f:convertNumber Tag in JSF

What is the use?

This tag is used to register the NumberConverter instance on the enclosing component.

also read:

This class is responsible to convert String to java.util.Number object and vice-versa.

JSP file

<%@page pageEncoding="UTF-8"%>
<%@taglib prefix="f" uri="http://java.sun.com/jsf/core"%>
<%@taglib prefix="h" uri="http://java.sun.com/jsf/html"%>
<html>
    <body>
        <f:view>
            <h:form>
                <h:message for="number" />
                <h:inputText id="number" value="#{JavaBeatJsfBean.number}">
                    <f:convertNumber currencySymbol="$" type="currency" groupingUsed="#{false}"/>
                </h:inputText>
                <h:commandButton value="Submit" type="submit" action="#{JavaBeatJsfBean.submit}"/>
            </h:form>
        </f:view>
    </body>
</html>

JSF Bean

package javabeat.jsf;

/**
 * source : www.javabeat.net
 */
public class JavaBeatJsfBean {
    private String number;

    public String getNumber() {
        return number;
    }

    public void setNumber(String number) {
        this.number = number;
    }
    public String submit()
    {
        System.out.println(this.number);
        return "";
    }
}

faces-config.xml

<?xml version='1.0' encoding='UTF-8'?>

<faces-config version="1.2"
    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-facesconfig_1_2.xsd">

    <managed-bean>
    <managed-bean-name>JavaBeatJsfBean</managed-bean-name>
    <managed-bean-class>javabeat.jsf.JavaBeatJsfBean</managed-bean-class>
    <managed-bean-scope>request</managed-bean-scope>
</managed-bean>


</faces-config>

Description

  • currencyCode : In this attribute ISO 4217 currency code is set that will be applied when converting currency values.
  • currencySymbol : This sets the currency symbol that will be applied when formatting currency values.
  • groupingUsed : This is the boolean attribute and is used to specify whether the output will contain grouping seperators. Its default value is “true”.
  • integerOnly : This is the boolean attribute and is used to specify whether only the integer part will be parsed.Its default value is “false”.
  • locale : This is used to specify the name of the locale for which we have to format the number.
  • maxFractionDigits : It is used to specify the maximum no. of digits in the fractional part that will be formated.
  • maxIntegerDigits : It is used to specify the maximum no. of digits in the integer part that will be formated.
  • minFractionDigits : It is used to specify the minimum no. of digits in the fractional part that will be formated.
  • minIntegerDigits : It is used to specify the minimum no. of digits in the integer part that will be formated.
  • pattern : This is used to set the formatting pattern.
  • type : It is used to specify the type of formatting. Its valid values are “number” “currency” “percentage”. Its default value is “number”.

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About Krishna Srinivasan

He is Founder and Chief Editor of JavaBeat. He has more than 8+ years of experience on developing Web applications. He writes about Spring, DOJO, JSF, Hibernate and many other emerging technologies in this blog.

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