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/