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Learning Ext JS 4 by Armando Gonzalez, Crysfel Villa

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Chapter 2. The Core Concepts

In this chapter we're going to learn about the new class system that version four introduces. There are a lot of new features to take advantage of in this version. We are also going to learn how to load classes dynamically and how to interact with the Document Object Model (DOM) to modify the structure of the tree to our convenience.

We should know that in JavaScript, classes don't exist; however we can emulate them using the prototype object and other techniques. One of the major features about Ext JS is the way we can emulate object-oriented programming.

It's important to mention that you should know and understand the concepts of object-oriented programming. In this chapter we are not going to explain the concepts, ...

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