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/

jsf2-hidden-value--example-1

Download Source Code

Download It – JSF-2-HiddenValue-Example.zip (9KB)
Note
You may interest to know how to pass new hidden value to backing bean in JSF.

Reference

  1. JSF <h:inputHidden /> JavaDoc
Tags :
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