How to change product price before add to cart with input field

[leowakgg]

// I apologize for my english

// I'm using prestashop 1.7.2

 

Hi,

I'm trying to add a product to cart with a custom price from an input field.

 

 

I'm thinking about 2 solutions :

 

- I found on a topic a trick with the specific price which allow to change the price just before adding to the cart, BUT i'm facing a problem with this method :

 

I don't know how to call the php function which do the specific price stuff in my template.

I already tryed a

<button onclick="{MyController::myfunction(param1, param2 ...)}">Add</button>

in product-add-to-cart.tpl but the code is already interpreted when the page is charging (onclick event is useless).

 

How can i call my function by pressing the add to cart button ?

 

 

- Another solution could be to create a duplicate product with a custom price , each time the input price is filled and the add to cart button pressed.

 

I don't know how to achieve this, the problem is a bit similar to the first solution : how to call the function which create the new product when i press add to cart button ?

 

 

I hope my ideas were clear,

Thanks for help