WooCommerce Custom Add To Cart

add-to-cart.php

<?php
/**
 * Custom Loop Add to Cart.
 *
 * Template with quantity and ajax.
 */
if (!defined('ABSPATH'))
    exit; // Exit if accessed directly.

global $product;
?>

<?php if (!$product->is_in_stock()) : ?>

    <a href="<?php echo apply_filters('out_of_stock_add_to_cart_url', get_permalink($product->id)); ?>" class="button">
        <?php echo apply_filters('out_of_stock_add_to_cart_text', __('Out of Stock', 'woocommerce')); ?>
    </a>

<?php else : 
    
    $link = array(
        'url' => '',
        'label' => '',
        'class' => ''
    );

    switch ($product->product_type) {
        case "variable" :
            $link['url'] = apply_filters('variable_add_to_cart_url', get_permalink($product->id));
            $link['label'] = apply_filters('variable_add_to_cart_text', __('Select options', 'woocommerce'));
            break;
        case "grouped" :
            $link['url'] = apply_filters('grouped_add_to_cart_url', get_permalink($product->id));
            $link['label'] = apply_filters('grouped_add_to_cart_text', __('View options', 'woocommerce'));
            break;
        case "external" :
            $link['url'] = apply_filters('external_add_to_cart_url', get_permalink($product->id));
            $link['label'] = apply_filters('external_add_to_cart_text', __('Read More', 'woocommerce'));
            break;
        default :
            if ($product->is_purchasable()) {
                $link['url'] = apply_filters('add_to_cart_url', esc_url($product->add_to_cart_url()));
                $link['label'] = apply_filters('add_to_cart_text', __('Add to cart', 'woocommerce'));
                $link['class'] = apply_filters('add_to_cart_class', 'add_to_cart_button');
            } else {
                $link['url'] = apply_filters('not_purchasable_url', get_permalink($product->id));
                $link['label'] = apply_filters('not_purchasable_text', __('Read More', 'woocommerce'));
            }	
            break;
    }

    // If there is a simple product.
    if ($product->product_type == 'simple') {
    ?>
        <form action="<?php echo esc_url($product->add_to_cart_url()); ?>" class="cart" method="post" enctype="multipart/form-data">
            <?php
            // Displays the quantity box.
            // Do not display when no price
            if($product->get_price_html() !== ''){
            woocommerce_quantity_input();

            // Display the submit button.
            echo sprintf('<button type="submit" data-product_id="%s" data-product_sku="%s" data-quantity="1" class="%s button product_type_simple">%s</button>', esc_attr($product->id), esc_attr($product->get_sku()), esc_attr($link['class']), esc_html($link['label']));
            }
            ?>
        </form>
        <?php
    } else {
        echo apply_filters('woocommerce_loop_add_to_cart_link', sprintf('<a href="%s" rel="nofollow" data-product_id="%s" data-product_sku="%s" class="%s button product_type_%s">%s</a>', esc_url($link['url']), esc_attr($product->id), esc_attr($product->get_sku()), esc_attr($link['class']), esc_attr($product->product_type), esc_html($link['label'])), $product, $link);
    }
    ?>

<?php endif;