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Ext JS 4 First Look by Loiane Groner

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Migrating from Ext JS 3 to Ext JS 4

Ext JS 4 introduces major changes in its architecture, core system, and widgets. Most classes were refactored. We already know how the new class system works. We are going to introduce you to the new changes and new widgets. Also, there are some changes that are not compatible with Ext JS 3. To help you to migrate from Ext JS 3 to Ext JS 4, there are some tools that can help you.

Adapters

In previous versions of Ext JS, you were able to use Ext JS along with other third-party frameworks, such as jQuery, Prototype, and YUI, and Ext provided a special adapter so you could use these frameworks.

For example, if you want to use Ext along with jQuery, you have to import jQuery files, then ext-jquery-adapter.js , and ...

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