
/**
 * Add quantity field on the archive page.
 */
function custom_quantity_field_archive() {
	$product = wc_get_product( get_the_ID() );
	if ( ! $product->is_sold_individually() && 'variable' != $product->product_type && $product->is_purchasable() ) {
		woocommerce_quantity_input( array( 'min_value' => 1, 'max_value' => $product->backorders_allowed() ? '' : $product->get_stock_quantity() ) );
	}
}
add_action( 'woocommerce_after_shop_loop_item', 'custom_quantity_field_archive', 0, 9 );
/**
 * Add requires JavaScript.
 */
function custom_add_to_cart_quantity_handler() {
	wc_enqueue_js( '
		jQuery( ".post-type-archive-product" ).on( "click", ".quantity input", function() {
			return false;
		});
		jQuery( ".post-type-archive-product" ).on( "change input", ".quantity .qty", function() {
			var add_to_cart_button = jQuery( this ).parents( ".product" ).find( ".add_to_cart_button" );
			// For AJAX add-to-cart actions
			add_to_cart_button.data( "quantity", jQuery( this ).val() );
			// For non-AJAX add-to-cart actions
			add_to_cart_button.attr( "href", "?add-to-cart=" + add_to_cart_button.attr( "data-product_id" ) + "&quantity=" + jQuery( this ).val() );
		});
	' );
}
add_action( 'init', 'custom_add_to_cart_quantity_handler' );