How to use AJAX on WordPress
If you already know what is an AJAX request please just jump right to the section where I will talk about how to start coding.
What is an AJAX request
First you will need to understand that an AJAX request is nothing more then a simple GET or POST to an URL that you defined, you will pass some parameters and this URL should answer you with some other data that you will be able to parse on the JavaScript and using it you will be able to give your users the needed visual feedback.