JSF ActionListener
In JSF when user interacts with GUI components like h:commandButton or h:link, the JSF triggers an action events
these events can be implemented in two ways.
1. Method binding- Create a method in managed bean and call this via actionListener attributes
2. Using ActionListener interface- Create a separate class which implements ActionListener and implement processAction method.
Example
1.Create a managed bean
2. Create an Action listener class which implements ActionListener
3. Create xhtml file to create ui components
4. Run it..
5. Done !!..download example (vinod-jsf)
https://github.com/kkvinodkumaran/myrepository
In JSF when user interacts with GUI components like h:commandButton or h:link, the JSF triggers an action events
these events can be implemented in two ways.
1. Method binding- Create a method in managed bean and call this via actionListener attributes
2. Using ActionListener interface- Create a separate class which implements ActionListener and implement processAction method.
Example
1.Create a managed bean
package com.vinod.jsf;
import javax.faces.bean.ManagedBean;
import javax.faces.event.ActionEvent;
@ManagedBean(name = "actionListenerBean", eager = true)
public class ActionListenerBean {
public ActionListenerBean() {
System.out.println("My ActionListenerBean");
}
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String submit() {
System.out.println("submit clicked");
return "success.jsp";
}
public void actionSubmit(ActionEvent e) {
System.out.println("Action submit triggered");
System.out.println("Action submit event =" + e.getComponent().getId());
setName(e.getComponent().getId());
}
}
import javax.faces.bean.ManagedBean;
import javax.faces.event.ActionEvent;
@ManagedBean(name = "actionListenerBean", eager = true)
public class ActionListenerBean {
public ActionListenerBean() {
System.out.println("My ActionListenerBean");
}
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String submit() {
System.out.println("submit clicked");
return "success.jsp";
}
public void actionSubmit(ActionEvent e) {
System.out.println("Action submit triggered");
System.out.println("Action submit event =" + e.getComponent().getId());
setName(e.getComponent().getId());
}
}
2. Create an Action listener class which implements ActionListener
package com.vinod.jsf;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ActionEvent;
import javax.faces.event.ActionListener;
public class MyActionListener implements ActionListener {
@Override
public void processAction(ActionEvent event) throws AbortProcessingException {
System.out.println("Executing process action event "+event.getComponent().getId());
}
}
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ActionEvent;
import javax.faces.event.ActionListener;
public class MyActionListener implements ActionListener {
@Override
public void processAction(ActionEvent event) throws AbortProcessingException {
System.out.println("Executing process action event "+event.getComponent().getId());
}
}
3. Create xhtml file to create ui components
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<head>
<title>My JSF Examples</title>
</head>
<h:body>
#{myFirstManagedBean.message}
<h:form>
<h1>
<h:outputText value="Hello ActionListener!" />
</h1>
<h:outputText id="name" value="Name :" />
<h:inputText id="nametext" value="#{actionListenerBean.name}">
</h:inputText>
<h:outputText value="ActionListener Using method binding" />
<h:commandButton value="Method binding 1" id="methodbindingButton1"
actionListener="#{actionListenerBean.actionSubmit}"
action="#{actionListenerBean.submit}" />
<br> </br>
<br> </br>
<h:outputText value="ActionListener Using ActionListener Interface" />
<h:commandButton id="ActionListenerButton"
value="Action Listener Interface"
action="#{actionListenerBean.submit}">
<f:actionListener type="com.vinod.jsf.MyActionListener" />
</h:commandButton>
</h:form>
</h:body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<head>
<title>My JSF Examples</title>
</head>
<h:body>
#{myFirstManagedBean.message}
<h:form>
<h1>
<h:outputText value="Hello ActionListener!" />
</h1>
<h:outputText id="name" value="Name :" />
<h:inputText id="nametext" value="#{actionListenerBean.name}">
</h:inputText>
<h:outputText value="ActionListener Using method binding" />
<h:commandButton value="Method binding 1" id="methodbindingButton1"
actionListener="#{actionListenerBean.actionSubmit}"
action="#{actionListenerBean.submit}" />
<br> </br>
<br> </br>
<h:outputText value="ActionListener Using ActionListener Interface" />
<h:commandButton id="ActionListenerButton"
value="Action Listener Interface"
action="#{actionListenerBean.submit}">
<f:actionListener type="com.vinod.jsf.MyActionListener" />
</h:commandButton>
</h:form>
</h:body>
</html>
4. Run it..
https://github.com/kkvinodkumaran/myrepository
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