JSF 2 Dynamic Target View ID (to-view-id) Example

The to-view-id element can be a value expression, in which case it is evaluated. The result is used as the view ID. This type of providing of to-view-id isn’t implemented before JSF 2.0. This

Also Read:

JSF 2 Tutorials

JSF Tutorials

Introduction to JSF

1. Managed Bean

IndexBean.java

package net.javabeat.jsf;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

@ManagedBean
@SessionScoped
public class IndexBean {
	private String username;
	private String password;
	private String nextView;

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public String getNextView() {
		return nextView;
	}
	public void setNextView(String nextView) {
		this.nextView = nextView;
	}

	public String login(){
		if(this.username.equalsIgnoreCase("javabeat") &&
				this.password.equals("javabeat")){
			return "welcome";
		}
		else {
			FacesContext.getCurrentInstance().addMessage(null,
                             new FacesMessage("You're username or password isn't valid"));
			return "login";
		}

	}

	public String logout(){
		this.nextView = "login";
		return "logout";
	}

	public String expensesView(){
		this.nextView = "expensesView";
		return "expenses";
	}
}

2. The views

login.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:head>
	<h:outputScript library="javax.faces" name="jsf.js"/>
</h:head>
<h:body>
	<f:view>
		<h1>JavaBeat JSF 2.2 Examples</h1>
		<h2>JSF2 Dynamic Navigation - Redirect Example</h2>
		<h:form prependId="false">
			<h:messages globalOnly="true" style="color:red"></h:messages>
			<h:panelGrid columns="2">
				<h:outputText value="Enter Username: "/>
				<h:inputText value="#{indexBean.username}"/>
				<h:outputText value="Enter Password: "/>
				<h:inputText value="#{indexBean.password}"/>
			</h:panelGrid>
			<h:commandButton value="Login" action="#{indexBean.login}"></h:commandButton>
		</h:form>
	</f:view>
</h:body>
</html>

welcome.xhtml

<!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: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>
		<h:form>
			<h1>JavaBeat JSF 2.2 Examples</h1>
			<h2>JSF2 Dynamic Navigation - Redirect Example</h2>
			<h:outputText value="Welcome Mr.#{indexBean.username}"/>
			<br/>
			<h:commandLink value="Logout" action="#{indexBean.logout}"/>
			#{' '}
			<h:commandLink value="Expenses" action="#{indexBean.expensesView}"/>
		</h:form>
	</f:view>
</html>

expensesView.xhtml

<!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: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>
		<h:form>
			<h1>JavaBeat JSF 2.2 Examples</h1>
			<h2>JSF2 Dynamic Navigation - Redirect Example</h2>
			<h:panelGrid columns="2">
				<h:outputText value="Oil"/>
				<h:outputText value="20 USD"/>
				<h:outputText value="House"/>
				<h:outputText value="50 USD"/>
				<h:outputText value="Schools"/>
				<h:outputText value="200 USD"/>
			</h:panelGrid>
			<br/>
			<h:commandButton value="logout" action="login?faces-redirect=true"/>
		</h:form>
	</f:view>
</html>

3. Faces Configuration File

faces-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<faces-config xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
				http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
	version="2.2">
<application>
	<resource-bundle>
		<base-name>net.javabeat.jsf.application</base-name>
		<var>msg</var>
	</resource-bundle>
</application>
<navigation-rule>
	<from-view-id>/welcome.xhtml</from-view-id>
	<navigation-case>
		<to-view-id>#{indexBean.nextView}</to-view-id>
		<redirect/>
	</navigation-case>
</navigation-rule>
</faces-config>

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 Dynamic Target View Demo

The below snapshots will show you the impact of using dynamic target view in the navigation.

If you’ve noted that the faces-config.xml doesn’t provide neither navigation rule and nor string outcome for navigating from welcome.xhtml into expensesView or into login view via expenses and logout actions respectively.
The navigation has been done through by means of providing a dynamic target view expression #{indexBean.nextView}

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1. Managed Bean

2. The views

3. Faces Configuration File

4. The Deployment Descriptor (web.xml)

5. JSF 2 Dynamic Target View Demo

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