Among the few more advanced texts available, is Professional jQuery by Cesar Otero and Rob Larsen. Professional jQuery with its 300+ pages is a great book for people like me, who have read several introductory books and have mastered the basics, but really need to learn more to go from being barely able to write jQuery code to becoming proficient at it.
The subjects I personally found very interesting were the chapters about jQuery UI – about making things look slick – and “Writing Effective jQuery Code”. I have for quite some time been interested in the principles of effective or efficient CSS, and I liked the arguments and test results provided by Otero and Larsen. In a language where there are many alternative ways to get something done, it is incredibly important to know which of the ways is the best and which produce performance disasters.
For the right reader this is almost an ideal book – it gives a lot of information on “smart” ways of working with jQuery, is very concerned with quality, optimization and efficiency, and covers a lot of ground. I felt that the emphases were very appropriate. The division of the material into two parts, jQuery Fundamentals and Applied jQuery, also works well. Also, the book is quite well written and has relatively interesting examples. I recommend Professional jQuery – this is a great book for people in the process of learning jQuery who want to take a step up the ladder!