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230 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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<title>YUI Library Examples: Dom Collection: Using setXY</title>
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/*Supplemental CSS for the YUI distribution*/
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margin-bottom:1em;
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}
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<!--end custom header content for this example-->
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<script type="text/javascript">
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//enable passthrough of errors from YUI Event:
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if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
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YAHOO.util.Event.throwErrors = true;
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}
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</script>
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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><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></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 & 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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</form> </div>
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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: Dom Collection: Using setXY</h1></div>
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</div>
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<div id="bd">
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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>Dom Collection: Using setXY</h1>
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<div class="exampleIntro">
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<p>Clicking the document will use Dom's <code>setXY</code> method to position the element to the click point.</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="setxy_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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<style type="text/css">
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#foo {width:10px; height:10px;background-color:#00f;}
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</style>
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<div id="foo"></div>
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<script>
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(function() {
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var move = function(e) {
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YAHOO.util.Dom.setXY('foo', YAHOO.util.Event.getXY(e));
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};
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YAHOO.util.Event.on(document, "click", move);
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YAHOO.log("The example has finished loading; as you interact with it, you'll see log messages appearing here.", "info", "example");
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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">Using setXY</h2>
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<p><a href="/yui/dom/#setxy"><code>setXY</code></a>, part of the <a href="http://developer.yahoo.com/yui/dom/">YUI Dom Collection</a>, makes it easy to position an element relative to the document.</p>
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<p>To illustrate the use of <code>setXY</code>, we'll create a single <code><div></code> called <code>foo</code> that positions itself to the cursor when the document is clicked.</p>
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<p>Add some simple CSS rules and markup for the demo element and a button to activate the demo:</p>
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<textarea name="code" class="HTML" cols="60" rows="1">
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<style type="text/css">
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#foo {
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background-color:#00f;
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height:10px;
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width:10px;
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}
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</style>
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<div id="foo"></div>
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<button id="demo-run">run</button>
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</textarea>
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<p>Now we will define the function that moves the element based on the position of the click. The first argument of the <code>setXY</code> method is either the ID of an HTMLElement, or an actual HTMLElement object. The second argument is 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/event/">YUI Event Utility</a> provides a <code>getXY</code> method that accepts an event object as an argument, and returns the position of the cursor at the time of the click. The returned position is an array in the same format as the <code>setXY</code> array, so it can be fed directly to the <code>setXY</code> method.</p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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<script type="text/javascript">
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var move = function(e) {
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YAHOO.util.Dom.setXY('foo', YAHOO.util.Event.getXY(e));
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};
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</script>
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</textarea>
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<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 document. </p>
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<textarea name="code" class="JScript" cols="60" rows="1">
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<script type="text/javascript">
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YAHOO.util.Event.on('demo-run', 'click', move);
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</script>
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</textarea>
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<p>This is a simple example of how to use the <code>YAHOO.util.Dom.setXY</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, and <code>offsetParent</code> (any positioned ancestor), or other factors that may affect it, <code>setXY</code> will ensure the final position is accurate in document coordinates (e.g. <code>[0, 0]</code> will be the upper left corner of the document).</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&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="loggerModule" class="yui-skin-sam">
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<h3 class="firstContent">YUI Logger Output:</h3>
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<div id="loggerDiv"></div>
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<div id="loggerGloss">
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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>
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<p class="loggerButton"><span id="loggerLink"><span class="first-child"><a href="setxy.html">Reload with logging<br />and debugging disabled.</a></span></span></p>
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</div>
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</div>
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<div id="examples">
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<h3>Dom Collection Examples:</h3>
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<div id="exampleToc">
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<ul>
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<li class='selected'><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><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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</div>
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</div>
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<div id="module">
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<h3>More Dom Collection Resources:</h3>
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<ul>
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<li><a href="http://developer.yahoo.com/yui/dom/">User's Guide</a> (external)</li>
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<li><a href="../../docs/module_dom.html">API Documentation</a></li>
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<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/dom.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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