How to implement this with cakephp

svaldenegro

Hi!
I'm doing a project with datatable and i just want to ask how to get just the needed data. For example i have so much registers but i want just to look for the registers needed by page, how could i make ajax to a controller that i've do wich gives data between certain rank and at certain amount.
For example page 2 and showing 15 elements per page will ask from row 15 to 30 and then get it and show it without need to load the complete table Json.