ExtJS is object oriented, intuitive, very extensive, great DOM manipulation, solid effects. Ext JS 4 brings a whole new way to build client applications, by introducing the popular model-view-controller pattern to Ext JS.
I am a very passionate Java EE web developer, with more than 4 years of experience, ExtJS being my favourite Javascript framework.
Ladies and gentlemen, I’m very proud and excited to announce the beta release of ExtJS 5 which comes with a lot of new features and improvements:
Tablet support and new themes
New Application Architecture: MVVM (standing for Model-View-ViewModel)
MVC improvements
Routing
Data Package Improvements
Model Validation Binding
Event System
Sencha Charts
Grids (easier to add new components to grids)
Widgets
Form Package Improvements
Dashboards
and much more… see the entire list with examples and documentation here: http://docs.sencha.com/extjs/5.0.0/whats_new/5.0/whats_new.html
ExtJS is a commercial framework. Ext JS 4.2.1 is also available under the GPLv3 for open source projects, which may require the release of your code. Public releases of Sencha Touch, Sencha Touch Charts, Sencha Ext JS and Sencha GXT are all available under GPL v3. Sencha Touch Grid, Sencha Architect, and Sencha Cmd are only available under a Sencha commercial license and are not available under any open source license. More about the open source license here: http://www.sencha.com/legal/open-source-faq/
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