by alvinmuthui on WordPress.org
Adds Ajax in WordPress with a few lines of code. Adding Ajax is now simple as calling toria_add_ajax($action_name, $php_callback, $js_script_path) fun …

Sample theme functions PHP code
Developers can now add Ajax by passing three parameters (name of action, PHP callback, and javascript path) to the toria_add_ajax() function using the Tori Ajax plugin.
Please check out the Tori Ajax plugin Documentation
This is an easy-to-use dev tool for adding Ajax in word press.