The onEventSelected event is fired by the JavaScript Scheduler when the event selection changes (after the default action, which is selecting/deselecting the event in the UI).
See also onEventSelect event.
DayPilot.Scheduler.onEventSelected(args)
args.e
(DayPilot.Event) - the event reference
args.change
("selected" | "deselected") - selection change
args.selected
(boolean) - current selection state (after the change)
args.ctrl
(boolean) - Ctrl key state
args.meta
(boolean) - Meta key state