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ExtJS is nice but expensive and has a very restrictive licensing scheme.
KendoUI doesn't look as nice as ExtJS, but still has a fairly good list of UI controls.
jQueryUI just doesn't have very many controls.
What is the HN community using in this space?
Now, "best" is relative, depending on your goals. Both of our frameworks, Ext JS and Sencha Touch, include every bit you need to make an app: Layout system, UI widgets, MVC, data binding, templates, I could go on. We also include a build system, so you can only use the pieces you need, so, even with all that we offer, your app is not "bloated."
That said, there are pros and cons to modularity vs. a unified system. There are some great microlibs out there, and independent devs are in an exciting stage right now, being able to mix and match frameworks as they see fit. From a team-based or enterprise perspective, though, this is not ideal: You are working with various APIs, certain frameworks can have duplicate code (ie. there's overlap in what jQuery and Underscore provide), and you're relying on individual devs or the open source community for fixes and enhancements. It's also a bit of a testing nightmare, as you need to re-test every time you update an individual component.
Also, we have a JavaScript-based API to creating things with our framework, which is quite different to the progressive enhancement method of other frameworks. The benefit to this, again, is performance, and a better architecture for an application. On the downside, this can be harder for novice web developers (those who focus on HTML/CSS instead of JavaScript).
At any rate, hope that helps some in making your decision. Let me know if you have any other questions-
Kendo UI is a relatively new entry in the HTML/JS UI space, but the engineering is based on over a decade of building professional UI for the web. We are working hard to build a complete framework that has everything you need to build sites and mobile apps with HTML5 and JavaScript.
Some of our advantages: - Based on jQuery (familiar & less overhead for jQuery fans) - Built for performance (JSPerf us against anyone. We're fast.) - Clean, simple, easy to learn API - Lightweight and modular (use what you need) - Aggressive roadmap (3 major releases each year) - Affordably priced ($399 with a year of updates/support!)
We just shipped a beta of Kendo UI Mobile, and our next major release will happen in March. The best way to compare Kendo UI, though, is to download it and give it a try. It's fun to use and I think you'll enjoy the developer experience.
http://www.kendoui.com/get-kendo-ui
Hope that helps.
-Todd Anglin @toddanglin
Dojo has some nice widgets: http://dojotoolkit.org/widgets