如何从 JSF 支持 bean 向特定组件添加消息 [英] How to add a message to a specific component from JSF backing bean
问题描述
我有一个 h:inputText 和一个 h:message 连接到它:
I have an h:inputText and an h:message connected to it:
<h:inputText id="myText" value="#{myController.myText}" />
<a4j:outputPanel>
<h:message for="myText" .../>
</a4j:outputPanel>
我想从java向它发送一条消息，方式如下:
I want to send a message to it from java, in a manner like:
FacesContext.getCurrentInstance().addMessage(arg0, arg1);
发送到 h:messages，但以特定形式发送到特定 id.我怎样才能做到这一点?(不实现验证 bean 或验证方法 - 意味着不抛出验证异常).
which is sent to h:messages, but to a specific id in a specific form. How can I do this? (Without implementing validation bean or validation method - meaning without throwing validation exception).
推荐答案
您需要提供所谓的 client id，您可以在 UIComponent 上找到它.
You need to provide the so called client id, which you'll find on UIComponent.
以下是如何使用它的快速示例.
The following is a quick example of how to use this.
考虑以下 bean:
@ManagedBean
@RequestScoped
public class ComponentMsgBean {
private UIComponent component;
public UIComponent getComponent() {
return component;
}
public void setComponent(UIComponent component) {
this.component = component;
}
public String doAction() {
FacesContext context = FacesContext.getCurrentInstance();
context.addMessage(component.getClientId(), new FacesMessage("Test msg"));
return "";
}
}
用于以下 Facelet:
being used on the following Facelet:
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
>
<h:body>
<h:form>
<h:outputText id="test" value="test component" binding="#{componentMsgBean.component}"/>
<h:message for="test"/>
<h:commandButton value="click me" action="#{componentMsgBean.doAction}" />
</h:form>
</h:body>
</html>
这将为示例中使用的 outputText 组件添加内容为Test msg"的 Faces 消息.
This will add a Faces message with content "Test msg" for the outputText component used in the example.
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