Prestashop - Sell product by length - repost

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I want to be able to sell a product by length and i want to keep the quantity field.

The customer will enter desired length and it will have impact on the price.

The impact value will be different on each product.

I want the price to automatically change while typing in the text box.

Calculation part:
Product fixed price + ( "Entered Length" x Attribute(price impact) )

The solution have to be bug free and work all the way from product page to back office...

Version of prestashop 1.5.3

Skills required:
Additional Files: solution.png
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