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I was learning jQuery and am still learning it. And then heard about extjs. extjs has its own ways of doing similiar things in jQuery and i dont feel i can remember both at one time. My Question is should i be learning about as many libraries as they evolve or should i just concentrate on one and be deprived of extra features the new one is introducing.
I’m using both, ExtJS for full web apps (RIAs) and jQuery for web site enhancements.
I tried using ExtCore (the LGPL part of ExtJS, limited to dom queries, animations, … It’s not as usable as jQuery.
But I wouldn’t try building a RIA with jQuery.
And ExtJS4 will be awesome (but this is another subject).
So, to answer your question, yes you can learn both, the fundamentals are quite the same, features are quite different, and remember : they are framework for the same language and environment, I mean javascript and Browser.