I have an older T4 app that I'm going to upgrade to T5. It's not a full RIA but nevertheless a fairly fancy, interactive web app with drag & drop, ajax file uploads etc. The UI of the app was based on Prototype and Dojo 0.4.3 which served me well at the time despite of being a bit on the heavy side. I haven't really used JQuery in production apps yet but I wouldn't mind switching but if I do, I don't want to drag Prototype around with it. There are T5 integration libs available both for a newer version of Dojo and for JQuery. It might be marginally easier to adjust the existing Javascript for Dojo than having to rewrite everything with JQuery but as said, I'm fine with the cost. Performance always matters, so load times, execution performance, ability to use CDN etc. all matter. I don't mind filing an occasional issue, but I don't want to get sucked into seriously having to debug and maintain another add-on library so I'd prefer something relatively stable even if it didn't have all the latest bells and whistles. Of ready-made components, only a good, skinnable, customizable and extensible tab component is relevant to me. Now, why would I choose JQuery over the other choices? I'd really love to hear comments from people who've had experience of multiple Javascript libraries and have made a switch to JQuery or perhaps gone the other way.
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