Front-end processes before back-end?

Question

I noticed on most modern web apps that front-end processing (like in the case of pushing a button) usually occurs before back-end processing, and if the back-end process fails, it throws some kind of exception which returns the front-end to its previous state. What is this technique/feature called and where can I learn more about it? Thank you.

Answer 1

I think you are talking about ajax technology, full meaning is asynchronous JavaScript and XML . Ajax is a pure javascript technique. If you learn jQuery, Ajax will be easy for you. Google 'ajax' and you will find a lot of documentation on ajax.