Each of these frameworks is pretty good but none is perfect. Although none of them met all our requirements, Dojo was clearly the best fit due to its extensive set of rich widgets and form controls.
However, as I mentioned, no framework is perfect. Unfortunately Dojo’s most lacking feature is its documentation which at present is scarce, sparse and sometimes confusing. Even books written for the framework lack specificity and leave out the most useful options and tricks that you'd expect to find there. For us, most of the time the best documentation has been the source code itself which we have had to read/decipher to figure out how to do what we wanted to do. In this respect we have sometimes struggled with the framework so here I give you some resources that might help you deal with the framework and in some cases, avoid end roads. I hope you find these useful:
The source code – Unfortunately, I have to say that sometimes the only way to understand what the framework is doing is by reading the source itself. When doing this, make sure you look for the files named uncompressed which give you the human readable version of the code.
As a side note, we used to include EXT as our main js framework. Personally, I think there is no other framework out there that can beat the EXT widget set and documentation. However, sadly they've decided to change the licensing and make it a closed framework (it used to be GPL). We know they offer dual licensing where open source projects like dotCMS could include EXT under GPL3 license, however this move didn’t give us any confidence about the future of the framework as an open source project, so sadly we just decided to replace it.
Drawbacks aside, we are glad we have embraced the Dojo toolkit . It’s a pretty exciting moment at dotCMS and we are making sure to continually offer you a more streamlined and compelling experience when it comes to managing your website.