public interface EventTarget
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 the Document Object Model (DOM) Level 2 Events Specification.
| Modifier and Type | Method and Description | 
|---|---|
| void | addEventListener(String type,
                EventListener listener,
                boolean useCapture)This method allows the registration of event listeners on the event
 target. | 
| boolean | dispatchEvent(Event evt)This method allows the dispatch of events into the implementations
 event model. | 
| void | removeEventListener(String type,
                   EventListener listener,
                   boolean useCapture)This method allows the removal of event listeners from the event
 target. | 
void addEventListener(String type, EventListener listener, boolean useCapture)
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.
 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.type - The event type for which the user is registeringlistener - 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.void removeEventListener(String type, EventListener listener, boolean useCapture)
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.
 removeEventListener with arguments which do
 not identify any currently registered EventListener on
 the EventTarget has no effect.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.boolean dispatchEvent(Event evt) throws EventException
 EventTarget on which dispatchEvent is
 called.evt - Specifies the event type, behavior, and contextual
   information to be used in processing the event.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.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. Submit a bug or feature 
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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