Set minimum & maximum total amount in cart

Hi everyone,

I want to set a minimum and maximum amount a customer can buy on my store. (for delivery purposes).

First I will look for the ajax “add to cart” function.
Then I will add a condition like : “if total_cart is greater than 10 & lower than 100”.
With the possibility to disable the “add to cart” button when amount is triggered with an error message.

How can I do that? I really need help on this one.

Thank you!