Package jakarta.faces.event

Class ValueChangeEvent

java.lang.Object

java.util.EventObject

jakarta.faces.event.FacesEvent

jakarta.faces.event.ValueChangeEvent

All Implemented Interfaces:

Serializable

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

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor	Description
ValueChangeEvent(UIComponent component, Object oldValue, Object newValue)	Construct a new event object from the specified source component, old value, and new value.
ValueChangeEvent(FacesContext facesContext, UIComponent component, Object oldValue, Object newValue)	Construct a new event object from the Faces context, specified source component, old value and new value.

Method Summary

Modifier and Type	Method	Description
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 jakarta.faces.event.FacesEvent

getComponent, getFacesContext, 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 Details

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

ValueChangeEvent

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

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

The default PhaseId for this event is PhaseId.ANY_PHASE.

Parameters:

facesContext - the Faces context.

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 Details

getOldValue

public Object getOldValue()

Return the previous local value of the source UIComponent.

Returns:

the previous local value

getNewValue

public Object getNewValue()

Return the current local value of the source UIComponent.

Returns:

the current local value

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

Returns:

true if it is the appropriate instance, false otherwise.

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 Jakarta Faces implementation that no further processing on the current event should be performed