Thanks for reaching out.
Could you please explain the problem in more detail?
If we talk about quick view product page, I would assume that clicking +/- would just change value in quantity box and would not call jQuery('.update-quantity').submit(); function.
The same happens when you change quantity manually there.
Originally Posted by Soptareanu @Alex
I put this function jQuery('.update-quantity').submit(); and it works. But i have problem in quick view page if a product has variants because the script is executed for each element and this cause a problem with my increment value (i).