Book Image

Learning Ext JS

By : Colin Ramsay, Shea Frederick, Steve 'Cutter' Blades
Book Image

Learning Ext JS

By: Colin Ramsay, Shea Frederick, Steve 'Cutter' Blades

Overview of this book

<p>As more and more of our work is done through a web browser, and more businesses build web rather than desktop applications, users want web applications that look and feel like desktop applications. Ext JS is a JavaScript library that makes it (relatively) easy to create desktop-style user interfaces in a web application, including multiple windows, toolbars, drop-down menus, dialog boxes, and much more. Both Commercial and Open Source licenses are available for Ext JS.<br /><br />Ext JS has the unique advantage of being the only client-side UI library that also works as an application development library. Learning Ext JS will help you create rich, dynamic, and AJAX-enabled web applications that look good and perform beyond the expectations of your users.<br /><br />From the building blocks of the application layout, to complex dynamic Grids and Forms, this book will guide you through the basics of using Ext JS, giving you the knowledge required to create rich user experiences beyond typical web interfaces. It will also provide you with the tools you need to use AJAX, by consuming server-side data directly into the many interfaces of the Ext JS component library.</p>
Table of Contents (16 chapters)
15
Index

Object-oriented programming with Ext JS

Ext JS is a perfect example of this shift. The Ext JS library is an extremely extensive collection of packages of classes of re-usable code: small pieces of functionality that can be taken on their own, or combined to create some truly fantastic client-side magic. An additional part of its beauty is the ability to extend the library further, creating our own custom components as extensions of those already there. This gives us the ability to create our own re-usable pieces of code. We can write our own objects, as extensions of the library. This means that we don't have to write all of our functionality on our own, as much of this work has already been done for us. We expand upon the foundation, providing our own custom functionality.

Inheritance

To gain a full understanding of what we need to do, we have to understand one of the key concepts of object-oriented programming—inheritance.

As we write our own components, these components will...