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ValueChangeEvent (Java EE 5 SDK) - Java Platform, Enterprise Edition v5.0 API Specifications

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javax.faces.event
Class ValueChangeEvent

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

All Implemented Interfaces:

Serializable

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public class ValueChangeEvent
extends FacesEvent

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

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

getOldValue

public Object getOldValue()

Return the previous local value of the source UIComponent.

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getNewValue

public Object getNewValue()

Return the current local value of the source UIComponent.

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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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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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