'Sys' is undefined When Upgrading to ASP.NET AJAX Beta 2

Maher Al-Jendasi — Sat, 11 Nov 2006 01:08:00 GMT

When you upgrade your site to use the ASP.NET AJAX Beta 2, you must add a new HttpHandler in the web.config file. Under the <httpHandler> element in the web.config, add the following handler:

<add verb="GET" 
  path="ScriptResource.axd" 
  type="Microsoft.Web.Handlers.ScriptResourceHandler" 
  validate="false"/>

Otherwise you may receive 'Sys' is undefined error message

Using External JavaScript File with ASP.NET Ajax Extension Beta 2

Maher Al-Jendasi — Thu, 09 Nov 2006 12:15:00 GMT

I have upgraded an Ajax-enabled ASP.NET site that I'm working on to use the latest ASP.NET AJAX Extenstion Beta 2. My site use external javascript files that is being registered with the ScriptManager, like:

<asp:ScriptManager runat="server" ID="ScriptManager1">
    <Scripts>
        <asp:ScriptReference Path="~/scripts/script_file1.js" />
        <asp:ScriptReference Path="~/scripts/script_file2.js" />
    </Scripts>
</asp:ScriptManager>

After upgrading to Beta 2, any functionality that needs to use functions inside those files, was giving errors?!

After reading the "Changes between the ASP.NET AJAX (“Atlas”) CTP and the Beta 2 and RTM Releases", I come to know that every external Javascript files that being referenced from ScriptManager must have a call to Sys.Application.notifyScriptLoader; this will notify the Sys.Application that the script files has been downloaded to the client computer, so for each external .js file add the following snippet:

if(typeof(Sys) !== "undefined")
  Sys.Application.notifyScriptLoaded();

Another solution that Alessandro Gallo has blog it is to add the following snippet to the end of each .js file:

if(Sys && Sys.Application) {     
    Sys.Application.notifyScriptLoaded();
}