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Migration of Ext 3 to 4 application

It is possible to integrate Ext Js 4′s charts with an Ext JS 3 application. There is a demo of this on the main demos page (http://dev.sencha.com/deploy/ext-4.0.1/examples/sandbox/sandbox.html) which should show you how to integrate it.
We are very pleased to introduce several new resources that will assist in migrating existing Ext JS 3 applications to Ext JS 4, and will hopefully minimize the difficulty and effort involved. These are bundled in our new Ext JS 3 to 4 Migration Pack, the components of which are outlined below.
  • Ext JS 3 Compatibility Layer
  • Ext JS 3 to 4 Migration Guide
  • Ext JS Migration Demo App
  • Ext JS Migration Screencasts
I tried to look at the sample sandbox code; but it’s difficult to understand for the beginner. I will really appreciate if someone can provide me small working example like this:
var ext3Panel = new Ext.Panel({
title:’Ext3′
});
ext3Panel.on(‘afterrender’, function() {
var ext4Panel = Ext4.create(‘Ext.panel.Panel’, {
title:’Ext4′,
renderTo:ext3Panel.body.dom,
});
ext3Panel.add(ext4Panel);
});
I have read threads below:
http://stackoverflow.com/questions/6073241/adding-extjs4-components-to-extjs3-components
http://www.sencha.com/forum/archive/index.php/t-126391.html?s=883dcae1c09ec820e52fb96c737fe20f

Digging Deeper

Ext JS 4 introduces 4 new classes to make all this magic work:

  • Ext.Base – all classes inherit from Ext.Base. It provides basic low-level functionality used by all classes
  • Ext.Class – a factory for making new classes
  • Ext.ClassLoader – responsible for ensuring that classes are available, loading them if they aren’t on the page already
  • Ext.ClassManager – kicks off class creation and manages dependencies

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