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184 lines
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12 KiB
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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>YAHOO.ext.util.Observable</title>
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<div class="top-tools"><img src="../resources/print.gif" width="16" height="16" align="absmiddle"> <a href="YAHOO.ext.util.Observable.html" target="_blank">Print Friendly</a></div>
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<h1>Class YAHOO.ext.util.Observable</h1>
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<table cellspacing="0">
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<tr><td class="label">Package:</td><td>YAHOO.ext.util</td></tr>
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<tr><td class="label">Class:</td><td>Observable</td></tr>
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<tr><td class="label">Extends:</td><td>Object</td></tr>
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<tr><td class="label">Subclasses:</td><td><a href="YAHOO.ext.BasicDialog.html">BasicDialog</a>, <a href="YAHOO.ext.ContentPanel.html">ContentPanel</a>, <a href="YAHOO.ext.LayoutManager.html">LayoutManager</a>, <a href="YAHOO.ext.LayoutRegion.html">LayoutRegion</a>, <a href="YAHOO.ext.Resizable.html">Resizable</a>, <a href="YAHOO.ext.SplitBar.html">SplitBar</a>, <a href="YAHOO.ext.TabPanel.html">TabPanel</a>, <a href="YAHOO.ext.TabPanelItem.html">TabPanelItem</a>, <a href="YAHOO.ext.UpdateManager.html">UpdateManager</a>, <a href="YAHOO.ext.View.html">View</a>, <a href="YAHOO.ext.grid.AbstractColumnModel.html">AbstractColumnModel</a>, <a href="YAHOO.ext.grid.AbstractDataModel.html">AbstractDataModel</a>, <a href="YAHOO.ext.grid.DefaultSelectionModel.html">DefaultSelectionModel</a>, <a href="YAHOO.ext.grid.Grid.html">Grid</a></td></tr>
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<tr><td class="label">Defined In:</td><td><a href="yutil.js.html">yutil.js</a></td></tr>
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</table>
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<div class="description">
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Abstract base class that provides a common interface for publishing events. Subclasses are expected to
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to have a property "events" with all the events defined.<br>
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For example:
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<pre><code>
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var Employee = function(name){
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this.name = name;
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this.events = {
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'fired' : new YAHOO.util.CustomEvent('fired'),
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'quit' : new YAHOO.util.CustomEvent('quit')
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}
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}
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YAHOO.extend(Employee, YAHOO.ext.util.Observable);
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</code></pre> </div>
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<hr />
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<a name="properties"></a>
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<h2>Public Properties</h2>
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<div class="no-members">This class has no public properties.</div> <a name="methods"></a>
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<h2>Public Methods</h2>
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<table cellspacing="0" class="member-table">
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<tr>
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<th class="sig-header" colspan="2">Method</th>
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<th class="msource-header">Defined By</th>
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</tr>
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<tr>
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<td class="micon" rowspan="2"> </td>
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<td class="sig"><a class="mlink" href="#addListener">addListener</a>(<code>String eventName</code>, <code>Function handler</code>, <span class="optional" title="Optional">[<code>Object scope</code>]</span>, <span class="optional" title="Optional">[<code>boolean override</code>]</span>) : void</td>
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<td class="msource" rowspan="2">Observable</td>
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</tr>
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<tr>
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<td class="mdesc">Appends an event handler to this element</td>
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</tr>
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<tr class="alt">
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<td class="micon" rowspan="2"> </td>
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<td class="sig"><a class="mlink" href="#delayedListener">delayedListener</a>(<code>String eventName</code>, <code>Function handler</code>, <span class="optional" title="Optional">[<code>Object scope</code>]</span>, <span class="optional" title="Optional">[<code>Number delay</code>]</span>) : Function</td>
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<td class="msource" rowspan="2">Observable</td>
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</tr>
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<tr class="alt">
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<td class="mdesc">Appends an event handler to this element that is delayed the specified number of milliseconds.</td>
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</tr>
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<tr>
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<td class="micon" rowspan="2"> </td>
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<td class="sig"><a class="mlink" href="#fireEvent">fireEvent</a>(<code>String eventName</code>, <code>Object... args</code>) : Boolean</td>
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<td class="msource" rowspan="2">Observable</td>
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</tr>
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<tr>
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<td class="mdesc">Fires the specified event with the passed parameters (minus the event name).</td>
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</tr>
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<tr class="alt">
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<td class="micon" rowspan="2"> </td>
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<td class="sig"><a class="mlink" href="#purgeListeners">purgeListeners</a>() : void</td>
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<td class="msource" rowspan="2">Observable</td>
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</tr>
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<tr class="alt">
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<td class="mdesc">Removes all listeners for this object</td>
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</tr>
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<tr>
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<td class="micon" rowspan="2"> </td>
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<td class="sig"><a class="mlink" href="#removeListener">removeListener</a>(<code>String eventName</code>, <code>Function handler</code>, <span class="optional" title="Optional">[<code>Object scope</code>]</span>) : void</td>
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<td class="msource" rowspan="2">Observable</td>
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</tr>
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<tr>
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<td class="mdesc">Removes a listener</td>
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</tr>
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</table>
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<a name="events"></a>
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<h2>Public Events</h2>
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<div class="no-members">This class has no public events.</div>
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<h2 class="mdetail-head">Method Details</h2>
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<div class="detail-wrap">
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<a name="addListener"></a>
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<div class="mdetail">
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<h3>addListener</i></h3>
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<code>public function addListener(<code>String eventName</code>, <code>Function handler</code>, <span class="optional" title="Optional">[<code>Object scope</code>]</span>, <span class="optional" title="Optional">[<code>boolean override</code>]</span>)</code>
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<div class="mdetail-desc">
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Appends an event handler to this element
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<div class="mdetail-params">
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<strong>Parameters:</strong>
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<ul><li><code>eventName</code> : String<div class="sub-desc">The type of event to listen for</div></li><li><code>handler</code> : Function<div class="sub-desc">The method the event invokes</div></li><li><code>scope</code> : Object<div class="sub-desc">(optional) The scope (this object) for the handler</div></li><li><code>override</code> : boolean<div class="sub-desc">(optional) If true, scope becomes the scope</div></li> </ul>
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<strong>Returns:</strong>
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<ul>
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<li><code>void</code></li>
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</ul>
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</div>
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</div>
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<div class="mdetail-def">This method is defined by Observable.</div>
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</div>
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<a name="delayedListener"></a>
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<div class="mdetail alt">
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<h3>delayedListener</i></h3>
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<code>public function delayedListener(<code>String eventName</code>, <code>Function handler</code>, <span class="optional" title="Optional">[<code>Object scope</code>]</span>, <span class="optional" title="Optional">[<code>Number delay</code>]</span>)</code>
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<div class="mdetail-desc">
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Appends an event handler to this element that is delayed the specified number of milliseconds.
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<div class="mdetail-params">
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<strong>Parameters:</strong>
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<ul><li><code>eventName</code> : String<div class="sub-desc">The type of event to listen for</div></li><li><code>handler</code> : Function<div class="sub-desc">The method the event invokes</div></li><li><code>scope</code> : Object<div class="sub-desc">(optional) The scope (this object) for the handler</div></li><li><code>delay</code> : Number<div class="sub-desc">(optional) The number of milliseconds to delay</div></li> </ul>
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<strong>Returns:</strong>
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<ul>
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<li><code>Function</code><div class="sub-desc">The wrapped function that was created (can be used to remove the listener)</div></li>
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</ul>
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</div>
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</div>
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<div class="mdetail-def">This method is defined by Observable.</div>
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</div>
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<a name="fireEvent"></a>
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<div class="mdetail">
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<h3>fireEvent</i></h3>
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<code>public function fireEvent(<code>String eventName</code>, <code>Object... args</code>)</code>
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<div class="mdetail-desc">
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Fires the specified event with the passed parameters (minus the event name).
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<div class="mdetail-params">
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<strong>Parameters:</strong>
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<ul><li><code>eventName</code> : String<div class="sub-desc"></div></li><li><code>args</code> : Object...<div class="sub-desc">Variable number of parameters are passed to handlers</div></li> </ul>
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<strong>Returns:</strong>
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<ul>
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<li><code>Boolean</code><div class="sub-desc">returns false if any of the handlers return false otherwise it returns true</div></li>
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</ul>
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</div>
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</div>
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<div class="mdetail-def">This method is defined by Observable.</div>
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</div>
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<a name="purgeListeners"></a>
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<div class="mdetail alt">
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<h3>purgeListeners</i></h3>
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<code>public function purgeListeners()</code>
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<div class="mdetail-desc">
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Removes all listeners for this object
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<div class="mdetail-params">
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<strong>Parameters:</strong>
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<ul><li>None.</li> </ul>
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<strong>Returns:</strong>
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<ul>
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<li><code>void</code></li>
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</ul>
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</div>
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</div>
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<div class="mdetail-def">This method is defined by Observable.</div>
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</div>
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<a name="removeListener"></a>
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<div class="mdetail">
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<h3>removeListener</i></h3>
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<code>public function removeListener(<code>String eventName</code>, <code>Function handler</code>, <span class="optional" title="Optional">[<code>Object scope</code>]</span>)</code>
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<div class="mdetail-desc">
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Removes a listener
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<div class="mdetail-params">
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<strong>Parameters:</strong>
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<ul><li><code>eventName</code> : String<div class="sub-desc">The type of event to listen for</div></li><li><code>handler</code> : Function<div class="sub-desc">The handler to remove</div></li><li><code>scope</code> : Object<div class="sub-desc">(optional) The scope (this object) for the handler</div></li> </ul>
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<strong>Returns:</strong>
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<ul>
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<li><code>void</code></li>
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</ul>
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</div>
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</div>
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<div class="mdetail-def">This method is defined by Observable.</div>
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</div>
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</div>
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</div>
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<hr>
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Copyright © 2006 Jack Slocum. All rights reserved.
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</html>
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