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Load content on demand when expanding RadSlidingPane

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Article relates to

 RadSplitter for ASP.NET AJAX

Created by

 Svetlina, Telerik


HOW-TO : Load content on demand when expanding RadSlidingPane


SOLUTION:



The scenario of loading content on demand when a RadSlidingPane is expanded is useful in cases when the content slows down the performance and it is not needed to render additional HTML. In order to implement it, you can hook up the RadSlidingPane's OnClientExpanding event and perform an AJAX request which loads the content e.g as shown below:

aspx:

<form id="form1" runat="server">
       <asp:ScriptManager ID="ScriptManager1" runat="server" />
       <script type="text/javascript">
         
       function OnClientExpanding()
       { 
            if(!sender._loaded)
            {
            $find("<%=RadAjaxPanel1.ClientID %>").ajaxRequest(); 
              sender._loaded = true;
           } 
          }
       </script>
       <telerik:RadSplitter ID="RadSplitter1" runat="server">
           <telerik:RadPane ID="RadPane1" runat="server" Width="22">
               <telerik:RadSlidingZone ID="RadSlidingZone1" runat="server">
                   <telerik:RadSlidingPane ID="RadSlidingPane1" runat="server" Title="LOD" OnClientExpanding="OnClientExpanding">
                       <telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" OnAjaxRequest="OnAjaxRequest">
                       </telerik:RadAjaxPanel>
                   </telerik:RadSlidingPane>
               </telerik:RadSlidingZone>
           </telerik:RadPane>
           <telerik:RadPane ID="RadPane2" runat="server">
           </telerik:RadPane>
       </telerik:RadSplitter>
   </form>

code-behind:

protected void OnAjaxRequest(object sender, AjaxRequestEventArgs e)
{
    RadAjaxPanel1.Controls.Add(Page.LoadControl("~/WebUserControl.ascx"));
}

You can find a sample running demo attached to the article.

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