WooCommerce-AJAX添加到购物车中不存储产品元数据

Question

我已经在WooCommerce上成功实现了AJAX添加到购物车功能，该功能适用​​于单个产品和可变产品。

尝试将自定义产品数据添加到购物车时会出现问题。 “产品交货日期”插件，可在产品单页上添加一个日期选择器框，允许用户选择产品的交货日期。尚未将此数据添加到购物车。

我已经测试了Storefront主题，并且产品meta已存储在购物车中，所以我确定这与传递给AJAX函数的var有关。

我的AJAX知识是基础知识，因此，如果我缺少明显的内容，请原谅我。

JS用于添加到购物车：

jQuery(document).ready(function() {
  jQuery('.single_add_to_cart_button').click(function(e) {
  e.preventDefault();
  jQuery(this).addClass('adding-cart');
  var product_id = jQuery(this).val();
  var variation_id = jQuery('input[name="variation_id"]').val();
  var quantity = jQuery('select[name="quantity"]').val();
  console.log(quantity);
  jQuery('.cart-dropdown-inner').empty();

  if (variation_id != '') {
    jQuery.ajax ({
      url: crispshop_ajax_object.ajax_url,
      type:'POST',
      data:'action=crispshop_add_cart_single&product_id=' + product_id + '&variation_id=' + variation_id + '&quantity=' + quantity,

      success:function(results) {
        jQuery('.cart-dropdown-inner').append(results);
        var cartcount = jQuery('.item-count').html();
        jQuery('.cart-totals').html(cartcount);
        jQuery('.single_add_to_cart_button').removeClass('adding-cart');
        // jQuery('html, body').animate({ scrollTop: 0 }, 'slow');
        jQuery('body').addClass('cart-active');

      }
    });
  } else {
    jQuery.ajax ({
      url: crispshop_ajax_object.ajax_url,
      type:'POST',
      data:'action=crispshop_add_cart_single&product_id=' + product_id + '&quantity=' + quantity,

      success:function(data) {
        console.log(results);
        jQuery('.cart-dropdown-inner').append(results);
        var cartcount = jQuery('.item-count').html();
        jQuery('.cart-totals').html(cartcount);
        jQuery('.single_add_to_cart_button').removeClass('adding-cart');
        // jQuery('html, body').animate({ scrollTop: 0 }, 'slow');
        jQuery('body').addClass('cart-active');

      }
    });
  }
});


});

PHP用于添加到购物车：

function crispshop_add_cart_single_ajax() {
	$product_id = $_POST['product_id'];
	$variation_id = $_POST['variation_id'];
  $variation  = $_POST['variation'];
	$quantity = $_POST['quantity'];

	if ($variation_id) {
		WC()->cart->add_to_cart( $product_id, $quantity, $variation_id, $variation);
	} else {
		WC()->cart->add_to_cart( $product_id, $quantity);
	}

	$items = WC()->cart->get_cart();
	$item_count = count($items); ?>

	<span class="hide item-count"><?php echo $item_count; ?></span>

  <div class="flex items-center justify-between">
    <h4 class="h4 grey">Bag</h4>
    <div class="exit">&#215;</div>
  </div>

  <div class="cart-details">
    <div class="flex justify-between item-headers pt3 pb1">
      <span class="h6 grey block item-title">Item</span>
      <span class="h6 grey block quantity-title">Quantity</span>
      <span class="h6 grey block price-title">Price</span>
    </div>
   	<?php foreach($items as $item => $values) {
	 $_product = $values['data']->post; ?>

		<div class="dropdown-cart-wrap">
      <div class="dropdown-cart-left">
        <?php $variation = $values['variation_id']; ?>
      </div>

			<div class="dropdown-cart-right flex justify-between items-center">
        <div class="items">
          <h5 class="h6 grey block"><?php echo $_product->post_title; ?></h5>
        </div>

        <div class="quantites">
          <span class="block select-qty select-qty--dis">

            <?php echo $values['quantity']; ?>
          </span>
        </div>

        <div class="prices">
          <?php global $woocommerce;
          $currency = get_woocommerce_currency_symbol();
          $price = get_post_meta( $values['product_id'], '_regular_price', true);
          $sale = get_post_meta( $values['product_id'], '_sale_price', true);
          $varPrice = get_post_meta( $variation, '_regular_price', true);

          ?>

          <?php if($sale) { ?>
            <span class="h6 grey price"><strong></strong> <del><?php echo $currency; echo $price; ?></del> <?php echo $currency; echo $sale; ?></span>
          <?php } if($price) { ?>
            <span class="h6 grey price"><strong></strong> <?php echo $currency; echo $price; ?></span>
          <?php } if($varPrice) { ?>
            <span class="h6 grey price"><strong></strong> <?php echo $currency; echo $varPrice; ?></span>
        <?php } ?>
        </div>
			</div>

		</div>
	<?php } ?>

  <div class="flex justify-between items-center py2">
      <h6 class="h6 grey">Subtotal</h6>
      <h6 class="h6 grey"><?php echo WC()->cart->get_cart_total(); ?></h6>
  </div>

	<?php $cart_url = $woocommerce->cart->get_cart_url();
	$checkout_url = $woocommerce->cart->get_checkout_url(); ?>

  <div class="dropdown-cart-wrap dropdown-cart-links">
    <div class="">
      <!-- <a href="<?php echo $cart_url; ?>">View Cart</a> -->
      <a class="btn btn--dark block" href="<?php echo $checkout_url; ?>">Checkout</a>
    </div>

  </div>
  </div>
</div>

	<?php die();
}

在此先感谢您的帮助！