FYI: RadScriptManager registration in root web.config and ASP.NET AJAX error "ASP.NET Ajax client-side framework failed to load"

[Nathan J Pledger]

For the sake of Google ...

If you are using RadScriptManager and you are using multiple web.config files, make sure the handler is registered in the top-most web.config file, even all the files reside beneath the folder in which your child web.config file lives.

I had an /admin/web.config file (which has my RadScriptManager handlers registered)

and I had my /web.config file (which did not)

It appeared to work until I was using the WCF element of the RadTReeView (specifically, clicking on a dynamically generated node - the tree dynamically generated fine) so this was giving a false impression.

Without the root web.config file having the handler registrations, you get a "ASP.NET Ajax client-side framework failed to load." error from JavaScript.

Those registrations, again:

<?xml version="1.0"?>

<configuration>

  <system.web>

    <httpHandlers>
        <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false" />

    </httpHandlers>
  </system.web>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true" />

      <handlers>
          <add name="Telerik_Web_UI_WebResource_axd" verb="*" preCondition="integratedMode" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" />

      </handlers>
  </system.webServer>

</configuration>

Hope this helps someone.