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:

1. The instance of the listbox firing the event

2. An event arguments parameter containing the following methods:

• get_domEvent() - returns the DOM event object