EventListener
is added to an EventTarget
which is currently processing an event the new listener will not be triggered by the current event. EventListener
s are registered on the same EventTarget
with the same parameters the duplicate instances are discarded. They do not cause the EventListener
to be called twice and since they are discarded they do not need to be removed with the removeEventListener
method.
@param type The event type for which the user is registering
@param listener The listener
parameter takes an interface implemented by the user which contains the methods to be called when the event occurs.
@param useCapture If true, useCapture
indicates that the user wishes to initiate capture. After initiating capture, all events of the specified type will be dispatched to the registered EventListener
before being dispatched to any EventTargets
beneath them in the tree. Events which are bubbling upward through the tree will not trigger an EventListener
designated to use capture.
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