Book Image

Ext JS 4 Plugin and Extension Development

By : Abdullah Al Mohammad
Book Image

Ext JS 4 Plugin and Extension Development

By: Abdullah Al Mohammad

Overview of this book

Ext JS is a pure JavaScript application framework for building interactive web applications using techniques such as Ajax, DHTML, and DOM scripting. Ext JS 4 Plugin and Extension Development is a practical, step-by-step tutorial which guides you to learn and develop ExtJS plugins and extensions. There are a lot of examples with explanations and plenty of code provided to make it easier and quicker to pick up. Starting with the fundamentals, this book introduces some of the ExtJS library and community provided plugins and extensions and finishes with several hands-on, real world development examples. You will get a clear concept of ExtJS plugins and extensions and learn how to use them. You will also learn how to develop an ExtJS plugin and extension by going through several examples with code and screenshots. Ext JS 4 Plugin and Extension Development book will provide you with the knowledge to develop ExtJS plugins and extensions using real-life examples.
Table of Contents (16 chapters)
Ext JS 4 Plugin and Extension Development
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

What is an extension?


An Ext JS extension is a derived class or a subclass of an existing Ext JS class, which is designed to allow the inclusion of additional features. An Ext JS extension is mostly used to add custom functionalities or modify the behavior of an existing Ext JS class. An Ext JS extension can be as basic as the preconfigured Ext JS classes, which basically supply a set of default values to an existing class configuration. This type of extension is really helpful in situations where the required functionality is repeated at several places. Let us assume we have an application where several Ext JS windows have the same help button at the bottom bar. So we can create an extension of the Ext JS window, where we can add this help button and can use this extension window without providing the repeated code for the button. The advantage is that we can easily maintain the code for the help button in one place and can get the change in all places.