joe1989

<div class="product" data-id="123">
    <!-- Инфо о продукте -->  
    <button class="action-buy">Buy</button>
</div>
    
<form action="#">
    <!-- Инпуты -->
    <div class="visual"></div>
    <input type="hidden" name="product-id" value="" />
</form>

(function($){
    $(document).ready(function() {
        var form = $('form');
        $('.product').each(function() {
        	var product = $(this);
            product.find('.action-buy').on('click', function() {
            	form.find('.visual').text(product.data('id'));
                form.find('input[name=product-id]').val(product.data('id'));
            })
        });
    });
})(jQuery);