Help with form update Php, ajax form and bootstrap

Job ID: 35147218

Budget: $30 – $250 USD

PHP and Ajax help:

I have tried to develop a board designer, where customers can fill in heigh and width and color, and add product to basket.

1) I want the form to update without submit when entering a value (onfocusedout) (without reload).

2) I want it to be responsive design with bootstrap
Se the page here, that I want help with:
https://square.tavleberegner.dk/size.php

The coding has to be very simple, so I can chance it after
Can anyone help?

Best from Kristian
Related categories: PHP JavaScript AJAX HTML jQuery / Prototype