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I need help with js on prestashop 1.7.

I want to create a button in product page that updates the number of products selected.

For example:


If I press red button, quantity_wanted box change to 5:


How to do that?

I suppose I need to modify /theme/_dev/js/product.js

with something like that:





The problem is JS doesn't work.

Any idea?

I need first steps to begin.




Edited by zell9999 (see edit history)

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