calling figure is a good thing, anyway, because without it, you always plot into the same window, and sometimes you may want to compare two windows side-by-side.

Alternatively, you can store the figure's handle by calling

figH = figure;

so that you can later change the figure properties to your liking (the 'numberTitle' property setting eliminates the "figure X" text)

set(figH,'Name','something else','NumberTitle','off')

Have a look at the figure properties in the MATLAB documentation to see what else you can change if you want.

How to get Enum Value from index in Java?

Try this

Months.values()[index]

How to get the last day of the month?

To get the last date of the month we do something like this:

from datetime import date, timedelta
import calendar
last_day = date.today().replace(day=calendar.monthrange(date.today().year, date.today().month)[1])

Now to explain what we are doing here we will break it into two parts:

first is getting the number of days of the current month for which we use monthrange which Blair Conrad has already mentioned his solution:

calendar.monthrange(date.today().year, date.today().month)[1]

second is getting the last date itself which we do with the help of replace e.g

>>> date.today()
datetime.date(2017, 1, 3)
>>> date.today().replace(day=31)
datetime.date(2017, 1, 31)

and when we combine them as mentioned on the top we get a dynamic solution.

How to add an element to Array and shift indexes?

org.apache.commons.lang3.ArrayUtils#add(T[], int, T) is deprecated in newest commons lang3, you can use org.apache.commons.lang3.ArrayUtils#insert(int, T[], T...) instead.

Deprecated this method has been superseded by insert(int, T[], T...) and may be removed in a future release. Please note the handling of null input arrays differs in the new method: inserting X into a null array results in null not X

Sample code:

    Assert.assertArrayEquals
            (org.apache.commons.lang3.ArrayUtils.insert
            (4, new int[]{1, 2, 3, 4, 5, 6}, 87), new int[]{1, 2, 3, 4, 87, 5, 6});

WPF TemplateBinding vs RelativeSource TemplatedParent

TemplateBinding - More limiting than using regular Binding

More efficient than a Binding but it has less functionality
Only works inside a ControlTemplate's visual tree
Doesn't work with properties on Freezables
Doesn't work within a ControlTemplate's Trigger
Provides a shortcut in setting properties(not as verbose),e.g. {TemplateBinding targetProperty}

Regular Binding - Does not have above limitations of TemplateBinding

Respects Parent Properties
Resets Target Values to clear out any explicitly set values
Example: <Ellipse Fill="{Binding RelativeSource={RelativeSource TemplatedParent},Path=Background}"/>

Enable VT-x in your BIOS security settings (refer to documentation for your computer)

Intel HAXM is required to run this AVD. VT-x is disabled in BIOS.

Enable VT-x in your BIOS security settings (refer to documentation for your computer).this error on android studio I dont no how to do Bios Security

JavaScript Nested function

It is called closure.

Basically, the function defined within other function is accessible only within this function. But may be passed as a result and then this result may be called.

It is a very powerful feature. You can see more explanation here:

javascript_closures_for_dummies.html mirror on Archive.org

How to print register values in GDB?

Gdb commands:

i r <register_name>: print a single register, e.g i r rax, i r eax
i r <register_name_1> <register_name_2> ...: print multiple registers, e.g i r rdi rsi,
i r: print all register except floating point & vector register (xmm, ymm, zmm).
i r a: print all register, include floating point & vector register (xmm, ymm, zmm).
i r f: print all FPU floating registers (st0-7 and a few other f*)

Other register groups besides a (all) and f (float) can be found with:

maint print reggroups

as documented at: https://sourceware.org/gdb/current/onlinedocs/gdb/Registers.html#Registers

Tips:

xmm0 ~ xmm15, are 128 bits, almost every modern machine has it, they are released in 1999.
ymm0 ~ ymm15, are 256 bits, new machine usually have it, they are released in 2011.
zmm0 ~ zmm31, are 512 bits, normal pc probably don't have it (as the year 2016), they are released in 2013, and mainly used in servers so far.
Only one serial of xmm / ymm / zmm will be shown, because they are the same registers in different mode. On my machine ymm is shown.

Writing to a new file if it doesn't exist, and appending to a file if it does

Using the `pathlib` module (python's object-oriented filesystem paths)

Just for kicks, this is perhaps the latest pythonic version of the solution.

from pathlib import Path 

path = Path(f'{player}.txt')
path.touch()  # default exists_ok=True
with path.open('a') as highscore:
   highscore.write(f'Username:{player}')

How to push to History in React Router v4?

If you want to use history while passing a function as a value to a Component's prop, with react-router 4 you can simply destructure the history prop in the render attribute of the <Route/> Component and then use history.push()

    <Route path='/create' render={({history}) => (
      <YourComponent
        YourProp={() => {
          this.YourClassMethod()
          history.push('/')
        }}>
      </YourComponent>
    )} />

Note: For this to work you should wrap React Router's BrowserRouter Component around your root component (eg. which might be in index.js)

How do I make an asynchronous GET request in PHP?

Here's an adaptation of the accepted answer for performing a simple GET request.

One thing to note if the server does any url rewriting, this will not work. You'll need to use a more full featured http client.

  /**
   * Performs an async get request (doesn't wait for response)
   * Note: One limitation of this approach is it will not work if server does any URL rewriting
   */
  function async_get($url)
  {
      $parts=parse_url($url);

      $fp = fsockopen($parts['host'],
          isset($parts['port'])?$parts['port']:80,
          $errno, $errstr, 30);

      $out = "GET ".$parts['path']." HTTP/1.1\r\n";
      $out.= "Host: ".$parts['host']."\r\n";
      $out.= "Connection: Close\r\n\r\n";
      fwrite($fp, $out);
      fclose($fp);
  }

Loop through all the files with a specific extension

No fancy tricks needed:

for i in *.java; do
    [ -f "$i" ] || break
    ...
done

The guard ensures that if there are no matching files, the loop will exit without trying to process a non-existent file name *.java. In bash (or shells supporting something similar), you can use the nullglob option to simply ignore a failed match and not enter the body of the loop.

shopt -s nullglob
for i in *.java; do
    ...
done

How to flush output of print function?

Running python -h, I see a command line option:

-u : unbuffered binary stdout and stderr; also PYTHONUNBUFFERED=x see man page for details on internal buffering relating to '-u'

Here is the relevant doc.

UnicodeEncodeError: 'charmap' codec can't encode characters

I fixed it by adding .encode("utf-8") to soup.

That means that print(soup) becomes print(soup.encode("utf-8")).

How do you get the list of targets in a makefile?

not sure why the previous answer was so complicated:

list:
    cat Makefile | grep "^[A-z]" | awk '{print $$1}' | sed "s/://g"

How can I hash a password in Java?

Here you have two links for MD5 hashing and other hash methods:

Javadoc API: https://docs.oracle.com/javase/1.5.0/docs/api/java/security/MessageDigest.html

Tutorial: http://www.twmacinta.com/myjava/fast_md5.php

How to validate numeric values which may contain dots or commas?

\d means a digit in most languages. You can also use [0-9] in all languages. For the "period or comma" use [\.,]. Depending on your language you may need more backslashes based on how you quote the expression. Ultimately, the regular expression engine needs to see a single backslash.

* means "zero-or-more", so \d* and [0-9]* mean "zero or more numbers". ? means "zero-or-one". Neither of those qualifiers means exactly one. Most languages also let you use {m,n} to mean "between m and n" (ie: {1,2} means "between 1 and 2")

Since the dot or comma and additional numbers are optional, you can put them in a group and use the ? quantifier to mean "zero-or-one" of that group.

Putting that all together you can use:

\d{1,2}([\.,][\d{1,2}])?

Meaning, one or two digits \d{1,2}, followed by zero-or-one of a group (...)? consisting of a dot or comma followed by one or two digits [\.,]\d{1,2}

Best way to check if a Data Table has a null value in it

foreach(DataRow row in dataTable.Rows)
{
    if(row.IsNull("myColumn"))
        throw new Exception("Empty value!")
}

Add image to left of text via css

.create
{
background-image: url('somewhere.jpg');
background-repeat: no-repeat;
padding-left: 30px;  /* width of the image plus a little extra padding */
display: block;  /* may not need this, but I've found I do */
}

Play around with padding and possibly margin until you get your desired result. You can also play with the position of the background image (*nod to Tom Wright) with "background-position" or doing a completely definition of "background" (link to w3).

Plotting two variables as lines using ggplot2 on the same graph

For a small number of variables, you can build the plot manually yourself:

ggplot(test_data, aes(date)) + 
  geom_line(aes(y = var0, colour = "var0")) + 
  geom_line(aes(y = var1, colour = "var1"))

Difference between spring @Controller and @RestController annotation

As you can see in Spring documentation (Spring RestController Documentation) Rest Controller annotation is the same as Controller annotation, but assuming that @ResponseBody is active by default, so all the Java objects are serialized to JSON representation in the response body.

Is there a difference between `continue` and `pass` in a for loop in python?

continue will jump back to the top of the loop. pass will continue processing.

if pass is at the end for the loop, the difference is negligible as the flow would just back to the top of the loop anyway.

In HTML5, should the main navigation be inside or outside the <header> element?

It's a little unclear whether you're asking for opinions, eg. "it's common to do xxx" or an actual rule, so I'm going to lean in the direction of rules.

The examples you cite seem based upon the examples in the spec for the nav element. Remember that the spec keeps getting tweaked and the rules are sometimes convoluted, so I'd venture many people might tend to just do what's given rather than interpret. You're showing two separate examples with different behavior, so there's only so much you can read into it. Do either of those sites also have the opposing sub/nav situation, and if so how do they handle it?

Most importantly, though, there's nothing in the spec saying either is the way to do it. One of the goals with HTML5 was to be very clear[this for comparison] about semantics, requirements, etc. so the omission is worth noting. As far as I can see, the examples are independent of each other and equally valid within their own context of layout requirements, etc.

Having the nav's source position be conditional is kind of silly(another red flag). Just pick a method and go with it.

How to reload .bash_profile from the command line?

if the .bash_profile does not exist you can try run the following command:

. ~/.bashrc

 source ~/.bashrc

instead of .bash_profile. You can find more information about bashrc

Error occurred during initialization of boot layer FindException: Module not found

I solved this issue by going into Properties -> Java Build Path and reordering my source folder so it was above the JRE System Library.

How to convert NSData to byte array in iPhone?

Already answered, but to generalize to help other readers:

    //Here:   NSData * fileData;
    uint8_t * bytePtr = (uint8_t  * )[fileData bytes];

    // Here, For getting individual bytes from fileData, uint8_t is used.
    // You may choose any other data type per your need, eg. uint16, int32, char, uchar, ... .
    // Make sure, fileData has atleast number of bytes that a single byte chunk would need. eg. for int32, fileData length must be > 4 bytes. Makes sense ?

    // Now, if you want to access whole data (fileData) as an array of uint8_t
    NSInteger totalData = [fileData length] / sizeof(uint8_t);

    for (int i = 0 ; i < totalData; i ++)
    {
        NSLog(@"data byte chunk : %x", bytePtr[i]);
    }

How to parse a text file with C#

Another solution, this time making use of regular expressions:

using System.Text.RegularExpressions;

...

Regex parts = new Regex(@"^\d+\t(\d+)\t.+?\t(item\\[^\t]+\.ddj)");

StreamReader reader = FileInfo.OpenText("filename.txt");
string line;
while ((line = reader.ReadLine()) != null) {
    Match match = parts.Match(line);
    if (match.Success) {
        int number = int.Parse(match.Group(1).Value);
        string path = match.Group(2).Value;

        // At this point, `number` and `path` contain the values we want
        // for the current line. We can then store those values or print them,
        // or anything else we like.
    }
}

That expression's a little complex, so here it is broken down:

^        Start of string
\d+      "\d" means "digit" - 0-9. The "+" means "one or more."
         So this means "one or more digits."
\t       This matches a tab.
(\d+)    This also matches one or more digits. This time, though, we capture it
         using brackets. This means we can access it using the Group method.
\t       Another tab.
.+?      "." means "anything." So "one or more of anything". In addition, it's lazy.
         This is to stop it grabbing everything in sight - it'll only grab as much
         as it needs to for the regex to work.
\t       Another tab.

(item\\[^\t]+\.ddj)
    Here's the meat. This matches: "item\<one or more of anything but a tab>.ddj"

How to generate random float number in C

You can also generate in a range [min, max] with something like

float float_rand( float min, float max )
{
    float scale = rand() / (float) RAND_MAX; /* [0, 1.0] */
    return min + scale * ( max - min );      /* [min, max] */
}

Internal Error 500 Apache, but nothing in the logs?

Check your php error log which might be a separate file from your apache error log.

Find it by going to phpinfo() and check for error_log attribute. If it is not set. Set it: https://stackoverflow.com/a/12835262/445131

Maybe your post_max_size is too small for what you're trying to post, or one of the other max memory settings is too low.

Typescript: TS7006: Parameter 'xxx' implicitly has an 'any' type

go to tsconfig.json and comment the line the //strict:true this worked for me

How to show one layout on top of the other programmatically in my case?

Use a FrameLayout with two children. The two children will be overlapped. This is recommended in one of the tutorials from Android actually, it's not a hack...

Here is an example where a TextView is displayed on top of an ImageView:

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

  <ImageView  
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 

    android:scaleType="center"
    android:src="@drawable/golden_gate" />

  <TextView
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginBottom="20dip"
    android:layout_gravity="center_horizontal|bottom"

    android:padding="12dip"

    android:background="#AA000000"
    android:textColor="#ffffffff"

    android:text="Golden Gate" />

</FrameLayout>

Here is the result

Android Studio update -Error:Could not run build action using Gradle distribution

You can download the gradle you want from Gradle Service by reading the gradle-wrapper.properties.Download it ,unpack it where you like and then change your grandle configuration use local not the recommended.

How can I hide an HTML table row <tr> so that it takes up no space?

I would really like to see your TABLE's styling. E.g. "border-collapse"

Just a guess, but it might affect how 'hidden' rows are being rendered.

Why javascript getTime() is not a function?

That's because your dat1 and dat2 variables are just strings.

You should parse them to get a Date object, for that format I always use the following function:

// parse a date in yyyy-mm-dd format
function parseDate(input) {
  var parts = input.match(/(\d+)/g);
  // new Date(year, month [, date [, hours[, minutes[, seconds[, ms]]]]])
  return new Date(parts[0], parts[1]-1, parts[2]); // months are 0-based
}

I use this function because the Date.parse(string) (or new Date(string)) method is implementation dependent, and the yyyy-MM-dd format will work on modern browser but not on IE, so I prefer doing it manually.

how to convert binary string to decimal?

Slightly modified conventional binary conversion algorithm utilizing some more ES6 syntax and auto-features:

Convert binary sequence string to Array (assuming it wasnt already passed as array)
Reverse sequence to force 0 index to start at right-most binary digit as binary is calculated right-left
'reduce' Array function traverses array, performing summation of (2^index) per binary digit [only if binary digit === 1] (0 digit always yields 0)

NOTE: Binary conversion formula:

{where d=binary digit, i=array index, n=array length-1 (starting from right)}

n
? (d * 2^i)
i=0

let decimal = Array.from(binaryString).reverse().reduce((total, val, index)=>val==="1"?total + 2**index:total, 0);  

console.log(`Converted BINARY sequence (${binaryString}) to DECIMAL (${decimal}).`);

How to compute precision, recall, accuracy and f1-score for the multiclass case with scikit learn?

I think there is a lot of confusion about which weights are used for what. I am not sure I know precisely what bothers you so I am going to cover different topics, bear with me ;).

Class weights

The weights from the class_weight parameter are used to train the classifier. They are not used in the calculation of any of the metrics you are using: with different class weights, the numbers will be different simply because the classifier is different.

Basically in every scikit-learn classifier, the class weights are used to tell your model how important a class is. That means that during the training, the classifier will make extra efforts to classify properly the classes with high weights.
How they do that is algorithm-specific. If you want details about how it works for SVC and the doc does not make sense to you, feel free to mention it.

The metrics

Once you have a classifier, you want to know how well it is performing. Here you can use the metrics you mentioned: accuracy, recall_score, f1_score...

Usually when the class distribution is unbalanced, accuracy is considered a poor choice as it gives high scores to models which just predict the most frequent class.

I will not detail all these metrics but note that, with the exception of accuracy, they are naturally applied at the class level: as you can see in this print of a classification report they are defined for each class. They rely on concepts such as true positives or false negative that require defining which class is the positive one.

             precision    recall  f1-score   support

          0       0.65      1.00      0.79        17
          1       0.57      0.75      0.65        16
          2       0.33      0.06      0.10        17
avg / total       0.52      0.60      0.51        50

The warning

F1 score:/usr/local/lib/python2.7/site-packages/sklearn/metrics/classification.py:676: DeprecationWarning: The 
default `weighted` averaging is deprecated, and from version 0.18, 
use of precision, recall or F-score with multiclass or multilabel data  
or pos_label=None will result in an exception. Please set an explicit 
value for `average`, one of (None, 'micro', 'macro', 'weighted', 
'samples'). In cross validation use, for instance, 
scoring="f1_weighted" instead of scoring="f1".

You get this warning because you are using the f1-score, recall and precision without defining how they should be computed! The question could be rephrased: from the above classification report, how do you output one global number for the f1-score? You could:

Take the average of the f1-score for each class: that's the avg / total result above. It's also called macro averaging.
Compute the f1-score using the global count of true positives / false negatives, etc. (you sum the number of true positives / false negatives for each class). Aka micro averaging.
Compute a weighted average of the f1-score. Using 'weighted' in scikit-learn will weigh the f1-score by the support of the class: the more elements a class has, the more important the f1-score for this class in the computation.

These are 3 of the options in scikit-learn, the warning is there to say you have to pick one. So you have to specify an average argument for the score method.

Which one you choose is up to how you want to measure the performance of the classifier: for instance macro-averaging does not take class imbalance into account and the f1-score of class 1 will be just as important as the f1-score of class 5. If you use weighted averaging however you'll get more importance for the class 5.

The whole argument specification in these metrics is not super-clear in scikit-learn right now, it will get better in version 0.18 according to the docs. They are removing some non-obvious standard behavior and they are issuing warnings so that developers notice it.

Computing scores

Last thing I want to mention (feel free to skip it if you're aware of it) is that scores are only meaningful if they are computed on data that the classifier has never seen. This is extremely important as any score you get on data that was used in fitting the classifier is completely irrelevant.

Here's a way to do it using StratifiedShuffleSplit, which gives you a random splits of your data (after shuffling) that preserve the label distribution.

from sklearn.datasets import make_classification
from sklearn.cross_validation import StratifiedShuffleSplit
from sklearn.metrics import accuracy_score, f1_score, precision_score, recall_score, classification_report, confusion_matrix

# We use a utility to generate artificial classification data.
X, y = make_classification(n_samples=100, n_informative=10, n_classes=3)
sss = StratifiedShuffleSplit(y, n_iter=1, test_size=0.5, random_state=0)
for train_idx, test_idx in sss:
    X_train, X_test, y_train, y_test = X[train_idx], X[test_idx], y[train_idx], y[test_idx]
    svc.fit(X_train, y_train)
    y_pred = svc.predict(X_test)
    print(f1_score(y_test, y_pred, average="macro"))
    print(precision_score(y_test, y_pred, average="macro"))
    print(recall_score(y_test, y_pred, average="macro"))

Hope this helps.

UnicodeDecodeError: 'ascii' codec can't decode byte 0xef in position 1

No problems with my terminal. The above answers helped me looking in the right directions but it didn't work for me until I added 'ignore':

fix_encoding = lambda s: s.decode('utf8', 'ignore')

As indicated in the comment below, this may lead to undesired results. OTOH it also may just do the trick well enough to get things working and you don't care about losing some characters.

Disable/turn off inherited CSS3 transitions

You could also disinherit all transitions inside a containing element:

CSS:

.noTrans *{
-moz-transition: none;
-webkit-transition: none;
-o-transition: color 0 ease-in;
transition: none;
}

HTML:

<a href="#">Content</a>
<a href="#">Content</a>
<div class="noTrans">
<a href="#">Content</a>
</div>
<a href="#">Content</a>

Twitter Bootstrap Button Text Word Wrap

You can add these style's and it works just as expected.

.btn {
    white-space:normal !important; 
    word-wrap: break-word; 
    word-break: normal;
}

rsync: difference between --size-only and --ignore-times

The short answer is that --ignore-times does more than its name implies. It ignores both the time and size. In contrast, --size-only does exactly what it says.

The long answer is that rsync has three ways to decide if a file is outdated:

Compare the size of source and destination.
Compare the timestamp of source and destination.
Compare the static checksum of source and destination.

These checks are performed before transferring data. Notably, this means the static checksum is distinct from the stream checksum - the later is computed while transferring data.

By default, rsync uses only 1 and 2. Both 1 and 2 can be acquired together by a single stat, whereas 3 requires reading the entire file (this is independent from reading the file for transfer). Assuming only one modifier is specified, that means the following:

By using --size-only, only 1 is performed - timestamps and checksum are ignored. A file is copied unless its size is identical on both ends.
By using --ignore-times, neither of 1, 2 or 3 is performed. A file is always copied.
By using --checksum, 3 is used in addition to 1, but 2 is not performed. A file is copied unless size and checksum match. The checksum is only computed if size matches.

Functional, Declarative, and Imperative Programming

In a nutshell, the more a programming style emphasizes What (to do) abstracting away the details of How (to do it) the more that style is considered to be declarative. The opposite is true for imperative. Functional programming is associated with the declarative style.

SSH to Vagrant box in Windows?

Another option using git binaries:

Install git: http://git-scm.com/download/win
Start Menu > cmd (shift+enter to go as Administrator)
set PATH=%PATH%;C:\Program Files\Git\usr\bin
vagrant ssh

Hope this helps :)

Just a bonus after months using that on Windows: use Console instead of the Win terminal, so you can always open a new terminal tab with PATH set (configure it on options)

How do I increase the RAM and set up host-only networking in Vagrant?

To increase the memory or CPU count when using Vagrant 2, add this to your Vagrantfile

Vagrant.configure("2") do |config|
    # usual vagrant config here

    config.vm.provider "virtualbox" do |v|
        v.memory = 1024
        v.cpus = 2
    end
end

How can I run specific migration in laravel

use this command php artisan migrate --path=/database/migrations/my_migration.php it worked for me..

Why am I getting "Cannot Connect to Server - A network-related or instance-specific error"?

In case you might be using the Express Edition:

Add "\SQLEXPRESS" after your server name

e.g. "MY-SERVER\SQLEXPRESS"

enter image description here

Create Log File in Powershell

You might just want to use the new TUN.Logging PowerShell module, this can also send a log mail. Just use the Start-Log and/or Start-MailLog cmdlets to start logging and then just use Write-HostLog, Write-WarningLog, Write-VerboseLog, Write-ErrorLog etc. to write to console and log file/mail. Then call Send-Log and/or Stop-Log at the end and voila, you got your logging. Just install it from the PowerShell Gallery via

Install-Module -Name TUN.Logging

Or just follow the link: https://www.powershellgallery.com/packages/TUN.Logging

Documentation of the module can be found here: https://github.com/echalone/TUN/blob/master/PowerShell/Modules/TUN.Logging/TUN.Logging.md

How can I open the interactive matplotlib window in IPython notebook?

A better solution for your problem might be the Charts library. It enables you to use the excellent Highcharts javascript library to make beautiful and interactive plots. Highcharts uses the HTML svg tag so all your charts are actually vector images.

Some features:

Vector plots which you can download in .png, .jpg and .svg formats so you will never run into resolution problems
Interactive charts (zoom, slide, hover over points, ...)
Usable in an IPython notebook
Explore hundreds of data structures at the same time using the asynchronous plotting capabilities.

Disclaimer: I'm the developer of the library

Returning JSON response from Servlet to Javascript/JSP page

I used JSONObject as shown below in Servlet.

    JSONObject jsonReturn = new JSONObject();

    NhAdminTree = AdminTasks.GetNeighborhoodTreeForNhAdministrator( connection, bwcon, userName);

    map = new HashMap<String, String>();
    map.put("Status", "Success");
    map.put("FailureReason", "None");
    map.put("DataElements", "2");

    jsonReturn = new JSONObject();
    jsonReturn.accumulate("Header", map);

    List<String> list = new ArrayList<String>();
    list.add(NhAdminTree);
    list.add(userName);

    jsonReturn.accumulate("Elements", list);

The Servlet returns this JSON object as shown below:

    response.setContentType("application/json");
    response.getWriter().write(jsonReturn.toString());

This Servlet is called from Browser using AngularJs as below

$scope.GetNeighborhoodTreeUsingPost = function(){
    alert("Clicked GetNeighborhoodTreeUsingPost : " + $scope.userName );

    $http({

        method: 'POST',
        url : 'http://localhost:8080/EPortal/xlEPortalService',
        headers: {
           'Content-Type': 'application/json'
         },
        data : {
            'action': 64,
            'userName' : $scope.userName
        }
    }).success(function(data, status, headers, config){
        alert("DATA.header.status : " + data.Header.Status);
        alert("DATA.header.FailureReason : " + data.Header.FailureReason);
        alert("DATA.header.DataElements : " + data.Header.DataElements);
        alert("DATA.elements : " + data.Elements);

    }).error(function(data, status, headers, config) {
        alert(data + " : " + status + " : " + headers + " : " + config);
    });

};

This code worked and it is showing correct data in alert dialog box:

Data.header.status : Success

Data.header.FailureReason : None

Data.header.DetailElements : 2

Data.Elements : Coma seperated string values i.e. NhAdminTree, userName

How do I create an .exe for a Java program?

If you really want an exe Excelsior JET is a professional level product that compiles to native code:

http://www.excelsior-usa.com/jet.html

You can also look at JSMooth:

http://jsmooth.sourceforge.net/

And if your application is compatible with its compatible with AWT/Apache classpath then GCJ compiles to native exe.

Installing specific laravel version with composer create-project

From the composer help create-project command

The create-project command creates a new project from a given
package into a new directory. If executed without params and in a directory with a composer.json file it installs the packages for the current project.
You can use this command to bootstrap new projects or setup a clean
version-controlled installation for developers of your project.

[version]
You can also specify the version with the package name using = or : as separator.
To install unstable packages, either specify the version you want, or use the --stability=dev (where dev can be one of RC, beta, alpha or dev).

This command works:

composer create-project laravel/laravel=4.1.27 your-project-name --prefer-dist

This works with the * notation.

How do I use TensorFlow GPU?

First you need to install tensorflow-gpu, because this package is responsible for gpu computations. Also remember to run your code with environment variable CUDA_VISIBLE_DEVICES = 0 (or if you have multiple gpus, put their indices with comma). There might be some issues related to using gpu. if your tensorflow does not use gpu anyway, try this

How can I convert byte size into a human-readable format in Java?

You can use StringUtils’s TraditionalBinarPrefix:

public static String humanReadableInt(long number) {
    return TraditionalBinaryPrefix.long2String(number, ””, 1);
}

Remove all items from RecyclerView

You have better clear the array-list that you used for recyleview adapter.

arraylist.clear();

Open File Dialog, One Filter for Multiple Excel Extensions?

Use a semicolon

OpenFileDialog of = new OpenFileDialog();
of.Filter = "Excel Files|*.xls;*.xlsx;*.xlsm";

open cv error: (-215) scn == 3 || scn == 4 in function cvtColor

2015-05-27-191152.jpg << Looking back at your image format, I occasionally confused between .png and .jpg and encountered the same error.

Best practice multi language website

Database work:

Create Language Table ‘languages’:

Fields:

language_id(primary and auto increamented)

language_name

created_at

created_by

updated_at

updated_by

Create a table in database ‘content’:

Fields:

content_id(primary and auto incremented)

main_content

header_content

footer_content

leftsidebar_content

rightsidebar_content

language_id(foreign key: referenced to languages table)

created_at

created_by

updated_at

updated_by

Front End Work:

When user selects any language from dropdown or any area then save selected language id in session like,

$_SESSION['language']=1;

Now fetch data from database table ‘content’ based on language id stored in session.

Detail may found here http://skillrow.com/multilingual-website-in-php-2/

How to get HTTP response code for a URL in Java?

HttpURLConnection connection = (HttpURLConnection) url.openConnection();
            connection.setDoOutput(true);
            connection.setDoInput(true);
            connection.setRequestMethod("POST");

. . . . . . .

System.out.println("Value" + connection.getResponseCode());
             System.out.println(connection.getResponseMessage());
             System.out.println("content"+connection.getContent());

How do I make an Android EditView 'Done' button and hide the keyboard when clicked?

Kotlin Solution

The direct way to handle the hide keyboard + done action in Kotlin is:

// Set action
edittext.setOnEditorActionListener { _, actionId, _ ->
    if (actionId == EditorInfo.IME_ACTION_DONE) {
        // Hide Keyboard
        val inputMethodManager = context.getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
        inputMethodManager.hideSoftInputFromWindow(windowToken, 0)
        true
    }
    false
}

Kotlin Extension

Use this to call edittext.onDone {/*action*/} in your main code. Keeps it more readable and maintainable

edittext.onDone { edittext.hideKeyboard() }

fun View.hideKeyboard() {
    val inputMethodManager = context.getSystemService(INPUT_METHOD_SERVICE) as InputMethodManager
    inputMethodManager.hideSoftInputFromWindow(windowToken, 0)
}

fun EditText.onDone(callback: () -> Unit) {
    // These lines optional if you don't want to set in Xml
    imeOptions = EditorInfo.IME_ACTION_DONE
    maxLines = 1
    setOnEditorActionListener { _, actionId, _ ->
        if (actionId == EditorInfo.IME_ACTION_DONE) {
            callback.invoke()
            true
        }
        false
    }
}

Additional Keyboard Extensions

If you'd like more ways to simplify working with the keyboard (show, close, focus): Read this post

Don't forget to add these options to your edittext Xml, if not in code

<EditText ...
    android:imeOptions="actionDone"
    android:inputType="text"/>

Need inputType="textMultiLine" support? Read this post and don't add imeOptions or inputType in Xml

AngularJS How to dynamically add HTML and bind to controller

See if this example provides any clarification. Basically you configure a set of routes and include partial templates based on the route. Setting ng-view in your main index.html allows you to inject those partial views.

The config portion looks like this:

  .config(['$routeProvider', function($routeProvider) {
    $routeProvider
      .when('/', {controller:'ListCtrl', templateUrl:'list.html'})
      .otherwise({redirectTo:'/'});
  }])

The point of entry for injecting the partial view into your main template is:

<div class="container" ng-view=""></div>

Jquery post, response in new window

Use the write()-Method of the Popup's document to put your markup there:

$.post(url, function (data) {
    var w = window.open('about:blank');
    w.document.open();
    w.document.write(data);
    w.document.close();
});

How do I connect to a Websphere Datasource with a given JNDI name?

Jason,

This is how it works.

Localnamespace - java:comp/env is a local name space used by the application. The name that you use in it jdbc/db is just an alias. It does not refer to a physical resource.

During deployment this alias should be mapped to a physical resource (in your case a data source) that is defined on the WAS/WPS run time.

This is actually stored in ejb-bnd.xmi files. In the latest versions the XMIs are replaced with XML files. These files are referred to as the Binding files.

HTH Manglu

How to create JSON string in C#

You could use the JavaScriptSerializer class, check this article to build an useful extension method.

Code from article:

namespace ExtensionMethods
{
    public static class JSONHelper
    {
        public static string ToJSON(this object obj)
        {
            JavaScriptSerializer serializer = new JavaScriptSerializer();
            return serializer.Serialize(obj);
        }

        public static string ToJSON(this object obj, int recursionDepth)
        {
            JavaScriptSerializer serializer = new JavaScriptSerializer();
            serializer.RecursionLimit = recursionDepth;
            return serializer.Serialize(obj);
        }
    }
}

Usage:

using ExtensionMethods;

...

List<Person> people = new List<Person>{
                   new Person{ID = 1, FirstName = "Scott", LastName = "Gurthie"},
                   new Person{ID = 2, FirstName = "Bill", LastName = "Gates"}
                   };


string jsonString = people.ToJSON();

Remove scroll bar track from ScrollView in Android

To remove a scrollbar from a view (and its subclass) via xml:

android:scrollbars="none"

http://developer.android.com/reference/android/view/View.html#attr_android:scrollbars

Can I set background image and opacity in the same property?

Well the only CSS way of doing only background transparency is via RGBa but since you want to use an image I would suggest using Photoshop or Gimp to make the image transparent and then using it as the background.

How to define hash tables in Bash?

hput () {
  eval hash"$1"='$2'
}

hget () {
  eval echo '${hash'"$1"'#hash}'
}
hput France Paris
hput Netherlands Amsterdam
hput Spain Madrid
echo `hget France` and `hget Netherlands` and `hget Spain`

$ sh hash.sh
Paris and Amsterdam and Madrid

R programming: How do I get Euler's number?

Entity Framework Query for inner join

You could use a navigation property if its available. It produces an inner join in the SQL.

from s in db.Services
where s.ServiceAssignment.LocationId == 1
select s

What causes a Python segmentation fault?

I was experiencing this segmentation fault after upgrading dlib on RPI. I tracebacked the stack as suggested by Shiplu Mokaddim above and it settled on an OpenBLAS library.

Since OpenBLAS is also multi-threaded, using it in a muilt-threaded application will exponentially multiply threads until segmentation fault. For multi-threaded applications, set OpenBlas to single thread mode.

In python virtual environment, tell OpenBLAS to only use a single thread by editing:

    $ workon <myenv>
    $ nano .virtualenv/<myenv>/bin/postactivate

and add:

    export OPENBLAS_NUM_THREADS=1 
    export OPENBLAS_MAIN_FREE=1

After reboot I was able to run all my image recognition apps on rpi3b which were previously crashing it.

reference: https://github.com/ageitgey/face_recognition/issues/294

How to select the nth row in a SQL database table?

For SQL server, the following will return the first row from giving table.

declare @rowNumber int = 1;
    select TOP(@rowNumber) * from [dbo].[someTable];
EXCEPT
    select TOP(@rowNumber - 1) * from [dbo].[someTable];

You can loop through the values with something like this:

WHILE @constVar > 0
BEGIN
    declare @rowNumber int = @consVar;
       select TOP(@rowNumber) * from [dbo].[someTable];
    EXCEPT
       select TOP(@rowNumber - 1) * from [dbo].[someTable];  

       SET @constVar = @constVar - 1;    
END;

How to change option menu icon in the action bar?

this work for me, just set your xml menu like this:

<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <item
        android:icon="@drawable/your_icon"
        android:title="menu"
        app:showAsAction="always">
        <menu>

            <item
                android:id="@+id/action_menu1"
                android:orderInCategory="1"
                android:title="menu 1" />

            <item
                android:id="@+id/action_menu2"
                android:orderInCategory="2"
                android:title="menu 2" />

        </menu>
    </item>
</menu>

Is it possible to add an HTML link in the body of a MAILTO link

I have implement following it working for iOS devices but failed on android devices

<a  href="mailto:?subject=Your mate might be interested...&body=<div style='padding: 0;'><div style='padding: 0;'><p>I found this on the site I think you might find it interesting.  <a href='@(Request.Url.ToString())' >Click here </a></p></div></div>">Share This</a>

Plot a horizontal line using matplotlib

You are correct, I think the [0,len(xs)] is throwing you off. You'll want to reuse the original x-axis variable xs and plot that with another numpy array of the same length that has your variable in it.

annual = np.arange(1,21,1)
l = np.array(value_list) # a list with 20 values
spl = UnivariateSpline(annual,l)
xs = np.linspace(1,21,200)
plt.plot(xs,spl(xs),'b')

#####horizontal line
horiz_line_data = np.array([40 for i in xrange(len(xs))])
plt.plot(xs, horiz_line_data, 'r--') 
###########plt.plot([0,len(xs)],[40,40],'r--',lw=2)
pylab.ylim([0,200])
plt.show()

Hopefully that fixes the problem!

Is it possible to display my iPhone on my computer monitor?

If your iPhone is jailbroken you can use DemoGod

Cannot connect to local SQL Server with Management Studio

I was having this problem on a Windows 7 (64 bit) after a power outage. The SQLEXPRESS service was not started even though is status was set to 'Automatic' and the mahine had been rebooted several times. Had to start the service manually.

How to make <input type="date"> supported on all browsers? Any alternatives?

<html>
<head>
<title>Date picker works for all browsers(IE, Firefox, Chrome)</title>
<script>
    var datefield = document.createElement("input")
    datefield.setAttribute("type", "date")
    if (datefield.type != "date") { // if browser doesn't support input type="date", load files for jQuery UI Date Picker
        document.write('<link href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css" rel="stylesheet" type="text/css" />\n')
        document.write('<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"><\/script>\n')
        document.write('<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js"><\/script>\n')
    }
</script>

<script>
    if (datefield.type != "date") { // if browser doesn't support input type="date", initialize date picker widget:
        jQuery(function($) { // on document.ready
            $('#start_date').datepicker({
                dateFormat: 'yy-mm-dd'
            });
            $('#end_date').datepicker({
                dateFormat: 'yy-mm-dd'
            });
        })
    }
</script>
</head>
<body>
    <input name="start_date" id="start_date" type="date" required>
    <input name="end_date" id="end_date" required>
</body>
</html>

Modal width (increase)

Bootstrap 4 includes sizing utilities. You can change the size to 25/50/75/100% of the page width (I wish there were even more increments).

To use these we will replace the modal-lg class. Both the default width and modal-lg use css max-width to control the modal's width, so first add the mw-100 class to effectively disable max-width. Then just add the width class you want, e.g. w-75.

Note that you should place the mw-100 and w-75 classes in the div with the modal-dialog class, not the modal div e.g.,

<div class='modal-dialog mw-100 w-75'>
    ...
</div>

How do I extract data from JSON with PHP?

// Using json as php array 

$json = '[{"user_id":"1","user_name":"Sayeed Amin","time":"2019-11-06 13:21:26"}]';

//or use from file
//$json = file_get_contents('results.json');

$someArray = json_decode($json, true);

foreach ($someArray as $key => $value) {
    echo $value["user_id"] . ", " . $value["user_name"] . ", " . $value["time"] . "<br>";
}

How to execute function in SQL Server 2008

I have come to this question and the one below several times.

how to call scalar function in sql server 2008

Each time, I try entering the Function using the syntax shown here in SQL Server Management Studio, or SSMS, to see the results, and each time I get the errors.

For me, that is because my result set is in tabular data format. Therefore, to see the results in SSMS, I have to call it like this:

SELECT * FROM dbo.Afisho_rankimin_TABLE(5);

I understand that the author's question involved a scalar function, so this answer is only to help others who come to StackOverflow often when they have a problem with a query (like me).

I hope this helps others.

How do I copy directories recursively with gulp?

Turns out that to copy a complete directory structure gulp needs to be provided with a base for your gulp.src() method.

So gulp.src( [ files ], { "base" : "." }) can be used in the structure above to copy all the directories recursively.

If, like me, you may forget this then try:

gulp.copy=function(src,dest){
    return gulp.src(src, {base:"."})
        .pipe(gulp.dest(dest));
};

How can I search for a commit message on GitHub?

Using Advanced Search on Github seemed the easiest with a combination of other answers. It's basically a search string builder. https://github.com/search/advanced

For example I wanted to find all commits in Autodesk/maya-usd containing "USD"

Then in the search results can choose Commits from the list on the left:

Single TextView with multiple colored text

I have done this, try it:

TextView textView=(TextView)findViewById(R.id.yourTextView);//init

//here I am appending two string into my textView with two diff colors.
//I have done from fragment so I used here getActivity(), 
//If you are trying it from Activity then pass className.this or this; 

textView.append(TextViewUtils.getColoredString(getString(R.string.preString),ContextCompat.getColor(getActivity(),R.color.firstColor)));
textView.append(TextViewUtils.getColoredString(getString(R.string.postString),ContextCompat.getColor(getActivity(),R.color.secondColor)));

Inside your TextViewUtils class add this method:

 /***
 *
 * @param mString this will setup to your textView
 * @param colorId  text will fill with this color.
 * @return string with color, it will append to textView.
 */
public static Spannable getColoredString(String mString, int colorId) {
    Spannable spannable = new SpannableString(mString);
    spannable.setSpan(new ForegroundColorSpan(colorId), 0, spannable.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    Log.d(TAG,spannable.toString());
    return spannable;
}

How to append output to the end of a text file

Using tee with option -a (--append) allows you to append to multiple files at once and also to use sudo (very useful when appending to protected files). Besides that, it is interesting if you need to use other shells besides bash, as not all shells support the > and >> operators

echo "hello world" | sudo tee -a output.txt

This thread has good answers about tee

Add two textbox values and display the sum in a third textbox automatically

Try this: Open given fiddle in CHROME

function sum() {
      var txtFirstNumberValue = document.getElementById('txt1').value;
      var txtSecondNumberValue = document.getElementById('txt2').value;
      var result = parseInt(txtFirstNumberValue) + parseInt(txtSecondNumberValue);
      if (!isNaN(result)) {
         document.getElementById('txt3').value = result;
      }
}

HTML

<input type="text" id="txt1"  onkeyup="sum();" />
<input type="text" id="txt2"  onkeyup="sum();" />
<input type="text" id="txt3" />

DEMO HERE

How to make execution pause, sleep, wait for X seconds in R?

See help(Sys.sleep).

For example, from ?Sys.sleep

testit <- function(x)
{
    p1 <- proc.time()
    Sys.sleep(x)
    proc.time() - p1 # The cpu usage should be negligible
}
testit(3.7)

Yielding

> testit(3.7)
   user  system elapsed 
  0.000   0.000   3.704

How to echo print statements while executing a sql script

For mysql you can add \p to the commands to have them print out while they run in the script:

SELECT COUNT(*) FROM `mysql`.`user`
\p;

Run it in the MySQL client:

mysql> source example.sql
--------------
SELECT COUNT(*) FROM `mysql`.`user`
--------------

+----------+
| COUNT(*) |
+----------+
|       24 |
+----------+
1 row in set (0.00 sec)

Programs & Examples On #Hid device

PHP Warning: mysqli_connect(): (HY000/2002): Connection refused

Avoid "current URL string parser is deprecated" warning by setting useNewUrlParser to true

The type arguments cannot be inferred from the usage. Try specifying the type arguments explicitly

Javascript Cookie with no expiration date

Tomcat view catalina.out log file

What is the advantage of using heredoc in PHP?

How to configure postgresql for the first time?

How do I compare version numbers in Python?

How to use Git?

Web Application Problems (web.config errors) HTTP 500.19 with IIS7.5 and ASP.NET v2

How to Empty Caches and Clean All Targets Xcode 4 and later

How do you do dynamic / dependent drop downs in Google Sheets?

DateTime group by date and hour

Overwriting txt file in java

What are the ways to make an html link open a folder

How to make a script wait for a pressed key?

Why do I have ORA-00904 even when the column is present?

How can I brew link a specific version?

How to convert current date into string in java?

Load external css file like scripts in jquery which is compatible in ie also

join list of lists in python

How do I make a column unique and index it in a Ruby on Rails migration?

How to set the env variable for PHP?

Converting file into Base64String and back again

Find mouse position relative to element

git push rejected: error: failed to push some refs

SQL - How to select a row having a column with max value

Compare dates in MySQL

How to start and stop android service from a adb shell?

How to convert JSONObjects to JSONArray?

How to call a REST web service API from JavaScript?

Get column index from column name in python pandas

Adding class to element using Angular JS

Wait until all promises complete even if some rejected

How to write a:hover in inline CSS?

Explicit vs implicit SQL joins

How do I filter an array with TypeScript in Angular 2?

How can I read a text file from the SD card in Android?

Redirecting exec output to a buffer or file

How to configure SMTP settings in web.config

How to print a debug log?

Testing two JSON objects for equality ignoring child order in Java

Cannot connect to the Docker daemon at unix:/var/run/docker.sock. Is the docker daemon running?

How to connect Robomongo to MongoDB

Jenkins Pipeline Wipe Out Workspace

Bring a window to the front in WPF

How can I get relative path of the folders in my android project?

Find all elements with a certain attribute value in jquery

Which data structures and algorithms book should I buy?

var.replace is not a function

How to upgrade PowerShell version from 2.0 to 3.0

Disable arrow key scrolling in users browser

Summary

Original answer

References

How to access data/data folder in Android device?

How to Edit a row in the datatable

How to create a new variable in a data.frame based on a condition?

Tracing XML request/responses with JAX-WS

How to get AM/PM from a datetime in PHP

What does the 'static' keyword do in a class?

Should you use .htm or .html file extension? What is the difference, and which file is correct?

Android: How to create a Dialog without a title?

Closing a file after File.Create

Convert date to datetime in Python

How do I convert struct System.Byte byte[] to a System.IO.Stream object in C#?

Looking for a short & simple example of getters/setters in C#

How to list all databases in the mongo shell?

All shards failed

Dismissing a Presented View Controller

jQuery - Increase the value of a counter when a button is clicked

Can't install laravel installer via composer

Can you explain the HttpURLConnection connection process?

PHP Excel Header

C# Parsing JSON array of objects

How do I set up HttpContent for my HttpClient PostAsync second parameter?

OR operator in switch-case?

Under the hood:

Abort Ajax requests using jQuery

The ultimate guide to upgrading `mysql_*` functions to MySQLi API

Using the `pathlib` module (python's object-oriented filesystem paths)