Simple Event Handling and Processing
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Sources of Intellectual Property Included in the YUI Library
YUI is issued by Yahoo! under the BSD license above. Below is a list of certain publicly available software that is the source of intellectual property in YUI, along with the licensing terms that pertain to thosesources of IP. This list is for informational purposes only and is not intended to represent an exhaustive list of third party contributions to the YUI.
* Douglas Crockford's JSON parsing and stringifying methods: In the JSON Utility, Douglas Crockford's JSON parsing and stringifying methods are adapted from work published at JSON.org. The adapted work is in the public domain.
* Robert Penner's animation-easing algorithms: In the Animation Utility, YUI makes use of Robert Penner's algorithms for easing.
* Geoff Stearns's SWFObject: In the Charts Control and the Uploader versions through 2.7.0, YUI makes use of Geoff Stearns's SWFObject v1.5 for Flash Player detection and embedding. More information on SWFObject can be found here (http://blog.deconcept.com/swfobject/). SWFObject is (c) 2007 Geoff Stearns and is released under the MIT License (http://www.opensource.org/licenses/mit-license.php).
* Diego Perini's IEContentLoaded technique: The Event Utility employs a technique developed by Diego Perini and licensed under GPL. YUI's use of this technique is included under our BSD license with the author's permission.
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Simple Event Handling and Processing</title>
<style type="text/css">
/*margin and padding on body element
can introduce errors in determining
element position and are not recommended;
we turn them off as a foundation for YUI
CSS treatments. */
body {
margin:0;
padding:0;
}
</style>
<link rel="stylesheet" type="text/css" href="yui_2.7.0b-lib/fonts/fonts-min.css" />
<script type="text/javascript" src="yui_2.7.0b-lib/yahoo-dom-event/yahoo-dom-event.js"></script>
<!--there is no custom header content for this example-->
</head>
<body class=" yui-skin-sam">
<h1>Simple Event Handling and Processing</h1>
<div class="exampleIntro">
<p>Clicking in the blue box will pop up a "Hello World!" alert window. Clicking on the first link will take you to the YUI website; clicking on the second link, which has the same <code>href</code> attribute, will pop up an alert instead and not navigate to a new page.</p>
<p>Event Utility is used here to do two things:</p>
<ol>
<li>Attach the <code>click</code> event handler to the blue box;</li>
<li>Attach an event handler to the second <code><a></code> element that uses <code>YAHOO.util.Event.preventDefault()</code> to prevent the link, when clicked, from navigating to a new page. </li>
</ol>
</div>
<!--BEGIN SOURCE CODE FOR EXAMPLE -->
<script>
(function() {
//A function that pops up a "Hello World" alert:
var helloWorld = function(e) {
YAHOO.log("helloWorld function firing.", "info", "example");
alert("Hello World!");
}
//subscribe the helloWorld function as an event
//handler for the click event on the container
//div:
YAHOO.util.Event.addListener("container", "click", helloWorld);
//A function that pops up an alert and
//prevents the default behavior of the event
//for which it is a handler:
var interceptLink = function(e) {
YAHOO.util.Event.preventDefault(e);
YAHOO.log("You clicked on the second YUI link.", "info", "example");
alert("You clicked on the second YUI link.");
}
//subscribe our interceptLink function
//as a click handler for the second anchor
//element:
YAHOO.util.Event.addListener("secondA", "click", interceptLink);
//log message to indicate that the example is ready:
YAHOO.log("When you begin interacting with the example at left, you'll see log messages appear here.", "info", "example");
})();
</script>
<style>
#container {background-color:#00CCFF; border:1px dotted black; padding:1em; cursor:pointer;}
</style>
<div id="container">
<p>Click for Hello World alert.</p>
</div>
<p><a href="http://developer.yahoo.com/yui" id="firstA">The YUI Library. (Link navigates away from page.)</a></p>
<p><a href="http://developer.yahoo.com/yui" id="secondA">The YUI Library. (Link's default behavior is suppressed.)</a></p>
<!--END SOURCE CODE FOR EXAMPLE -->
</body>
</html>
<!-- presentbright.corp.yahoo.com uncompressed/chunked Thu Feb 19 10:53:15 PST 2009 -->
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