如果 WooCommerce 中的购物车为空，则隐藏错误消息

Question

在 WooCommerce 中，我正在使用一个功能来显示错误消息并阻止结帐，如果来自一个特定类别的产品单独在购物车项目中。

但错误消息即使购物车是空的也会显示。

如果购物车为空，如何禁用此功能？

这是我的代码：

function sv_wc_prevent_checkout_for_category() {

    // set the slug of the category for which we disallow checkout
    $category = 'clothing';

    // get the product category
    $product_cat = get_term_by( 'slug', $category, 'product_cat' );

    // sanity check to prevent fatals if the term doesn't exist
    if ( is_wp_error( $product_cat ) ) {
        return;
    }

    $category_name = '<a href="' . get_term_link( $category, 'product_cat' ) . '">' . $product_cat->name . '</a>';

    // check if this category is the only thing in the cart
    if ( sv_wc_is_category_alone_in_cart( $category ) ) {

        // render a notice to explain why checkout is blocked
        wc_add_notice( sprintf( 'Hi there! Looks like your cart only contains products from the %1$s category &ndash; you must purchase a product from another category to check out.', $category_name ), 'error' );
    }
}
add_action( 'woocommerce_check_cart_items', 'sv_wc_prevent_checkout_for_category' );


/**
 * Checks if a cart contains exclusively products in a given category
 * 
 * @param string $category the slug of the product category
 * @return bool - true if the cart only contains the given category
 */
function sv_wc_is_category_alone_in_cart( $category ) {

    // check each cart item for our category
    foreach ( WC()->cart->get_cart() as $cart_item_key => $cart_item ) {

        // if a product is not in our category, bail out since we know the category is not alone
        if ( ! has_term( $category, 'product_cat', $cart_item['data']->id ) ) {
            return false;
        }
    }

    // if we're here, all items in the cart are in our category
    return true;
}

谢谢

Answer 1

为避免在购物车为空时显示错误消息，您需要以这种方式添加第一个函数条件 ! WC()->cart->is_empty()：

// Check if this category is the only thing in the cart (when cart is not empty)
if ( sv_wc_is_category_alone_in_cart( $category ) && ! WC()->cart->is_empty() ) { // <= <=

所以你的第一个函数代码将是：

function sv_wc_prevent_checkout_for_category() {

    // set the slug of the category for which we disallow checkout
    $category = 'clothing';

    // get the product category
    $product_cat = get_term_by( 'slug', $category, 'product_cat' );

    // sanity check to prevent fatals if the term doesn't exist
    if ( is_wp_error( $product_cat ) ) {
        return;
    }

    $category_name = '<a href="' . get_term_link( $category, 'product_cat' ) . '">' . $product_cat->name . '</a>';

    // Check if this category is the only thing in the cart (when cart is not empty)
    if ( sv_wc_is_category_alone_in_cart( $category ) && ! WC()->cart->is_empty() ) { // <==

        // render a notice to explain why checkout is blocked
        wc_add_notice( sprintf( 'Hi there! Looks like your cart only contains products from the %1$s category &ndash; you must purchase a product from another category to check out.', $category_name ), 'error' );
    }
}
add_action( 'woocommerce_check_cart_items', 'sv_wc_prevent_checkout_for_category' );