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<h3>value-change&nbsp; <span class="subtitle">3.2.0pr1</span></h3>
<a href="/index.html" title="Yahoo! UI Library">Yahoo! UI Library</a>
&gt; <a href="/module_value-change.html" title="value-change">value-change</a>
&gt; value-change.js (source view)
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<div class="highlight"><pre><span class="cm">/**</span>
<span class="cm"> * Adds a synthetic &lt;code&gt;valueChange&lt;/code&gt; event that fires when the</span>
<span class="cm"> * &lt;code&gt;value&lt;/code&gt; property of an input field or textarea changes as a result</span>
<span class="cm"> * of a keystroke, mouse operation, or input method editor (IME) input event.</span>
<span class="cm"> *</span>
<span class="cm"> * @module value-change</span>
<span class="cm"> */</span>
<span class="cm">/**</span>
<span class="cm"> * Provides the implementation for the synthetic &lt;code&gt;valueChange&lt;/code&gt; event.</span>
<span class="cm"> *</span>
<span class="cm"> * @class ValueChange</span>
<span class="cm"> * @static</span>
<span class="cm"> */</span>
<span class="kd">var</span> <span class="nx">VALUE</span> <span class="o">=</span> <span class="s1">&#39;value&#39;</span><span class="p">,</span>
<span class="nx">VALUE_CHANGE</span> <span class="o">=</span> <span class="s1">&#39;valueChange&#39;</span><span class="p">,</span>
<span class="c1">// Just a simple namespace to make methods overridable.</span>
<span class="nx">VC</span> <span class="o">=</span> <span class="p">{</span>
<span class="c1">// -- Static Constants -----------------------------------------------------</span>
<span class="nx">TIMEOUT</span><span class="o">:</span> <span class="mi">10000</span><span class="p">,</span>
<span class="c1">// -- Protected Static Properties ------------------------------------------</span>
<span class="nx">_events</span> <span class="o">:</span> <span class="p">{},</span>
<span class="nx">_history</span> <span class="o">:</span> <span class="p">{},</span>
<span class="nx">_intervals</span><span class="o">:</span> <span class="p">{},</span>
<span class="nx">_timeouts</span> <span class="o">:</span> <span class="p">{},</span>
<span class="c1">// -- Protected Static Methods ---------------------------------------------</span>
<span class="nx">_poll</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">node</span><span class="p">,</span> <span class="nx">e</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">stamp</span> <span class="o">=</span> <span class="nx">Y</span><span class="p">.</span><span class="nx">stamp</span><span class="p">(</span><span class="nx">node</span><span class="p">),</span>
<span class="nx">newVal</span> <span class="o">=</span> <span class="nx">node</span><span class="p">.</span><span class="nx">get</span><span class="p">(</span><span class="nx">VALUE</span><span class="p">),</span>
<span class="nx">prevVal</span> <span class="o">=</span> <span class="nx">VC</span><span class="p">.</span><span class="nx">_history</span><span class="p">[</span><span class="nx">stamp</span><span class="p">];</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">newVal</span> <span class="o">!==</span> <span class="nx">prevVal</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_history</span><span class="p">[</span><span class="nx">stamp</span><span class="p">]</span> <span class="o">=</span> <span class="nx">newVal</span><span class="p">;</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_events</span><span class="p">[</span><span class="nx">stamp</span><span class="p">].</span><span class="nx">fire</span><span class="p">({</span>
<span class="c1">// _event : e, // TODO: is this correct?</span>
<span class="nx">newVal</span> <span class="o">:</span> <span class="nx">newVal</span><span class="p">,</span>
<span class="nx">prevVal</span><span class="o">:</span> <span class="nx">prevVal</span>
<span class="p">});</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_startPolling</span><span class="p">(</span><span class="nx">node</span><span class="p">,</span> <span class="nx">e</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">},</span>
<span class="nx">_startPolling</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">node</span><span class="p">,</span> <span class="nx">e</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">stamp</span> <span class="o">=</span> <span class="nx">Y</span><span class="p">.</span><span class="nx">stamp</span><span class="p">(</span><span class="nx">node</span><span class="p">);</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_stopPolling</span><span class="p">(</span><span class="nx">node</span><span class="p">);</span> <span class="c1">// avoid dupes</span>
<span class="c1">// Poll for changes to the node&#39;s value. We can&#39;t rely on keyboard</span>
<span class="c1">// events for this, since the value may change due to a mouse-initiated</span>
<span class="c1">// paste event, an IME input event, or for some other reason that</span>
<span class="c1">// doesn&#39;t trigger a key event.</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_intervals</span><span class="p">[</span><span class="nx">stamp</span><span class="p">]</span> <span class="o">=</span> <span class="nx">setInterval</span><span class="p">(</span><span class="nx">Y</span><span class="p">.</span><span class="nx">bind</span><span class="p">(</span><span class="nx">VC</span><span class="p">.</span><span class="nx">_poll</span><span class="p">,</span> <span class="kc">null</span><span class="p">,</span> <span class="nx">node</span><span class="p">,</span> <span class="nx">e</span><span class="p">),</span> <span class="mi">20</span><span class="p">);</span>
<span class="c1">// If we don&#39;t see any changes within the timeout period (10 seconds by</span>
<span class="c1">// default), stop polling.</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_timeouts</span><span class="p">[</span><span class="nx">stamp</span><span class="p">]</span> <span class="o">=</span> <span class="nx">setTimeout</span><span class="p">(</span><span class="nx">Y</span><span class="p">.</span><span class="nx">bind</span><span class="p">(</span><span class="nx">VC</span><span class="p">.</span><span class="nx">_stopPolling</span><span class="p">,</span> <span class="kc">null</span><span class="p">,</span> <span class="nx">node</span><span class="p">),</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">TIMEOUT</span><span class="p">);</span>
<span class="p">},</span>
<span class="nx">_stopPolling</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">node</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">stamp</span> <span class="o">=</span> <span class="nx">Y</span><span class="p">.</span><span class="nx">stamp</span><span class="p">(</span><span class="nx">node</span><span class="p">);</span>
<span class="nx">clearTimeout</span><span class="p">(</span><span class="nx">VC</span><span class="p">.</span><span class="nx">_timeouts</span><span class="p">[</span><span class="nx">stamp</span><span class="p">]);</span>
<span class="nx">clearInterval</span><span class="p">(</span><span class="nx">VC</span><span class="p">.</span><span class="nx">_intervals</span><span class="p">[</span><span class="nx">stamp</span><span class="p">]);</span>
<span class="p">},</span>
<span class="c1">// -- Protected Static Event Handlers --------------------------------------</span>
<span class="nx">_onBlur</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_stopPolling</span><span class="p">(</span><span class="nx">e</span><span class="p">.</span><span class="nx">currentTarget</span><span class="p">);</span>
<span class="p">},</span>
<span class="nx">_onKeyDown</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_startPolling</span><span class="p">(</span><span class="nx">e</span><span class="p">.</span><span class="nx">currentTarget</span><span class="p">,</span> <span class="nx">e</span><span class="p">);</span>
<span class="p">},</span>
<span class="nx">_onKeyUp</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="p">{</span>
<span class="c1">// These charCodes indicate that an IME has started. We&#39;ll restart</span>
<span class="c1">// polling and give the IME up to 10 seconds (by default) to finish.</span>
<span class="k">if</span> <span class="p">(</span><span class="nx">e</span><span class="p">.</span><span class="nx">charCode</span> <span class="o">===</span> <span class="mi">229</span> <span class="o">||</span> <span class="nx">e</span><span class="p">.</span><span class="nx">charCode</span> <span class="o">===</span> <span class="mi">197</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_startPolling</span><span class="p">(</span><span class="nx">e</span><span class="p">.</span><span class="nx">currentTarget</span><span class="p">,</span> <span class="nx">e</span><span class="p">);</span>
<span class="p">}</span>
<span class="p">},</span>
<span class="nx">_onMouseDown</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">e</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_startPolling</span><span class="p">(</span><span class="nx">e</span><span class="p">.</span><span class="nx">currentTarget</span><span class="p">,</span> <span class="nx">e</span><span class="p">);</span>
<span class="p">},</span>
<span class="nx">_onSubscribe</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">node</span><span class="p">,</span> <span class="nx">subscription</span><span class="p">,</span> <span class="nx">customEvent</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">Y</span><span class="p">.</span><span class="nx">all</span><span class="p">(</span><span class="nx">node</span><span class="p">).</span><span class="nx">each</span><span class="p">(</span><span class="kd">function</span> <span class="p">(</span><span class="nx">node</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">stamp</span> <span class="o">=</span> <span class="nx">Y</span><span class="p">.</span><span class="nx">stamp</span><span class="p">(</span><span class="nx">node</span><span class="p">);</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_events</span><span class="p">[</span><span class="nx">stamp</span><span class="p">]</span> <span class="o">=</span> <span class="nx">customEvent</span><span class="p">;</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_history</span><span class="p">[</span><span class="nx">stamp</span><span class="p">]</span> <span class="o">=</span> <span class="nx">node</span><span class="p">.</span><span class="nx">get</span><span class="p">(</span><span class="nx">VALUE</span><span class="p">);</span>
<span class="nx">node</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="nx">VALUE_CHANGE</span> <span class="o">+</span> <span class="s1">&#39;|blur&#39;</span><span class="p">,</span> <span class="nx">VC</span><span class="p">.</span><span class="nx">_onBlur</span><span class="p">);</span>
<span class="nx">node</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="nx">VALUE_CHANGE</span> <span class="o">+</span> <span class="s1">&#39;|mousedown&#39;</span><span class="p">,</span> <span class="nx">VC</span><span class="p">.</span><span class="nx">_onMouseDown</span><span class="p">);</span>
<span class="nx">node</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="nx">VALUE_CHANGE</span> <span class="o">+</span> <span class="s1">&#39;|keydown&#39;</span><span class="p">,</span> <span class="nx">VC</span><span class="p">.</span><span class="nx">_onKeyDown</span><span class="p">);</span>
<span class="nx">node</span><span class="p">.</span><span class="nx">on</span><span class="p">(</span><span class="nx">VALUE_CHANGE</span> <span class="o">+</span> <span class="s1">&#39;|keyup&#39;</span><span class="p">,</span> <span class="nx">VC</span><span class="p">.</span><span class="nx">_onKeyUp</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">},</span>
<span class="nx">_onUnsubscribe</span><span class="o">:</span> <span class="kd">function</span> <span class="p">(</span><span class="nx">node</span><span class="p">,</span> <span class="nx">subscription</span><span class="p">,</span> <span class="nx">customEvent</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">Y</span><span class="p">.</span><span class="nx">all</span><span class="p">(</span><span class="nx">node</span><span class="p">).</span><span class="nx">each</span><span class="p">(</span><span class="kd">function</span> <span class="p">(</span><span class="nx">node</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">stamp</span> <span class="o">=</span> <span class="nx">Y</span><span class="p">.</span><span class="nx">stamp</span><span class="p">(</span><span class="nx">node</span><span class="p">);</span>
<span class="nx">node</span><span class="p">.</span><span class="nx">detachAll</span><span class="p">(</span><span class="nx">VALUE_CHANGE</span> <span class="o">+</span> <span class="s1">&#39;|*&#39;</span><span class="p">);</span>
<span class="nx">VC</span><span class="p">.</span><span class="nx">_stopPolling</span><span class="p">(</span><span class="nx">node</span><span class="p">);</span>
<span class="k">delete</span> <span class="nx">VC</span><span class="p">.</span><span class="nx">_events</span><span class="p">[</span><span class="nx">stamp</span><span class="p">];</span>
<span class="k">delete</span> <span class="nx">VC</span><span class="p">.</span><span class="nx">_history</span><span class="p">[</span><span class="nx">stamp</span><span class="p">];</span>
<span class="p">});</span>
<span class="p">}</span>
<span class="p">};</span>
<span class="cm">/**</span>
<span class="cm"> * &lt;p&gt;</span>
<span class="cm"> * Synthetic event that fires when the &lt;code&gt;value&lt;/code&gt; property of an input</span>
<span class="cm"> * field or textarea changes as a result of a keystroke, mouse operation, or</span>
<span class="cm"> * input method editor (IME) input event.</span>
<span class="cm"> * &lt;/p&gt;</span>
<span class="cm"> *</span>
<span class="cm"> * &lt;p&gt;</span>
<span class="cm"> * Unlike the &lt;code&gt;onchange&lt;/code&gt; event, this event fires when the value</span>
<span class="cm"> * actually changes and not when the element loses focus. This event also</span>
<span class="cm"> * reports IME and multi-stroke input more reliably than &lt;code&gt;oninput&lt;/code&gt; or</span>
<span class="cm"> * the various key events across browsers.</span>
<span class="cm"> * &lt;/p&gt;</span>
<span class="cm"> *</span>
<span class="cm"> * &lt;p&gt;</span>
<span class="cm"> * This event is provided by the &lt;code&gt;value-change&lt;/code&gt; module.</span>
<span class="cm"> * &lt;/p&gt;</span>
<span class="cm"> *</span>
<span class="cm"> * &lt;p&gt;</span>
<span class="cm"> * &lt;strong&gt;Usage example:&lt;/strong&gt;</span>
<span class="cm"> * &lt;/p&gt;</span>
<span class="cm"> *</span>
<span class="cm"> * &lt;code&gt;&lt;pre&gt;</span>
<span class="cm"> * YUI().use(&#39;value-change&#39;, function (Y) {</span>
<span class="cm"> * &amp;nbsp;&amp;nbsp;Y.one(&#39;input&#39;).on(&#39;valueChange&#39;, function (e) {</span>
<span class="cm"> * &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;// Handle valueChange events on the first input element on the page.</span>
<span class="cm"> * &amp;nbsp;&amp;nbsp;});</span>
<span class="cm"> * });</span>
<span class="cm"> * &lt;/pre&gt;&lt;/code&gt;</span>
<span class="cm"> *</span>
<span class="cm"> * @event valueChange</span>
<span class="cm"> * @param {EventFacade} e Event facade with the following additional</span>
<span class="cm"> * properties:</span>
<span class="cm"> *</span>
<span class="cm"> * &lt;dl&gt;</span>
<span class="cm"> * &lt;dt&gt;prevVal (String)&lt;/dt&gt;</span>
<span class="cm"> * &lt;dd&gt;</span>
<span class="cm"> * Previous value before the latest change.</span>
<span class="cm"> * &lt;/dd&gt;</span>
<span class="cm"> *</span>
<span class="cm"> * &lt;dt&gt;newVal (String)&lt;/dt&gt;</span>
<span class="cm"> * &lt;dd&gt;</span>
<span class="cm"> * New value after the latest change.</span>
<span class="cm"> * &lt;/dd&gt;</span>
<span class="cm"> * &lt;/dl&gt;</span>
<span class="cm"> *</span>
<span class="cm"> * @for YUI</span>
<span class="cm"> */</span>
<span class="c1">// FIXME: synthetic events don&#39;t seem to respect the context param of on()</span>
<span class="nx">Y</span><span class="p">.</span><span class="nx">Event</span><span class="p">.</span><span class="nx">define</span><span class="p">(</span><span class="nx">VALUE_CHANGE</span><span class="p">,</span> <span class="p">{</span>
<span class="nx">detach</span><span class="o">:</span> <span class="nx">VC</span><span class="p">.</span><span class="nx">_onUnsubscribe</span><span class="p">,</span>
<span class="nx">on</span> <span class="o">:</span> <span class="nx">VC</span><span class="p">.</span><span class="nx">_onSubscribe</span><span class="p">,</span>
<span class="nx">publishConfig</span><span class="o">:</span> <span class="p">{</span>
<span class="nx">broadcast</span><span class="o">:</span> <span class="mi">1</span><span class="p">,</span>
<span class="nx">emitFacade</span><span class="o">:</span> <span class="kc">true</span>
<span class="p">}</span>
<span class="p">});</span>
<span class="nx">Y</span><span class="p">.</span><span class="nx">ValueChange</span> <span class="o">=</span> <span class="nx">VC</span><span class="p">;</span>
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<li class=""><a href="module_history.html" title="history">history</a></li>
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<li class=""><a href="module_imageloader.html" title="imageloader">imageloader</a></li>
<li class=""><a href="module_intl.html" title="intl">intl</a></li>
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<li class=""><a href="module_json.html" title="json">json</a></li>
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<li class=""><a href="module_oop.html" title="oop">oop</a></li>
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<li class=""><a href="module_plugin.html" title="plugin">plugin</a></li>
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<li class=""><a href="module_querystring.html" title="querystring">querystring</a></li>
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