<f:validateDoubleRange>Tag Example
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Tag description: JSF <f:validateDoubleRange> Tag is register a DoubleRangeValidator instance on the UIComponent associate with the enclosing parent tag. DoubleRangeValidator is a Validator that checks the value of the corresponding component against specified minimum and maximum values.
Code
<f:validateDoubleRange>
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:validateDoubleRange> Example"/></h1>
<h:form id="ValidateDoubleRange">
<%-- Error Message display --%>
<h:message for="ValidateDoubleRange:balance" style="color:red" />
<h:panelGrid columns="2" cellpadding="2" cellspacing="2" >
<h:outputLabel value="Enter your Balance:" />
<h:inputText id="balance" value="#{validateDoubleRange.balance}" required="true">
<%-- Use <f:validateDoubleRange> Tag --%>
<f:validateDoubleRange minimum="0000.00" maximum="9999.99" />
</h:inputText>
<h:commandButton value="Submit Balance" action="#{validateDoubleRange.submit()}" />
<h:commandButton value="Reset" action="#{validateDoubleRange.reset()}" />
</h:panelGrid>
<%-- Display Result --%>
<!-- Render is used for indicate the flag position -->
<h:panelGrid rendered="#{validateDoubleRange.flag!= false}" >
Balance in Account: <h:outputText value="#{validateDoubleRange.balance}" />
</h:panelGrid>
</h:form>
</body>
</html>
</f:view>
Step 2: ManagedBean class for provide logic in program.
/*
* Save as a validateDoubleRangeBean.java
*/
package r4r.JSF2;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.RequestScoped;
@ManagedBean(name = "validateDoubleRange")
@RequestScoped
public class validateDoubleRangeBean {
private double balance;
//Create a flag with initial value false
private boolean flag = false;
/* -- Getter/Setter -- */
public double getBalance() {
return balance;
}
public void setBalance(double balance) {
this.balance = balance;
}
public boolean isFlag() {
return flag;
}
public void setFlag(boolean flag) {
this.flag = flag;
}
/* -- Submit method -- */
public String submit() {
flag = true;
return "submit";
}
/* -- Reset method -- */
public String reset() {
flag = false;
balance = 00.00;
return "reset";
}
}
output:
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