Documentation for: ASP.NET Ajax Version 1.0

This documentation is for a previous version. For the current released version, see the ASP.NET Ajax documentation on MSDN.

 

 

 

 

 

 

 

Sys.UI.DomEvent addHandler Method

Provides a method to add a DOM event handler to the DOM element that exposes the event. This member is static and can be invoked without creating an instance of the class.

Syntax

Sys.UI.DomEvent.addHandler(element, eventName, handler);

Term

Definition

element

The element that exposes the event.

eventName

The name of the event.

handler

The client function that is called when the event occurs.

Remarks

Use the addHandler method to add a DOM event handler to the element that exposes the event. The eventName parameter should not include the "on" prefix. For example, specify "click" instead of "onclick".

This method can be accessed through the $addHandler shortcut method.

Example

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

CS

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">

</script>

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">
    <title>Example</title>
    <style type="text/css">
    #UpdatePanel1 { 
      width:300px; height:100px;
     }
    </style>
</head>
<body>
    <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 />
                   <asp:Button ID="Button1" runat="server" Text="Button" AccessKey="b"  />
		           <br />
                   <asp:Label ID="Label2" runat="server"></asp:Label>
                </asp:Panel>
            </ContentTemplate>
        </asp:UpdatePanel>
    </form>
</body>
</html>

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

    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>

VB

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<script runat="server">

</script>

<html xmlns="http://www.w3.org/1999/xhtml">

<head id="Head1" runat="server">
    <title>Example</title>
    <style type="text/css">
    #UpdatePanel1 { 
      width:300px; height:100px;
     }
    </style>
</head>
<body>
    <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 />
                   <asp:Button ID="Button1" runat="server" Text="Button" AccessKey="b"  />
		           <br />
                   <asp:Label ID="Label2" runat="server"></asp:Label>
                </asp:Panel>
            </ContentTemplate>
        </asp:UpdatePanel>
    </form>
</body>
</html>

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

    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>