fuyuko.net

I noticed “add to cart” (or “select option” for variable products) buttons are no longer there with the most recent version of WooCommerce.
I checked content-product.php to see if the button was removed…it was not according to their template comment:

/**
 * The template for displaying product content within loops
 *
 * This template can be overridden by copying it to yourtheme/woocommerce/content-product.php.
 *
 * HOWEVER, on occasion WooCommerce will need to update template files and you
 * (the theme developer) will need to copy the new files to your theme to
 * maintain compatibility. We try to do this as little as possible, but it does
 * happen. When this occurs the version of the template file will be bumped and
 * the readme will list any important changes.
 *
 * @see     https://docs.woocommerce.com/document/template-structure/
 * @author  WooThemes
 * @package WooCommerce/Templates
 * @version 3.0.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly
}

global $product;

// Ensure visibility
if ( empty( $product ) || ! $product->is_visible() ) {
	return;
}
?>
<li <?php post_class(); ?>>
	<?php
	/**
	 * woocommerce_before_shop_loop_item hook.
	 *
	 * @hooked woocommerce_template_loop_product_link_open - 10
	 */
	do_action( 'woocommerce_before_shop_loop_item' );

	/**
	 * woocommerce_before_shop_loop_item_title hook.
	 *
	 * @hooked woocommerce_show_product_loop_sale_flash - 10
	 * @hooked woocommerce_template_loop_product_thumbnail - 10
	 */
	do_action( 'woocommerce_before_shop_loop_item_title' );

	/**
	 * woocommerce_shop_loop_item_title hook.
	 *
	 * @hooked woocommerce_template_loop_product_title - 10
	 */
	do_action( 'woocommerce_shop_loop_item_title' );

	/**
	 * woocommerce_after_shop_loop_item_title hook.
	 *
	 * @hooked woocommerce_template_loop_rating - 5
	 * @hooked woocommerce_template_loop_price - 10
	 */
   
	do_action( 'woocommerce_after_shop_loop_item_title' );

	/**
	 * woocommerce_after_shop_loop_item hook.
	 *
	 * @hooked woocommerce_template_loop_product_link_close - 5
	 * @hooked woocommerce_template_loop_add_to_cart - 10
	 */
    
   	do_action( 'woocommerce_after_shop_loop_item' );
	?>
</li>

Regardless, the button is still not there so I added the button again in the current theme’s functions.php (since I wasn’t making any other overwrite):

//woocommerce - restore "add to cart" button in product category page
add_action( 'woocommerce_after_shop_loop_item', 'woocommerce_template_loop_add_to_cart', 20 );

And voila, it’s back.

The same disappearance behavior was observed in multiple themes…so I’m suspecting something happened in WooCommerce plugin (as opposed to a theme-related bug).