Thodoris Bais

About Thodoris Bais

Thodoris Bais is currently working as a Junior Java Developer while on parallel, pursuing a diploma at Informatics & Telecommunications Engineering. He specializes in Java Core, Android and J2EE and looks forward to being a successfull professional. He is interested in entrepreneurship and is also a quick learner and curious about new technologies.

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:

                        
 
 
 
 
 
 

<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

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>

3. Demo

img

img2

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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