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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>YUI Library Examples: Dom Collection: Using getStyle</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<link rel="stylesheet" type="text/css" href="../../assets/yui.css" >
<style>
/*Supplemental CSS for the YUI distribution*/
#custom-doc { width: 95%; min-width: 950px; }
#pagetitle {background-image: url(../../assets/bg_hd.gif);}
</style>
<link rel="stylesheet" type="text/css" href="../../assets/dpSyntaxHighlighter.css">
<!--Script and CSS includes for YUI dependencies on this page-->
<link rel="stylesheet" type="text/css" href="../../build/logger/assets/skins/sam/logger.css" />
<link rel="stylesheet" type="text/css" href="../../build/button/assets/skins/sam/button.css" />
<script type="text/javascript" src="../../build/yuiloader/yuiloader-min.js"></script>
<script type="text/javascript" src="../../build/event/event-min.js"></script>
<script type="text/javascript" src="../../build/dom/dom-debug.js"></script>
<script type="text/javascript" src="../../build/logger/logger-min.js"></script>
<script type="text/javascript" src="../../build/element/element-min.js"></script>
<script type="text/javascript" src="../../build/button/button-min.js"></script>
<!--begin custom header content for this example-->
<style type="text/css">
#foo {
background-color:#00f;
height:10px;
width:10px;
}
#bar {
width:100px;
height:100px;
background-color:#f00;
margin:0 0 1em 100px;
}
</style>
<!--end custom header content for this example-->
<script type="text/javascript">
//enable passthrough of errors from YUI Event:
if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
YAHOO.util.Event.throwErrors = true;
}
</script>
</head>
<body id="yahoo-com" class="yui-skin-sam">
<div id="custom-doc" class="yui-t2">
<div id="hd">
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<p><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></p>
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<input name="vs" type="hidden" value="developer.yahoo.com">
<input name="vs" type="hidden" value="yuiblog.com">
<div id="sitesearch">
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<div id="ygma"><a href="../../"><img src="../../assets/yui.gif" border="0" height="38"></a></div>
<div id="pagetitle"><h1>YUI Library Examples: Dom Collection: Using getStyle</h1></div>
</div>
<div id="bd">
<div id="yui-main">
<div class="yui-b">
<div class="yui-ge">
<div class="yui-u first example">
<div class="promo">
<h1>Dom Collection: Using getStyle</h1>
<div class="exampleIntro">
<p>Clicking the button will use Dom's <code>getStyle</code> method to get the background color of the red element and pass it to the <code>setStyle</code> method, which will set the blue element's background to the same color.</p>
</div>
<div class="example-container module ">
<div class="hd exampleHd">
<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="getstyle_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->
</div> <div id="example-canvas" class="bd">
<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<div id="foo"></div>
<div id="bar"></div>
<button id="demo-run">run</button>
<script type="text/javascript">
(function() {
var setBgColor = function() {
var bgcolor = YAHOO.util.Dom.getStyle('bar', 'backgroundColor');
YAHOO.util.Dom.setStyle('foo', 'backgroundColor', bgcolor);
};
YAHOO.util.Event.on('demo-run', 'click', setBgColor);
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 =============================== -->
</div>
</div>
</div>
<h2 class="first">Using getStyle</h2>
<p><a href="/yui/dom/#getstyle"><code>getStyle</code></a>, part of the <a href="http://developer.yahoo.com/yui/dom/">YUI Dom Collection</a>, makes it easy to get the value of style properties from HTMLElements.</p>
<p>To illustrate the use of <code>getStyle</code>, we'll create a <code>&lt;div&gt;</code> called <code>foo</code> and a <code>&lt;div&gt;</code> called <code>bar</code>. When the button is clicked, the background color from <code>bar</code> will be applied to <code>foo</code>.</p>
<p>Add some simple CSS rules and markup for the demo element and a button to trigger the demo:</p>
<textarea name="code" class="HTML" cols="60" rows="1">
<style type="text/css">
#foo {
background-color:#00f;
height:10px;
width:10px;
}
#bar {
width:100px;
height:100px;
background-color:#f00;
margin:0 0 1em 100px;
}
</style>
<div id="foo"></div>
<div id="bar"></div>
<button id="demo-run">run</button>
</textarea>
<p>Now we will define the function that sets the background color of <code>foo</code> to the background color of <code>bar</code>. The first argument of the <code>getStyle</code> method is either the ID of an HTMLElement, or an actual HTMLElement object. The second is the style property that we wish to retrieve. The <code>getStyle</code> method returns the element's current value for that property.
<textarea name="code" class="JScript" cols="60" rows="1">
<script type="text/javascript">
var setBgColor = function() {
var bgcolor = YAHOO.util.Dom.getStyle('bar', 'backgroundColor');
YAHOO.util.Dom.setStyle('foo', 'backgroundColor', bgcolor);
};
</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', setBgColor);
</script>
</textarea>
<p>This is a simple example of how to use the <code>YAHOO.util.Dom.getStyle</code> method. One of the benefits of this method is that it can retrieve either inline styles or styles set in a stylesheet. Browsers have different methods for retrieveing styles from a stylesheet, but the <code>getStyle</code> method normalizes these for you.</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>
</div>
<div class="yui-u">
<div id="loggerModule" class="yui-skin-sam">
<h3 class="firstContent">YUI Logger Output:</h3>
<div id="loggerDiv"></div>
<div id="loggerGloss">
<p><strong>Note:</strong> You are viewing this example in debug mode with logging enabled. This can significantly slow performance.</p>
<p class="loggerButton"><span id="loggerLink"><span class="first-child"><a href="getstyle.html">Reload with logging<br />and debugging disabled.</a></span></span></p>
</div>
</div>
<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 class='selected'><a href='../dom/getstyle.html'>Using getStyle</a></li><li><a href='../dom/hasclass.html'>Using hasClass</a></li><li><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>
</div>
</div>
<div id="module">
<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>
</div>
</div>
</div>
</div>
</div>
<div class="yui-b" id="tocWrapper">
<!-- TABLE OF CONTENTS -->
<div id="toc">
<ul>
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