OnClientDockPositionChanging
The OnClientDockPositionChanging client-side event occurs when the user tries to drop the RadDock control in a new location. If the new location is inside a docking zone, the docking zone shows a placeholder at this point, but has not yet docked the RadDock control.
The event handler receives two parameters:
The instance of the RadDock control that has just been dragged.
-
An eventArgs parameter containing the following methods:
- set_cancel lets you prevent the control from moving to the new location. If you call set_cancel(true), the RadDock control snaps back to its starting point, and no further events occur.
- get_cancel returns a boolean value indicating whether the drop operation was cancelled.
The following example uses the OnClientDockPositionChanging event to cancel a move when a RadDock control is the last control in its old docking zone:
<script type="text/javascript">
function KeepLastDock(dock, e)
{
var id = dock.get_dockZoneID();
if (id != "")
{
var zone = $find(id);
var docks = zone.get_docks();
if (docks.length == 0)
e.set_cancel(true);
}
}
</script>
<telerik:RadDockLayout ID="RadDockLayout1" runat="server">
<telerik:RadDockZone ID="RadDockZone1" runat="server">
<telerik:RadDock
ID="RadDock1"
runat="server"
OnClientDockPositionChanging="KeepLastDock" />
<telerik:RadDock
ID="RadDock2"
runat="server"
OnClientDockPositionChanging="KeepLastDock" />
<telerik:RadDock
ID="RadDock3"
runat="server"
OnClientDockPositionChanging="KeepLastDock" />
</telerik:RadDockZone>
<telerik:RadDockZone ID="RadDockZone2" runat="server" >
</telerik:RadDockZone>
</telerik:RadDockLayout>