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<title>YUI Library Examples: Dom Collection: Using addClass</title>
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<div id="pagetitle"><h1>YUI Library Examples: Dom Collection: Using addClass</h1></div>
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<h1>Dom Collection: Using addClass</h1>
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<p>Clicking the button will use Dom's <code>addClass</code> method to add the class <code>baz</code> to the element.</p>
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<div class="example-container module ">
<div class="hd exampleHd">
<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="addclass_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->
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<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<div id="foo" class="bar">foo</div>
<button id="demo-run">run</button>
<script type="text/javascript">
(function() {
var addClass = function(e) {
YAHOO.util.Dom.addClass('foo', 'baz');
alert(YAHOO.util.Dom.get('foo').className);
};
YAHOO.util.Event.on('demo-run', 'click', addClass);
YAHOO.log("The example has finished loading; as you interact with it, you'll see log messages appearing here.", "info", "example");
})();
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
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<h2 class="first">Using addClass</h2>
<p><a href="/yui/dom/#addClass">addClass</a>, part of the <a href="http://developer.yahoo.com/yui/dom/">YUI Dom Collection</a>, makes it easy to add a given className to an element.</p>
<p>To illustrate the use of addClass, we'll create a <code>&lt;div&gt;</code> called <code>foo</code> with the className of <code>bar</code>. When the button is clicked, we will add the className <code>baz</code> to the element.</p>
<p>Add some markup for the demo element and a button to trigger the demo:</p>
<textarea name="code" class="HTML" cols="60" rows="1">
<div id="foo" class="bar">foo</div>
<button id="demo-run">run</button>
</textarea>
<p>Now we will define the function that adds the class <code>baz</code> to the <code>foo</code> element. The first argument of the <code>addClass</code> method is either the ID of an HTMLElement, or an actual HTMLElement object. The second is the className to be added.
<textarea name="code" class="JScript" cols="60" rows="1">
<script type="text/javascript">
var addClass = function() {
YAHOO.util.Dom.addClass('foo', 'baz');
alert(YAHOO.util.Dom.get('foo').className);
};
</script>
</textarea>
<p>To trigger the demo, we will use the <a href="http://developer.yahoo.com/yui/event/">YUI Event Utility</a>'s <code>on</code> method to listen for clicks on the button.</p>
<textarea name="code" class="JScript" cols="60" rows="1">
<script type="text/javascript">
YAHOO.util.Event.on('demo-run', 'click', addClass);
</script>
</textarea>
<p>This is a simple example of how to use the Dom.addClass method. One of the benefits of this method is that it works regardless of how many classNames are present in the class attribute.</p>
<h2>Configuration for This Example</h2>
<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&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>
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<h3 class="firstContent">YUI Logger Output:</h3>
<div id="loggerGloss"><p><strong>Note:</strong> Logging and debugging is currently turned off for this example.</p>
<p class="loggerButton"><span id="loggerLink"><span class="first-child"><a href="addclass_log.html">Reload with logging<br />
and debugging enabled.</a></span></span></p></div>
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<div id="examples">
<h3>Dom Collection Examples:</h3>
<div id="exampleToc">
<ul>
<li><a href='../dom/setxy.html'>Using setXY</a></li><li><a href='../dom/getxy.html'>Using getXY</a></li><li><a href='../dom/setstyle.html'>Using setStyle</a></li><li><a href='../dom/getstyle.html'>Using getStyle</a></li><li><a href='../dom/hasclass.html'>Using hasClass</a></li><li class='selected'><a href='../dom/addclass.html'>Using addClass</a></li><li><a href='../dom/removeclass.html'>Using removeClass</a></li><li><a href='../dom/getelementsbyclassname.html'>Using getElementsByClassName</a></li><li><a href='../dom/dom-explorer.html'>Exploring the Dom Collection's API</a></li> </ul>
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<h3>More Dom Collection Resources:</h3>
<ul>
<li><a href="http://developer.yahoo.com/yui/dom/">User's Guide</a> (external)</li>
<li><a href="../../docs/module_dom.html">API Documentation</a></li>
<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/dom.pdf">Cheat Sheet PDF</a> (external)</li></ul>
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