仅在购物车中有强制性类别的产品时才允许结帐 [英] Allow checkout only when a product of a mandatory category is in cart

问题描述

如果他们的购物篮中没有特定的产品类别，我想阻止任何提前进入结帐的客户.我还想通过一条错误消息告诉他们他们需要添加某种产品.我找到了一些代码，但无法正常工作.我已经将它作为代码段添加到了我的Wordpress安装中，但是可惜它不起作用，即使打开了调试功能，也没有错误消息.这是我在Github中找到的代码，可能需要对其进行修改才能使其正常工作:

I'd like to stop any customer advancing to the checkout if they do not have a particular product category in their basket. I would also like to tell them with an error message that they need to add a certain product. I've found some code but cannot it to work. I've added it as a code snippet into my Wordpress install but alas it does not function and there are no error messages even though I have debugging switched on. Here is the code that I have found in Github that may need modification in order for this to work:

function sv_wc_prevent_checkout_for_category() {

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

    // 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;
}

因此，如果同级"类别是购物车中唯一的商品，我希望停止结帐(并显示错误消息).我有一个标准"类别，该类别必须在客户进入结帐之前的购物篮中.希望这是有道理的.

So I'm looking to stop checkout (with error message) if the 'sibling' category is the only item in the cart. I have a 'standard' category which must be in the basket before the customer makes it to the checkout. Hope this makes sense.

推荐答案

在这里，您将找到解决问题的方法.特别是有两个主要功能(最后一个):

Here you have a solution that will make the trick. There is especially 2 main functions (the last ones):

1. 第一个功能(N°3)在购物车中有商品但不是必填产品类别时在购物车页面上显示您的消息.在必填产品归档页面上也显示消息(当客户从结帐处重定向时有用，请参见下文).
2. 第二个功能(N°4)在尝试结帐且他的购物车没有缺少必需品类别的情况下将客户重定向到产品必需品类别归档页面.

1. The first function (N°3) display your message on cart page, when there is something in cart but not the mandatory product category. Displays also the message on the mandatory product archive pages (useful when customer get redirected from checkout, see below).
2. The second function (N°4) redirect customer to the product mandatory category archive pages when it tries to checkout and his cart has not that missing mandatory product category.

在 your_mandatory_category_slug() 函数中的强制类别标记之前定义.

Define before your mandatory category slug in your_mandatory_category_slug() function.

这是代码:

// Function that define the mandatory product category
 function your_mandatory_category_slug(){

     // DEFINE HERE the SLUG of the needed product category
    $category = 'clothing';
    return $category;
 }


// Conditional function that returns true if the mandatory product category is in cart
function has_mandatory_category(){
    $category_needed = your_mandatory_category_slug();
    $has_cat = false;

    // Iterrating each item in cart and detecting…
    foreach ( WC()->cart->get_cart() as $item ) {

        // Detects if the needed product category is in cart items
        if ( has_term($category_needed, 'product_cat', $item['product_id'] ) ) {
            $has_cat = true;
            break;
        }
    }
    return $has_cat;
 }


// Function that display a message if there is not in cart a mandatory product category
function mandatory_category_display_message() {
        $category_needed = your_mandatory_category_slug();

    // check that cart is not empty (for cart and product category archives)
    if( !WC()->cart->is_empty() && ( is_cart() || is_product_category( $category_needed ) ) ){
        $category_obj = get_term_by( 'slug', $category_needed, 'product_cat' );
        if ( is_wp_error( $category_obj ) ) return;

        // Display message when product category is not in cart items
        if ( !has_mandatory_category() ) {
            $category_name = $category_obj->name;
            $category_url = get_term_link( $category_needed, 'product_cat' );

            // render a notice to explain why checkout is blocked
            wc_add_notice( sprintf( __( '<strong>Reminder:</strong> You have to add in your cart, a product from "%1$s" category, to be allowed to check out. Please return <a href="%2$s"> here to "%1$s" product page</a>', 'your_theme_domain'), $category_name, $category_url ), 'error' );
        }
    }
}
add_action( 'woocommerce_before_main_content', 'mandatory_category_display_message', 30 ); // for product mandatory category archives pages
add_action( 'woocommerce_check_cart_items', 'mandatory_category_display_message' ); // for cat page


// Function that redirect from checkout to mandatory product category archives pages
function mandatory_category_checkout_redirect() {

    // If cart is not empty on checkout page
    if( !WC()->cart->is_empty() && is_checkout() ){
        $category_needed = your_mandatory_category_slug();

        // If missing product category => redirect to the products category page
        if ( !has_mandatory_category() )
            wp_redirect( get_term_link( $category_needed, 'product_cat' ) );
    }
}
add_action('template_redirect', 'mandatory_category_checkout_redirect');

这会出现在您活动的子主题(或主题)的function.php文件中，也可能出现在任何插件文件中.

此代码已经过测试，功能齐全.

This code is tested and fully functional.

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