ContextCallback (Java EE 5)

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javax.faces.component Interface ContextCallback

public interface ContextCallback

一个简单的回调接口，支持在视图中对特定 UIComponent（facet 或子组件）采取操作，同时保留视图中该组件实例的任何上下文状态。

英文文档：

A simple callback interace that enables taking action on a specific UIComponent (either facet or child) in the view while preserving any contextual state for that component instance in the view.

Method Summary
`void`	`invokeContextCallback(FacesContext context, UIComponent target)` This method will be called by an implementation of `UIComponent.invokeOnComponent(javax.faces.context.FacesContext, java.lang.String, javax.faces.component.ContextCallback)` and must be passed the component with the `clientId` given as an argument to `invokeOnComponent`.

Method Detail

public void invokeContextCallback(FacesContext context, UIComponent target)

此方法将通过 `UIComponent#invokeOnComponent` 的实现调用，而且必须向此方法传递带有 `clientId` 的组件，该 `clientId` 作为 `invokeOnComponent` 的参数给定。调用此方法的时候，参数 `target` 对于视图中其祖先而言，保证处于恰当的状态。

context 此请求的 `FacesContext`。

target 通过 `clientId` 定位的 `UIComponent`，该 `clientId` 通过调用 `UIComponent#invokeOnComponent` 给定。

英文文档：
invokeContextCallback

void invokeContextCallback(FacesContext context,
                           UIComponent target)

This method will be called by an implementation of UIComponent.invokeOnComponent(javax.faces.context.FacesContext, java.lang.String, javax.faces.component.ContextCallback) and must be passed the component with the clientId given as an argument to invokeOnComponent. At the point in time when this method is called, the argument target is guaranteed to be in the proper state with respect to its ancestors in the View.

Parameters:: context - the FacesContext for this request.; target - the UIComponent that was located by clientId by a call to UIComponent.invokeOnComponent(javax.faces.context.FacesContext, java.lang.String, javax.faces.component.ContextCallback).