Error encountered: The object 'Sys' is not defined in the Microsoft JScript runtime

I currently have a webpage with the following code snippet:

<script type="text/javascript" language="javascript">
    /// <reference name="MicrosoftAjax.js" />

    Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);

    function EndRequestHandler(sender, args)
    {
        ToggleTimeDiv();
    }
</script>

Upon loading the page, I encounter the following error message:

  • Microsoft JScript runtime error: 'Sys' is undefined

I am working with Visual Studio 2008 Standard Edition. Can you help identify what is causing this issue?

asp.netjavascriptasp.net-ajax

Answer №1

Are you sure that your <script> block is placed before the ScriptManager in your code?

Answer №2

For optimal performance, it is recommended to place your script code towards the end of your webpage, right before the closing body tag.


   <html>

  ...
   </head>
   <body>
    <form id="form1" runat="server">
     ...
    </form>


    enter code here
     <script type="text/javascript" language="javascript">
  /// <reference name="MicrosoftAjax.js" />

  Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);

  function EndRequestHandler(sender, args)
  {
      ToggleTimeDiv();
  }
  </script>




   </body>
      </html>

Answer №3

Have you included

<asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>

right at the top of your page? I encountered a similar issue and resolved it by adding this code snippet...

Answer №4

When implementing ASP.NET routing, insert the following code snippet into your global.asax file:

    void Application_Start(object sender, EventArgs e)
    {
       RouteTable.Routes.Ignore("{resource}.axd");
    }

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