Change “add to cart” button for purchased products in Woocommerce

Question

What I would like to do is a this:

A customer buys a product. Instead of \"add to cart\" it would show \"See Digital Product\" and have a custom link to a specific pa

Answer 1

The following functions will check if a customer has already bought a product and if it is the case the add to cart button will be replaced by a custom "See Digital Product" linked button to "About" page.

The first function code is made from wc_customer_bought_product() source code, in a lighter way. The code will check for logged in users only, returning false for unlogged users.

function has_bought_item( $product_id ) {
    global $wpdb;

    if( ! is_user_logged_in() )
        return false;

    $customer_id = get_current_user_id();
    $statuses      = array_map( 'esc_sql', wc_get_is_paid_statuses() );

    // Count the number of products
    $count_query = $wpdb->get_var( "
        SELECT COUNT(woim.meta_value) FROM {$wpdb->prefix}posts AS p
        INNER JOIN {$wpdb->prefix}postmeta AS pm ON p.ID = pm.post_id
        INNER JOIN {$wpdb->prefix}woocommerce_order_items AS woi ON p.ID = woi.order_id
        INNER JOIN {$wpdb->prefix}woocommerce_order_itemmeta AS woim ON woi.order_item_id = woim.order_item_id
        WHERE p.post_status IN ( 'wc-" . implode( "','wc-", $statuses ) . "' )
        AND pm.meta_key = '_customer_user' AND pm.meta_value = $customer_id
        AND woim.meta_key IN ( '_product_id', '_variation_id' )
        AND woim.meta_value = $product_id
    " );

    // Return true boolean value if count is higher than 0, if not false
    return $count_query > 0 ? true : false;
}

// Shop and archives - Replace add to cart ajax button to a custom linked button
add_filter( 'woocommerce_loop_add_to_cart_link', 'replace_loop_add_to_cart', 20, 2 );
function replace_loop_add_to_cart( $html, $product ) {
    if( has_bought_item( $product->get_id() ) ) {
        $page = get_page_by_title( "About" );
        if ( ! is_object($page) )
            return $html;
        $link = get_permalink( $page->ID );
        $text = __("See Digital Product", "woocommerce");
        $html = '<a href="' . $link . '" class="button alt add_to_cart_button">' . $text . '</a>';
    }
    return $html;
}

// Single products: Replacing the button add to cart by a custom button on single product pages
add_action( 'woocommerce_single_product_summary', 'replace_single_add_to_cart_button', 1 );
function replace_single_add_to_cart_button() {
    global $product;

    if( has_bought_item( $product->get_id() ) && get_page_by_title( "About" ) ) {
        // For variable product types (keeping attribute select fields)
        if( $product->is_type( 'variable' ) ) {
            remove_action( 'woocommerce_single_variation', 'woocommerce_single_variation_add_to_cart_button', 20 );
            add_action( 'woocommerce_single_product_summary', 'custom_single_add_to_cart_button', 20 );
        }
        // For all other product types
        else {
            remove_action( 'woocommerce_single_product_summary', 'woocommerce_template_single_add_to_cart', 30 );
            add_action( 'woocommerce_single_product_summary', 'custom_single_add_to_cart_button', 30 );
        }
    }
}

// Utility function: displays a custom  button replacement
function custom_single_add_to_cart_button() {
    $page = get_page_by_title( "About" );
    if ( ! is_object($page) )
        return;
    $link = get_permalink( $page->ID );
    $text = __("See Digital Product", "woocommerce");
    echo '<a href="' . $link . '" class="button alt add_to_cart_button">' . $text . '</a>';
}

Code goes in function.php file of your active child theme (or active theme). Tested and works.

based on:

• Checking if customer has already bought something in WooCommerce
• Check if a customer has purchased a specific products in WooCommerce