jsf

Radio Buttons Example with JSF 2.0

So today, we ‘re gonna talk about radiobuttons’ integration together with JSF 2.0 and Eclipse IDE. In JSF, we can use the h:selectOneRadio tag, in order to create a radiobutton like input element.
 
 
 
 
 
 
 
 
 

 
For example, assume the following JSF code:

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<h:selectOneRadio value="#{user.favoriteBMW}">
    <f:selectItem itemValue="335" itemLabel="BMW 335" />
    <f:selectItem itemValue="316" itemLabel=" BMW 316" />
    <f:selectItem itemValue="M3 SMG" itemLabel="BMW M3 SMG" />
</h:selectOneRadio>

The afore-mentioned code is somehow translated to our familiar HTML format, with JSF to autoembedding the whole selectOneRadio‘s structure into a proper HTML table. Indeed, JSF cares about style. One more thing, before getting into code: There are 3 possible ways that let us render radiobuttons, according to h:selectOneRadio:

  1. By hardcoding the values into f:selectItem tag.
  2. By generating values (using a Java Map) and putting them into f:selectItem tag.
  3. By generating values (using an Object array) and putting the into f:selectItem tags; then, we have to represent the value with a var attribute.

1. Backing Bean

Here is our Backing Bean that holds the submitted data:

UserBean.java

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package com.javacodegeeks.enterprise.jsf.radiobuttons;
 
import java.io.Serializable;
import java.util.Map;
import java.util.LinkedHashMap;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
 
@ManagedBean
@SessionScoped
public class UserBean implements Serializable{
 
    private static final long serialVersionUID = 7134492943336358840L;
 
    String favoriteCar1, favoriteCar2, favoriteCar3;
 
    public String getFavoriteCar1() {
        return favoriteCar1;
    }
 
    public void setFavoriteCar1(String favoriteCar1) {
        this.favoriteCar1 = favoriteCar1;
    }
 
    public String getFavoriteCar2() {
        return favoriteCar2;
    }
 
    public void setFavoriteCar2(String favoriteCar2) {
        this.favoriteCar2 = favoriteCar2;
    }
 
    public String getFavoriteCar3() {
        return favoriteCar3;
    }
 
    public void setFavoriteCar3(String favoriteCar3) {
        this.favoriteCar3 = favoriteCar3;
    }
 
    //generated by Map
    private static Map<String, Object> car2Value;
    static
    {
        car2Value = new LinkedHashMap<String, Object>();
 
        car2Value.put("BMW 335", "335"); //label, value
        car2Value.put("BMW 316", "316");
        car2Value.put("BMW M3 SMG", "M3 SMG");
    }
 
    public Map<String, Object> getFavoriteCar2Value()
    {
        return car2Value;
    }
 
    //generated by Object array
    public static class Car
    {
        public String carLabel;
        public String carValue;
 
        public Car(String carLabel, String carValue)
        {
            this.carLabel = carLabel;
            this.carValue = carValue;
        }
 
        public String getCarLabel(){
            return carLabel;
        }
 
        public String getCarValue(){
            return carValue;
        }
 
    }
 
    public Car[] car3List;
    public Car[] getFavoriteCar3Value()
    {
        car3List = new Car[3];
 
        car3List[0] = new Car("BMW 335", "335");
        car3List[1] = new Car("BMW 316", "316");
        car3List[2] = new Car("BMW M3 SMG", "M3 SMG");
 
        return car3List;
    }
}

2. JSF Pages

The first page will display the three fore-mentioned JSF radiobutton techniques:

index.xhtml

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<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 RadioButtons Example</title>
    </h:head>
 
    <h:body>
        <h1>JSF 2 RadioButtons Example</h1>
 
        <h:form>
            1. Hardcoded with "f:selectItem" :
            <h:selectOneRadio value="#{user.favoriteCar1}">
                <f:selectItem itemValue="335" itemLabel="BMW 335" />
                <f:selectItem itemValue="316" itemLabel="BMW 316" />
                <f:selectItem itemValue="M3 SMG" itemLabel="BMW M3 SMG" />
            </h:selectOneRadio>
 
            <br/>
 
            2. Generated by Map:
            <h:selectOneRadio value="#{user.favoriteCar2}">
                <f:selectItems value="#{user.favoriteCar2Value}" />
            </h:selectOneRadio>
 
            <br/>
 
            3. Generated by Object Array; access with "var"
            <h:selectOneRadio value="#{user.favoriteCar3}">
                <f:selectItems value="#{user.favoriteCar3Value}" var="c"
                    itemLabel="#{c.carLabel}" itemValue="#{c.carValue}" />
            </h:selectOneRadio>
 
            <br/>
 
            <h:commandButton value="Submit" action="response"/>
            <h:commandButton value="Reset" type="reset"/>
        </h:form>
    </h:body>
</html>

And the second one, will return the submitted data:

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response.xhtml

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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<html xmlns="http://www.w3.org/1999/xhtml"   
      xmlns:h="http://java.sun.com/jsf/html">
 
    <h:body>
        <h1>JSF 2.0 RadioButton Example - Response Page</h1>
 
        <ol>
            <li>user.favoriteCar1 : #{user.favoriteCar1}</li>
            <li>user.favoriteCar2 : #{user.favoriteCar2}</li>
            <li>user.favoriteCar3 : #{user.favoriteCar3}</li>
        </ol>
 
    </h:body>
</html>

3. Demo

img

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This was an example of Radio Buttons in JSF 2.0. You can also download the source code for this example: RadioButtonsJSF.zip

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Thodoris Bais

Thodoris is an Oracle Certified Associate Java Programmer and currently works as a Junior Software Developer, for Intrasoft International S.A. He holds a diploma at Informatics & Telecommunications Engineering and is interested in continuous development.
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