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Sys.UI.DomEvent.$clearHandlers Method

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

$clearHandlers(element);

Term

Definition

element

The DOM element that exposes the events.

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

The following example shows how to clear all event handlers from an element by using the $clearHandlers shortcut method.

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">
    <title>$clearHandlers Example</title>
</head>
<body>
    <h1>$clearHandlers 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="Move cursor over button and click to see event types."></asp:Label>
		           <br />
                   <asp:Button ID="Button1" runat="server" Text="Button 1" AccessKey="b"  />
		           <br />
                   <asp:Label ID="Label2" runat="server"></asp:Label>
                   <br />
                   <asp:Button ID="Button2" runat="server" Text="Clear All Events" />
                </asp:Panel>
            </ContentTemplate>
        </asp:UpdatePanel>
    </form>
</body>
</html>

<script type="text/javascript">
    $addHandlers($get("Button1"), {click:processEventInfo,mouseover:processEventInfo,mouseout:processEventInfo});
    $addHandler($get("Button2"), "click", clearAllHandlers);

    // Event handler displays types for multiple events
    function processEventInfo(eventElement) {
        var result = '';
        result += eventElement.type;
        $get('Label2').innerHTML = result;
    }

    // Event handler clears all events from Button1
    function clearAllHandlers(eventElement) {
        $get('Label2').innerHTML = '';
		$clearHandlers($get("Button1"));
    }
 </script>

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