ExpandEvent

Arguments for the TreeList expand and collapse events (see examples).

Name	Type	Default	Description
dataItem	any		The expanded/collapsed data item.
sender	TreeListComponent		The TreeList component that triggered the event.

Methods

isDefaultPrevented
Returns true if the event was prevented by any of its subscribers.
Returns boolean true if the default action was prevented. Otherwise, returns false.

preventDefault
Prevents the default action for a specified event. In this way, the source component suppresses the built-in behavior that follows the event.