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Introduction
is book is a succinct guide to the Ext JS 4 framework written from a developer’s perspective. My objective is that,
after reading this book, you should be able to develop an Ext JS 4 application right away.
Who Should Read This Book?
is book is written for programmers who want to build rich Internet applications using the Ext JS 4 library. If you are
working on a project using Ext JS 4, or are ready to get started with a new Ext JS 4 application, this book is for you, as it
explains all the concepts in Ext JS 4 from a developer’s point of view. Or if you are just interested in reading about
Ext JS 4 and its features, this book should make it clear.
I have assumed a basic knowledge of HTML and JavaScript on the part of the reader. If you have been an
OO programmer but have never been in the mainstream of JavaScript development, and now want to write rich web
applications, then Ext JS 4 and this book are for you. However, this book should not be used as a primer on general
web application development and JavaScript; it is more specialized than that.
How to Read This Book?
It’s strongly recommended that you read the book in chapter order from the rst to the last. Each chapter talks about
a particular topic and will have examples built using the concepts covered in previous chapters. Hence skipping
chapters may lead to confusion as you may well run into terms that were explained in the chapters you missed.
is book is not a comprehensive substitute for the Ext JS 4 API documentation. Ext JS 4 provides tons of classes
and functions, and I don’t have time and space to explain all of them. So you still need to refer to the documentation.
e concepts are explained in a pretty straightforward and succinct manner.
Contents overview
Chapter 1• , Core JavaScript and JavaScript Frameworks introduces you to the core language
features of JavaScript such as function hoisting, the arguments keyword, JSON, etc., that will
help you understand Ext JS 4 API better. It also introduces you to JavaScript frameworks in
general and their signicance in web development.
Chapter 2• , Overview of Ext JS 4 gets you started with Ext JS 4 by setting up the environment
and writing some basic code.
Chapter 3• , Understanding Ext JS 4 API explains the structure of the Ext JS 4 API. I show you
how to use Ext JS 4 syntax to create custom classes and objects, and introduce features like
inheritance, overriding, and mixins.
Chapter 4• , Controls and Layout covers the basic UI controls such as textbox, button,
checkbox, etc. It also deals with basic form validations and form processing concepts. e
chapter explains the layout controls and gives a detailed description of using layout controls
like Border layout, Card layout, etc.
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