JavaServer Faces (JSF 2) provides a number of user interfaces components that cover the most common requirements, one of the most important component is a selectManyListBox component. The selectManyListBox is a component that been used for making multiple selection. The using of selectManyListBox component can be achieved by means of using an inline selection values, a list of options defined in the managed bean or by using a pre-defined objects.
Also Read:
1. Managed Bean
SelectManyListBoxBean.java
package net.javabeat.jsf;
import java.util.ArrayList;
import java.util.List;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
@ManagedBean
@SessionScoped
public class SelectManyListBoxBean {
public List tutorials;
public List selectedTutorials;
public SelectManyListBoxBean(){
this.tutorials = new ArrayList();
this.tutorials.add(new Tutorial(1, "JSF 2"));
this.tutorials.add(new Tutorial(2, "JPA"));
this.tutorials.add(new Tutorial(3, "Maven"));
this.tutorials.add(new Tutorial(4, "Eclipse"));
this.tutorials.add(new Tutorial(5, "Java"));
this.tutorials.add(new Tutorial(6, "Java EE"));
}
public List getTutorials() {
return tutorials;
}
public void setTutorials(List tutorials) {
this.tutorials = tutorials;
}
public List getSelectedTutorials() {
return selectedTutorials;
}
public void setSelectedTutorials(List selectedTutorials) {
this.selectedTutorials = selectedTutorials;
}
public String submitTraining(){
return "selectedTraining";
}
}
2. Tutorial Type
The provided example depends on the Tutorial type (class) for making an options. This is a third type of making a selections instead of using inline options and SelectItem as you’ve seen at the SelectOneMenu example. This use is also applicable for selectManyListBox.
Tutorial.java
package net.javabeat.jsf;
public class Tutorial {
private int tutorialId;
private String tutorialDescription;
public Tutorial(int id, String desc){
this.tutorialId = id;
this.tutorialDescription = desc;
}
public int getTutorialId() {
return tutorialId;
}
public void setTutorialId(int tutorialId) {
this.tutorialId = tutorialId;
}
public String getTutorialDescription() {
return tutorialDescription;
}
public void setTutorialDescription(String tutorialDescription) {
this.tutorialDescription = tutorialDescription;
}
}
3. The Views
Next coming scenario shows you a sample view that displays the Training Tutorial, once the trainee has submitted these selections by using Submit Training action, the JSF implementation navigation handler will direct the trainee into another view to show it the submitted values.
selectManyListBox.xhtml
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<h:form>
<h1><h:outputText value="JavaBeat JSF 2.2 Examples" /></h1>
<h2><h:outputText value="SelectManyListBox Example" /></h2>
<h:selectManyListbox value="#{selectManyListBoxBean.selectedTutorials}" size="4">
<f:selectItems value="#{selectManyListBoxBean.tutorials}" var="tutorial"
itemValue="#{tutorial.tutorialId}" itemLabel="#{tutorial.tutorialDescription}">
</f:selectItems>
</h:selectManyListbox>
<h:commandButton value="Submit Training" action="#{selectManyListBoxBean.submitTraining}"></h:commandButton>
</h:form>
</html>
selectedTraining.xhtml
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core">
<f:view>
<h1><h:outputText value="JavaBeat JSF 2.2 Examples" /></h1>
<h2><h:outputText value="SelectManyListBox Example" /></h2>
<h:form>
<h:outputText value="Selected Tutorials: "/>
<br/>
<ui:repeat var="tutorial" value="#{selectManyListBoxBean.selectedTutorials}">
<h:outputText value="#{tutorial}"/>
<br/>
</ui:repeat>
</h:form>
</f:view>
</html>
4. The Deployment Descriptor (web.xml)
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5" metadata-complete="true"> <context-param> <description>State saving method: 'client' or 'server' (=default). See JSF Specification 2.5.2</description> <param-name>javax.faces.STATE_SAVING_METHOD</param-name> <param-value>client</param-value> </context-param> <context-param> <param-name>javax.faces.application.CONFIG_FILES</param-name> <param-value>/WEB-INF/faces-config.xml</param-value> </context-param> <servlet> <servlet-name>Faces Servlet</servlet-name> <servlet-class>javax.faces.webapp.FacesServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>Faces Servlet</servlet-name> <url-pattern>/faces/*</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>Faces Servlet</servlet-name> <url-pattern>*.xhtml</url-pattern> </servlet-mapping> <listener> <listener-class>com.sun.faces.config.ConfigureListener</listener-class> </listener> </web-app>
5. JSF 2 SelectManyListBox Demo
The below snapshots that you would be seeing provide you a running sample of using SelectManyListBox.
[wpdm_file id=4]
JSF 2 SelectOneListBox Example