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/** insert into CSS file first
*
*  button[name='update_cart'] {
*display: none !important;}
*
**/

add_action( 'wp_footer', 'bbloomer_cart_refresh_update_qty' ); 
 
function bbloomer_cart_refresh_update_qty() { 
   if (is_cart()) { 
      ?> 
      <script type="text/javascript"> 
         jQuery('div.woocommerce').on('click', 'input.qty', function(){ 
            jQuery("[name='update_cart']").trigger("click"); 
         }); 
      </script> 
      <?php 
   } 
}






// CORRECTION FOR DROPDOWN QUANTITIES
add_action( 'wp_footer', 'bbloomer_cart_refresh_update_qty' ); 
 
function bbloomer_cart_refresh_update_qty() { 
   if (is_cart()) { 
      ?> 
      <script type="text/javascript"> 
         jQuery('div.woocommerce').on('change', 'select', function(){ 
            jQuery("[name='update_cart']").trigger("click"); 
         }); 
      </script> 
      <?php 
   } 
}