I have a simple text field on my product page as default and i am trying to add a quantity button to increment and decrement as quantity box using KnockoutJS . I think adding a quantity button provide customers an option to easily add quantity for products. But i have been stuck somewhere as i don't know why the button is not functioning properly after clicking. I have followed this tutorial https://magenticians.com/quantity-increment-decrement-magento-2/ . Is there anything missing ?