org.symbian.tools.wrttools.doc.WRTKit/html/WRTKit_UIElement_Class-GUID-37b82f75-720c-4f54-9769-cda18453ffa3.html
author Eugene Ostroukhov <eugeneo@symbian.org>
Tue, 30 Mar 2010 15:37:32 -0700
changeset 293 06ebebf8fbc9
parent 230 7848c135d915
permissions -rw-r--r--
Bug 2404 - Problems During Content Assist
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<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en" xml:lang="en">
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<head>
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<meta content="text/html; charset=utf-8" http-equiv="Content-Type" />
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<meta name="copyright" content="(C) Copyright 2005" />
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<meta name="DC.rights.owner" content="(C) Copyright 2005" />
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<meta content="concept" name="DC.Type" />
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<meta name="DC.Title" content="WRTKit UIElement Class" />
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<meta scheme="URI" name="DC.Relation" content="WRTKit_API_Reference-GUID-00e47c27-0a1a-443f-ae85-cf3381635170.html" />
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<meta content="XHTML" name="DC.Format" />
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<meta content="GUID-37B82F75-720C-4F54-9769-CDA18453FFA3" name="DC.Identifier" />
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<meta content="en" name="DC.Language" />
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<link href="commonltr.css" type="text/css" rel="stylesheet" />
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<title>
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WRTKit UIElement Class</title>
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</head>
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<body id="GUID-37B82F75-720C-4F54-9769-CDA18453FFA3"><a name="GUID-37B82F75-720C-4F54-9769-CDA18453FFA3"><!-- --></a>
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    <h1 class="topictitle1">
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WRTKit UIElement Class</h1>
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    <div>
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        <div class="section"><h2 class="sectiontitle">
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Description</h2>
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            <p>
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                The UIElement class is the base class for all user interface elements
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                such as views and controls. Don't instantiate UIElement directly but rather
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                use one of its subclasses.
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            </p>
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        </div>
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    </div>
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    <div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="WRTKit_API_Reference-GUID-00e47c27-0a1a-443f-ae85-cf3381635170.html">WRTKit API Reference</a></div>
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</div>
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</div>
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<div class="nested1" id="GUID-B15AF535-27D2-4C6A-9956-65EED6F40FE8"><a name="GUID-B15AF535-27D2-4C6A-9956-65EED6F40FE8"><!-- --></a>
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        <h2 class="topictitle2">
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getEventListeners()</h2>
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        <div>
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            <div class="section"><h3 class="sectiontitle">
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Syntax</h3>
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                <pre>
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[Array] UIElement.getEventListeners(void)</pre>
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            </div>
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            <div class="section"><h3 class="sectiontitle">
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Description</h3>
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                <p>
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                    Allows retrieval of the currently registered event listeners for this user interface element.
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                </p>
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            </div>
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            <div class="section"><h3 class="sectiontitle">
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Arguments</h3>
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                <p>
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                    This method does not take any arguments.
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                </p>
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            </div>
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            <div class="section"><h3 class="sectiontitle">
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Return value</h3>
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                <p>
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                    An array of event listeners currently registered to the user interface element.
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                </p>
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            </div>
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        </div>
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    </div>
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    <div class="nested1" id="GUID-5C747208-730D-4ACF-BB07-CAEF1A26CAA3"><a name="GUID-5C747208-730D-4ACF-BB07-CAEF1A26CAA3"><!-- --></a>
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        <h2 class="topictitle2">
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addEventListener()</h2>
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        <div>
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            <div class="section"><h3 class="sectiontitle">
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Syntax</h3>
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                <pre>
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[void] UIElement.addEventListener(String eventType, Function listener)</pre>
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            </div>
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            <div class="section"><h3 class="sectiontitle">
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Description</h3>
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                <p>
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                    Allows registration of a callback function to a user interface element in order to get
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                    notifications of events in the user interface element. Event registration can be done
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                    for a specific type of event or for all events.
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                </p>
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            </div>
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            <div class="section"><h3 class="sectiontitle">
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Arguments</h3>
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                <br /><ul>
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                    <li>
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                        <p>
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eventType</p>
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                            <p>
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                                The name of the event type the listener should be called for or null if
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                                all event types. The available event type names depend on the actual user
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                                interface element class that this method is caled for.
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                            </p>
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                            <p>
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                                The most common event type names are ActionPerformed for button control clicks,
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                                SelectionChanged for selection controls, FocusStateChanged for all controls to
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                                indicate that focus was gained or lost and FocusedControlChanged for views to
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                                announce that a new control has been brought into (or out of) focus.
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                            </p>
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                    </li>
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                    <li>
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                        <p>
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listener</p>
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                            <p>
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                                The function that should be called when the specified event type occurs.
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                                The function should be defined with a single argument that will receive the
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                                event object. The object has three properties: source, type and value. The
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                                source property specifies the user interface element (e.g. control) from where
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                                the event originated. The type property contains the event type name. The
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                                contents of the value property depends between event types but contains
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                                additional information about the event. For example if the value changes in
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                                a selection control then the value property contains the new value.
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                            </p>
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                    </li>
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                </ul>
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            </div>
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            <div class="section"><h3 class="sectiontitle">
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Return value</h3>
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                <p>
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                    This method does not return a value.
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                </p>
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            </div>
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        </div>
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    </div>
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    <div class="nested1" id="GUID-A39809F7-CEC7-45E9-85E4-EC1F36E255EB"><a name="GUID-A39809F7-CEC7-45E9-85E4-EC1F36E255EB"><!-- --></a>
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        <h2 class="topictitle2">
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removeEventListener()</h2>
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        <div>
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            <div class="section"><h3 class="sectiontitle">
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Syntax</h3>
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                <pre>
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[void] UIElement.removeEventListener(String eventType, Function listener)</pre>
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            </div>
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            <div class="section"><h3 class="sectiontitle">
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Description</h3>
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                <p>
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                    Allows a specific event listener to be unregistered from a user interface control.
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                </p>
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            </div>
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            <div class="section"><h3 class="sectiontitle">
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Arguments</h3>
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                <br /><ul>
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                    <li>
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                        <p>
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eventType</p>
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                            <p>
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                                The event type name of the listener that should be removed. Use the exact
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                                same event type name as when adding the event listener.
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                            </p>
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                    </li>
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                    <li>
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                        <p>
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listener</p>
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                            <p>
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                                The callback function of the listener that should be removed.
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                            </p>
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                    </li>
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                </ul>
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            </div>
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            <div class="section"><h3 class="sectiontitle">
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Return value</h3>
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                <p>
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                    This method does not return a value.
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                </p>
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            </div>
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        </div>
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    </div>
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    <div class="nested1" id="GUID-A48BCE83-38D7-4DF3-B9C1-FF9A305359BD"><a name="GUID-A48BCE83-38D7-4DF3-B9C1-FF9A305359BD"><!-- --></a>
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        <h2 class="topictitle2">
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id</h2>
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        <div>
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            <div class="section"><h3 class="sectiontitle">
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Syntax</h3>
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                <pre>
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[String] UIElement.id</pre>
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            </div>
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            <div class="section"><h3 class="sectiontitle">
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Description</h3>
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                <p>
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                    The id property is a unique identifier for the user interface element.
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                    The identifier is used for the root HTML element in the element hierarchy
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                    that defines the user interface element and is useful for example in
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                    specifying specific CSS rules for a particular user interface element.
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                    The identifier can also be used to recognize the source of an event in an
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                    event callback by accessing the id property of the source property in the
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                    event object passed to the event listener callback.
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                </p>
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            </div>
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        </div>
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    </div>
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</body>
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</html>