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OnClientCheckAllChecking
Updated over 6 months ago
The OnClientCheckAllChecking client-side event occurs when the user clicks on the CheckAll item. The checked state of this item can be inspected from the returned DOM event object - args.get_domEvent().target.checked. The event can be canceled.
The event handler receives two parameters:
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The instance of the listbox firing the event
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An event arguments parameter containing the following methods:
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set_cancel() - lets you cancel the event and prevent changing the checked state of the item.
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get_domEvent() - returns the DOM event object