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Opening the dropdown fails to fire ItemsRequested while EnableLoadOnDemand is true...

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ComboBox

This is a migrated thread and some comments may be shown as answers.

Allen Smothers asked on 12 Nov 2009, 03:50 PM

Hello,

I'm having an issue with the Load-on-demand functionality of the RadComboBox. I've set EnableLoadOnDemand="true" and have added OnItemsRequested="cbo1ItemsRequested" event. The event gets fired if text is typed inside the dropdown box. However, when I attempt to open the combobox via the arrow the event fails to fire and I'm left with an empty selection set.

Here is a copy of my aspx code:

                    <telerik:RadComboBox ID="cbo1" AutoPostBack="True" EnableViewState="False" Width="30em"            
               Font-Size="13px"  OnSelectedIndexChanged="cbo1_SelectedIndexChanged"         
               CausesValidation="false" OnPreRender="cbo1_PreRender" runat="server" Font-Bold="True"         
               HighlightTemplatedItems="True" MarkFirstMatch="true" EnableLoadOnDemand="true" OnItemsRequested="cbo1_ItemsRequested">         
               <CollapseAnimation Duration="200" Type="OutQuint" />         
                  <ItemTemplate>         
                     <table width="100%" cellpadding="0" cellspacing="0">         
                        <tr>         
                          <td>         
                             <asp:Label ID="lblName" Font-Size="larger" Font-Bold="true" runat="server"         
                                Text='<%# DataBinder.Eval(Container.DataItem, "EntityName") %>' />         
                          </td>         
                          <td style="text-align: right">         
                             <asp:Panel ID="pnlImage" runat="server">         
                                <asp:Image ID="imgForward" runat="server" ImageUrl="../images/icons/forward.gif" />         
                             </asp:Panel>         
                          </td>         
                       </tr>         
                   </table>         
               </ItemTemplate>         
            </telerik:RadComboBox>         

Any ideas?

Thanks,

Allen

3 Answers, 1 is accepted

answered on 12 Nov 2009, 09:19 PM

I've decide to forgo trying to use the EnableLoadOnDemand capabilities and instead try to load the dropdown when the user simply clicks on the dropdown's text or arrow.

This is my current plan of attack that seems to be failing...

I have a dropdown that I'm adding a single item and assigning on page load. When the user click's on the dropdown I'm using an AjaxRequest to then populate the dropdown with the "On Demand" portion of the data.

In the Page_Load event I'm doing this...

                    RadAjaxManager ajaxProxy = RadAjaxManager.GetCurrent(Page);         
            ajaxProxy.AjaxRequest += new RadAjaxControl.AjaxRequestDelegate(ajaxProxy_AjaxRequest);         
                     
            cboHEs.Attributes.Add("OnClick", RadAjaxManager.GetCurrent(Page).GetAjaxEventReference(cboHEs.ClientID));         

Then I'm attempting to do populate the dropdown in the AjaxRequest event...

                    protected void ajaxProxy_AjaxRequest(object sender, Telerik.Web.UI.AjaxRequestEventArgs evt)         
            {         
                if (evt.Argument == cboHEs.ClientID)         
                    LoadHEs();         
            }         

Any ideas or suggestions?

Thanks again,

Allen