Jsf validateLength example

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JSF f validateLength tag:

JSF f:validateLength tag is used to validate the length of a string.

Syntax:

<f:validateLength minimum="m" maximum="n" />

JSF f validateLength tag attribute:

Attribute Description
1. minimum It specify minimum number of characters
2. maximum It specify maximum number of characters

Example:

test.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:head>
		<title>JSF f validate length example.</title>
	</h:head>
    <h:body>
    	<h2>JSF f validate length example.</h2>
 
    	<h:form>
    	   <h:inputText id="userId" 
    	   label="UserName: " value="#{test.userName}">
    	     <f:validateLength minimum="5" maximum="10" />
    	   </h:inputText>
    	   <br/>
    	   <h:message for="userId" style="color:red" />
    	   <br/>
    	   <h:commandButton 
    	         value="Say Hello" action="success"/>    	   	
    	</h:form>
 
    </h:body>
 
</html>

Test.java

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
 
/**
 * Managed bean.
 * @author w3schools
 */
@ManagedBean(name="test")
@SessionScoped
public class Test {
	private String userName;
 
	public String getUserName() {
		return userName;
	}
 
	public void setUserName(String userName) {
		this.userName = userName;
	}		
}

welcome.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:head>
		<title>JSF f validate length example.</title>
	</h:head>
    <h:body>
    	<h2>JSF f validate length example.</h2> 
    	<h3>Hello <h:outputText value="#{test.userName}"/></h3> 	
    </h:body>
 
</html>

faces-config.xml

<?xml version="1.0" encoding="windows-1252"?>
<faces-config version="2.0" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xmlns:xi="http://www.w3.org/2001/XInclude" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-facesconfig_2_0.xsd">
 
<navigation-rule>
   <from-view-id>test.xhtml</from-view-id>
   <navigation-case>
      <from-outcome>success</from-outcome>
      <to-view-id>welcome.xhtml</to-view-id>
   </navigation-case>   
</navigation-rule>
 
</faces-config>

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
    	xmlns="http://java.sun.com/xml/ns/javaee" 
    	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
 
    <servlet>
        <servlet-name>faces</servlet-name>
        <servlet-class>
         javax.faces.webapp.FacesServlet
	<servlet-mapping>
        <servlet-name>faces</servlet-name>
        <url-pattern>/faces/*</url-pattern>
    </servlet-mapping>
 
</web-app>

URL:

http://localhost:7001/JSFExample32/faces/test.xhtml

Output:

JSF example32-1
 
Enter string of less than 5 characters.
JSF example32-2
 
Click Say Hello button.
JSF example32-3
 
Download this example.