I believe Ext.js was using jQuery, but I\'m not sure. Does anyone know if there is full compatibility with jQuery and Ext.js?
Ext.js is completely independent of jQuery and as such does not rely on jQuery in any way. Don't know what you mean by 'full compatibility' but you can use both on the same page as they don't interfere with each other.
As Ext.js doesn't use the $
-function, you don't even have to do any special trickery to get them to work together, as is the case with using Prototype with jQuery, for example.