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OnClientNodePopulating
The OnClientNodePopulating client-side event occurs just before child nodes are loaded from a Client DataSource. The event can be canceled.
The event handler receives parameters:
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The RadNavigation instance that fired the event.
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Event arguments with functions:
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get_constructor() retrieves the RadNavigation instance that fired the event.
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get_cancel() returns a boolean value indicating whether the call to the Client DataSource was canceled.
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set_cancel() - call this function to specify whether the event should be canceled (true) or not (false).
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get_owner() retrieves an object that is automatically passed to the Client DataSource.