src/cm/media/js/lib/yui/yui_3.0.0b1/examples/io/io-xdr.html
author Yves-Marie Haussonne <ymh.work+github@gmail.com>
Fri, 09 May 2014 18:35:26 +0200
changeset 656 a84519031134
parent 0 40c8f766c9b8
permissions -rw-r--r--
add link to "privacy policy" in the header test
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<head>
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	<title>YUI Library Examples: IO: Cross-Domain JSON Transaction &mdash; Retrieving a News Feed from Yahoo! Pipes</title>
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    <meta http-equiv="content-type" content="text/html; charset=utf-8">
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    	<link rel="stylesheet" type="text/css" href="../../assets/yui.css" >
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<style>
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    /*Supplemental CSS for the YUI distribution*/
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    #custom-doc { width: 95%; min-width: 950px; }
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    #pagetitle {background-image: url(../../assets/bg_hd.gif);}
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/*    #pagetitle h1 {background-image: url(../../assets/title_h_bg.gif);}*/
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</style>
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<link rel="stylesheet" type="text/css" href="../../assets/dpSyntaxHighlighter.css">
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<link type="text/css" rel="stylesheet" href="../../build/cssfonts/fonts-min.css" />
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<script type="text/javascript" src="../../build/yui/yui-min.js"></script>
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<style type="text/css">
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#output li {margin-left:2em;}
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#output { background-color:#FFFFFF; border:1px dotted #666666; padding:1em; margin-top:1em;}
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</style>
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</head>
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<body id="yahoo-com" class=" yui-skin-sam">
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<div id="custom-doc" class="yui-t2">
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<div id="hd">
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	<div id="ygunav">
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		<p>
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            <em>
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                <a href="http://developer.yahoo.com/yui/3/">YUI 3.x Home</a> <i> - </i>	
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            </em>
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		</p>
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		<form action="http://search.yahoo.com/search" id="sitesearchform">
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            <input name="vs" type="hidden" value="developer.yahoo.com">
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            <input name="vs" type="hidden" value="yuiblog.com">
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		    <div id="sitesearch">
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		    	<label for="searchinput">Site Search (YDN &amp; YUIBlog): </label>
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			    <input type="text" id="searchinput" name="p">
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			    <input type="submit" value="Search" id="searchsubmit" class="ygbt">
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		    </div>
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		</form>
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    </div>
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	<div id="ygma"><a href="../../"><img src="../../assets/logo.gif"  border="0" width="200" height="93"></a></div>
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	<div id="pagetitle"><h1>YUI Library Examples: IO: Cross-Domain JSON Transaction &mdash; Retrieving a News Feed from Yahoo! Pipes</h1></div>
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</div>
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<div id="bd">
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	<div id="bar-note"><p><strong>Note:</strong> This is YUI 3.x. Looking for <a href="http://developer.yahoo.com/yui/">YUI 2.x</a>?</p></div>
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	<div id="yui-main">
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		<div class="yui-b">
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		  <div class="yui-ge">
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			  <div class="yui-u first example" id="main">
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	<h2>IO: Cross-Domain JSON Transaction &mdash; Retrieving a News Feed from Yahoo! Pipes</h2>
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	<div id="example" class="promo">
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	<p>
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	<p>In the example below, IO is employed to make a cross-domain request to <a href="http://pipes.yahoo.com">Yahoo! Pipes</a>.  The output of the Pipe is an RSS-style feed formatted as JSON.  We pass that output to the JSON Utility's <code>parse</code> method for sanitization and then display the contents of the Pipe in a list.</p>
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<p>The cross-domain approach obviates the need for a server-side proxy, making it faster. And the use of IO in place of a script node allows us to retrieve the JSON data as a string and execute <code>JSON.parse</code> against it, making it safer to use; a script node would evaluate immediately in the global scope as soon as it was loaded.</p>	</p>	
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	<div class="module example-container ">
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			<div class="hd exampleHd">
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			<p class="newWindowButton yui-skin-sam">
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                <a href="io-xdr_clean.html" target="_blank">View example in new window.</a>
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            </p>
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		</div>		<div id="example-canvas" class="bd">
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	<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
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	<button id="fetch" disabled="disabled">Load JSON RSS news feed from Yahoo! Pipes.</button>
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<div id="output">
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	<ul>
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		<li>Content from Yahoo! Pipes feed will display here.</li>
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    </ul>
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</div>
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<script language="javascript">
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YUI({base:"../../build/", timeout: 10000}).use("io", "substitute", "json-parse",
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	function(Y) {
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		//Data fetched will be displayed in a UL in the
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		//element #output:
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		var output = Y.Node.get("#output ul");
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		//Configure the cross-domain protocol:
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		var xdrConfig = {
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			id:'flash', //We'll reference this id in the xdr configuration of our transaction.
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			yid: Y.id,  //The yid provides a link from the Flash-based XDR engine
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						//and the YUI instance.
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			src:'../../build/io/io.swf?t=' + new Date().valueOf().toString() //Relative path to the .swf file from the current page.
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		};
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		Y.io.transport(xdrConfig);
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		//Event handler called when the transaction begins:
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		var handleStart = function(id, a) {
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			Y.log("io:start firing.", "info", "example");
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			output.set("innerHTML", "<li>Loading news stories via Yahoo! Pipes feed...</li>");
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		}
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		//Event handler for the success event -- use this handler to write the fetched
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		//RSS items to the page.
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		var handleSuccess = function(id, o, a) {
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			//We use JSON.parse to sanitize the JSON (as opposed to simply eval'ing
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			//it into the page):
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			var oRSS = Y.JSON.parse(o.responseText);
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			//From here, we simply access the JSON data from where it's provided
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			//in the Yahoo! Pipes output:
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			if (oRSS && oRSS.count) {
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				var s = "<!--begin news stories fetched via Yahoo! Pipes-->",
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					//t in this case is our simple template; this is fed to
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					//Y.Lang.substitute as we loop through RSS items:
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					t = "<li><a href='{link}'>{title}</a>, {pubDate}</li>";
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				for (var i=0; i<oRSS.count; i++) {
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					s += Y.Lang.substitute(t, oRSS.value.items[i]);
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				}
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				//Output the string to the page:
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				output.set("innerHTML", s);
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				output.addClass("yui-null");
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			} else {
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				//No news stories were found in the feed.
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				var s = "<li>The RSS feed did not return any items.</li>";
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			}
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		}
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		//In the event that the HTTP status returned is > 399, a
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		//failure is reported and this function is called:
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		var handleFailure = function(id, o, a) {
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			Y.log("ERROR " + id + " " + a, "info", "example");
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		}
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		//With all the aparatus in place, we can now configure our
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		//io call.
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		var cfg = {
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			method: "GET",
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			xdr: {
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				use:'flash' //This is the xdrConfig id we referenced above.
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			},
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			on: {
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				//Our event handlers previously defined:
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				start: handleStart,
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				success: handleSuccess,
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				failure: handleFailure
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			}
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		};
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		//Wire the buttton to a click handler to fire our request each
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		//time the button is clicked:
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		var handleClick = function(o) {
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			Y.log("Click detected; beginning io request to Yahoo! Pipes.", "info", "example");
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			var obj = Y.io(
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				//this is a specific Pipes feed, populated with cycling news:
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				"http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json",
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				cfg
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			);
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		}
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		//add the clickHandler as soon as the xdr Flash module has
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		//loaded:
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		Y.on('io:xdrReady', function() {
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			var fetch = Y.Node.get("#fetch");
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			fetch.set("disabled", false);
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			Y.on("click", handleClick, fetch);
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		});
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	}
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);
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</script>	
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	<!--END SOURCE CODE FOR EXAMPLE =============================== -->
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		</div>
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	</div>			
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	</div>
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	<h2 class="first">Implementing a Simple Cross-Domain Request for JSON Data</h2>
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<p>In this example, we begin with a YUI instance that loads the IO and JSON modules:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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//Create a YUI instance including support for IO and JSON modules:
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YUI({base:"../../build/", timeout: 10000}).use("io-xdr", "substitute", "json-parse", function(Y) {
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	// Y is the YUI instance.
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	// The rest of the following code is encapsulated in this
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	// anonymous function.
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} );
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</textarea>
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<p>We'll also get a Node reference to the container we'll be using to output the data we retrieve:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">//Data fetched will be displayed in a UL in the
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//element #output:
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var output = Y.Node.get("#output ul");</textarea>
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<p>Next, we configure IO's cross-domain interface for this YUI instance.  Flash is the underlying mechansim used here.  Be sure to configure the <code>src</code> property to point to your <code>IO.swf</code> file.</p>
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<textarea name="code" class="JScript" cols="60" rows="1">//Configure the cross-domain protocol:
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var xdrConfig = {
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    id:'flash', //We'll reference this id in the xdr configuration of our transaction.
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    yid: Y.id,  //The yid provides a link from the Flash-based XDR engine
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                //and the YUI instance.
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    src:'../../build/io/IO.swf?t=' + new Date().valueOf().toString() //Relative path to the .swf file from the current page.
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};
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Y.io.transport(xdrConfig);</textarea>
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<p>The configuration for our specific IO transaction contains a reference to the <code>xdr</code> configuration we created above and specifies that there will not be a need to process the response as XML (we're getting JSON instead):</p>
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<textarea name="code" class="JScript" cols="60" rows="1">var cfg = {
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    method: "GET",
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    xdr: {
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        use:'flash', //This is the xdrConfig id we referenced above.
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        responseXML:false //we're using JSON -- marginally faster, and
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                          //supported by the Pipes API
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    },
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    on: {
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        //Our event handlers previously defined:
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        start: handleStart,
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        success: handleSuccess,
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        failure: handleFailure
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    }
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};</textarea>
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<p>The final step is to make the request:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">var obj = Y.io(
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    //this is a specific Pipes feed, populated with cycling news:
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    "http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json",
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    cfg
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);</textarea>
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<h3>Full Script</h3>
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<p>The full script source for this example is as follows:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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YUI({base:"../../build/", timeout: 10000}).use("io-xdr", "substitute", "json-parse",
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	function(Y) {
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		//Data fetched will be displayed in a UL in the
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		//element #output:
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		var output = Y.Node.get("#output ul");
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		//Configure the cross-domain protocol:
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		var xdrConfig = {
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			id:'flash', //We'll reference this id in the xdr configuration of our transaction.
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			yid: Y.id,  //The yid provides a link from the Flash-based XDR engine
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						//and the YUI instance.
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			src:'../../build/io/IO.swf' //Relative path to the .swf file from the current page.
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		};
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		Y.io.transport(xdrConfig);
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		//Event handler called when the transaction begins:
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		var handleStart = function(id, a) {
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			Y.log("io:start firing.", "info", "example");
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			output.set("innerHTML", "<li>Loading news stories via Yahoo! Pipes feed...</li>");
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		}
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		//Event handler for the success event -- use this handler to write the fetched
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		//RSS items to the page.
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		var handleSuccess = function(id, o, a) {
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			//We use JSON.parse to sanitize the JSON (as opposed to simply eval'ing
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			//it into the page):
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			var oRSS = Y.JSON.parse(o.responseText);
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			//From here, we simply access the JSON data from where it's provided
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			//in the Yahoo! Pipes output:
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			if (oRSS && oRSS.count) {
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				var s = "<!--begin news stories fetched via Yahoo! Pipes-->",
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					//t in this case is our simple template; this is fed to
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					//Y.Lang.substitute as we loop through RSS items:
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					t = "<li><a href='{link}'>{title}</a>, {pubDate}</li>";
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				for (var i=0; i<oRSS.count; i++) {
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					s += Y.Lang.substitute(t, oRSS.value.items[i]);
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				}
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				//Output the string to the page:
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				output.set("innerHTML", s);
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			} else {
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				//No news stories were found in the feed.
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				var s = "<li>The RSS feed did not return any items.</li>";
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			}
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		}
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		//In the event that the HTTP status returned is > 399, a
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		//failure is reported and this function is called:
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		var handleFailure = function(id, o, a) {
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			Y.log("ERROR " + id + " " + a, "info", "example");
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		}
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		//With all the aparatus in place, we can now configure our
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		//io call.
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		var cfg = {
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			method: "GET",
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			xdr: {
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				use:'flash', //This is the xdrConfig id we referenced above.
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				responseXML:false //we're using JSON -- marginally faster, and
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								  //supported by the Pipes API
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			},
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			on: {
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				//Our event handlers previously defined:
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				start: handleStart,
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				success: handleSuccess,
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				failure: handleFailure
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			}
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		};
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		//Wire the buttton to a click handler to fire our request each
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		//time the button is clicked:
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		var handleClick = function(o) {
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			Y.log("Click detected; beginning io request to Yahoo! Pipes.", "info", "example");
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			var obj = Y.io(
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				//this is a specific Pipes feed, populated with cycling news:
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				"http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json",
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				cfg
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			);
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		}
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		//add the clickHandler as soon as the xdr Flash module has
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		//loaded:
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		Y.on('io:xdrReady', function() {
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			var fetch = Y.Node.get("#fetch");
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			fetch.set("disabled", false);
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			Y.on("click", handleClick, fetch);
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		});
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	}
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);
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</textarea>				</div>
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				<div class="yui-u sidebar">
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					<div id="examples" class="mod box4">
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                        <div class="hd">
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						<h4>
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    IO Examples:</h4>
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                        </div>
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						<div class="bd">
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							<ul>
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								<li><a href='../io/io-get.html'>GET Transaction</a></li><li><a href='../io/io-post.html'>POST Transaction</a></li><li><a href='../io/io-weather.html'>XML Transaction &mdash; Retrieving a Yahoo! Weather RSS (XML) Feed via a Server-Side Proxy</a></li><li class='selected'><a href='../io/io-xdr.html'>Cross-Domain JSON Transaction &mdash; Retrieving a News Feed from Yahoo! Pipes</a></li><li><a href='../node-menunav/node-menunav-8.html'>Adding Submenus On The Fly (included with examples for MenuNav Node Plugin)</a></li><li><a href='../overlay/overlay-io-plugin.html'>IO Plugin (included with examples for Overlay)</a></li><li><a href='../dd/portal-drag.html'>Portal Style Example (included with examples for Drag &amp; Drop)</a></li>							</ul>
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						</div>
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					</div>
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					<div class="mod box4">
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                        <div class="hd">
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						<h4>More IO Resources:</h4>
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                        </div>
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                        <div class="bd">
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						<ul>
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							<!-- <li><a href="http://developer.yahoo.com/yui/io/">User's Guide</a> (external)</li> -->
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						<li><a href="../../api/module_io.html">API Documentation</a></li>
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</ul>
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                        </div>
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					</div>
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			  </div>
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		</div>
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		</div>
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	</div>
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<div class="yui-b toc3" id="tocWrapper">
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<!-- TABLE OF CONTENTS -->
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<div id="toc">
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<ul>
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<li class="sect first">YUI 3.x Project</li><li class="item"><a title="The Yahoo! User Interface (YUI) Library, 3.x Branch, " href="http://developer.yahoo.com/yui/3/">YUI 3 Web Site (external)</a></li><li class="item"><a title="Examples of every YUI utility and control in action" href="../../examples/">YUI 3 Examples</a></li><li class="item"><a title="Instantly searchable API documentation for the entire YUI library." href="../../api/">YUI 3 API Docs</a></li><li class="item"><a title="The YUI Library can be downloaded from SourceForge" href="http://sourceforge.net/projects/yui/">YUI 3 on Sourceforge (external)</a></li><li class="item"><a title="YUI is free and open, offered under a BSD license." href="http://developer.yahoo.com/yui/3/license.html">YUI License (external)</a></li><li class="sect">YUI 3 Core - Examples</li><li class="item"><a title="YUI (Global Prerequisite) - Functional Examples" href="../../examples/yui/index.html">YUI (Global Prerequisite)</a></li><li class="item"><a title="Event - Functional Examples" href="../../examples/event/index.html">Event</a></li><li class="item"><a title="Node - Functional Examples" href="../../examples/node/index.html">Node</a></li><li class="sect">YUI 3 Component Infrastructure - Examples</li><li class="item"><a title="Attribute - Functional Examples" href="../../examples/attribute/index.html">Attribute</a></li><li class="item"><a title="Plugin - Functional Examples" href="../../examples/plugin/index.html">Plugin</a></li><li class="item"><a title="Widget - Functional Examples" href="../../examples/widget/index.html">Widget</a></li><li class="sect">YUI 3 Utilities - Examples</li><li class="item"><a title="Animation - Functional Examples" href="../../examples/anim/index.html">Animation</a></li><li class="item"><a title="Cache - Functional Examples" href="../../examples/cache/index.html">Cache</a></li><li class="item"><a title="Cookie - Functional Examples" href="../../examples/cookie/index.html">Cookie</a></li><li class="item"><a title="DataSchema - Functional Examples" href="../../examples/dataschema/index.html">DataSchema</a></li><li class="item"><a title="DataSource - Functional Examples" href="../../examples/datasource/index.html">DataSource</a></li><li class="item"><a title="DataType - Functional Examples" href="../../examples/datatype/index.html">DataType</a></li><li class="item"><a title="Drag &amp; Drop - Functional Examples" href="../../examples/dd/index.html">Drag &amp; Drop</a></li><li class="item"><a title="Get - Functional Examples" href="../../examples/get/index.html">Get</a></li><li class="item"><a title="History - Functional Examples" href="../../examples/history/index.html">History</a></li><li class="item"><a title="ImageLoader - Functional Examples" href="../../examples/imageloader/index.html">ImageLoader</a></li><li class="selected "><a title="IO - Functional Examples" href="../../examples/io/index.html">IO</a></li><li class="item"><a title="JSON (JavaScript Object Notation) - Functional Examples" href="../../examples/json/index.html">JSON</a></li><li class="item"><a title="Queue - Functional Examples" href="../../examples/queue/index.html">Queue</a></li><li class="item"><a title="Stylesheet - Functional Examples" href="../../examples/stylesheet/index.html">Stylesheet</a></li><li class="sect">YUI 3 Widgets - Examples</li><li class="item"><a title="Overlay - Functional Examples" href="../../examples/overlay/index.html">Overlay</a></li><li class="item"><a title="Slider - Functional Examples" href="../../examples/slider/index.html">Slider</a></li><li class="sect">YUI 3 Node Plugins - Examples</li><li class="item"><a title="FocusManager Node Plugin - Functional Examples" href="../../examples/node-focusmanager/index.html">FocusManager Node Plugin</a></li><li class="item"><a title="MenuNav Node Plugin - Functional Examples" href="../../examples/node-menunav/index.html">MenuNav Node Plugin</a></li><li class="sect">YUI 3 CSS - Examples</li><li class="item"><a title="YUI CSS Reset - Functional Examples" href="../../examples/cssreset/index.html">CSS Reset</a></li><li class="item"><a title="YUI Fonts - Functional Examples" href="../../examples/cssfonts/index.html">CSS Fonts</a></li><li class="item"><a title="YUI Base - Functional Examples" href="../../examples/cssbase/index.html">CSS Base</a></li><li class="sect">YUI 3 Developer Tools - Examples</li><li class="item"><a title="Console - Functional Examples" href="../../examples/console/index.html">Console</a></li><li class="item"><a title="Profiler - Functional Examples" href="../../examples/profiler/index.html">Profiler</a></li><li class="item"><a title="Test - Functional Examples" href="../../examples/test/index.html">Test</a></li><li class="sect">The YUI Community</li><li class="item"><a title="The Yahoo! User Interface Blog" href="http://yuiblog.com">YUI Blog (external)</a></li><li class="item"><a title="The Yahoo! Group YDN-JavaScript hosts the YUI community forum" href="http://tech.groups.yahoo.com/group/ydn-javascript/">YUI Forum (external)</a></li><li class="item"><a title="The Yahoo! Group yui3 is dedicated to the 3.x branch of the Yahoo! User Interface (YUI) Library." href="http://tech.groups.yahoo.com/group/yui3/">YUI 3 Forum (external)</a></li><li class="item"><a title="YUI is used by Yahoo! and by hundreds of other sites, including many you know and love." href="/yui/poweredby/">YUI Sightings (external)</a></li><li class="item"><a title="Videos and podcasts from the YUI Team and from the Yahoo! frontend engineering community." href="http://developer.yahoo.com/yui/theater/">YUI Theater (external)</a></li><li class="sect">YUI Articles on the YUI Website</li><li class="item"><a title="Answers to Frequently Asked Questions about the YUI Library" href="http://developer.yahoo.com/yui/articles/faq/">YUI FAQ (external)</a></li><li class="item"><a title="Yahoo!'s philosophy of Graded Browser Support" href="http://developer.yahoo.com/yui/articles/gbs/">Graded Browser Support (external)</a></li><li class="item"><a title="Reporting Bugs and Making Feature Requests for YUI Components" href="http://developer.yahoo.com/yui/articles/reportingbugs/">Bug Reports/Feature Requests (external)</a></li><li class="item"><a title="Serve YUI source files from Yahoo! -- free, fast, and simple" href="http://developer.yahoo.com/yui/3/articles/hosting/">Serving YUI Files from Yahoo! (external)</a></li></ul>
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</div>
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</div>
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	</div><!--closes bd-->
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	<div id="ft">
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        <p class="first">Copyright &copy; 2009 Yahoo! Inc. All rights reserved.</p>
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        <p><a href="http://privacy.yahoo.com/privacy/us/devel/index.html">Privacy Policy</a> - 
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            <a href="http://docs.yahoo.com/info/terms/">Terms of Service</a> - 
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            <a href="http://docs.yahoo.com/info/copyright/copyright.html">Copyright Policy</a> - 
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            <a href="http://careers.yahoo.com/">Job Openings</a></p>
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	</div>
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</div>
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<script src="../../assets/dpSyntaxHighlighter.js"></script>
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<script language="javascript"> 
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dp.SyntaxHighlighter.HighlightAll('code'); 
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</script>
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</body>
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</html>