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Sys.UI.DomEvent $addHandler Method

.NET Framework 4

.NET Framework 3.5

Provides a shortcut to the addHandler method of the Sys.UI.DomEvent class. This member is static and can be invoked without creating an instance of the class.

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$addHandler(element, eventName, handler, autoRemove);

Parameters

Term	Definition
element	The DOM element that exposes the event.
eventName	The name of the event.
handler	The event handler to add.
autoRemove	(Optional) A boolean value that determines whether the handler should be removed automatically when the element is disposed.

Remarks

For details about the method that this shortcut represents, see Sys.UI.DomEvent addHandler Method.

Example

The following example shows how to associate an event handler with an element by using the $addHandler shortcut method.

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<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html >

<head id="Head1" runat="server">
    <title>$addHandler Example</title>
    <style type="text/css">
    #UpdatePanel1 { 
      width:300px; height:100px;
     }
    </style>
</head>
<body>
	<h1>$addHandler Example</h1>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server"/>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server" ChildrenAsTriggers="False" UpdateMode="Conditional">
            <ContentTemplate>
                <asp:Panel ID="Panel1" runat="server" GroupingText="Update Panel">
                   <asp:Label ID="Label1" runat="server" Text="Click button to see event details."></asp:Label>
                   <br /><br />
                   <asp:Button ID="Button1" runat="server" Text="Button" AccessKey="b"  />
                   <br /><br />
                   <asp:Label ID="Label2" runat="server"></asp:Label>
                </asp:Panel>
            </ContentTemplate>
        </asp:UpdatePanel>
    </form>
</body>
</html>

<script type="text/javascript">
    $addHandler($get("Button1"), "click", processEventInfo);
    var myArray = ['altKey', 'button', 'charCode', 'clientX', 'clientY',
                   'ctrlKey', 'offsetX', 'offsetY', 'screenX', 'screenY', 
                   'shiftKey', 'target', 'type'];

    // Event handler displays element properties specified in array
    function processEventInfo(eventElement) {
        var result = '';
        for (var i = 0, l = myArray.length; i < l; i++) {
            var arrayVal = myArray[i];
            if (typeof(arrayVal) !== 'undefined') {
                // Example: eventElement.clientX
                result += arrayVal + " = " + eval("eventElement." + arrayVal) + '<br/>';
            }
        }
        $get('Label2').innerHTML = result;
    }
 </script>

Reference

Sys.UI.DomEvent Class

Other Resources

Language Reference

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