How to add a message to a specific component from JSF backing bean
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>
I want to send a message to it from java, in a manner like:
FacesContext.getCurrentInstance().addMessage(arg0, arg1);
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).
Answer
You need to provide the so called client id, which you'll find on UIComponent.
The following is a quick example of how to use this.
Consider the following 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 "";
}
}
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>
This will add a Faces message with content "Test msg" for the outputText component used in the example.