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OnClientCheckAllChecked
The OnClientCheckAllChecked client-side event occurs after user clicks on the CheckAll item. The checked state of this item can be inspected form the returned DOM event object - args.get_domEvent().target.checked.
The event handler receives two parameters:
-
The instance of the listbox firing the event
-
An event arguments parameter containing the following methods:
- get_domEvent() - returns the DOM event object