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Comet Stream (gallery-comet-stream) on cdn

Last Updated: 02/24/11

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Morgan Cheng

YUI Contributor

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Created: 02/14/11
Last CDN Push: 02/23/11
Build Tag: gallery-2011.02.23-19-01
Project: YUI 3
License: YUI BSD
YUI Version: 3.3.0
Free for use.

This module is Comet Client (http://en.wikipedia.org/wiki/Comet_(programming)) to support [http://ajaxpatterns.org/HTTP_Streaming HTTP Streaming].

After HTTP stream is connected to server, data can be pushed to browser from server through the HTTP connection in real time.

The module build stream channel to server with XmlHttpRequest for all browsers except IE, since [http://blogs.msdn.com/b/ieinternals/archive/2010/04/06/comet-streaming-in-internet-explorer-with-xmlhttprequest-and-xdomainrequest.aspx XmlHttpRequest in IE6 and IE7 is not suitable for XHR Streaming]. For IE browsers, [http://cometdaily.com/2007/11/05/the-forever-frame-technique/ Forever IFraming technique] is used to support streaming.

For non-IE browsers, the server is supposed to respond with chunked HTTP response. Since browser doesn't expose chunked structure to us, the format is actually chunked-in-chunked.

For IE browsers, the server is supposed to respond with "text/html" content.



...1K padding...

<script type="text/javascript">

    parent.push("first message")

</script>

<script type="text/javascript">

    parent.push("second message")

</script>

Code Sample

<script src="http://yui.yahooapis.com/3.3.0/build/yui/yui-min.js"></script>

YUI({
    //Last Gallery Build of this module
    gallery: 'gallery-2011.02.23-19-01'
}).use('gallery-comet-stream', function(Y) {
    var streamUrl = "url-to-stream-source";
    var streamClient = new Y.CometStream({
        url: streamUrl,
        on: {
            pushed: function(data) {
                // data is pushed message as string
 
            }
        }
    });
    streamClient.start();
 
});

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