custom atribute: TextField

I need text-field as a custom atribute:

I will add to some of my products two text-fields ( i.e: surname and name) or only one (i.e name).

These text-fields must be hidden or inactive (text-field in grey) until in a previous drop-text menu is selected "customize". (I atach example)

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Specifications:

1-One atribute will be a dropbox:

A.-One dropbox value will show (or activate) two new textfields for some products. (First for 15 char, Second for 2 char)

B.-Another dropbox value will show (or activate) one new textfield for other diferent products. ( 2 char)

2 - Not all the products are customizable

3 - This values must be shown by customer in cart review and paying process(like any atribute)

4 - No required to press a save button after inserting the text in text-fields (No like the PS default customization option)

5 - The shop is now in local machine. I must be able to insert the modified code (or new *.tpl, *.php) by myself.

6 - Checking if the textfields have been filled up before adding to cart.

Project very open to suggestions and flexible to have little changes in specification.

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CMS Prestashop Shopping Carts Smarty PHP Website Design

Project ID: #4054131

About the project