Marcel Tannich

This plugin will hide the WooCommerce “Update Cart” button and reload the quantity changes dynamic over jQuery. You don’t need this extra click anymore!
This Plugin is based on a posting on StackExchange related to WordPress developers. I modified the basic concept and created a plugin out of it that WordPress users with less experience in PHP can integrate this function easily without destroying their functions.php file.
There are no options. Just activate the plugin and it will works.
<h3>Plugin Requirements</h3>
<ul>
<li>This plugin requires WordPress 4.9 or greater</li>
<li>This plugin requires WooCommerce 3.0.0</li>
<li>This plugin requires PHP 5.6 or greater</li>
</ul>

Dynamic Cart Quantity for WooCommerce

wooassist

This plugin displays the quantity field on the shop page of WooCommerce stores so customers can change the quantity before adding to cart.

Quantity Field on Shop Page for WooCommerce

This plugin displays the quantity field on the shop page of WooCommerce stores so customers can change the quantity before adding to cart.

Dynamic Cart Quantity for WooCommerce vs Quantity Field on Shop Page for WooCommerce