ValueChangeEvent (Java EE 5)

java.lang.Object
  java.util.EventObject
      javax.faces.event.FacesEvent
          javax.faces.event.ValueChangeEvent

ValueChangeEvent 通知由于用户界面活动，源组件的本地值发生了更改。只有成功完成了新值的验证，才会激发该通知。

英文文档：

A ValueChangeEvent is a notification that the local value of the source component has been change as a result of user interface activity. It is not fired unless validation of the new value was completed successfully.

See Also:

Serialized Form

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Field Summary

 

Fields inherited from class java.util.EventObject
source

 

Constructor Summary
ValueChangeEvent(UIComponent component, Object oldValue, Object newValue)           Construct a new event object from the specified source component, old value, and new value.

 

Method Summary
Object	getNewValue()           Return the current local value of the source UIComponent.
Object	getOldValue()           Return the previous local value of the source UIComponent.
boolean	isAppropriateListener(FacesListener listener)           Return true if this FacesListener is an instance of a listener class that this event supports.
void	processListener(FacesListener listener)           Broadcast this FacesEvent to the specified FacesListener, by whatever mechanism is appropriate.

 

Methods inherited from class javax.faces.event.FacesEvent
getComponent, getPhaseId, queue, setPhaseId

 

Methods inherited from class java.util.EventObject
getSource, toString

 

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

 

Constructor Detail

public ValueChangeEvent(UIComponent component, Object oldValue, Object newValue)

根据指定的源组件、旧值和新值构造一个新的事件对象。

此事件的默认 PhaseId 为 PhaseId#ANY_PHASE。

component	此事件的源 UIComponent
oldValue	此 UIComponent 以前的本地值
newValue	此 UIComponent 的新本地值
Throws	IllegalArgumentException: 如果 component 为 null

英文文档：

ValueChangeEvent

public ValueChangeEvent(UIComponent component,
                        Object oldValue,
                        Object newValue)

Construct a new event object from the specified source component, old value, and new value.

The default PhaseId for this event is PhaseId.ANY_PHASE.

Parameters:

component - Source UIComponent for this event

oldValue - The previous local value of this UIComponent

newValue - The new local value of thie UIComponent

Throws:

IllegalArgumentException - if component is null

Method Detail

public Object getOldValue()

返回源 UIComponent 以前的本地值。

英文文档：

getOldValue

public Object getOldValue()

Return the previous local value of the source UIComponent.

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public Object getNewValue()

返回源 UIComponent 的当前本地值。

英文文档：

getNewValue

public Object getNewValue()

Return the current local value of the source UIComponent.

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public boolean isAppropriateListener(FacesListener listener)

英文文档：

isAppropriateListener

public boolean isAppropriateListener(FacesListener listener)

Description copied from class: FacesEvent

Return true if this FacesListener is an instance of a listener class that this event supports. Typically, this will be accomplished by an "instanceof" check on the listener class.

Specified by:

isAppropriateListener in class FacesEvent

Parameters:

listener - FacesListener to evaluate

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public void processListener(FacesListener listener)

Throws

AbortProcessingException: NullPointerException 通知 JavaServer Face 实现不应该继续处理当前事件

英文文档：

processListener

public void processListener(FacesListener listener)

Description copied from class: FacesEvent

Broadcast this FacesEvent to the specified FacesListener, by whatever mechanism is appropriate. Typically, this will be accomplished by calling an event processing method, and passing this FacesEvent as a paramter.

Specified by:

processListener in class FacesEvent

Parameters:

listener - FacesListener to send this FacesEvent to

Throws:

AbortProcessingException - Signal the JavaServer Faces implementation that no further processing on the current event should be performed

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