Javascript runtime error: Sys is undefined

Question

_{Tuesday, February 26, 2019 1:52 PM}

Hi.

I am using VS 2010.

I am using script manager and update panel in my aspx page. I am getting timeout error. I tried using the below code:

<script type="text/javascript"> 
        Sys.WebForms.PageRequestManager.getInstance().add_endRequest(function (sender, args) { 
            if (args.get_error() && args.get_error().name === 'Sys.WebForms.PageRequestManagerTimeoutException') { 
                            args.set_errorHandled(true); 
            } 
        }); 
    </script> 

How to fix this?

Thanks

All replies (2)

_{Wednesday, February 27, 2019 2:10 AM ✅Answered}

Hi venkatzeus,

Where do you put your script?

If you put  in front of the form mark up, it will show this error.

// please don't put here
<script type="text/javascript"> 
            Sys.WebForms.PageRequestManager.getInstance().add_endRequest(function (sender, args) { 
                console.log("success");
            //if (args.get_error() && args.get_error().name === 'Sys.WebForms.PageRequestManagerTimeoutException') { 
            //                args.set_errorHandled(true); 
            //} 
        }); 
    </script> 
    <form id="form1" runat="server">
       
        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">

            <ContentTemplate>
                <asp:Button runat="server" Text="Button" />
            </ContentTemplate>
        </asp:UpdatePanel>
       
    </form>
     
    
</body>

Please put after the form mark up or inside the form mark up.

 <form id="form1" runat="server">
       
        <asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">

            <ContentTemplate>
                <asp:Button runat="server" Text="Button" />
            </ContentTemplate>
        </asp:UpdatePanel>
       
    </form>
        <script type="text/javascript"> 
            Sys.WebForms.PageRequestManager.getInstance().add_endRequest(function (sender, args) { 
                console.log("success");
            //if (args.get_error() && args.get_error().name === 'Sys.WebForms.PageRequestManagerTimeoutException') { 
            //                args.set_errorHandled(true); 
            //} 
        }); 
    </script> 
    
</body>

Best regards,

Ackerly Xu

_{Monday, March 4, 2019 2:08 PM}

Thanks.

That worked