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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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<head>
<title>YUI Library Examples: Dom Collection: Using getXY</title>
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//enable passthrough of errors from YUI Event:
if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
YAHOO.util.Event.throwErrors = true;
}
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<div id="pagetitle"><h1>YUI Library Examples: Dom Collection: Using getXY</h1></div>
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<div class="yui-u first example">
<div class="promo">
<h1>Dom Collection: Using getXY</h1>
<div class="exampleIntro">
<p>Clicking the button will use Dom's <code>getXY</code> method to get the position of the red element and pass it to the <code>setXY</code> method, which will move the blue element to that position.</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="getxy_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 move = function() {
var xy = YAHOO.util.Dom.getXY('bar');
YAHOO.util.Dom.setXY('foo', xy);
};
YAHOO.util.Event.on('demo-run', 'click', move);
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 getXY</h2>
<p><a href="/yui/dom/#getxy"><code>getXY</code></a>, part of the <a href="http://developer.yahoo.com/yui/dom/">YUI Dom Collection</a>, makes it easy to get an element's position relative to the document.</p>
<p>To illustrate the use of <code>getXY</code>, we'll create a <code><div></code> called <code>foo</code> and a <code><div></code> called <code>bar</code>. When the document is clicked, <code>foo</code> will move to the top left corner of <code>bar</code>.</p>
<p>Start with some simple CSS rules, markup for the demo elements, 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 {
background-color:#f00;
height:100px;
width:100px;
margin:0 100px 1em;
}
</style>
<div id="foo"></div>
<div id="bar"></div>
<button id="demo-run">run</button>
</textarea>
<p>Now we will define the function that moves <code>foo</code> to the <code>xy</code> position of <code>bar</code>. The only argument of the <code>getXY</code> method is either the ID of an HTMLElement, or an actual HTMLElement object. The <code>getXY</code> method returns an array containing two values: <code>[x, y]</code> where <code>x</code> is the distance from the left edge of the document, and <code>y</code> is the distance from the top edge of the document. The <a href="http://developer.yahoo.com/yui/dom/">YUI Dom Collection</a> provides a <code>setXY</code> that accepts an array in the same format.</p>
<textarea name="code" class="JScript" cols="60" rows="1">
<script type="text/javascript">
var move = function() {
var xy = YAHOO.util.Dom.getXY('bar');
YAHOO.util.Dom.setXY('foo', xy);
};
</script>
</textarea>
<p>Next 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">
YAHOO.util.Event.on('demo-run', 'click', move);
</textarea>
<p>This is a simple example of how to use the <code>YAHOO.util.Dom.getXY</code> method. One of the powerful things about this is that regardless of what is influencing the element's position, be it positioning (absolute, relative, etc.), margins, an <code>offsetParent</code> (any positioned ancestor), or any other factors that may affect it, <code>getXY</code> will return a position in document coordinates (e.g. <code>[0, 0]</code> will be the upper left corner of the document).</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>
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<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="getxy.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 class='selected'><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><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>
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