tap/app/views/orders/order.html.erb

<%= current_ordering_user.name %>

<% @products.each do |p| %>
  <%#= render "orders/order_button" %>

  <!-- dit moet in een andere file -->
  <button class="btn btn-default product-btn"
          data-name= '<%= p.name  %>'
          date-price= '<%= p.sale_price %>'>
    <%= p.name %>
  </button>
  <!-- tot hier -->

<% end %>





<%= form_for @order do |f| %>
  <div class="field">
    <%= f.text_area :products , placeholder: "dit zou een hidden field moeten zijn met product JSON..." %>
  </div>
  <%#= hidden_field_tag "products", "return_products_string"  %>
  <div class="hidden"></div>

  <%= f.submit "Order", class: "btn btn-primary " %>
<% end %>


<div style="padding-top: 50px;" class="order_list ">
  <p>
    Nothing ordered yet!
  </p>
</div>



<script charset="utf-8">

  var products = {};
  //var product_number = 0;



  $(document).ready(function() {

    //Making/adding orderlist/JSON
    $('.product-btn').click(function() {
      //product_number++;
      var name = $(this).data('name');
      var price = $(this).data('price');

      if(products.hasOwnProperty(name)){
        products[name].number_of++;
      } else{
        products[name] = {
          name : name,
          price : price,
          number_of: 1
        }
      }
      update();
    });




    //updates the orderlist view
    var update = function(){
      $('.order_list').empty().append("<p>Ordered: </p>"  );
      jQuery.each(products, function(i, product) {
        $(".order_list").append("<p> - "+ i +": "+ product.number_of +"</p>");
      });
      //$('.hidden').empty().append("<input id='products' name='products' type='hidden' value='test' />")

    }




  });






</script>