Plus-Minus Quantity Buttons WooCommerce Product Page & Cart page

/**
 * @snippet       Plus+ Minus- Quantity Buttons WooCommerce Product Page & Cart page
 */
  
// -------------
// 1. Show plus minus buttons
  
add_action( 'woocommerce_after_quantity_input_field', 'qortechno_display_quantity_plus' );
  
function qortechno_display_quantity_plus() {
   echo '<button type="button" class="plus">+</button>';
}
  
add_action( 'woocommerce_before_quantity_input_field', 'qortechno_display_quantity_minus' );
  
function qortechno_display_quantity_minus() {
   echo '<button type="button" class="minus">-</button>';
}
  
// -------------
// 2. Trigger update quantity script
  
add_action( 'wp_footer', 'qortechno_add_cart_quantity_plus_minus' );
  
function qortechno_add_cart_quantity_plus_minus() {
 
   if ( ! is_product() && ! is_cart() ) return;
    
   wc_enqueue_js( "           
      $(document).on( 'click', 'button.plus, button.minus', function() {
  
         var qty = $( this ).parent( '.quantity' ).find( '.qty' );
         var val = parseFloat(qty.val());
         var max = parseFloat(qty.attr( 'max' ));
         var min = parseFloat(qty.attr( 'min' ));
         var step = parseFloat(qty.attr( 'step' ));
 
         if ( $( this ).is( '.plus' ) ) {
            if ( max && ( max <= val ) ) {
               qty.val( max ).change();
            } else {
               qty.val( val + step ).change();
            }
         } else {
            if ( min && ( min >= val ) ) {
               qty.val( min ).change();
            } else if ( val > 1 ) {
               qty.val( val - step ).change();
            }
         }
 
      });
        
   " );
}