public interface Event
Event
interface is used to provide contextual information
about an event to the handler processing the event. An object which
implements the Event
interface is generally passed as the
first parameter to an event handler. More specific context information is
passed to event handlers by deriving additional interfaces from
Event
which contain information directly relating to the
type of event they accompany. These derived interfaces are also
implemented by the object passed to the event listener.
See also the Document Object Model (DOM) Level 2 Events Specification.
Modifier and Type | Field and Description |
---|---|
static short |
AT_TARGET
The event is currently being evaluated at the target
EventTarget . |
static short |
BUBBLING_PHASE
The current event phase is the bubbling phase.
|
static short |
CAPTURING_PHASE
The current event phase is the capturing phase.
|
Modifier and Type | Method and Description |
---|---|
boolean |
getBubbles()
Used to indicate whether or not an event is a bubbling event.
|
boolean |
getCancelable()
Used to indicate whether or not an event can have its default action
prevented.
|
EventTarget |
getCurrentTarget()
Used to indicate the
EventTarget whose
EventListeners are currently being processed. |
short |
getEventPhase()
Used to indicate which phase of event flow is currently being
evaluated.
|
EventTarget |
getTarget()
Used to indicate the
EventTarget to which the event was
originally dispatched. |
long |
getTimeStamp()
Used to specify the time (in milliseconds relative to the epoch) at
which the event was created.
|
String |
getType()
The name of the event (case-insensitive).
|
void |
initEvent(String eventTypeArg,
boolean canBubbleArg,
boolean cancelableArg)
The
initEvent method is used to initialize the value of an
Event created through the DocumentEvent
interface. |
void |
preventDefault()
If an event is cancelable, the
preventDefault method is
used to signify that the event is to be canceled, meaning any default
action normally taken by the implementation as a result of the event
will not occur. |
void |
stopPropagation()
The
stopPropagation method is used prevent further
propagation of an event during event flow. |
static final short CAPTURING_PHASE
static final short AT_TARGET
EventTarget
.static final short BUBBLING_PHASE
String getType()
EventTarget getTarget()
EventTarget
to which the event was
originally dispatched.EventTarget getCurrentTarget()
EventTarget
whose
EventListeners
are currently being processed. This is
particularly useful during capturing and bubbling.short getEventPhase()
boolean getBubbles()
boolean getCancelable()
long getTimeStamp()
timeStamp
may
be not available for all events. When not available, a value of 0
will be returned. Examples of epoch time are the time of the system
start or 0:0:0 UTC 1st January 1970.void stopPropagation()
stopPropagation
method is used prevent further
propagation of an event during event flow. If this method is called
by any EventListener
the event will cease propagating
through the tree. The event will complete dispatch to all listeners
on the current EventTarget
before event flow stops. This
method may be used during any stage of event flow.void preventDefault()
preventDefault
method is
used to signify that the event is to be canceled, meaning any default
action normally taken by the implementation as a result of the event
will not occur. If, during any stage of event flow, the
preventDefault
method is called the event is canceled.
Any default action associated with the event will not occur. Calling
this method for a non-cancelable event has no effect. Once
preventDefault
has been called it will remain in effect
throughout the remainder of the event's propagation. This method may
be used during any stage of event flow.void initEvent(String eventTypeArg, boolean canBubbleArg, boolean cancelableArg)
initEvent
method is used to initialize the value of an
Event
created through the DocumentEvent
interface. This method may only be called before the
Event
has been dispatched via the
dispatchEvent
method, though it may be called multiple
times during that phase if necessary. If called multiple times the
final invocation takes precedence. If called from a subclass of
Event
interface only the values specified in the
initEvent
method are modified, all other attributes are
left unchanged.eventTypeArg
- Specifies the event type. This type may be any
event type currently defined in this specification or a new event
type.. The string must be an XML name. Any new event type must not
begin with any upper, lower, or mixed case version of the string
"DOM". This prefix is reserved for future DOM event sets. It is
also strongly recommended that third parties adding their own
events use their own prefix to avoid confusion and lessen the
probability of conflicts with other new events.canBubbleArg
- Specifies whether or not the event can bubble.cancelableArg
- Specifies whether or not the event's default
action can be prevented. 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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