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Mastering JavaServer Faces 2.2
Mastering JavaServer Faces 2.2

Mastering JavaServer Faces 2.2: Master the art of implementing user interfaces with JSF 2.2

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Mastering JavaServer Faces 2.2

Chapter 2. Communication in JSF

Communication is the core of a JSF application, and is one of the main aspects that dictate the architecture of such an application. Thinking of the big picture, you need to identify—right from the start—the main parts and how they will communicate with one another and with the end user. After selecting design patterns, drawing the UML diagrams, and sketching the architecture and the application flow, it's time to get to work and start implementing the communication pipes using forms, parameters, arguments, values, pages, beans, and so on.

Fortunately, JSF provides many solutions for ensuring a powerful and flexible communication layer between JSF components and also between JSF and XHTML pages, the JavaScript code, and other third-party components. In this chapter, we will cover the following topics:

  • Using context parameters
  • Passing request parameters with the <f:param> tag
  • Working with view parameters
  • Calling actions on GET...

Passing and getting parameters

As you will see in the next sections, JSF provides several approaches to pass/get parameters to/from Facelets, managed beans, UI components, and so on.

Using context parameters

Context parameters are defined in the web.xml file using the <context-param> tag. This tag allows two important children: <param-name>, which indicates the parameter name, and <param-value>, which indicates the parameter value. For example, a user-defined context parameter looks like the following code:

<context-param>
  <param-name>number.one.in.ATP</param-name>
  <param-value>Rafael Nadal</param-value>
</context-param>

Now, in a JSF page, you can access this parameter as shown in the following code:

<h:outputText value="#{initParam['number.one.in.ATP']}"/>
<h:outputText value="#{facesContext.externalContext.initParameterMap['number.one.in.ATP']}"/>

In a managed bean, the same context...

Managed bean communication

Until now, we have focused especially on the communication between Facelets and managed beans. In this section, we will cover another important aspect regarding JSF communication—managed beans communication. We will discuss the following topics:

  • Injecting a managed bean into another bean
  • Communication between managed beans using the application/session map
  • Accessing other managed beans programmatically

Injecting a managed bean into another bean

A managed bean can be injected into another managed bean using @ManagedProperty. For example, let's suppose that you have a managed bean in the session scope that stores a player name and surname, as shown in the following code:

@Named
@SessionScoped
public class PlayersBean implements Serializable{

  private String playerName;
  private String playerSurname;

  public PlayersBean() {
    playerName = "Rafael";
    playerSurname = "Nadal";
  }

//getters and setters
}

Now, let's suppose that...

Summary

Communication in JSF is one of the most important aspects, since the entire application's flow spins around the capability of processing and sharing data between JSF components. As you have seen, there are many ways to pass/get parameters and to access managed beans from other managed beans, but choosing the right ones for obtaining a robust, harmonious, balanced application depends on experience. This chapter covers a wide range of solutions for building communication pipes between JSF components, but, as any developer knows, there is always a case that requires a new approach!

See you in the next chapter, where we will talk about JSF scopes.

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Description

A homogenous guide integrating the features of JSF 2.x (2.0, 2.1 and 2.2), following a “learning through examples” paradigm with its main focus on the advanced concepts of JSF. If you are a web developer who uses JSF, this is the book for you. Catering to an intermediate-advanced audience, the book assumes you have fundamental knowledge of JSF. It is intended for the developer who wants to improve their skills with the combined power of JSF 2.0, 2.1, and 2.2.

What you will learn

  • Discover how to write custom JSF 2.2 themes, custom factories, handlers, renderers, and components
  • Access unlimited developing scenarios with the concept of dependency injection
  • Enhance your applications with JSF 2.2 upload component and HTML5 friendly markup
  • Master the new JSF 2.2 Window ID technique
  • Gain insights into managing the application state with stateless viewsExplore the new CDI @ViewScoped and @FlowScoped (detailed presentation)
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jun 25, 2014
Length: 578 pages
Edition : 1st
Language : English
ISBN-13 : 9781782176466
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Apache
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ISBN-13 : 9781782176466
Vendor :
Apache
Languages :
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Tools :

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Table of Contents

14 Chapters
1. Dynamic Access to JSF Application Data through Expression Language (EL 3.0) Chevron down icon Chevron up icon
2. Communication in JSF Chevron down icon Chevron up icon
3. JSF Scopes – Lifespan and Use in Managed Beans Communication Chevron down icon Chevron up icon
4. JSF Configurations Using XML Files and Annotations – Part 1 Chevron down icon Chevron up icon
5. JSF Configurations Using XML Files and Annotations – Part 2 Chevron down icon Chevron up icon
6. Working with Tabular Data Chevron down icon Chevron up icon
7. JSF and AJAX Chevron down icon Chevron up icon
8. JSF 2.2 – HTML5 and Upload Chevron down icon Chevron up icon
9. JSF State Management Chevron down icon Chevron up icon
10. JSF Custom Components Chevron down icon Chevron up icon
11. JSF 2.2 Resource Library Contracts – Themes Chevron down icon Chevron up icon
12. Facelets Templating Chevron down icon Chevron up icon
A. The JSF Life Cycle Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

Top Reviews
Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.3
(15 Ratings)
5 star 60%
4 star 26.7%
3 star 6.7%
2 star 0%
1 star 6.7%
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pavel pscheidl Jul 11, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book has something for everyone. For beginners, it explains the very basics, plus it provides understanding how JSF is connected with other vital technologies. And it even goes the extra mile to give beginners some healthy tips in the beginning. For those who are already familiar with current or previous revisions of JavaServer Faces technology, this books offers exhaustive tour of what JSF can actually do. Latest topics, like using lambdas in EL, is also covered.On the top of it, the language level of this book is very pleasant. When used as a reference guide, information can be found quite easily without getting lost in long paragraphs of useless text. Also, there are code samples to be found everywhere.
Amazon Verified review Amazon
Nubye Oct 25, 2016
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Very practical. I recommend first read JavaServer Faces: Introduction by ExampleJuneau, Josh.
Amazon Verified review Amazon
Sergiy Pylypets Dec 21, 2014
Full star icon Full star icon Full star icon Full star icon Full star icon 5
While not being a beginer's tutorial, this book provides practical receipts and best practices for using JSF technology, including the latest features, like HTML5 and file upload support, resource library contracts, etc.Chapter 1, Dynamic Access to JSF Application Data through Expression Language (EL 3.0), contains detailed description of recent version of Expression Language (3.0), which is used in JSF 2.2, including advanced topics like creation of custom EL resolvers.Chapter 3, JSF Scopes – Lifespan and Use in Managed Beans Communication, describes all JSF scopes, including the flow scope, which allows us to demarcate a set of logically related pages or views with an entry point and an exit point.Chapter 6, Working with Tabular Data, is devoted to the creation of data tables, which are a common feature of enterprise applications.In chapter 9, JSF State Management, some security aspects of the usage of JSF technology are discussed.Chapter 10, JSF Custom Components, provides detailed instructions for creating custom JSF components, that gives us a powerful tool for extending JSF functionality and addressing sofisticated requirements and specifications.The book language is precise, clear, and easy-to-understand. The book text contains useful tip and warning sections; new and important words are highlighted.Discussed topics are illustrated by numerous code examples and neat tables and diagrams.Each chapter has a reference to the corresponding source code folder containing ready-to-run Maven projects, relevant to the topics discussed in the chapter.This book can be useful for any Java developer or software engineer, who works with JSF technology.
Amazon Verified review Amazon
Iv� Apr 06, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is the best book of JSF!!
Amazon Verified review Amazon
donald c conway Oct 31, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Excellent book on using JSF
Amazon Verified review Amazon
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