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JSF actionListener Tag

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This tag is used to add a action listener to the component associated with the enclosing tag. When user does an event on the component then this action takes place.

JSF actionListener Tag

        

This tag is used to add a action listener to the component associated with the enclosing tag. When user does an event on the component then this  action takes place. The class where this action is defined implements ActionListener interface. In this example this class is "MyBean.java" in roseindia package. Within this class a method processAction() is written, where we write our logic of action.

Code Description :

<%@ page contentType="text/html" %>
<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>

<f:view>
<html>
<body>
<h:form id="form1">
<h:commandButton id="button1" value="Click">
<f:actionListener type="roseindia.MyBean" />
</h:commandButton>
</h:form>
</body>
</html>
</f:view>

MyBean.java :

package roseindia;

import java.util.*;
import javax.swing.*;
import javax.faces.event.*;

public class MyBean implements ActionListener,ValueChangeListener{
String som = "";
private Date today = new Date();
public void processAction(ActionEvent e){
JOptionPane.showMessageDialog(null,"Hi");
}


public void processValueChange(ValueChangeEvent ce){
JOptionPane.showMessageDialog(null, ce.getSource());
}

public String getSom(){
return som;
}

public void setSom(String som){
this.som = som;
}

public Date getToday(){
return today;
}

public void setToday(Date today) {
this.today = today;
}
}

Rendered Output : This is the first page that appears to the user. There is one form button which when clicked renders a message dialog as it is shown in the second picture below.

 

Html Source Code :

<html>
<body>
<form id="form1" method="post" action="/f-tags/pages/actionListener/actionListener.jsf" enctype="application/x-www-form-urlencoded">
<input id="form1:button1" type="submit" name="form1:button1" value="Click" />
<input type="hidden" name="form1" value="form1" /></form>
</body>
</html>

This tag contains one attribute :

type : This attribute is used to specify the fully qualified  name of the class which has implemented ActionListener interface and implemented processAction() method.

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Posted on: June 13, 2007

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