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Tapestry 5: Building Web Applications

By : Alexander Kolesnikov

4.2 (12)

Tapestry 5: Building Web Applications

4.2 (12)

By: Alexander Kolesnikov

Overview of this book

This book is for those who want to build sophisticated Java web applications quickly and easily. It assumes that the reader is reasonably comfortable with the Java programming language, but no knowledge of web technologies is needed. For experienced Servlet, JSP, or Struts developers, the book will show an alternative way that will allow them to raise their productivity to an incomparable level. With this book you will see that a contemporary component-based framework can be easy to learn and a pleasure to work with.

Tapestry 5

Tapestry 5

Credits

Credits

About the Author

About the Author

About the Reviewers

About the Reviewers

Preface

Preface

Foreword

Foreword

Free Chapter

Introduction to Tapestry

Introduction to Tapestry

Why is Tapestry Special?

Is Tapestry the Savior in the World of Java Web Development?

Summary

Creating Your Working Environment

Creating Your Working Environment

Install a JDK

Install Maven

Install NetBeans

Installing Eclipse

Installing Tomcat

Configuring the Project in Eclipse

Summary

The Foundations of Tapestry

The Foundations of Tapestry

Tapestry Application is a Set of Interactive Pages

Page Template and Page Class

Using Expansions

Using Components

Passing a Value Between Pages

What Can be Returned From an Event Handler

Tapestry Pages are Pooled

Making a Page Field Persistent

Using Page Activation Context

Different Ways of Defining Components

Structuring the Application

Creating and Using an Application State Object

Was an ASO Already Instantiated?

Summary

Simple Components

Simple Components

Celebrity Collector Project

The Auxiliary Classes

TextField, PasswordField and PageLink

Limiting Access to a Page

Loop, Output and DirectLink

Another Use of PageLink Component

Radio and RadioGroup

Using Enumerations for Radio Component Values

Prefixes: prop and literal

The If and Checkbox Components

Submit Component

More Than One Submit Button

Select Component

Configuring an Application State Object

Summary

Advanced Components

Advanced Components

Grid Component

Tweaking the Grid

Changing the Column Titles

Using GridDataSource

BeanEditForm Component

Tweaking BeanEditForm

DateField Component

Changing the Styles of Grid and BeanEditForm

FCKEditor Component

Summary

User Input Validation

User Input Validation

Adding Validation to Components

Validators

Providing Custom Error Messages

Handling Validation-Related Form Events

Cross-Form Validation

BeanEditForm Validation

Summary

Internationalization and Localization

Internationalization and Localization

Internationalization on the Java Platform

Internationalization in Tapestry

Creating and Using Message Catalogs

Providing a German Message Catalog

Switching Locale

Internationalization of Images

Using Localized Templates

Other Examples of Internationalization

Summary

Creating Custom Components

Creating Custom Components

How to Create a Tapestry 5 Component

Creating the Border Component

Adding a Navigation Menu

Using a Parameter

Unleashing the Power of Select Component

Creating an OptionModel

Creating a SelectModel

Creating a ValueEncoder

Selecting a Celebrity

DateInput Component

Making DateInput a Field

Adding Simple Validation

Creating a Universal Locale Switcher

Creating a Custom Service

Creating a Library of Custom Components

Summary

The Basics of Java for the Web

The Basics of Java for the Web

The Standard Structure of a Java Web Application

The Basics of the Deployment Descriptor

WAR Files Basics

About Java-Enabled Servers

Creating a Real Data Source with db4o

Creating a Real Data Source with db4o

Preparing the Database

The Main Operations

The Final Strokes

Where to Go Next

Where to Go Next

Submit Component

Right now we are using a basic HTML control to submit the registration form, but it takes very little effort to convert it into a Tapestry Submit component. This is how it will look then:

<input type="submit" t:type="submit" t:id="submitButton"
value="Submit"/>

We also need to add an event handler for this button to the Registration page class:

@OnEvent(component="submitButton")
void onSubmitButton()
{
System.out.println("Submit button was pressed!");
// TODO: Some code to actually register the user
}

Run the application, enter some values into the registration form and submit it by clicking on the button. You should see an output similar to this:

Setting user name: john
Setting password: abc
Setting gender: MALE
Setting subscribe: false
Submit button was pressed!
The form was submitted!

The event handler for the submit control runs exactly before the form submission handler, and so all the values submitted by the user are available to it.

Now, to give the logic of the...

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