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<f:validateLength> Tag Example

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Tag description: JSF <f:validateLength> tag registers a LengthValidator instance on the UIcomponent associated with the enclosing tag. LengthValidator is a Validator that checks the number of characters in the String representation of the value of the associated component.

Code

<f:validateLength>

Example:

Step 1: Welcome page of Example

<%--
    Name= welcomeJSF.jsp
--%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
    "http://www.w3.org/TR/html4/loose.dtd">
<%--
 This file is an entry point for JavaServer Faces application.
--%>
<f:view>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>r4r.co.in</title>
</head>
<body>
<h1><h:outputText value="Tag <f:validateLength> Example"/></h1>
<h:form id="validateLength">
<%-- Display Error Message  --%>
<h:message for="validateLength:password" style="color:red" />
<h:panelGrid columns="2" cellpadding="2" cellspacing="2">
<h:outputLabel value="Choose password" />
<h:inputSecret id="password" value="#{validateLength.password}" required="true">
<%-- Used <f:validateLength> Tag --%>
<f:validateLength minimum="10" maximum="15" />
<%-- Used <f:validateRegex> Tag --%>
<f:validateRegex pattern="(^[0-9a-zA-Z]*$)" />
</h:inputSecret>
<h:commandButton action="#{validateLength.submit()}" value="Submit" />
<h:commandButton action="#{validateLength.reset()}" value="Reset" />
</h:panelGrid>
<BR><BR>
<%-- Display Result --%>
<h:panelGrid rendered="#{validateLength.flag != false}" >
Password: <h:outputText value="#{validateLength.password}" />
</h:panelGrid>
</h:form>
</body>
</html>
</f:view>

Step 2: ManagedBean class for provide logic in program

/*
 * save as a validateLengthBean.java
 */
package r4r.JSF2;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
/* -- name of bean -- */
@ManagedBean(name = "validateLength")
@RequestScoped
public class validateLengthBean {
    private String password;
    //Create a flag with initial value false
    private boolean flag = false;
    /* -- Getter/Setter -- */
    public boolean isFlag() {
        return flag;
    }
    public void setFlag(boolean flag) {
        this.flag = flag;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    /* -- submit method  -- */
    public String submit() {
        flag = true;
        return "submit";
    }
    /* -- reset method  -- */
    public String reset() {
        password = null;
        flag = false;
        return "reset";
    }
}