[Solved] RadAjaxPanel - script controls cannot be registered before prerender

[AlanP]

Hi,

I receive the following error:

invalid operation exception

error message  = script controls cannot be registered before prerender

   at System.Web.UI.ScriptControlManager.RegisterScriptControl[TScriptControl](TScriptControl scriptControl)
   at System.Web.UI.ScriptManager.RegisterScriptControl[TScriptControl](TScriptControl scriptControl)
   at Telerik.Web.UI.RadAjaxPanel.OnPreRender(EventArgs e)
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Control.PreRenderRecursiveInternal()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

when referencing the following page:

     <%@ Page Language="vb" AutoEventWireup="false" MasterPageFile="../StandardTemplate.master" CodeBehind="CheckReq.aspx.vb" Inherits="Asi.AP.Web.CheckReq" %>

<asp:Content id="body" contentPlaceHolderID="body" runat="server">
     <asp:ScriptManager ID="ScriptManager1" runat="server"/>


    <telerik:RadAjaxPanel id="ajaxPanel" width="95%" runat="server" >
         <asp:Button id="complete" style="display:none" runat="server" />

         <asp:Panel id="validationSummaryPanel" visible="false" runat="server" >
                <spring:ValidationSummary id="validationSummary" runat="server" />
         </asp:Panel>

          <radts:RadTabStrip id="RadTabStrip1" runat="server" skinspath="/lxr2005/asi.ap.web/web/images/radskins/radtabstrip"
          Skin="Office2007" MultiPageID="RadMultiPage1"
                    SelectedIndex="0">
                <Tabs>
                    <radts:Tab Text="Check Request" ></radts:Tab>
                    <radts:Tab Text="Allocations" ></radts:Tab>
                </Tabs>
           </radts:RadTabStrip>

           <radts:RadMultiPage ID="RadMultiPage1" width="95%" SelectedIndex="0" runat="server">

               <radts:PageView ID="PV1" runat="server">


                    <asi:ItemList id="L0" runat="server" />


               </radts:PageView>

               <radts:PageView ID="PageView1" runat="server">

                   <asi:AllocationGrid id="AG"  runat="server" />

               </radts:PageView>

           </radts:RadMultiPage>

        <asi:ActionBar id="actionBar"  runat="server" />

    </telerik:RadAjaxPanel>

</asp:Content>

The ItemList control is the problem. This control is a server control that creates many nested controls based on an xml definition. When I nest this control inside an asp:Panel, the problem goes away. However, when building the radstrip and pageviews in code, the problem remains even if I nest the ItemList in a Panel,  so it seems that there is a subtle difference between asp.net creation and building the controls at page init. What is the root problem here?

Thanks,

Alan Polk

[Steve]

Hello AlanP,

Can you verify that this works properly when using asp:UpdatePanel? RadAjax Prometheus is built on top of MS AJAX and if this is not supported by it - it would not work with our Ajax either.

Greetings,
Steve
the Telerik team

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