Looking for recommnedation on JavaScript libraries in the leage of ExtJS and Qooxdoo for serious web application [closed]

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I'm looking for a JavaScript library for my web application. The application is very data intensive and has rich form controls (almost windows like). AJAX will be used liberally. The development platform is ASP.Net (mostly ASP.Net MVC will be used).

I cannot pursue with ExtJs due to the price/license factor. I checked Qooxdoo but it is very windows-unfriendly. YIU fell short of my needs w.r.t. form controls it offers.

Other libraries like jQuery do not offer rich form controls. So I am looking recommendations for a library t开发者_如何学Pythonhat satisfies most of following needs:

• Rich UI controls
• Solid API for AJAX handling
• Employs good programming practices for scripting in frontend (preferably OO but not mandatory)
• Free. Else has only development cost and not production
• Windows friendly (or at least not unfriendly)
• Not monolithic.
• Should be independent (Not have development & production dependencies)
• Theme'ing should be easy (preferably wrapped by the library)

I am not mentioning other basic needs (like browser compatibility). I hope any popular library will honor those.

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What's wrong with the GPL version of ExtJS? It's free.

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SmartClient offers LGPL licensing, and I think caters to most, if not all, of your requirements (I don't remember for sure if they provide a non-monolithic option - I think they do)