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Flex vs ExtJS for the internal interface of the system, what are their strengths and weaknesses?

Looking back at the back-end system I just built, a generic server / page model with little use of Ajax for some user interface components. I am not sure if I am satisfied with the result, because it seems that we spent too much time on the interface. Not a big fan of all the styling and CSS styling issues.

So, I started to think if there are better tools for the interface?

How to compare Flex and ExtJS? perhaps in these areas?

  • learning curve
  • functionality
  • layout (no CSS support)
  • ease of implementation
  • verifiability (TDD in Javascript vs in ActionScript?)
  • performance
  • maintainability

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Despite the fact that many HTML5 frameworks are available, Ext is really a good transition for Flex developers (they told me that I never used Flex). The component model, user interface widgets, layout concepts, and general development styles are pretty similar, and the Flex developers I worked with tend to understand Ext concepts quite easily.

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