JSF - f:attribute

The h:attribute tag provides option to pass a attribute value to a component, or a parameter to a component via action listener.

JSF Tag

<h:commandButton id = "submit" 
   actionListener = "#{userData.attributeListener}" action = "result"> 
   <f:attribute name = "value" value = "Show Message" />				
   <f:attribute name = "username" value = "JSF 2.0 User" />
</h:commandButton>

Tag Attributes

S.No	Attribute & Description
1	name The name of the attribute to set
2	value The value of the attribute

S.No

Attribute & Description

name

The name of the attribute to set

value

The value of the attribute

Example Application

Let us create a test JSF application to test the above tag.

Step	Description
1	Create a project with a name helloworld under a package com.tutorialspoint.test as explained in the JSF - First Application chapter.
2	Modify home.xhtml as explained below. Keep rest of the files unchanged.
3	Create result.xhtml in the webapps directory as explained below.
4	Create UserData.java as a managed bean under package com.tutorialspoint.test as explained below.
5	Compile and run the application to make sure business logic is working as per the requirements.
6	Finally, build the application in the form of war file and deploy it in Apache Tomcat Webserver.
7	Launch your web application using appropriate URL as explained below in the last step.

UserData.java

package com.tutorialspoint.test;

import java.io.Serializable;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

@ManagedBean(name = "userData", eager = true)
@SessionScoped
public class UserData implements Serializable {
   private static final long serialVersionUID = 1L;
   public String data = "1";

   public String getData() {
      return data;
   }

   public void setData(String data) {
      this.data = data;
   }

   public void attributeListener(ActionEvent event) {
      data = (String)event.getComponent().getAttributes().get("username");	
   }
}

home.xhtml

<!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"> 
   <head> 
      <title>JSF Tutorial!</title> 
   </head> 
   
   <body> 
      <h2>f:attribute example</h2> 
      <hr /> 
      
      <h:form> 
         <h:commandButton id = "submit"  
            actionListener = "#{userData.attributeListener}" action = "result">  
            <f:attribute name = "value" value = "Show Message" /> 
            <f:attribute name = "username" value = "JSF 2.0 User" /> 
         </h:commandButton> 
      </h:form> 
   
   </body> 
</html>

result.xhtml

<?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:f = "http://java.sun.com/jsf/core"    
   xmlns:h = "http://java.sun.com/jsf/html"
   xmlns:ui = "http://java.sun.com/jsf/facelets">
   
   <head>
      <title>JSF Tutorial!</title>
   </head>
   
   <h:body>
      <h2>Result</h2>
      <hr />
      #{userData.data}
   </h:body>
</html>

Once you are ready with all the changes done, let us compile and run the application as we did in JSF - First Application chapter. If everything is fine with your application, this will produce the following result.

Press Show Message button and you'll see the following result.

jsf_basic_tags.htm