Chapter 10. Patterns in Ext JS

In this chapter, you will learn the following recipes:

• Sharing functionality with the Action class

• Autosaving form values

• Saving resources with lazy component instantiation

• Extending a class

• Using code modules to achieve encapsulation

• Implementing a publish/subscribe mechanism with relayEvents()

• Augmenting a class with a plugin

• Building preconfigured classes

• Implementing state preservation with cookies

Introduction

In this chapter, you will explore some additional design patterns used to build robust and flexible applications with Ext JS. Besides autosaving form elements and component state management, you will be able to take a look at the patterns for building your own custom components on top of the Ext framework, along with ways for modularizing your code.