RichFaces <a4j:commandLink>

It is similar to the JavaServer Faces ( JSF) <h:commandLink> component except that it includes plugged-in Ajax behavior.

The <a4j:commandLink> requires only the value attribute to be used. We should use this attribute to set text for the link.

Note - The <a4j:commandLink> uses the click event instead of the submit event.

Example

Here, in the following example, we are implementing <a4j:commandLink>component. This example contains the following files.

JSF File

// commandLink.xhtml

<ui:composition 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"
xmlns:a4j="http://richfaces.org/a4j"
xmlns:rich="http://richfaces.org/rich">
<h:head></h:head>
<h:form id="form">
<h:outputText value="Name: " />
<h:inputText value="#{user.name}" />
<a4j:commandLink value="Click here" render="out" execute="@form" />
</h:form>
<br />
<a4j:outputPanel id="out">
<h:outputText value="Hello #{user.name} !" rendered="#{not empty user.name}" />
</a4j:outputPanel>
</ui:composition>

Managed Bean

// User.java

import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
@ManagedBean
@RequestScoped
public class User {
String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

Output: