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+ <title>The valuechange Event</title>
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+ </div>
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+ <a href="#toc" class="jump">Jump to Table of Contents</a>
+
+
+ <h1>The valuechange Event</h1>
+ <div class="yui3-g">
+ <div class="yui3-u-3-4">
+ <div id="main">
+ <div class="content"><div class="intro">
+ <p>The <code>event-valuechange</code> module adds a "valuechange" event that fires
+ when the <code>value</code> property of an <code><input></code> or <code><textarea></code> element changes as
+ the result of a keystroke, mouse operation, or input method editor (IME)
+ input event.</p>
+</div>
+
+<h2 id="whats-the-problem">What's the problem?</h2>
+
+<p>The input related events provided by browsers don't cleanly address the
+variety of ways users can modify an <code><input></code> or <code><textarea></code>'s
+<code>value</code>. For example, users might change an input value by:</p>
+
+<ul>
+ <li>typing a simple character</li>
+ <li>typing a multi-stroke character</li>
+ <li>
+ using an <a href="http://en.wikipedia.org/wiki/Input_method">Input
+ Method Editor</a>
+ </li>
+ <li>cutting from or pasting into the value with <code>Ctrl+X</code> or <code>Cmd+V</code></li>
+ <li>cutting or pasting with a keyboard-summoned context menu</li>
+ <li>cutting or pasting from the right-click context menu.</li>
+</ul>
+
+<p>The ideal change event would fire when the value becomes <em>something it
+wasn't a moment ago</em>.</p>
+
+<p>The <code>valuechange</code> event provides more reliable input notifications than
+native events like <code>oninput</code> and <code>textInput</code>, particularly with changes that
+result from multiple-keystroke IME input.</p>
+
+<pre class="code prettyprint">commentTextarea.on('valuechange', updateLivePreview);</pre>
+
+
+<h2 id="how-it-works">How it works</h2>
+
+<p><code>valuechange</code> subscriptions monitor the element's value using a variety of
+mechanisms including subscriptions to <code>focus</code> and various keyboard events, and a
+poll to catch the stragglers. It seems like a lot of work, but it's the only
+way to be sure.</p>
+
+<p>Polling is only active when the element is focused, and only one element is
+polled at a time, so the performance of your app should not be impacted.</p>
+
+<h2 id="caveats">Caveats</h2>
+
+<ul>
+ <li>
+ <p>
+ <code>valuechange</code> only supports subscriptions on <code><input></code> and
+ <code><textarea></code> elements, although it doesn't prevent you from subscribing
+ on other types of elements. If you subscribe on a different type of element
+ and stuff breaks, you were warned.
+ </p>
+ </li>
+
+ <li>
+ <p>
+ <code>valuechange</code> does not capture <code>value</code> updates done in JavaScript
+ <em>unless the input is currently focused and polling</em>. It's meant
+ to capture changes made by the user, not by other code. So:
+ <code>node.set('value', 'probably will not trigger valuechange');</code>
+ </p>
+ </li>
+</ul>
+</div>
+ </div>
+ </div>
+
+ <div class="yui3-u-1-4">
+ <div class="sidebar">
+
+ <div id="toc" class="sidebox">
+ <div class="hd">
+ <h2 class="no-toc">Table of Contents</h2>
+ </div>
+
+ <div class="bd">
+ <ul class="toc">
+<li>
+<a href="#whats-the-problem">What's the problem?</a>
+</li>
+<li>
+<a href="#how-it-works">How it works</a>
+</li>
+<li>
+<a href="#caveats">Caveats</a>
+</li>
+</ul>
+ </div>
+ </div>
+
+
+
+ <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: 'event',
+ title: 'The valuechange Event',
+ 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>
+
+
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+</html>