Event (Common DOM API) - Java 2 SDK v1.4.2, Java 2 SDK 英文文档

Overview

Package

Class

Use

Tree

Deprecated

Index

Help

Common DOM API

PREV CLASS NEXT CLASS

FRAMES NO FRAMES

SUMMARY: NESTED | FIELD | CONSTR | METHOD

DETAIL: FIELD | CONSTR | METHOD

org.w3c.dom.events
Interface Event

All Known Subinterfaces:: MouseEvent, MutationEvent, UIEvent

public interface Event

The 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.

Since:: DOM Level 2

Field Summary

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.

Method Summary

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.

Field Detail

CAPTURING_PHASE

public static final short CAPTURING_PHASE

The current event phase is the capturing phase.

See Also:: Constant Field Values

AT_TARGET

public static final short AT_TARGET

The event is currently being evaluated at the target EventTarget.

See Also:: Constant Field Values

BUBBLING_PHASE

public static final short BUBBLING_PHASE

The current event phase is the bubbling phase.

See Also:: Constant Field Values

Method Detail

getType

public String getType()

The name of the event (case-insensitive). The name must be an XML name.

getTarget

public EventTarget getTarget()

Used to indicate the EventTarget to which the event was originally dispatched.

getCurrentTarget

public EventTarget getCurrentTarget()

Used to indicate the EventTarget whose EventListeners are currently being processed. This is particularly useful during capturing and bubbling.

getEventPhase

public short getEventPhase()

Used to indicate which phase of event flow is currently being evaluated.

getBubbles

public boolean getBubbles()

Used to indicate whether or not an event is a bubbling event. If the event can bubble the value is true, else the value is false.

getCancelable

public boolean getCancelable()

Used to indicate whether or not an event can have its default action prevented. If the default action can be prevented the value is true, else the value is false.

getTimeStamp

public long getTimeStamp()

Used to specify the time (in milliseconds relative to the epoch) at which the event was created. Due to the fact that some systems may not provide this information the value of 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.

stopPropagation

public void stopPropagation()

The 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.

preventDefault

public 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. 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.

initEvent

public 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. 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.