Radio Buttons Example with JSF 2.0

Thodoris BaisFebruary 4th, 2014Last Updated: May 9th, 2019

0 352 2 minutes read

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:

<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:

By hardcoding the values into f:selectItem tag.
By generating values (using a Java Map) and putting them into f:selectItem tag.
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

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

 <?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: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:

response.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">

    <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>