JavaScript generated menu control triggers a 'Sys undefined' error in Web Forms

I am currently working on an ASP.NET 4 web application. Upon adding a Menu control to the web form, I noticed that it triggers the generation of the following code just before the closing </form> tag:

 <script type='text/javascript'>
         new Sys.WebForms.Menu({ element: 'NavigationMenu', disappearAfter: 500, 
                orientation: 'horizontal', tabIndex: 0, disabled: false });

Everything works fine without any issues as long as I do not implement URL Rewriting. However, when I attempt to use URL Rewriting on the website, Visual Studio starts throwing a JavaScript exception stating "Sys is undefined."

This issue seems to occur most frequently when I make changes related to positioning in the CSS file, although there are instances where the exceptions appear randomly.

Is there a way to resolve this problem?

asp.netjavascript

Answer №1

To resolve my issue, I adjusted the menu's RenderingMode attribute to "Table" even though I am using a Menu Adapter to display the control with lists.

<asp:Menu ID="mnuStuff" runat="server" RenderingMode="Table">
    ...
</asp:Menu>

If you don't need the new CSS features of asp 4.0, you can prevent the injection of new Sys.WebForms.Menu by adding the following setting in the web.config file.

<system.web> 
  <pages controlRenderingCompatibilityVersion="3.5"/> 
</system.web>

This will stop the inline JavaScript rendering that asp injects at the bottom of the page.

Answer №2

Ignore the {resource}.axd route in the RouteTable configuration.

Answer №3

Although the question may be dated, I believe this solution could assist any struggling individual... ;-)

My issue was resolved by relocating all jQuery-related scripts to the bottom of the webpage. While I did not delve too deeply into the reason behind this conflict, it appears there was a clear clash in JavaScript naming between the javascript resource file (WebResource/*.axd) and jQuery (version 1.10 at the time of writing).

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