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.
Table of Contents (16 chapters)
Google Web Toolkit 2 Application Development Cookbook
Credits
About the Author
About the Reviewers
Preface
Index

Adding a subreport


In the previous report, we have shown the sales number, sales date, sales desk number, ID, and name, of both the employee and the customer. Now, we want to show the sales details (product ID, name, quantity, and price) at the bottom of the reports. For this, we have to create another report showing the sales details, and we want to see the output of that report at the bottom of the sales data shown in the report prepared in the previous recipe. To show the output of a report inside another report, a subreport is used.

A subreport is an entire report which is placed in another report. If you have one item that is linked to several items in another table, such as a sales report containing sales details, then a subreport is what you need. In such a case, generally the main report (where the subreport is placed) contains the data of the master/parent table, and the subreport contains the data of the detail/child table. For example, one "Sales table" has many "Sales_Details...