JSF 2 hidden value example

In JSF, you can use the <h:inputHidden /> tag to render a HTML hidden value field. For example,

JSF tag…

<h:inputHidden value="some text" />

Render this HTML code…

<input type="hidden" name="random value" value="some text" />

JSF hidden field example

A JSF 2 example to render a hidden field via <h:inputHidden /> tag, and access the hidden value in JavaScript.

1. Managed Bean

A simple managed bean, declared as “user”.

package com.mkyong.form;

import javax.faces.bean.ManagedBean;

import javax.faces.bean.SessionScoped;

import java.io.Serializable;

@ManagedBean(name="user")

@SessionScoped

public class UserBean implements Serializable {

	String answer = "I'm Hidden value!";

	public String getAnswer() {

		return answer;

	}

	public void setAnswer(String answer) {

		this.answer = answer;

	}

}

2. View Page

Render a hidden value via “h:inputHidden” tag, if the button is clicked, print the hidden value via JavaScript.

<?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:head>

	  <script type="text/javascript">

	    function printHiddenValue(){

	       alert(document.getElementById('myform:hiddenId').value);	

	    }

	  </script>

	</h:head>

    <h:body>

    	<h1>JSF 2 hidden value example</h1>

	  <h:form id="myform">

    		<h:inputHidden value="#{user.answer}" id="hiddenId" />

    		<h:commandButton type="button" value="ClickMe" onclick="printHiddenValue()" />

    	  </h:form>

    </h:body>

</html>

3. Demo

URL : http://localhost:8080/JavaServerFaces/

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