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 :

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.

Current Comments

3 comments so far (post your own) View All Comments Latest 10 Comments:

<core:view>
<html:form id="searchQAForm">
<TABLE border=0 width="100%">
<TR>
<TD align="right">
<html:outputText>Category : </html:outputText>
<html:selectOneMenu id="searchQABackingBean" value="#{SearchQABackingBean.categoryID} ">
<core:selectItems value="#{SearchQABackingBean.categoryList}" />
</html:selectOneMenu>
<html:outputText>Search</html:outputText>
<html:inputText id="searchText" value="#{SearchQABackingBean.searchText}"/>
<html:commandButton value="Submit" action="#{SearchQABackingBean.getSearchQuestionAnswerResult}" />
</TD>
</TR>
</TABLE>
</html:form>
</core:view>

I am able to access the properties of Bean(categoryID) but not able to call the backing bean Method (getSearchQuestionAnswerResult) above
on button click.

Posted by Subhasish Mohanty on Friday, 08.8.08 @ 14:21pm | #71775

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i have write this example as it is?
(Copy&past)
but JOptionPane des not appere i have to set Navigation rule nd manged bean but it still does not work?????
it appere that he is trying to do something but nothing happend ?

Posted by Hassan on Saturday, 12.15.07 @ 23:31pm | #42539

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Trying to display a JOptionPane (using Sun System Server 9) hangs the server (popup blocking turned off).

Posted by Joe on Friday, 08.3.07 @ 20:36pm | #22588

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