wordpress woocommerce. how to add ajax input for selecting the quantity of goods after clicking the buy button?

Question

JavaScript

You need to add an input for choosing the quantity of goods as in the basket, immediately after you clicked the add to cart button, it displays the amount of already added goods if you clicked + then +1 the amount of goods added to the cart.

Example:

Answer 1

Everything is working
That's just not right to produce so many elements with the same id!
Wouldn't it be better to do this: