ValueChangeEvent (Java EE 5 SDK)

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Java EE 5 SDK

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摘要: 嵌套 | 字段 | 构造器 | 方法

详细信息: 字段 | 构造器 | 方法

javax.faces.event Class ValueChangeEvent

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

所有已实现的接口:: 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.

另请参见:: Serialized Form

字段摘要

Fields inherited from class java.util.EventObject
`source`

构造器摘要
`ValueChangeEvent(UIComponent component, Object oldValue, Object newValue)` Construct a new event object from the specified source component, old value, and new value.

方法摘要
`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.

类方法继承 javax.faces.event.FacesEvent
`getComponent, getPhaseId, queue, setPhaseId`

类方法继承 java.util.EventObject
`getSource, toString`

类方法继承 java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

构造器详细信息

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.

参数:: component - Source UIComponent for this event; oldValue - The previous local value of this UIComponent; newValue - The new local value of thie UIComponent
抛出异常:: IllegalArgumentException - if component is null

方法详细信息

getOldValue

public Object getOldValue()

Return the previous local value of the source UIComponent.

getNewValue

public Object getNewValue()

Return the current local value of the source UIComponent.

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.

规范说明:: isAppropriateListener in class FacesEvent

参数:: listener - FacesListener to evaluate

processListener

public void processListener(FacesListener listener)