How to Add Quantity Field On Shop Page for WooCommerce

function qaisarsatti_loop_quantity_input() {
    global $product;

    if ( $product && $product->is_purchasable() && $product->is_type( 'simple' ) && $product->is_in_stock() && ! $product->is_sold_individually() ) {
        woocommerce_quantity_input(
            array(
                'min_value' => 1,
                'max_value' => $product->backorders_allowed() ? '' : $product->get_stock_quantity(),
            )
        );
    }
}
add_action( 'woocommerce_after_shop_loop_item', 'qaisarsatti_loop_quantity_input', 9 );

function qaisarsatti_add_qty_change_script() {
    ?>
    <script>
        (function ($) {
            $(document).on("change", "li.product .quantity input.qty", function (e) {
                e.preventDefault();
                var add_to_cart_button = $(this).closest("li.product").find("a.add_to_cart_button");
                // For AJAX add-to-cart actions.
                add_to_cart_button.attr("data-quantity", $(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=" + $(this).val());
            });
        })(jQuery);
    </script>
    <?php
}
add_action( 'wp_head', 'qaisarsatti_add_qty_change_script', 20 );