Missing content after pageloads

[Morten]

Hi,

I'm new to Telerik, and thus I'm trying out some of your examples to familiarize myself.

I only downloaded the dll's, and added the axd to my existing web.config. Following, I've tried to incorporate a number of different demos into my website. I can make them work on the initial page load, but using paging results in an empty control after pageload. The simplest instance I've tried is:

http://demos.telerik.com/aspnet-ajax/grid/examples/programming/simplebinding/defaultcs.aspx

Inserted the exact same RadScriptManager, RadAjaxManager and RadGrid into my aspx, and added the codebehind - only changed the query and connectionstring.

First pageload works, but after trying to go to any other page (there's 50 pages of records), it results in an empty rad grid container:

<div id="phcontent_0_phcontent_0_RadGrid1Panel" style="display: block; ">
  <div id="phcontent_0_RadGrid1" class="RadGrid RadGrid_Default" style="width:97%;"
  <!-- 2011.2.712.35 -->
  <input id="phcontent_0_RadGrid1_ClientState" name="phcontent_0_RadGrid1_ClientState" type="hidden" autocomplete="off">
  </div>
</div>

There are no javascript errors, and the call to Telerik.Web.UI.WebResource.axd?_TSM_HiddenField_=phcontent_0_RadScriptManager1_TSM&compress=1&_TSM_CombinedScripts_=%3b

has the content

if(typeof(Sys)!=='undefined')Sys.Application.notifyScriptLoaded();
(function() {
      function loadHandler() {
          var hf = $get('phcontent_0_RadScriptManager1_TSM');
          if (!hf) return;
          if (!hf._RSM_init) { hf._RSM_init = true; hf.value = ''; }
          hf.value += ';';                                    
          Sys.Application.remove_load(loadHandler);
      };
      Sys.Application.add_load(loadHandler);
  })();

Does anyone have an idea as to what I'm doing wrong?

[Sebastian]

Hello Morten,

Do you load the data in the grid (intercepting the OnPageIndexChanged event) as presented in the example? If you do not, this can result in an empty grid when you change the active page.

An alternative solution (which will spare you some coding) would be to use advanced binding with NeedDataSource event handling as illustrated here.

Regards,
Sebastian
the Telerik team

[Morten]

Hi Sebastian,

I can try the NeedDataSource later, but as for intercepting the OnPageIndexChanged event, I've implemented it exactly as in the test, copy paste from my code :

aspx:

<telerik:RadGrid ID="RadGrid1" OnSortCommand="RadGrid1_SortCommand" OnPageIndexChanged="RadGrid1_PageIndexChanged" Width="90%"
   OnPageSizeChanged="RadGrid1_PageSizeChanged" AllowSorting="True" PageSize="15" AllowPaging="True" AllowMultiRowSelection="True" runat="server" Gridlines="None">
    <MasterTableView Width="90%" Summary="RadGrid table" />
    <PagerStyle Mode="NextPrevAndNumeric" />
</telerik:RadGrid>

C#:

protected void RadGrid1_PageIndexChanged(object source, Telerik.Web.UI.GridPageChangedEventArgs e)
        {
            LoadData();
        }

When attaching to the process, I see that Page_Load is entered, but nothing is done due to postback, however RadGrid1_PageIndexChanged (or any of the other functions for that matter) is never entered.

I have tried with AutoEventWireup true and false, with no difference.

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="TelerikTest.ascx.cs" Inherits="DanskMetal.AccessToWeb.Web.TelerikTest" %>

[Morten]

The other solution you proposed with NeedDataSource works fine, thanks :)