Ext JS 4 Classe System

For the first time in its history, Ext JS went through a huge refactoring from the ground up with the new class system. The new architecture stands behind almost every single class written in Ext JS 4.x, hence it's important to understand it well before you start coding.

This manual is intended for any developer who wants to create new or extend existing classes in Ext JS 4.x. It's divided into 3 main sections:

• Section I: "Overview" explains the need for a robust class system
• Section II: "Naming Conventions" discusses the best practices for naming classes, methods, properties, variables and files.
• Section III: "Hands-on" provides detailed step-by-step code examples
• Section IV: "Errors Handling & Debugging" gives useful tips & tricks on how to deal with exceptions