如果产品已在购物车中，请禁用 Woocommerce 添加到购物车按钮

2021-12-22 00:00:00 product php wordpress woocommerce hook-woocommerce

我正在尝试将 Woocommerce 中的添加到购物车"按钮上的功能设置为只允许将特定产品添加到购物车一次.

I am trying to set the functionality in Woocommerce on the Add to Cart button to only allow a particular product to be added once to the Cart.

第一次将特定产品添加到购物车后，需要隐藏添加到购物车.

Once a particular product has been added to cart the first time, the Add to Cart needs to be hidden.

在购物车中，我可以有任意数量的产品 - 每个产品最多只能有 1 个.

In the cart I can have any number of products - just a max of quantity 1 for each product.

我在做研究，发现我可以使用 woocommerce_add_to_cart_validation 钩子.但不知道如何开始.

I was doing research and saw that I can use woocommerce_add_to_cart_validation hook. But have no idea how to start off.

如何允许将特定产品添加到购物车一次?

How can I allow a particular product to be added once to the Cart?

推荐答案

如果产品在购物车中，则使用 woocommerce_is_purchasable 钩子禁用添加到购物车按钮:

Disable add to cart button if product is in cart using woocommerce_is_purchasable hook:

add_filter( 'woocommerce_is_purchasable', 'disable_add_to_cart_if_product_is_in_cart', 10, 2 );
function disable_add_to_cart_if_product_is_in_cart ( $is_purchasable, $product ){
    // Loop through cart items checking if the product is already in cart
    foreach ( WC()->cart->get_cart() as $cart_item ){
        if( $cart_item['data']->get_id() == $product->get_id() ) {
            return false;
        }
    }
    return $is_purchasable;
}

代码位于活动子主题(或活动主题)的 function.php 文件中.经测试且有效(即使对于可变产品中的产品变体).

Code goes in function.php file of your active child theme (or active theme). Tested and works (even for product variations in variable products).

原答案:这是一个使用 woocommerce_add_to_cart_validation 钩子的示例，它可以解决问题(防止添加到购物车操作并在需要时显示自定义通知)，并使用自定义实用程序功能删除您特定定义的数量字段产品编号:

Original answer: Here is an example using woocommerce_add_to_cart_validation hook and that will do the trick (preventing add to cart action and displaying a custom notice when needed), and using a custom utility function that will remove quantity field for your specific defined product ID: 

add_filter( 'woocommerce_add_to_cart_validation', 'limit_cart_items_from_category', 10, 3 );
function limit_cart_items_from_category ( $passed, $product_id, $quantity ){
    // HERE define your product ID
    $targeted_product_id = 37;

    // Check quantity and display notice
    if( $quantity > 1 && $targeted_product_id == $product_id ){
        wc_add_notice( __('Only one item quantity allowed for this product', 'woocommerce' ), 'error' );
        return false;
    }

    // Loop through cart items checking if the product is already in cart
    foreach ( WC()->cart->get_cart() as $cart_item ){
        if( $targeted_product_id == $product_id && $cart_item['data']->get_id() == $targeted_product_id ) {
            wc_add_notice( __('This product is already in cart (only one item is allowed).', 'woocommerce' ), 'error' );
            return false;
        }
    }
    return $passed;
}

// Checking and removing quantity field for a specific product 
add_filter( 'woocommerce_quantity_input_args', 'custom_quantity_input_args', 10, 2 );
function custom_quantity_input_args( $args, $product ) {
    // HERE define your product ID
    $targeted_product_id = 37;

    if( $targeted_product_id == $product->get_id() )
        $args['min_value'] = $args['max_value'] = $args['input_value'] = 1;

    return $args;
}

代码位于活动子主题(或活动主题)的 function.php 文件中.经测试有效.

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

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