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 a plugin?


An Ext JS plugin is a class that is used to provide additional functionalities to an existing component. Plugins must implement a method named init, which is called by the component and is passed as the parameter at the initialization time, at the beginning of the component's lifecycle. The destroy method is invoked by the owning component of the plugin, at the time of the component's destruction. We don't need to instantiate a plugin class. Plugins are inserted in to a component using the plugin's configuration option for that component.

Plugins are used not only by components to which they are attached, but also by all the subclasses derived from that component. We can also use multiple plugins in a single component, but we need to be aware that using multiple plugins in a single component should not let the plugins conflict with each other.