Not exactly the same style, but I think it&#39;s done using the [calendar example][1] of D3.js.

If you do a &quot;View Source&quot; on GitHub&#39;s page, you&#39;ll see that they&#39;re using D3 for rendering their calendar.

A similar look is achieved by [js-chart-widgets][2].


  [1]: http://mbostock.github.com/d3/talk/20111018/calendar.html
  [2]: https://github.com/loule/js-chart-widgets/

The Github Contributions calendar is using D3. If you inspect your network traffic you&#39;ll see the request for the JS and you can look through the source yourself. 

EDIT: I&#39;ve removed the source link as the CDN url is likely to change over time. It should still be locatable if you take a look with your web inspector.

I currently have:

    CREATE TABLE  galleries_gallery (
    	id				INT NOT NULL PRIMARY KEY IDENTITY,
    	title			NVARCHAR(50) UNIQUE NOT NULL,
    	description		VARCHAR(256),
    	templateID		INT NOT NULL REFERENCES galleries_templates(id),
    	jsAltImgID		INT NOT NULL REFERENCES libraryImage(id)
    	jsAltText		NVARCHAR(500),
    	dateCreated		SMALLDATETIME NOT NULL,
    	dateUpdated		SMALLDATETIME NOT NULL,
    	lastUpdatedBy	INT,
    	deleted			BIT NOT NULL DEFAULT 0
    );

But this adds constraints with auto generated names which make it hard to drop the constraint later. What do I need to add in order to name the constraints?

The above example is SQL Server and I also need it in PostgreSQL.

Adding named foreign key constraints in a SQL Create statement

I&#39;m trying to implement new Android Google Maps API (v2). However it doesn&#39;t seem to go well with [SlidingMenu][1]. As you may know, `MapFragment` implementation is based on `SurfaceView`. The problem is that the `SurfaceView` doesn&#39;t like moving it around - I mean placing it in movable views:

 - [`ViewPager`][2], 
 - [`ScrollView`][3], 
 - [`ListView`][4],
 - or the aforementioned `SlidingMenu`. 

When you move it, it leaves a black hole in the place where its pixels originally layed. It looks something like [this][5].

This problem can be partially solved by specifying a transparent background on the `SurfaceView` or even placing a transparent `View` over it. I just can&#39;t figure if only for me the results are unacceptable, or if I have a different problem which makes it look how it looks. 

**To see how it looks, please watch [THIS VIDEO][6].**

(sorry for the quality, but the problem can be seen easily anyway)


When a normal listview (the orange screen) is pulled away while opening `SlidingMenu`, the animation is smooth and nice. But as soon as the `MapFragment` appears, there&#39;s some weird refreshing/flickering/synchronization issue on the map.

Tested on HTC One S and Samsung Galaxy ACE.

----------

&lt;strike&gt;My super-duper-crazy idea of solving it: each time the opening animation starts, take a screenshot of the `MapFragment` (it should be possible with SurfaceView) and lay it over for the duration of the animation. But I really don&#39;t know how to do it...&lt;/strike&gt;
[Taking screenshot of a map isn&#39;t possible][7], but maybe someone will get inspired by this.

Or maybe disable redrawing the map some other way, I don&#39;t know. 


----------

**UPDATE:**

Found [this][8].

It appears that SurfaceView can be changed to TextureView to remove those limitations. But since MapFragment is based on SurfaceView, I don&#39;t know if it can be achieved.

**Another update**
It appears that this issue has been resolved on devices 4.1+. They just used TextureView. but on lower versions we still have to use workarounds.

  [1]: https://github.com/jfeinstein10/SlidingMenu
  [2]: https://stackoverflow.com/questions/13837697/viewpager-with-google-maps-api-v2-mysterious-black-view/13993640#13993640
  [3]: https://stackoverflow.com/questions/13746351/mapfragment-in-scrollview
  [4]: https://stackoverflow.com/questions/14218124/new-gms-maps-mapview-rendering-lags-a-bit-when-in-a-listview?lq=1
  [5]: https://f.cloud.github.com/assets/2045380/11888/0cf2b480-456b-11e2-8633-277dac130328.png
  [6]: http://youtu.be/qSBuFqMliJM
  [7]: https://stackoverflow.com/questions/13773658/capture-screen-shot-of-googlemap-android-api-v2
  [8]: http://android-developers.blogspot.com/2011/11/android-40-graphics-and-animations.html

Moving MapFragment (SurfaceView) causes black background flickering

There is a wonderful contributions chart that github.com came with.

![enter image description here][1]

Does anybody know if they use some kind of library or gem? 

If it is open source, I would like to use it my project as well. It looks great!



  [1]: http://i.stack.imgur.com/43Wc0.png

Github contributions graph

There is a wonderful contributions chart that github.com came with.
<img src="http://i.stack.imgur.com/43Wc0.png" alt="enter image description here">
Does anybody know if they use some kind of library or gem?
If it is open source, I would like to use it my project as well. It looks great!

I want to mandate that the value of a text box is lowercase using JavaScript. I&#39;ve tried the code below, but the cursor jumps to the end of the input every time you press a key. How can I avoid this?

    $(&quot;#beLowerCase&quot;).keyup(function(){
        $(this).val( $(this).val().toLowerCase() );
    });


Updating an input&#39;s value without losing cursor position

I am looking for a simple code to create a WebSocket server. I found phpwebsockets but it is outdated now and doesn&#39;t support the newest protocol. I tried updating it myself but it doesn&#39;t seem to work.  

	#!/php -q
	&lt;?php  /*  &gt;php -q server.php  */

	error_reporting(E_ALL);
	set_time_limit(0);
	ob_implicit_flush();

	$master  = WebSocket(&quot;localhost&quot;,12345);
	$sockets = array($master);
	$users   = array();
	$debug   = false;

	while(true){
	  $changed = $sockets;
	  socket_select($changed,$write=NULL,$except=NULL,NULL);
	  foreach($changed as $socket){
		if($socket==$master){
		  $client=socket_accept($master);
		  if($client&lt;0){ console(&quot;socket_accept() failed&quot;); continue; }
		  else{ connect($client); }
		}
		else{
		  $bytes = @socket_recv($socket,$buffer,2048,0);
		  if($bytes==0){ disconnect($socket); }
		  else{
			$user = getuserbysocket($socket);
			if(!$user-&gt;handshake){ dohandshake($user,$buffer); }
			else{ process($user,$buffer); }
		  }
		}
	  }
	}

	//---------------------------------------------------------------
	function process($user,$msg){
	  $action = unwrap($msg);
	  say(&quot;&lt; &quot;.$action);
	  switch($action){
		case &quot;hello&quot; : send($user-&gt;socket,&quot;hello human&quot;);                       break;
		case &quot;hi&quot;    : send($user-&gt;socket,&quot;zup human&quot;);                         break;
		case &quot;name&quot;  : send($user-&gt;socket,&quot;my name is Multivac, silly I know&quot;); break;
		case &quot;age&quot;   : send($user-&gt;socket,&quot;I am older than time itself&quot;);       break;
		case &quot;date&quot;  : send($user-&gt;socket,&quot;today is &quot;.date(&quot;Y.m.d&quot;));           break;
		case &quot;time&quot;  : send($user-&gt;socket,&quot;server time is &quot;.date(&quot;H:i:s&quot;));     break;
		case &quot;thanks&quot;: send($user-&gt;socket,&quot;you&#39;re welcome&quot;);                    break;
		case &quot;bye&quot;   : send($user-&gt;socket,&quot;bye&quot;);                               break;
		default      : send($user-&gt;socket,$action.&quot; not understood&quot;);           break;
	  }
	}

	function send($client,$msg){
	  say(&quot;&gt; &quot;.$msg);
	  $msg = wrap($msg);
	  socket_write($client,$msg,strlen($msg));
	}

	function WebSocket($address,$port){
	  $master=socket_create(AF_INET, SOCK_STREAM, SOL_TCP)     or die(&quot;socket_create() failed&quot;);
	  socket_set_option($master, SOL_SOCKET, SO_REUSEADDR, 1)  or die(&quot;socket_option() failed&quot;);
	  socket_bind($master, $address, $port)                    or die(&quot;socket_bind() failed&quot;);
	  socket_listen($master,20)                                or die(&quot;socket_listen() failed&quot;);
	  echo &quot;Server Started : &quot;.date(&#39;Y-m-d H:i:s&#39;).&quot;\n&quot;;
	  echo &quot;Master socket  : &quot;.$master.&quot;\n&quot;;
	  echo &quot;Listening on   : &quot;.$address.&quot; port &quot;.$port.&quot;\n\n&quot;;
	  return $master;
	}

	function connect($socket){
	  global $sockets,$users;
	  $user = new User();
	  $user-&gt;id = uniqid();
	  $user-&gt;socket = $socket;
	  array_push($users,$user);
	  array_push($sockets,$socket);
	  console($socket.&quot; CONNECTED!&quot;);
	}

	function disconnect($socket){
	  global $sockets,$users;
	  $found=null;
	  $n=count($users);
	  for($i=0;$i&lt;$n;$i++){
		if($users[$i]-&gt;socket==$socket){ $found=$i; break; }
	  }
	  if(!is_null($found)){ array_splice($users,$found,1); }
	  $index = array_search($socket,$sockets);
	  socket_close($socket);
	  console($socket.&quot; DISCONNECTED!&quot;);
	  if($index&gt;=0){ array_splice($sockets,$index,1); }
	}

	function dohandshake($user,$buffer){
	  console(&quot;\nRequesting handshake...&quot;);
	  console($buffer);
	  //list($resource,$host,$origin,$strkey1,$strkey2,$data) 
	  list($resource,$host,$u,$c,$key,$protocol,$version,$origin,$data) = getheaders($buffer);
	  console(&quot;Handshaking...&quot;);

		$acceptkey = base64_encode(sha1($key . &quot;258EAFA5-E914-47DA-95CA-C5AB0DC85B11&quot;,true));
	  $upgrade  = &quot;HTTP/1.1 101 Switching Protocols\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Accept: $acceptkey\r\n&quot;;

	  socket_write($user-&gt;socket,$upgrade,strlen($upgrade));
	  $user-&gt;handshake=true;
	  console($upgrade);
	  console(&quot;Done handshaking...&quot;);
	  return true;
	}

	function getheaders($req){
		$r=$h=$u=$c=$key=$protocol=$version=$o=$data=null;
		if(preg_match(&quot;/GET (.*) HTTP/&quot;   ,$req,$match)){ $r=$match[1]; }
		if(preg_match(&quot;/Host: (.*)\r\n/&quot;  ,$req,$match)){ $h=$match[1]; }
		if(preg_match(&quot;/Upgrade: (.*)\r\n/&quot;,$req,$match)){ $u=$match[1]; }
		if(preg_match(&quot;/Connection: (.*)\r\n/&quot;,$req,$match)){ $c=$match[1]; }
		if(preg_match(&quot;/Sec-WebSocket-Key: (.*)\r\n/&quot;,$req,$match)){ $key=$match[1]; }
		if(preg_match(&quot;/Sec-WebSocket-Protocol: (.*)\r\n/&quot;,$req,$match)){ $protocol=$match[1]; }
		if(preg_match(&quot;/Sec-WebSocket-Version: (.*)\r\n/&quot;,$req,$match)){ $version=$match[1]; }
		if(preg_match(&quot;/Origin: (.*)\r\n/&quot;,$req,$match)){ $o=$match[1]; }
		if(preg_match(&quot;/\r\n(.*?)\$/&quot;,$req,$match)){ $data=$match[1]; }
		return array($r,$h,$u,$c,$key,$protocol,$version,$o,$data);
	}

	function getuserbysocket($socket){
	  global $users;
	  $found=null;
	  foreach($users as $user){
		if($user-&gt;socket==$socket){ $found=$user; break; }
	  }
	  return $found;
	}

	function     say($msg=&quot;&quot;){ echo $msg.&quot;\n&quot;; }
	function    wrap($msg=&quot;&quot;){ return chr(0).$msg.chr(255); }
	function  unwrap($msg=&quot;&quot;){ return substr($msg,1,strlen($msg)-2); }
	function console($msg=&quot;&quot;){ global $debug; if($debug){ echo $msg.&quot;\n&quot;; } }

	class User{
	  var $id;
	  var $socket;
	  var $handshake;
	}

	?&gt;

and the client:  

	var connection = new WebSocket(&#39;ws://localhost:12345&#39;);
	connection.onopen = function () {
	  connection.send(&#39;Ping&#39;); // Send the message &#39;Ping&#39; to the server
	};

	// Log errors
	connection.onerror = function (error) {
	  console.log(&#39;WebSocket Error &#39; + error);
	};

	// Log messages from the server
	connection.onmessage = function (e) {
	  console.log(&#39;Server: &#39; + e.data);
	};

If there is anything wrong in my code can you help me fix it? Console in Firefox says:

&gt;Firefox can&#39;t establish a connection to the server at ws://localhost:12345/.


How to create websockets server in PHP

I have a few checkboxes:

    &lt;input type=&#39;checkbox&#39; value=&quot;apple&quot; checked&gt;
    &lt;input type=&#39;checkbox&#39; value=&quot;orange&quot;&gt;
    &lt;input type=&#39;checkbox&#39; value=&quot;pear&quot; checked&gt;
    &lt;input type=&#39;checkbox&#39; value=&quot;naartjie&quot;&gt;

That I would like to bind to a list in my controller such that whenever a checkbox is changed the controller maintains a list of all the checked values, for example, `[&#39;apple&#39;, &#39;pear&#39;]`.

ng-model seems to only be able to bind the value of one single checkbox to a variable in the controller.

Is there another way to do it so that I can bind the four checkboxes to a list in the controller?


How do I bind to list of checkbox values with AngularJS?

I need to close server after getting callback from `/auth/github/callback`
url. With usual **[HTTP API](http://nodejs.org/docs/latest/api/http.html)** closing
server is currently supporting with [`server.close([callback])`](http://nodejs.org/docs/latest/api/http.html)
API function, but with node-express server i’m getting `TypeError: Object function app(req, res){ app.handle(req, res); } has no method &#39;close&#39;`
error. And I don&#39;t know how to find information to solve this problem.  
**How should I close express server?**
	

NodeJS configuration notes:

	$ node --version
	v0.8.17
	$ npm --version
	1.2.0
	$ npm view express version
	3.0.6

Actual application code:

	var app = express();

	// configure Express
	app.configure(function() {
		// … configuration
	});

	app.get(
		&#39;/auth/github/callback&#39;,
		passport.authenticate(&#39;github&#39;, { failureRedirect: &#39;/login&#39; }),
		function(req, res) {
			res.redirect(&#39;/&#39;);
			
			setTimeout(function () {
				app.close();
				// TypeError: Object function app(req, res){ app.handle(req, res); } has no method &#39;close&#39;
			}, 3000)
		}
	);

	app.listen(&#39;http://localhost:5000/&#39;);

Also, I have found [‘nodejs express close…’](https://stackoverflow.com/questions/13293257/nodejs-express-close-server-when-request-is-done?rq=1) but I don&#39;t sure if I can use it with code I have: `var app = express();`.

how to properly close node-express server?

I have a dynamic web page where  I need to import an external JS file (under an `IF` condition) inside another javascript file.

I tried to search for a feasible solution but it didn&#39;t work.

I have tried loading a JS file to the DOM using `document.createElement()` but it also didn&#39;t work. Apparently the Js was loaded into the DOM but was not accessible in the current JS file.

Solution in jQuery will also be fine


Dynamically load JS inside JS

The default Rails 4 project generator now creates the directory &quot;concerns&quot; under controllers and models. I have found some explanations about how to use routing concerns, but nothing about controllers or models.

I am pretty sure it has to do with the current &quot;DCI trend&quot; in the community and would like to give it a try.

The question is, how am I supposed to use this feature, is there a convention on how to define the naming / class hierarchy in order to make it work? How can I include a concern in a model or controller?

How to use concerns in Rails 4

Locally I just interrupt (ctrl-c) and then start it again.

How do I do the same thing with an app on heroku?

How to restart a rails server on Heroku?

I have a Backbone model in my app which is not a typical flat object, it&#39;s a large nested object and we store the nested parts in TEXT columns in a MySQL database.

I wanted to handle the JSON encoding/decoding in Rails API so that from outside it looks like you can POST/GET this one large nested JSON object even if parts of it are stored as stringified JSON text.

However, I ran into an issue where Rails magically converts empty arrays to `nil` values. For example, if I POST this:

    {
      name: &quot;foo&quot;,
      surname: &quot;bar&quot;,
      nested_json: {
        complicated: []
      }
    }
  
My Rails controller sees this:

    {
      :name =&gt; &quot;foo&quot;,
      :surname =&gt; &quot;bar&quot;,
      :nested_json =&gt; {
        :complicated =&gt; nil
      }
    }

And so my JSON data has been altered..

Has anyone run into this issue before? Why would Rails be modifying my POST data?

**UPDATE**

Here is where they do it:

https://github.com/rails/rails/blob/master/actionpack/lib/action_dispatch/http/request.rb#L288

And here is ~why they do it:

https://github.com/rails/rails/pull/8862



So now the question is, how to best deal with this in my nested JSON API situation?

Rails converts empty arrays into nils in params of the request

I am making an API where in the access token for Facebook login will be sent in through header data.

How do I read this data from the header?

Reading header data in Ruby on Rails

If the `protect_from_forgery` option is mentioned in application_controller, then I can log in and perform any GET requests, but on very first POST request Rails resets the session, which logs me out.

I turned the `protect_from_forgery` option off temporarily, but would like to use it with Angular.js. Is there some way to do that?

Rails CSRF Protection + Angular.js: protect_from_forgery makes me to log out on POST

I made a pull request on GitHub. Now the owner of the repository is saying to squash all the commits into one.

When I type `git rebase -i` Notepad opens with the following content:

    noop

    # Rebase 0b13622..0b13622 onto 0b13622
    #
    # Commands:
    #  p, pick = use commit
    #  r, reword = use commit, but edit the commit message
    #  e, edit = use commit, but stop for amending
    #  s, squash = use commit, but meld into previous commit
    #  f, fixup = like &quot;squash&quot;, but discard this commit&#39;s log message
    #  x, exec = run command (the rest of the line) using shell
    #
    # These lines can be re-ordered; they are executed from top to bottom.
    #
    # If you remove a line here THAT COMMIT WILL BE LOST.
    #
    # However, if you remove everything, the rebase will be aborted.
    #
    # Note that empty commits are commented out

I searched on Google but I do not understand how to do this.

Squash all my commits into one for GitHub pull request

I recently updated my local Git installation to `1.8.1` from `1.8.0.1`.  

I&#39;m noticing that, when I work on GitHub, it doesn&#39;t prompt me for username and password on push anymore.  

This troubles me, as I see having to type user and password every time as a good security measure. (what if someone else uses my computer?)  

I checked the following:  

* `1.8.0.1` on another computer still asks for username and password.
* my account on github still enforces private/security controls.
* I am using https remote references, rather than ssh.
* For good measure, I checked in my `~/.ssh` fonder. Nothing wrong there.
* I&#39;m __not__ storing the login details in `~/.gitconfig` or individual `&lt;proj&gt;/.git/config` files.
* I&#39;m also __not__ storing anything github-related in `~/.netrc`.
* I created a new dummy archive: still doesn&#39;t prompt me for login.

I couldn&#39;t find anything in the git [release notes archive](https://github.com/git/git/tree/master/Documentation/RelNotes).  

Does anyone know if this is a new git behaviour? How do I restore the prompt?  


How can I force user and password prompt when pushing to my git repository?

This question seems like a duplicate but it&#39;s really not. Just a slight difference that keeps on repeating. git keeps on telling me: &quot;please tell me who you are&quot;, even after setting it up. when I run `git commit`, this is what I get....

    
    $ git commit

    *** Please tell me who you are.

    Run

    git config --global user.email &quot;you@example.com&quot;

    git config --global user.name &quot;Your Name&quot;

    to set your account&#39;s default identity.
    Omit --global to set the identity only in this repository.

    fatal: unable to auto-detect email address (got &#39;Obby@ObbyWorkstation.(none)&#39;)

But when I run `git config --global -l`, it gives me all my details...

    
    $ git config --global -l
    user.name=myname
    user.mail=me.myself@gmail.com
    http.proxy=proxy.XX.XX.XX:XXXX

I have changed my name, email and proxy but they are appearing fine when I run the command, even in the .gitconfig file I can see the values are set. what could be the missing thing, because I cannot commit at all. Every time it keeps asking me who I am ?

@sheu told me something that i changed, but still the same problem. when i set `--local`, still `git commit` asks me the same question. this is the output

    $ git config --local -l
    core.repositoryformatversion=0
    core.filemode=false
    core.bare=false
    core.logallrefupdates=true
    core.symlinks=false
    core.ignorecase=true
    core.hidedotfiles=dotGitOnly
    user.name=myname
    user.mail=me.myself@gmail.com



Why Git is not allowing me to commit even after configuration?

How do I create and/or send a pull request to another repository hosted on GitHub?

How to do a GitHub pull request

I generated an SSH key pair without a password and added the public key to GitHub.

Connection with

    user@dev:/var/www/project# ssh -T git@github.com
    Hi User! You&#39;ve successfully authenticated, but GitHub does not provide shell access.

was successful and when I rename the key, it fails.

But when I want to push my changes, it stills ask me for my username and password combination.

Is there a way to push without a password?



Push to GitHub without a password using ssh-key

I&#39;ve created a sample Asp.Net MVC 4 application where I&#39;ve used D3.js to append an SVG element and then inside the SVG I&#39;ve appended a text element (see code below).  This all works fine until I try to append an img to the SVG using a local png file.  The img gets appended to the DOM, but the img is not rendered on the page.  Any ideas what I&#39;m doing wrong here, and how to go about fixing it?

    @{
        ViewBag.Title = &quot;Home Page&quot;;
    }

    &lt;script src=&quot;~/Scripts/d3.v3.js&quot;&gt;&lt;/script&gt;
    &lt;script type=&quot;text/javascript&quot;&gt;
        var svg = d3.select(&quot;body&quot;)
            .append(&quot;svg&quot;)
            .attr(&quot;width&quot;, 200)
            .attr(&quot;height&quot;, 100)
            .style(&quot;border&quot;, &quot;1px solid black&quot;);
    			
        var text = svg.selectAll(&quot;text&quot;)
            .data([0])
            .enter()
            .append(&quot;text&quot;)
            .text(&quot;Testing&quot;)
            .attr(&quot;x&quot;, &quot;40&quot;)
            .attr(&quot;y&quot;, &quot;60&quot;);
    				
        var imgs = svg.selectAll(&quot;img&quot;).data([0]);
        imgs.enter()
            .append(&quot;img&quot;)
            .attr(&quot;xlink:href&quot;, &quot;@Url.Content(&quot;~/Content/images/icons/refresh.png&quot;)&quot;)
            .attr(&quot;x&quot;, &quot;60&quot;)
            .attr(&quot;y&quot;, &quot;60&quot;)
            .attr(&quot;width&quot;, &quot;20&quot;)
            .attr(&quot;height&quot;, &quot;20&quot;);
    
    &lt;/script&gt;

@Richard Marr - Below is an attempt to do the same thing in straight HTML, which gives me the same result.  I&#39;m not sure about my code to get the refresh.png file from the local drive this way.

    &lt;!DOCTYPE html&gt;
    &lt;html lang=&quot;en&quot;&gt;
    	&lt;head&gt;
    		&lt;meta charset=&quot;utf-8&quot;&gt;
    		&lt;script src=&quot;http://d3js.org/d3.v2.js&quot;&gt;&lt;/script&gt;
    
    	&lt;/head&gt;
    	&lt;body&gt;
    		&lt;script type=&quot;text/javascript&quot;&gt;
    			var svg = d3.select(&quot;body&quot;)
    				.append(&quot;svg&quot;)
    				.attr(&quot;width&quot;, 200)
    				.attr(&quot;height&quot;, 100)
    				.style(&quot;border&quot;, &quot;1px solid black&quot;);
    			
    			var text = svg.selectAll(&quot;text&quot;)
    				.data([0])
    				.enter()
    				.append(&quot;text&quot;)
    				.text(&quot;Testing&quot;)
    				.attr(&quot;x&quot;, &quot;40&quot;)
    				.attr(&quot;y&quot;, &quot;60&quot;);
    				
    			var imgs = svg.selectAll(&quot;img&quot;).data([0]);
    				imgs.enter()
                    .append(&quot;svg:img&quot;)
                    .attr(&quot;xlink:href&quot;, &quot;file:///D:/d3js_projects/refresh.png&quot;)
                    .attr(&quot;x&quot;, &quot;60&quot;)
                    .attr(&quot;y&quot;, &quot;60&quot;)
                    .attr(&quot;width&quot;, &quot;20&quot;)
                    .attr(&quot;height&quot;, &quot;20&quot;);
    
    		&lt;/script&gt;
    	&lt;/body&gt;
    &lt;/html&gt;

How to add an image to an svg container using D3.js

I&#39;d like to put a simple loading indicator on my website that&#39;s triggered by a script. It should be a simple circle arc that&#39;s got a gradient and is spinning while the user is waiting. I haven&#39;t tried the animation part, but got stuck on the static styling for now. Here&#39;s what I&#39;ve got so far:

    

&lt;!-- begin snippet: js hide: false console: false babel: false --&gt;

&lt;!-- language: lang-html --&gt;

    &lt;svg version=&quot;1.1&quot; baseProfile=&quot;full&quot; xmlns=&quot;http://www.w3.org/2000/svg&quot;
            width=&quot;100&quot; height=&quot;100&quot;&gt;
            &lt;defs&gt;
                &lt;linearGradient id=&quot;grad1&quot;&gt;
                    &lt;stop offset=&quot;0%&quot; stop-color=&quot;red&quot;/&gt;
                    &lt;stop offset=&quot;100%&quot; stop-color=&quot;red&quot; stop-opacity=&quot;0&quot; /&gt;
                &lt;/linearGradient&gt;
            &lt;/defs&gt;
            &lt;path d=&quot;M50 10  A40 40 0 1 0 90 50&quot;
                stroke=&quot;url(#grad1)&quot; stroke-width=&quot;10&quot; fill=&quot;transparent&quot;/&gt;
        &lt;/svg&gt;

&lt;!-- end snippet --&gt;

It draws the arc, from the top edge anti-clockwise to the right edge (270&#176;), but the gradient is wrong. Instead of following the path so that the beginning (top edge, 0&#176;) is opaque and the end (right edge, 270&#176;) is transparent, the resulting image of the arc stroke is coloured from left to right in screen space.

How can I make the gradient follow my arc path?

Can I apply a gradient along an SVG path?

I have an svg that includes images:

    &lt;g&gt;&lt;image id=&quot;myImage&quot; class=&quot;myClass&quot; x=&quot;12&quot; y=&quot;15&quot; width=&quot;10&quot; height=&quot;10&quot; xlink:href=&quot;/images/pic.png&quot;/&gt;&lt;/g&gt;

How do I replace that line w/ a font awesome icon:

    &lt;g&gt;&lt;i class=&quot;icon icon-cloud-download&quot; x=&quot;12&quot; y=&quot;15&quot; width=&quot;10&quot; height=&quot;10&quot;&gt;&lt;/i&gt;&lt;/g&gt;

doesn&#39;t seem to work as the image doesn&#39;t show up.


How do I include a font awesome icon in my svg?

I have following piece of code :

    &lt;svg&gt;
    
    &lt;defs&gt;
    &lt;rect id = &quot;myRect&quot;
          x = &quot;10&quot;
          y = &quot;10&quot;
          height = &quot;120&quot;
          width = &quot;120&quot;
          stroke-width = &quot;2px&quot;
          stroke = &quot;red&quot;
          fill = &quot;blue&quot; /&gt;
    
    &lt;/defs&gt;
    
    
    &lt;g transform = &quot;translate(100,30)&quot;&gt;
      &lt;use xlink:href = &quot;#myRect&quot; /&gt;
    &lt;/g&gt;
    
    &lt;g transform = &quot;translate(100, 100) rotate(45 ? ?)&quot;&gt;
    
      &lt;rect id = &quot;myRect&quot;
          x = &quot;10&quot;
          y = &quot;10&quot;
          height = &quot;120&quot;
          width = &quot;120&quot;
          stroke-width = &quot;2px&quot;
          stroke = &quot;green&quot;
          fill = &quot;yellow&quot; /&gt;
    &lt;/g&gt;
    
    &lt;/svg&gt;

When I translate rectangle without rotation, it is working fine. But when I rotate it, I wanted to rotate it around its center axis point. What should I need to pass to rotate attribute?

Rotate rectangle around its own center in SVG

I am learning svg from its official documents, there is such line. I don&#39;t get it, if it already has a `width` and `height` attribute, what is the point to specify it again in `viewBox=&quot;0 0 1500 1000&quot;` ? 
It is says, &quot;One px unit is defined to be equal to one user unit. Thus, a length of &quot;5px&quot; is the same as a length of &quot;5&quot;&quot; in the official docs, thus this viewBox is a 1500px wide and 1000 height view, which exceeds 300px and 200px. So why does it define the width and height value in the first place?  
   

     &lt;svg width=&quot;300px&quot; height=&quot;200px&quot; version=&quot;1.1&quot;
             viewBox=&quot;0 0 1500 1000&quot; preserveAspectRatio=&quot;none&quot;
             xmlns=&quot;http://www.w3.org/2000/svg&quot;&gt;

Content Type	Original Author	Original Content on Stackoverflow
Question	Alex Smolov	View Question on Stackoverflow
Solution 1 - Javascript	Ismael Ghalimi	View Answer on Stackoverflow
Solution 2 - Javascript	Tyler Hughes	View Answer on Stackoverflow

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