EventTarget JDK 1.6)

Description

public interface EventTarget

The EventTarget interface is implemented by all Nodes in an implementation which supports the DOM Event Model.

The EventTarget interface is implemented by all Nodes in an implementation which supports the DOM Event Model. Therefore, this interface can be obtained by using binding-specific casting methods on an instance of the Node interface. The interface allows registration and removal of EventListeners on an EventTarget and dispatch of events to that EventTarget.

See also:

Methods

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public void addEventListener (String type, EventListener listener, boolean useCapture)

This method allows the registration of event listeners on the event target.

This method allows the registration of event listeners on the event
target. If an EventListener is added to an
EventTarget while it is processing an event, it will not
be triggered by the current actions but may be triggered during a
later stage of event flow, such as the bubbling phase.

If multiple identical EventListeners 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.
Parameters:
- type - The event type for which the user is registering
- listener - The listener parameter takes an interface implemented by the user which contains the methods to be called when the event occurs.
- 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.

public boolean dispatchEvent (Event evt) throws EventException

This method allows the dispatch of events into the implementations event model.

This method allows the dispatch of events into the implementations
event model. Events dispatched in this manner will have the same
capturing and bubbling behavior as events dispatched directly by the
implementation. The target of the event is the
EventTarget on which dispatchEvent is
called.
Returns: The return value of dispatchEvent indicates whether any of the listeners which handled the event called preventDefault. If preventDefault was called the value is false, else the value is true.
Parameters:
- evt - Specifies the event type, behavior, and contextual information to be used in processing the event.
Throws:
- EventException - UNSPECIFIED_EVENT_TYPE_ERR: Raised if the Event's type was not specified by initializing the event before dispatchEvent was called. Specification of the Event's type as null or an empty string will also trigger this exception.

public void removeEventListener (String type, EventListener listener, boolean useCapture)

This method allows the removal of event listeners from the event target.

This method allows the removal of event listeners from the event
target. If an EventListener is removed from an
EventTarget while it is processing an event, it will not
be triggered by the current actions. EventListeners can
never be invoked after being removed.

Calling removeEventListener with arguments which do
not identify any currently registered EventListener on
the EventTarget has no effect.
Parameters:
- type - Specifies the event type of the EventListener being removed.
- listener - The EventListener parameter indicates the EventListener to be removed.
- useCapture - Specifies whether the EventListener being removed was registered as a capturing listener or not. If a listener was registered twice, one with capture and one without, each must be removed separately. Removal of a capturing listener does not affect a non-capturing version of the same listener, and vice versa.