Question

我正在尝试展示产品的变体是否已经在购物车中（在单个产品页面中）。产品ID与cart对象中的产品的简单比较不适用于变量产品，因为变量id是使用ajax加载的。

这是我的代码，适用于产品类型不是变量的情况。

<?php
/*
 * Check if Product Already In Cart
*/
function woo_in_cart( $product_id ) {
    global $woocommerce;

    if ( !isset($product_id) ) {
        return false;
    }

    foreach( $woocommerce->cart->get_cart() as $cart_item ) {
        if ( $cart_item['product_id'] === $product_id ){
            return true;
        } else {
            return false;
        }
    }
}

有没有办法让它在没有jQuery的情况下工作？

Answer 1

您的意思是$product_id可能是变体的ID吗？如果是这样，您可以获取父ID（如果存在）：

/*
 * Check if Product Already In Cart
 */
function woo_in_cart( $product_id ) {
    global $woocommerce;

    if ( ! isset( $product_id ) ) {
        return false;
    }

    $parent_id  = wp_get_post_parent_id( $product_id );
    $product_id = $parent_id > 0 ? $parent_id : $product_id;

    foreach ( $woocommerce->cart->get_cart() as $cart_item ) {
        if ( $cart_item['product_id'] === $product_id ) {
            return true;
        } else {
            return false;
        }
    }
}

如果您的购物车商品属于变体形式，并且$product_id已经是父产品ID，那么您的代码应该按原样运行。

$cart_item有2个ID：$cart_item['product_id']和$cart_item['variation_id']。

所以product_id始终是父产品的。{/ p>

Answer 2

处理单个产品页面之外的产品变化（以及各处的简单产品）：

// Check if Product Already In Cart (Work with product variations too)
function woo_in_cart( $product_id = 0 ) {
    $found = false;
    if ( isset($product_id) || 0 == $product_id )
        return $found;

    foreach( WC()->cart->get_cart() as $cart_item ) {
        if ( $cart_item['data']->get_id() == $product_id )
            $found = true;
    }
    return $found;
}

要处理单个产品页面内的产品差异，需要使用javascript。

以下示例将显示自定义消息，当所选变体已在购物车中时：

// Frontend: custom select field in variable products single pages
add_action( 'wp_footer', 'action_before_add_to_cart_button' );
function action_before_add_to_cart_button() {
    if( ! is_product() ) return;

    global $product;

    if( ! is_object($product) )
        $product = wc_get_product( get_the_id() );

    // Only for variable products when cart is not empty
    if( ! ( $product->is_type('variable') && ! WC()->cart->is_empty() ) ) return; // Exit

    $variation_ids_in_cart = array();

    // Loop through cart items
    foreach( WC()->cart->get_cart() as $cart_item ) {
        // Collecting product variation IDs if they are in cart for this variable product
        if ( $cart_item['variation_id'] > 0 && in_array( $cart_item['variation_id'], $product->get_children() ) )
            $variation_ids_in_cart[] = $cart_item['variation_id'];
    }

    // Only if a variation ID for this variable product is in cart
    if( sizeof($variation_ids_in_cart) == 0 ) return; // Exit

    // Message to be displayed (if the selected variation match with a variation in cart
    $message = __("my custom message goes here", "woocommerce");
    $message = '<p class="custom woocommerce-message" style="display:none;">'.$message.'</p>';

    // jQuery code
    ?>
    <script>
    (function($){
        // Utility function that check if variation match and display message
        function checkVariations(){
            var a = 'p.woocommerce-message.custom', b = false;
            $.each( <?php echo json_encode($variation_ids_in_cart); ?>, function( k, v ){
                if( $('input[name="variation_id"]').val() == v ) b = true;
            });
            if(b) $(a).show(); else $(a).hide();
        }

        // On load (when DOM is rendered)
        $('table.variations').after('<?php echo $message; ?>');
        setTimeout(function(){
            checkVariations();
        }, 800);

        // On live event: product attribute select fields "blur" event
        $('.variations select').blur( function(){
            checkVariations();
        });
    })(jQuery);
    </script>
    <?php
}

代码放在活动子主题（或活动主题）的function.php文件中。经过测试和工作。

检查Woocommerce中的产品变体是否在购物车中

2 个答案: