JSF Tutorial - JSF Attribute Example








We can use h:attribute tag to pass a attribute value to a component, or a parameter to a component via action listener.

The following code shows how to use h:attribute 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

AttributeDescription
nameThe name of the attribute to set
valueThe value of the attribute




Example

The following code is from UserBean.java.

package com.java2s.common;

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

@ManagedBean(name="user")
@SessionScoped
public class UserBean{
  public String nickname;
  
  public void attrListener(ActionEvent event){
    nickname = (String)event.getComponent().getAttributes().get("username");
  }
  public String outcome(){
    return "result";
  }
  public String getNickname() {
    return nickname;
  }
  public void setNickname(String nickname) {
    this.nickname = nickname;
  }
  
}

The following code is from demo.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:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core">
    <h:body>
    <h:form id="form">
      <h:commandButton action="#{user.outcome}"
          actionListener="#{user.attrListener}">
        <f:attribute name="username" value="java2s.com" />
        <f:attribute name="value" value="Click Me" />
      </h:commandButton>
    </h:form>
    </h:body>
</html>

The following code is from 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:h="http://java.sun.com/jsf/html">
     
    <h:body>
    #{user.nickname}
    </h:body>
</html>


Download Attribute.zip





To RUN

Copy the generated WAR file from the target folder to Tomcat deployment folder and run Tomcat-Install-folder/bin/startup.bat.

After Tomcat finish starting, type the following URL in the browser address bar. 

http://localhost:8080/simple-webapp/demo.xhtml