How to pass product ID to FANCYBOX3 modal window?

Question

JavaScript

Tell me please.
There is a product, when you click on it, a fancybox3 modal window opens with an order form. How to pass the product ID to this form, for example, in input type="hidden". Thank you very much in advance.

<a class="slide2-order" id="item1" data-fancybox data-src="#order-popup" href="javascript:;"></a>


 <div class="popup" id="order-popup">
    <form action="/send_form/send.php" method="post" enctype="multipart/form-data">
       <input type="hidden" value="ID товара">
    </form>
 </div>


 <script type="text/javascript">
             $("[data-fancybox]").fancybox({
          	});
          </script>

Answer 1

https://jsfiddle.net/skzhyeou/
fancybox beforeLoad event: fancyapps.com/fancybox/3/docs/#events
Working with jQuery data attributes: https://api.jquery.com/data/