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POout of this world Comet programming and a web-based chat
 

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    <h2>Current Project Setup</h2> <p>I've been working on a web-based chat, similar to Facebook chat. At the current state, I listen for incoming chats and check for new messages in an existing chat is by doing...</p> <pre><code>setTimeout(function() { listenForIncomingChat() }, 500); setTimeout(function() { checkForIncomingMessages( ...params... ) }, 500); </code></pre> <p>... so doing the <code>setTimeout()</code> makes sure these functions are always running. Depending on how many chat windows I have open, Firebug's console can go crazy with <code>POST</code>s to the server :)</p> <p>Obviously this is really inefficient, but it is the only way I could get things to work. Now I'm looking for the ways to make it better, to do it correctly!</p> <h2>Some Research</h2> <p>Now, I have heard about <a href="http://en.wikipedia.org/wiki/Comet_%28programming%29" rel="nofollow noreferrer">Comet Programming</a> and that this is the way to open a long-lived HTTP connection with the server, but I'm not familiar with the technology or the ideas behind Comet. <a href="http://en.wikipedia.org/wiki/Web_Sockets" rel="nofollow noreferrer">WebSockets</a> for HTML5 is probably even better, but since that is not in full swing nor is it supported by all browsers, I'll stick with what works. </p> <p>According to Wikipedia, there are several ways to develop with the Comet style: Streaming (hidden iFrame, XMLHttpRequest) or AJAX with long polling (XMLHttpRequest, Script tag). However, I don't know anything about this. I've also read about the <a href="http://www.ape-project.org/" rel="nofollow noreferrer">AJAX Push Engine (APE)</a> and it looks cool, but I don't want to use a third-party for the time being.</p> <p>I've recently stumbled upon <a href="http://code.google.com/p/webchat2/" rel="nofollow noreferrer">WebChat 2.0</a> so I'm going to be looking through the source code to try and understand how it all works.</p> <h2><strong>On to the question(s)</strong></h2> <p>So where can I find example code/tutorials on how to get started with this kind of project? How would I implement the Comet technique? How do I set up the long-lived HTTP connection with the server? </p>
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    1. COI recommend you look at [now.js](http://nowjs.com/) It makes this stuff trivial and when used properly the abstraction isn't very expensive. It does require using node.js though but node was build for real time communication.
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    2. CO@Raynos... thanks for the suggestion. that is definitely one possibility. however, I was hoping to use PHP to handle the server-side; with node.js, wouldn't all server-side stuff be JavaScript?
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