Google Web Toolkit 2 Application Development Cookbook

Book Image

Google Web Toolkit 2 Application Development Cookbook

By : Shamsuddin Ahammad

Book Image

Google Web Toolkit 2 Application Development Cookbook

By: Shamsuddin Ahammad

Overview of this book

GWT 2 radically improves web experience for users by using existing Java tools to build no-compromise AJAX for any modern browser. It provides a solid platform so that other great libraries can be built on top of GWT. Creating web applications efficiently and making them impressive, however, is not as easy as it sounds. Writing web applications for multiple browsers can be quite tasking. In addition, building, reusing, and maintaining large JavaScript code bases and AJAX components can be difficult. GWT 2 Application Development Cookbook eases these burdens by allowing developers to quickly build and maintain complex yet highly efficient JavaScript front-end applications in the Java programming language . It tells you how to make web experience all the more thrilling and hassle free, using various tools along with GWT SDK.This book starts with developing an application from scratch. Right from creating the layout of the home page to home page elements including left and right sidebars, to placing tree like navigational menu, menu bars, tool bars, banners, footers are discussed with examples. You will see how to create forms using the Ext GWT library widgets and handle different types of events. Then you will move on to see how to design a database for sales processing systems and learn to create the database in MySQL with the help of easy–to-follow recipes. One of the interesting topics of this book is using JPA in GWT. Using the JPA object in GWT is a challenge. To use them perfectly, a mechanism to convert the JPA object into plain object and vice versa is required. You will see recipes to use entity classes, entity managers, and controller classes in GWT application. You will efficiently create reports with parameters, variables and subreports, and get the report output in both HTML and PDF format using real-world recipes. You will then learn to configure the GlassFish server to deploy a GWT application with database. Finally, learn how to trace speed and improve perfomance in web applications using tracing techniques.

Google Web Toolkit 2 Application Development Cookbook

Google Web Toolkit 2 Application Development Cookbook

Credits

About the Author

About the Author

About the Reviewers

About the Reviewers

Preface

Free Chapter

Setting up the GWT Environment in NetBeans

Setting up the GWT Environment in NetBeans

Installing GWT SDK

Installing GlassFish

Installing MySQL server

Configuring the MySQL Server

Installing NetBeans IDE

Adding the GlassFish server in NetBeans

Installing the GWT4NB plugin in NetBeans

Creating a GWT project in NetBeans

Creating Home Page with Panels and Menus

Creating Home Page with Panels and Menus

Creating the home page layout class

Adding the banner

Creating the left-hand sidebar

Creating the right-hand sidebar

Creating the main content panel

Creating the footer

Using the HomePage instance in EntryPoint

Forms with Layout and Widgets

Forms with Layout and Widgets

Using TextField

Using a simple combo box

Using the radio button

Using DateField

Creating a simple form

Creating a form with two columns

Creating a TabPanel to show forms as tabs

Creating a navigation sidebar with Accordion layout

Handling your First Events

Handling your First Events

Handling ButtonEvent

Using the SelectionChange event

Handling FieldEvent

Working with the KeyUp event

Handling ChangeEvent

Working with MenuEvent

Using FocusEvent

Handling the DatePicker event

Creating Database for Sales Processing

Creating Database for Sales Processing

Creating the database

Creating tables with primary key

Defining foreign keys

Backing up database

Restoring database

Managing Entities using JPA

Managing Entities using JPA

Creating a database connection in NetBeans

Creating a persistence unit

Creating entity classes from the database

Creating controller classes

Communicating with the Server using GWT RPC

Communicating with the Server using GWT RPC

Creating DTO classes

Mapping entity classes and DTOs

Creating the GWT RPC Service

Defining an RPC method to persist objects

Calling the RPC method from Client UI

Finding an entity

Updating an entity

Deleting an entity

Managing a list for RPC

Authenticating a user through username and password

Reporting with iReport

Reporting with iReport

Installing iReport plugins in NetBeans

Creating a report

Adding a parameter in a report

Adding a subreport

Adding a variable

Showing a report in the GWT application as HTML

Creating HTML report viewer

Calling HtmlReportViewer

Showing a report in a GWT application as PDF

Creating a PDF report viewer

Calling PdfReportViewer

Deploying a GWT Application

Deploying a GWT Application

Building a project and creating the WAR file

Deploying on the GlassFish Server from NetBeans

Creating the JDBC Connection Pool in GlassFish

Creating a JDBC Resource in GlassFish Server

Deploying the WAR file in the GlassFish Server

Using Speed Tracer

Using Speed Tracer

Installing Speed Tracer

Running Speed Tracer

Analyzing event details

Analyzing network

Understanding hints

Index

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Handling the DatePicker event

In this recipe, we are going to calculate the age of a person when the date of birth is given in DateField.

Getting ready

For this example, it is assumed that:

dateOfBirtField is an instance of the com.extjs.gxt.ui.client.widget.form.DateField class
ageField is an instance of the com.extjs.gxt.ui.client.widget.form.TextField class

How to do it...

The code for this recipe is as follows:

dateOfBirthField.getDatePicker().addListener (Events.Select,new Listener<DatePickerEvent>()
{
@Override
public void handleEvent(DatePickerEvent be)
{
Date today=new Date();
Date dob=dateOfBirthField.getValue();
long difference=today.getTime()-dob.getTime();
long second=difference/1000;
long minute=second/60;
long hour=minute/60;
long day=hour/24;
long month=day/30;
day=day%30;
long year=month/12;
month=month%12;
ageField.setValue(year+" year "+month+" month "+day+" day");
}
}) ;

How it works...

Let's explain how these steps allow us to complete the task or solve the problem.

DatePicker...