JSF Tutorial - JSF Validate Double Value Range Example

f:validateDoubleRange tag is used to validate a value to a range of float values.

The following code shows how to use f:validateDoubleRange tag

<f:validateDoubleRange minimum="1000.50" maximum="10000.50" />

Tag Attributes

Attribute	Description
minimum	minimum double value within an optional range
maximum	maximum double value within an optional range

Example

The following code is from result.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"
      xmlns:c="http://java.sun.com/jsp/jstl/core"
      >
    <h:body>
    Salary :  <h:outputText value="#{user.salary}" />
    </h:body>
</html>

The following code is from UserBean.java.

package com.java2s.common;

import java.io.Serializable;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
 
@ManagedBean(name="user")
@SessionScoped
public class UserBean implements Serializable{
  
  double salary;

  public double getSalary() {
    return salary;
  }

  public void setSalary(double salary) {
    this.salary = salary;
  }
  
}

The following code is from demo.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:body>
    <h:form>
      <h:panelGrid columns="3">
        Enter a double value: 
        <h:inputText id="salary" value="#{user.salary}" 
          size="10" required="true"
          label="Salary" >
          <f:validateDoubleRange minimum="10.11" maximum="10000.99" />
        </h:inputText>
        <h:message for="salary" style="color:red" />
      </h:panelGrid>
      <h:commandButton value="Submit" action="result" />
    </h:form>
    </h:body>
</html>

Download Validate_Double_Value_Range.zip

To RUN

Copy the generated WAR file from the target folder to Tomcat deployment folder and run Tomcat-Install-folder/bin/startup.bat.

After Tomcat finish starting, type the following URL in the browser address bar.

http://localhost:8080/simple-webapp/demo.xhtml