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<title>YUI Library Examples: YUI Test Utility: Asynchronous Testing</title>
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<p><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></p>
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<div id="ygma"><a href="../../"><img src="../../assets/yui.gif" border="0" height="38"></a></div>
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<div id="pagetitle"><h1>YUI Library Examples: YUI Test Utility: Asynchronous Testing</h1></div>
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</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">
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<div class="promo">
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<h1>YUI Test Utility: Asynchronous Testing</h1>
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<div class="exampleIntro">
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<p>This example shows how to create an asynchronous test with the YUI Test framework for testing browser-based JavaScript code.
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A <a href="/yui/yuitest/#testcase"><code>TestCase</code></a> object is created with a test that waits for a
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few seconds before continuing. The <a href="/yui/yuitest/#testrunner"><code>TestRunner</code></a>
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is then used to run the tests once the page has loaded.</p>
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</div>
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<div class="example-container module ">
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<div class="hd exampleHd">
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<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="yt-async-test_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->
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</div> <div id="example-canvas" class="bd">
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<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
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<div id="testLogger"></div>
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<script type="text/javascript">
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YAHOO.namespace("example.yuitest");
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YAHOO.example.yuitest.AsyncTestCase = new YAHOO.tool.TestCase({
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//name of the test case - if not provided, one is auto-generated
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name : "Asynchronous Tests",
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//---------------------------------------------------------------------
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// setUp and tearDown methods - optional
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//---------------------------------------------------------------------
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/*
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* Sets up data that is needed by each test.
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*/
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setUp : function () {
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this.data = {
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name: "yuitest",
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year: 2007,
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beta: true
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};
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},
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/*
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* Cleans up everything that was created by setUp().
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*/
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tearDown : function () {
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delete this.data;
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},
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//---------------------------------------------------------------------
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// Test methods - names must begin with "test"
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//---------------------------------------------------------------------
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testWait : function (){
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var Assert = YAHOO.util.Assert;
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//do some assertions now
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Assert.isTrue(this.data.beta);
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Assert.isNumber(this.data.year);
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//wait five seconds and do some more
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this.wait(function(){
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Assert.isString(this.data.name);
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}, 5000);
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}
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});
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YAHOO.util.Event.onDOMReady(function (){
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//create the logger
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var logger = new YAHOO.tool.TestLogger("testLogger");
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YAHOO.tool.TestRunner.add(YAHOO.example.yuitest.AsyncTestCase);
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//run the tests
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YAHOO.tool.TestRunner.run();
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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">Asynchronous Test Example</h2>
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<p>This example begins by creating a namespace:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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YAHOO.namespace("example.yuitest");
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</textarea>
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<p>This namespace serves as the core object upon which others will be added (to prevent creating global objects).</p>
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<h3>Creating the TestCase</h3>
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<p>The first step is to create a new <a href="/yui/yuitest/#testcase"><code>TestCase</code></a> object called <code>AsyncTestCase</code>.
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To do so, using the <code>TestCase</code> constructor and pass in an object literal containing information about the tests to be run:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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YAHOO.example.yuitest.AsyncTestCase = new YAHOO.tool.TestCase({
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//name of the test case - if not provided, one is auto-generated
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name : "Asynchronous Tests",
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//---------------------------------------------------------------------
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// setUp and tearDown methods - optional
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//---------------------------------------------------------------------
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/*
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* Sets up data that is needed by each test.
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*/
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setUp : function () {
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this.data = {
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name: "yuitest",
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year: 2007,
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beta: true
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};
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},
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/*
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* Cleans up everything that was created by setUp().
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*/
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tearDown : function () {
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delete this.data;
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},
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//---------------------------------------------------------------------
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// Test methods - names must begin with "test"
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//---------------------------------------------------------------------
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testWait : function (){
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var Assert = YAHOO.util.Assert;
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//do some assertions now
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Assert.isTrue(this.data.beta);
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Assert.isNumber(this.data.year);
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//wait five seconds and do some more
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this.wait(function(){
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Assert.isString(this.data.name);
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}, 5000);
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}
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});
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</textarea>
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<p>The object literal passed into the constructor contains two different sections. The first section contains the <code>name</code> property,
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which is used to determine which <code>TestCase</code> is being executed. A name is necessary, so one is generated if it isn't specified.</p>
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<p>Next, the <code>setUp()</code> and <code>tearDown()</code> methods are included. The <code>setUp()</code> method is used in a <code>TestCase</code>
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to set up data that may be needed for tests to be completed. This method is called immediately before each test is executed. For this example,
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<code>setUp()</code> creates a data object. The <code>tearDown()</code> is responsible for undoing what was done in <code>setUp()</code>. It is
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run immediately after each test is run and, in this case, deletes the data object that was created by <code>setUp</code>. These methods are optional.</p>
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<p>The second section contains the actual tests to be run. The only test is <code>testWait()</code>, which demonstrates using
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the <code>wait()</code> method to delay test execution. There are two arguments passed in: a function to run once the test resumes
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and the number of milliseconds to wait before running this function (same basic format as <code>setTimeout()</code>). When
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the test resumes, the function is executed in the context of the <code>TestCase</code> object, meaning that it still has
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access to all of the same data as the test that called <code>wait()</code>, including properties and methods on the <code>TestCase</code>
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itself. This example shows the anonymous function using both the <code>Assert</code> object and the <code>data</code> property
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of the <code>TestCase</code>.</p>
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<h3>Running the tests</h3>
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<p>With all of the tests defined, the last step is to run them. This initialization is assigned to take place when the document tree has been
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completely loaded by using the Event utility's <code>onDOMReady()</code> method:</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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YAHOO.util.Event.onDOMReady(function (){
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//create the logger
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var logger = new YAHOO.tool.TestLogger();
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//add the test suite to the runner's queue
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YAHOO.tool.TestRunner.add(YAHOO.example.yuitest.AsyncTestCase);
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//run the tests
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YAHOO.tool.TestRunner.run();
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});
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</textarea>
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<p>Before running the tests, it's necessary to create a <code>TestLogger</code> object to display the results (otherwise the tests would run
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but you wouldn't see the results). After that, the <code>TestRunner</code> is loaded with the <code>TestCase</code> object by calling
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<code>add()</code> (any number of <code>TestCase</code> and <code>TestSuite</code> objects can be added to a <code>TestRunner</code>,
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this example only adds one for simplicity). The very last step is to call <code>run()</code>, which begins executing the tests in its
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queue and displays the results in the <code>TestLogger</code>.</p>
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<h2>Configuration for This Example</h2>
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<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers. <a href="http://developer.yahoo.com/yui/articles/hosting/?event&dom&logger&yuitest&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>
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</div>
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<div class="yui-u">
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<div id="examples">
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<h3 class='firstContent'>YUI Test Utility Examples:</h3>
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<div id="exampleToc">
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<ul>
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<li><a href='../yuitest/yt-simple-example.html'>Simple Testing Example</a></li><li><a href='../yuitest/yt-advanced-test-options.html'>Advanced Test Options</a></li><li><a href='../yuitest/yt-array-tests.html'>Array Processing</a></li><li class='selected'><a href='../yuitest/yt-async-test.html'>Asynchronous Testing</a></li><li><a href='../yuitest/yt-async-event-tests.html'>Asynchronous Event Testing</a></li> </ul>
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</div>
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</div>
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<div id="module">
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<h3>More YUI Test Utility Resources:</h3>
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<ul>
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<li><a href="http://developer.yahoo.com/yui/yuitest/">User's Guide</a> (external)</li>
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<li><a href="../../docs/module_yuitest.html">API Documentation</a></li>
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<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/yuitest.pdf">Cheat Sheet PDF</a> (external)</li></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 class="yui-b" 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">Yahoo! UI Library</li><li class="item"><a title="The Yahoo! User Interface Library (YUI)" href="http://developer.yahoo.com/yui/">Home (external)</a></li><li class="item"><a title="The Yahoo! 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(external)</a></li><li class="item"><a title="Best practices for working with web services while protecting user privacy" href="http://developer.yahoo.com/security/">Security Best Practices (external)</a></li></ul>
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</div><!--closes bd-->
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<div id="ft">
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<p class="first">Copyright © 2010 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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