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Editorial Team
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Asked: 2026-05-23T21:21:16+00:00

I have the following in an ASP.NET 2.0 page. <script type=text/javascript> function pageLoad() {

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I have the following in an ASP.NET 2.0 page.

<script type="text/javascript">
function pageLoad()
{
    var manager = Sys.WebForms.PageRequestManager.getInstance();
    if (manager !=null)
    {
        debugger;
        manager.add_beginRequest(Request_Begin);
        manager.add_endRequest(Request_End);
    }
}

 function Request_Begin(sender, args)
 {
     debugger;
     ....
 }


 function Request_End(sender, args)
 {
     ....
 }
 </script>

The pageLoad is called but the code inside of Request_Begin never appears to be hit.

Any clue as to why?

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1 Answer

  1. Editorial Team

    The callbacks will be hit when you trigger an AJAX request using the Microsoft scripts (from an UpdatePanel for instance):

    <%@ Page Language="C#" %>
<!DOCTYPE html>
<html>
<head>
    <title></title>
    <script type="text/javascript">
        function pageLoad() {
            var manager = Sys.WebForms.PageRequestManager.getInstance();
            if (manager != null) {
                manager.add_beginRequest(Request_Begin);
                manager.add_endRequest(Request_End);
            }
        }

        function Request_Begin(sender, args)
        {
            debugger;
        }

        function Request_End(sender, args) {
            debugger;
        }
    </script>
</head>
<body>
    <form id="Form1" runat="server">
        <asp:ScriptManager ID="scm" runat="server" />
        <asp:UpdatePanel ID="up" runat="server">
            <ContentTemplate>
                <%= DateTime.Now.ToLongTimeString() %>
                <asp:LinkButton ID="link" runat="server" Text="update" />
            </ContentTemplate>
        </asp:UpdatePanel>
    </form>
</body>
</html>

    If you use jQuery to do your AJAX stuff forget about those being ever fired.

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