[Solved] checkboxlist in itemtemplate

[NS]

Hello,
Consider the following html code:

 <telerik:RadComboBox runat="server" AutoPostBack="true" Skin="Hay" ID="rcbEnvironments">
                <ItemTemplate>
                    <asp:CheckBoxList runat="server" DataTextField="Name" DataValueField="Id" ID="cblEnvironments" />
                </ItemTemplate>
                </telerik:RadComboBox>

How do I from codebehind databind the checkboxlist ?

If I try (checkboxlist)rcbEnvironments.FindControl("cblEnvironments"), I get a null.

Thanks,
Nicolas

[Erjan Gavalji]

Hi NS,

The template is instantiated in the context of the specific item, but not the RadComboBox control. Therefore you should use

RadComboBoxItem item = rcbEnvironments.Items[0];
CheckBoxList myList = (CheckBoxList)item.FindControl("cblEnvironments");

I hope this helps.

Kind regards,
Erjan Gavalji
the Telerik team

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[NS]

Hi,
I get a Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index at System.Collections.ArrayList.get_Item(Int32 index) exception at the line: RadComboBoxItem item = rcbEnvironments.Items[0];

Must I databind my datasource to the radcombobox ?

[NS]

Already answered my own question :-) I must indeed databind my datasource to the radcombobox first.

Nicolas

[NS]

I have some extra questions.

When I expand my radcombobox, my asp:checkboxlist appear. I want to select some items in the checkboxlist.

Problem is when I select one thing, my radcombobox collapses again. I have to expand the radcombobox to select the next thing.

Next question:
Where do I handle the selectedindexchanged of the asp:checkboxlist ? (to get all the checked items), the asp:checkboxlist is not known in codebehind because it is inside a radcombobox.

Thanks,
Nicolas

[Nikolay]

Hello NS,

1. You can hook on the OnClientSelectingIndexChanging event of the combobox and call the event arguments' set_cancel(true) method to cancel the event. Thus, the drop-down will not be closed when checking a checkbox:
   
   function OnClientSelectedIndexChanging(sender, args)
   {
      args.set_cancel(true);
   }
2. As for the selectedindexchangedof the checkbox list - you should simply hook on the event as if the checkboxlist was not in a combobox' tempate and execute your logic in the event handler

Hope this helps.

Sincerely yours,
Nick
the Telerik team

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