Difference between revisions of "HTML5WS"

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</pre>
 
</pre>
  
−
===js/websockets.js===
+
=== js/websockets.js ===
  
 
Because we are using the provided client-side Pusher library, we don't need to write too much JavaScript code... here it is!
 
Because we are using the provided client-side Pusher library, we don't need to write too much JavaScript code... here it is!
−
 
+
<pre>// Make connection when DOM has finished loading $(document).ready(ConnectToChat); //------------------------------------------------------------------------------ function ConnectToChat() { // Open connection $('#postit').prop('disabled', 'disabled'); $('#debugmessage').text('Connecting...'); var pusher = new Pusher('###GET YOUR OWN KEY!###'); // Check connection status pusher.connection.bind('connected', function() { $('#postit').removeProp('disabled'); $('#debugmessage').text('Connected!').fadeOut(2000); }); // Create channel var myChannel = pusher.subscribe('chat-channel'); // Bind event to function myChannel.bind('new-message', function(data) { $('#messages').append(data); $("#messages").prop({ scrollTop: $("#messages").prop("scrollHeight") }); }); // Bind enter key to post message $('#yourmessage').bind('keypress', function(e) { if(e.keyCode==13){ SendNewMessage(); } }); // Bind button click to post message $('#postit').click(SendNewMessage); } //------------------------------------------------------------------------------ function SendNewMessage() { // Read name and message from form var name = $('#yourname').val(); var message = $('#yourmessage').val(); var connecting = $('#postit').prop('disabled'); // Validate input if(name=='') name="Anonymous"; // Are we still connecting? if(connecting) exit; if(message!='') { // Clear message $('#yourmessage').val(''); // Send message to server $.ajax({ url: "http://mi-linux.wlv.ac.uk/~in9352/websockets/push-event.php", type: "POST", data: ({name&nbsp;: name, message&nbsp;: message}) }); } // Refocus on text input ready for next message $('#yourmessage').focus(); }</pre>  
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<pre>
+
When a user posts a message we use JQuery to sent an Ajax request to the push-event.php file... see below! and Change URL in code above!
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−
// Make connection when DOM has finished loading
 
−
$(document).ready(ConnectToChat);
 
−
 
 
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//------------------------------------------------------------------------------
 
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function ConnectToChat()
 
−
{
 
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  // Open connection  
 
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  $('#postit').prop('disabled', 'disabled');
 
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  $('#debugmessage').text('Connecting...');
 
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  var pusher = new Pusher('###GET YOUR OWN KEY!###');
 
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  // Check connection status
 
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  pusher.connection.bind('connected', function()
 
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  {
 
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    $('#postit').removeProp('disabled');
 
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    $('#debugmessage').text('Connected!').fadeOut(2000);
 
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  });
 
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  // Create channel
 
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  var myChannel = pusher.subscribe('chat-channel');  
 
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  // Bind event to function
 
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  myChannel.bind('new-message',  
 
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    function(data)  
 
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    {
 
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      $('#messages').append(data);
 
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      $("#messages").prop({ scrollTop: $("#messages").prop("scrollHeight") });
 
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    });
 
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    // Bind enter key to post message
 
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    $('#yourmessage').bind('keypress', function(e) {
 
−
            if(e.keyCode==13){
 
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                    SendNewMessage();
 
−
            }
 
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    });
 
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    // Bind button click to post message
 
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    $('#postit').click(SendNewMessage);
 
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}
 
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//------------------------------------------------------------------------------
 
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function SendNewMessage()
 
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{
 
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  // Read name and message from form      
 
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  var name = $('#yourname').val();
 
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  var message = $('#yourmessage').val();
 
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  var connecting = $('#postit').prop('disabled');
 
−
 
 
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  // Validate input
 
−
  if(name=='')
 
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    name="Anonymous";
 
−
 
 
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  // Are we still connecting?
 
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  if(connecting)
 
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    exit;
 
−
     
 
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  if(message!='')
 
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  {
 
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    // Clear message
 
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    $('#yourmessage').val('');
 
−
   
 
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    // Send message to server
 
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    $.ajax({
 
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      url: "http://mi-linux.wlv.ac.uk/~in9352/websockets/push-event.php",
 
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      type: "POST",
 
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      data: ({name : name, message : message})
 
−
      });
 
−
  }
 
−
   
 
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  // Refocus on text input ready for next message
 
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  $('#yourmessage').focus();
 
−
 
 
−
}
 
−
</pre>
 
−
 
 
−
When a user posts a message we use JQuery to sent an Ajax request to the push-event.php file... see below!
 
  
 
===push-event.php===
 
===push-event.php===

Revision as of 15:25, 26 February 2012

Main Page >> Advanced Web Technologies >> Workbook >> Week 05 - HTML5 Web Sockets

HTML5 Web Sockets

This page features the full code of the following webpage: http://mi-linux.wlv.ac.uk/~in9352/websockets/

In order to avoid having to set-up a web socket service on the server, we are using this free, cloud-based web socket API:

The free Sandbox plan includes up to 20 connections and 100,000 messages per day. Both client-side and server-side libraries are provided, so we won't need to write much code at all!

index.html

The webpage itself is using the brand new HTML5 Document type, as well as a couple of HTML5 new features:

  • New semantic elements, e,g, header, section, footer
  • New placeholder attribute for the text boxes

It links to a simple stylesheet (see code further down), as well as 3 JavaScript files:

  • pusher.js - the client-side library to access the cloud-based Web Socket API
  • jquery-1.6.2.min.js - to facilitate DOM manipulation and Ajax requests - get latest version here.
  • websockets.js - our own JavaScript code (we still need to write some!)
<!DOCTYPE HTML>
<html>
  <head>
    <title>Share a happy thought</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    
    <link rel="stylesheet" type="text/css" href="css/style.css" />
    <script src="http://js.pusherapp.com/1.9/pusher.js"></script>
    <script src="js/jquery-1.6.2.min.js"></script>
    <script src="js/websockets.js"></script>
  </head>
  <body>
    <header>
      <h1>Share a happy thought</h1>
      <p>An idea, a saying, a funny quote, a link... anything!</p>
    </header>
    <section id="new-message">
      <form>
        <input type="text" id="yourname" placeholder="Your name">
        <input type="text" id="yourmessage" placeholder="Your happy thought">
        <input type="button" id="postit" value="Post">
        <span id="debugmessage"></span>
      </form>
    </section>
    <section id="messages"></section>
    <footer>
      Powered by 
      <a href="http://www.html5rocks.com/en/">HTML5</a>, 
      <a href="http://dev.w3.org/html5/websockets/">Web Sockets</a>, 
      <a href="http://pusher.com/">Pusher</a>, 
      <a href="http://jquery.com/">JQuery</a> and 
      <a href="http://www.css3.info/">CSS3</a>. 
      Copyright 2011 by Alix Bergeret. All Rights Reserved.
    </footer>
  </body>
</html>

css/style.css

Nothing major here, aside from some nice CSS3 effects! 

@font-face 
{
  font-family: alix;
  src: url('../fonts/Bubblegum.ttf');
}

a, a.visited, p, header,footer, input, span  
{
  font-family: Arial
}

body
{
  background-color: #E0E0E0
}

a, a.visited
{
  color: #FFBF00;
}

span#debugmessage
{
  font-size: small
}

header,footer    
{
  background-color: #4F4FD9;
  text-align: center;
  padding: 10px;
  margin: 10px;
  color: #FFBF00;
  
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  border-radius: 10px;  
  
  -webkit-box-shadow: 5px 5px 5px 0px #000000;
  -moz-box-shadow: 5px 5px 5px 0px #000000;
  box-shadow: 5px 5px 5px 0px #000000;  
  
  
  background: rgb(115,115,217); /* Old browsers */
  background: -moz-linear-gradient(left, rgba(115,115,217,1) 0%, rgba(79,79,217,1) 100%); /* FF3.6+ */
  background: -webkit-gradient(linear, left top, right top, color-stop(0%,rgba(115,115,217,1)), color-stop(100%,rgba(79,79,217,1))); /* Chrome,Safari4+ */
  background: -webkit-linear-gradient(left, rgba(115,115,217,1) 0%,rgba(79,79,217,1) 100%); /* Chrome10+,Safari5.1+ */
  background: -o-linear-gradient(left, rgba(115,115,217,1) 0%,rgba(79,79,217,1) 100%); /* Opera11.10+ */
  background: -ms-linear-gradient(left, rgba(115,115,217,1) 0%,rgba(79,79,217,1) 100%); /* IE10+ */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#7373d9', endColorstr='#4f4fd9',GradientType=1 ); /* IE6-9 */
  background: linear-gradient(left, rgba(115,115,217,1) 0%,rgba(79,79,217,1) 100%); /* W3C */
  
}

header
{
  font-family: alix;
  font-size: x-large;
  text-shadow: 3px 3px 3px #000000;
  filter: dropshadow(color=#000000, offx=3, offy=3);
}

footer
{
  font-size: small;
}

p
{
font-size: large;
}

#new-message
{
  margin: 10px 20px 5px 20px
}
#yourmessage
{
  width: 300px
}

#messages
{
  height: 200px;
  background-color: #ffffff;
  overflow-y: scroll;
  overflow-x: hidden;
  margin: 10px;
  padding: 10px;
  border: 1px black solid;
  
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  border-radius: 10px;    
}

js/websockets.js

Because we are using the provided client-side Pusher library, we don't need to write too much JavaScript code... here it is! 

// Make connection when DOM has finished loading $(document).ready(ConnectToChat); //------------------------------------------------------------------------------ function ConnectToChat() { // Open connection $('#postit').prop('disabled', 'disabled'); $('#debugmessage').text('Connecting...'); var pusher = new Pusher('###GET YOUR OWN KEY!###'); // Check connection status pusher.connection.bind('connected', function() { $('#postit').removeProp('disabled'); $('#debugmessage').text('Connected!').fadeOut(2000); }); // Create channel var myChannel = pusher.subscribe('chat-channel'); // Bind event to function myChannel.bind('new-message', function(data) { $('#messages').append(data); $("#messages").prop({ scrollTop: $("#messages").prop("scrollHeight") }); }); // Bind enter key to post message $('#yourmessage').bind('keypress', function(e) { if(e.keyCode==13){ SendNewMessage(); } }); // Bind button click to post message $('#postit').click(SendNewMessage); } //------------------------------------------------------------------------------ function SendNewMessage() { // Read name and message from form var name = $('#yourname').val(); var message = $('#yourmessage').val(); var connecting = $('#postit').prop('disabled'); // Validate input if(name=='') name="Anonymous"; // Are we still connecting? if(connecting) exit; if(message!='') { // Clear message $('#yourmessage').val(''); // Send message to server $.ajax({ url: "http://mi-linux.wlv.ac.uk/~in9352/websockets/push-event.php", type: "POST", data: ({name : name, message : message}) }); } // Refocus on text input ready for next message $('#yourmessage').focus(); }

When a user posts a message we use JQuery to sent an Ajax request to the push-event.php file... see below! and Change URL in code above!

push-event.php

This time we are using the provided server-side Pusher library (Pusher.php), so again not too much for us to do! 

<?php

  require('Pusher.php');
  
  // Read and clean user input
  $message = CleanInput($_POST['message']);
  $name = CleanInput($_POST['name']);
  
  // My Pusher credentials, get your own!
  $key = '###GET YOUR OWN KEY!###';
  $secret = '###GET YOUR OWN KEY!###';
  $app_id  = '###GET YOUR OWN KEY!###';
  
  // Create pusher object
  $pusher = new Pusher($key, $secret, $app_id);
  
  // Trigger new-message event, which will be sent to all clients
  $pusher->trigger('chat-channel', 'new-message', $name.' says: '.$message.'<br />');

//------------------------------------------------------------------------------
function CleanInput($text) 
{
  $text = stripslashes($text);
  $text = htmlentities($text);
  $text = preg_replace('/https?:\/\/[^\s<]+/i', '<a href="\0">\0</a>', $text);
  
  return $text;
}
?>
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