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+<!DOCTYPE html>
+<html lang="en">
+<head>
+ <meta charset="utf-8">
+ <title>Example: Simple DOM Events</title>
+ <link rel="stylesheet" href="http://fonts.googleapis.com/css?family=PT+Sans:400,700,400italic,700italic">
+ <link rel="stylesheet" href="../../build/cssgrids/cssgrids-min.css">
+ <link rel="stylesheet" href="../assets/css/main.css">
+ <link rel="stylesheet" href="../assets/vendor/prettify/prettify-min.css">
+ <link rel="shortcut icon" type="image/png" href="../assets/favicon.png">
+ <script src="../../build/yui/yui-min.js"></script>
+
+</head>
+<body>
+<!--
+<a href="https://github.com/yui/yui3"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on GitHub"></a>
+-->
+<div id="doc">
+ <div id="hd">
+ <h1><img src="http://yuilibrary.com/img/yui-logo.png"></h1>
+ </div>
+
+
+ <h1>Example: Simple DOM Events</h1>
+ <div class="yui3-g">
+ <div class="yui3-u-3-4">
+ <div id="main">
+ <div class="content"><style scoped>
+#container {
+ background-color: #F5E3B1;
+ border: 1px solid #C2AE6D;
+ height: 76px;
+ /*padding: 1em 0 0 1em;*/
+ padding-left: 1em;
+ cursor: pointer;
+}
+#demo .hello {
+ background: url("../assets/event/earth.png") no-repeat scroll 141px -62px #000000;
+ color: #C3A7CD;
+ border-color: #000;
+ font-size: 150%;
+}
+#example-canvas #demo a {
+ color: #00c;
+ text-decoration: underline;
+}
+.message {
+ visibility: hidden;
+}
+</style>
+
+<div class="intro">
+<p>Clicking in the yellow box will give hello world feedback.
+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 display
+a message 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 yellow box;</li>
+ <li>Attach an event handler to the second <code><a></code>
+ element that uses <code>preventDefault()</code> to prevent the link,
+ when clicked, from navigating to a new page. </li>
+
+</ol>
+</div>
+
+<div class="example yui3-skin-sam">
+ <div id="demo">
+ <div id="container">
+ <p>Click for Hello World test.</p>
+ </div>
+ <p><a href="http://yuilibrary.com" id="firstA">The YUI Library. (Link navigates away from page.)</a></p>
+
+ <a href="http://yuilibrary.com" id="secondA">The YUI Library. (Link's default behavior is suppressed.)</a>
+ <div class="message">
+ When you clicked on the second link, *preventDefault* was called, so it did not navigate away from the page.
+ </div>
+
+</div>
+
+<script>
+YUI().use('node', function (Y) {
+ // A function that gives hello world feedback:
+ var helloWorld = function(e) {
+ e.target.setHTML("<p>Hello World!</p>");
+ Y.one('#container').addClass('hello');
+ }
+
+ // subscribe the helloWorld function as an event handler for the click
+ // event on the container div:
+ var node = Y.one("#container");
+
+ node.on("click", helloWorld);
+
+ // A function that displays a message and prevents the default behavior of
+ // the event for which it is a handler:
+ var interceptLink = function(e) {
+ e.preventDefault();
+ Y.one('.message').setStyle('visibility', 'visible');
+ }
+
+ // subscribe our interceptLink function as a click handler for the second
+ // anchor element:
+ Y.one('#secondA').on("click", interceptLink);
+});
+</script>
+
+
+</div>
+
+<h2>Reacting to the <code>click</code> event</h2>
+
+<p>To illustrate event handling syntax, we'll create a <code><div></code> and
+give some feedback when that <code><div></code> is clicked.</p>
+
+<pre class="code prettyprint">// Create a YUI instance and load the 'node' module
+YUI().use('node', function (Y) {
+
+ // A function that gives hello world feedback:
+ var helloWorld = function(e) {
+ e.target.setHTML("<p>Hello World!</p>");
+ Y.one('#container').addClass('hello');
+ }
+
+ ...</pre>
+
+
+<p>We now use the Node's <code>on</code> method to attach our
+<code>helloWorld</code> function as a handler for the <code>click</code> event.
+
+<pre class="code prettyprint">// Point to the container div with the CSS selector
+var node = Y.one('#container');
+
+node.on("click", helloWorld);</pre>
+
+
+<p>Almost all event handling begins with a premise just this simple: we have an
+element to which something might happen (eg, it might be clicked) and, when
+that <em>does</em> happen, we want to do something (eg,
+<code>helloWorld</code>).</p>
+
+<h2 id="prevent">Preventing event behavior</h2>
+
+<p>In some cases, you may want to replace the default behavior of an event.
+For example, let's say you have two links on the page:</p>
+
+<pre class="code prettyprint"><p><a href="http://yuilibrary.com/" id="firstA">The YUI Library. (Link navigates away from page.)</a></p>
+
+<p><a href="http://yuilibrary.com/" id="secondA">The YUI Library. (Link's default behavior is suppressed.)</a></p></pre>
+
+
+<p>Let's say that when the second link is clicked, instead of navigating away
+from the current page, you want to display a message.
+The event object passed to your event handler is a facade — not
+the actual browser event object.
+This facade supports the <code>preventDefault</code> method for cancelling
+inherent browser behavior such as anchor links loading a new page.</p>
+
+<pre class="code prettyprint">// A function that stops the browser from navigating away
+// from the page, and instead displays a message.
+var interceptLink = function(e) {
+ e.preventDefault();
+ Y.one('.message').setStyle('visibility', 'visible');
+}
+
+// subscribe our interceptLink function to the second anchor
+Y.one('#secondA').on("click", interceptLink);</pre>
+
+
+<h2 id="fullcode">Full Code Listing</h2>
+<pre class="code prettyprint"><div id="demo">
+ <div id="container">
+ <p>Click for Hello World test.</p>
+ </div>
+ <p><a href="http://yuilibrary.com" id="firstA">The YUI Library. (Link navigates away from page.)</a></p>
+
+ <a href="http://yuilibrary.com" id="secondA">The YUI Library. (Link's default behavior is suppressed.)</a>
+ <div class="message">
+ When you clicked on the second link, *preventDefault* was called, so it did not navigate away from the page.
+ </div>
+
+</div>
+
+<script>
+YUI().use('node', function (Y) {
+ // A function that gives hello world feedback:
+ var helloWorld = function(e) {
+ e.target.setHTML("<p>Hello World!</p>");
+ Y.one('#container').addClass('hello');
+ }
+
+ // subscribe the helloWorld function as an event handler for the click
+ // event on the container div:
+ var node = Y.one("#container");
+
+ node.on("click", helloWorld);
+
+ // A function that displays a message and prevents the default behavior of
+ // the event for which it is a handler:
+ var interceptLink = function(e) {
+ e.preventDefault();
+ Y.one('.message').setStyle('visibility', 'visible');
+ }
+
+ // subscribe our interceptLink function as a click handler for the second
+ // anchor element:
+ Y.one('#secondA').on("click", interceptLink);
+});
+</script></pre>
+
+
+</div>
+ </div>
+ </div>
+
+ <div class="yui3-u-1-4">
+ <div class="sidebar">
+
+
+
+ <div class="sidebox">
+ <div class="hd">
+ <h2 class="no-toc">Examples</h2>
+ </div>
+
+ <div class="bd">
+ <ul class="examples">
+
+
+ <li data-description="Use the Event Utility to attach simple DOM event handlers.">
+ <a href="basic-example.html">Simple DOM Events</a>
+ </li>
+
+
+
+ <li data-description="Using the synthetic event API to create a DOM event that fires in response to arrow keys being pressed.">
+ <a href="synth-example.html">Creating an Arrow Event for DOM Subscription</a>
+ </li>
+
+
+
+ <li data-description="Supporting cross-device swipe gestures, using the event-move gesture events">
+ <a href="swipe-example.html">Supporting A Swipe Left Gesture</a>
+ </li>
+
+
+
+
+
+
+
+
+
+
+
+
+ </ul>
+ </div>
+ </div>
+
+
+
+ <div class="sidebox">
+ <div class="hd">
+ <h2 class="no-toc">Examples That Use This Component</h2>
+ </div>
+
+ <div class="bd">
+ <ul class="examples">
+
+
+
+
+
+
+
+
+ <li data-description="Creating an accessible menu button using the Focus Manager Node Plugin, Event's delegation support and mouseenter event, along with the Overlay widget and Node's support for the WAI-ARIA Roles and States.">
+ <a href="../node-focusmanager/node-focusmanager-button.html">Accessible Menu Button</a>
+ </li>
+
+
+
+ <li data-description="Shows how to extend the base widget class, to create your own Widgets.">
+ <a href="../widget/widget-extend.html">Extending the Base Widget Class</a>
+ </li>
+
+
+
+ <li data-description="Example Photo Browser application.">
+ <a href="../dd/photo-browser.html">Photo Browser</a>
+ </li>
+
+
+
+ <li data-description="Portal style example using Drag & Drop Event Bubbling and Animation.">
+ <a href="../dd/portal-drag.html">Portal Style Example</a>
+ </li>
+
+
+
+ <li data-description="Use IO to request data over HTTP.">
+ <a href="../io/get.html">HTTP GET to request data</a>
+ </li>
+
+
+ </ul>
+ </div>
+ </div>
+
+ </div>
+ </div>
+ </div>
+</div>
+
+<script src="../assets/vendor/prettify/prettify-min.js"></script>
+<script>prettyPrint();</script>
+
+<script>
+YUI.Env.Tests = {
+ examples: [],
+ project: '../assets',
+ assets: '../assets/event',
+ name: 'basic-example',
+ title: 'Simple DOM Events',
+ newWindow: '',
+ auto: false
+};
+YUI.Env.Tests.examples.push('basic-example');
+YUI.Env.Tests.examples.push('synth-example');
+YUI.Env.Tests.examples.push('swipe-example');
+YUI.Env.Tests.examples.push('node-focusmanager-button');
+YUI.Env.Tests.examples.push('widget-extend');
+YUI.Env.Tests.examples.push('photo-browser');
+YUI.Env.Tests.examples.push('portal-drag');
+YUI.Env.Tests.examples.push('get');
+
+</script>
+<script src="../assets/yui/test-runner.js"></script>
+
+
+
+</body>
+</html>