Kendo MultiSelect - 选择值发送到控制器方法MVC

Question

在表单中我有一个kendo MultiSelect，允许您为订单选择几个附加组件。选择后，我想显示附加组件的价格但不知何故我不这样做。

显示所选加载项的值没有任何问题，当我想显示从控制器获取GET所需的价格时会出现问题。 控制器中的方法返回一个int值。

有人能指引我朝正确的方向前进吗？

function onChange(e) {
        var multiselect = $("#accessoriesCombo").data("kendoMultiSelect");
        var accessoriesLabel = $("#accessoriesLabel");
        var startDate = $("#rentStartPicker").data("kendoDateTimePicker").value();
        var endDate = $("#rentEndPicker").data("kendoDateTimePicker").value();
        var diffDay;

        if (calculate(startDate, endDate) < 1) {
            diffDay = calculate(startDate, endDate) + 1;
        } else {
            diffDay = calculate(startDate, endDate);
        }
        var textValues = "";
        var arrayValues = this.value();
        var total = 0;
        arrayValues.forEach(function (item) {
            textValues += item;
            total += getPrice(item, diffDay);
        });
        
        accessoriesLabel.text(textValues + " (" + total + ")");    
    }

    function getPrice(id, numberOgDays) {
        var returnPrice = 0;
        // return int Accessories Price
        $.get('/Cars/GetAccessoriesPrice/?id=' + id + '&numberOfDays=' + numberOgDays, function (price) {
            returnPrice = price;
            return returnPrice;
        }, 'json');
    }

    function calculate(first, second) {
        var diff = Math.round((second - first) / 1000 / 60 / 60 / 24);
        return diff;
    }

<div class="select-vehicle" style="padding-top:10px">
@(Html.Kendo().MultiSelect().Name("accessoriesCombo").DataValueField("AccessoriesID").DataTextField("AccessoriesName")
      .DataSource(source =>
          {
            source.Read(read =>
              {
                read.Action("Accessories_Read", "Cars");
              });
          })
      .HtmlAttributes(new { @style = "width:100%" })
      .Placeholder("Volitelné příslušenství")
      .AutoClose(false)
      .Events(events =>
        {
          events.Change("onChange");
        })
         )
 <script type="text/x-kendo-tmpl" id="accessoriesTemplate">
  <div style="padding: 5px; vertical-align:middle">
   <p>
      <input type="checkbox" style="vertical-align:text-bottom" id="chb_accessories_#:AccessoriesID#" value="#:AccessoriesID#" /><label for="chb_accessories_#:AccessoriesID#" style="padding-left:5px"> #:AccessoriesName#</label>
 <span style="font-size:12px; padding-left:5px">cena od: #:kendo.toString(data.LowestPrice, "c0", "cs-CZ")# / den</span>
 </p>
 </div>
 </script>
 </div>