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OnClientExpanding

The OnClientExpanding client-side event handler is called when a pane is about to be expanded. The expansion can occur because of a user action such as clicking an expand button or sliding zone tab, on page load, or as the result of a a call to a client-side method.

note

The OnClientExpanding event is supported by RadPane and RadSlidingPane . It takes the place of the deprecated OnClientBeforeExpand event.

The following two parameters are passed to the event handler:

  • sender is the pane that is about to be expanded.
  • eventArgs has the following methods:
    • set_cancel() lets you prevent the pane from being expanded.
    • get_cancel() returns whether the operation was cancelled.

The following example uses the OnClientExpanding event to show a confirmation dialog:

<script type="text/javascript">
    function confirmExpand(sender, eventArgs)
    {
        eventArgs.set_cancel(!confirm("Are you sure you want to open " + sender.get_id() + "?"));
    }
</script>
<telerik:RadSplitter RenderMode="Lightweight" runat="server" id="RadSplitter1" Orientation="Horizontal" >
 <telerik:RadPane
     runat="server"
     id="RadPane1"
     Height="80px"
    OnClientBeforeExpand="confirmExpand" >
   <telerik:RadSlidingZone runat="server" id="RadSlidingZone1" >
     <telerik:RadSlidingPane
       runat="server"
       Title="Sliding Pane 1"
       id="SlidingPane1"
       Height="50px"
       OnClientBeforeExpand="confirmExpand" >
     </telerik:RadSlidingPane>
     <telerik:RadSlidingPane
       runat="server"
       Title="Sliding Pane 2"
       id="SlidingPane2"
       Height="50px"
       OnClientBeforeExpand="confirmExpand" >
     </telerik:RadSlidingPane>
   </telerik:RadSlidingZone>
 </telerik:RadPane>
 <telerik:RadSplitBar runat="server" id="RadSplitBar1" CollapseMode="Both"  />
 <telerik:RadPane
   runat="server"
   id="RadPane2"
   Height="90px"
   OnClientBeforeExpand="confirmExpand" >
 </telerik:RadPane>
</telerik:RadSplitter>          

See Also