A Log on JavaScript

Well, if you are programming in JavaScript for a while, you are familiar with the arguments ‘array’ which gives you access to function arguments by index, without the need of argument names. And if you are programming JavaScript for a bit longer while, you will know that arguments is not even a normal array. It [...]

You should make use of the scope config option in components
.

in Ajax calls
var MyPanel = Ext.extend(Ext.Panel, {
doSave: function(){
Ext.Ajax.request({
url: ‘your_url’,
params: ….
success: function(response){
response = Ext.decode(response.responseText);
this.onSuccess(response)
},
scope: this //the scope in which the success callback [...]

This article explains how you can achieve powerful object oriented JavaScript with the help of ExtJS Core library. Good points on inheritance, overriding, flexibility, possible pitfalls that come with this approach. A good way to start building one page JavaScript web applications.

What is really fascinating about JavaScript is it’s dynamic nature. You can dynamically change the behaviour of the code… even not your code. While this is really powerful, it can be also a pain if not used with care.