Question

最后让我的级联下拉列表工作，但发现它不是在编辑模式下重新填充。第一个下拉列表填充，我已将jquery设置为在下拉列表更改或文档就绪时运行。我在jquery中设置了一个警报，但它没有进入控制器中的函数来下拉第二个下拉列表的相应列表。谁知道我可能会出错？

以下是代码 - 基本上我正在做的是选择一家航空公司，然后从那里选择与该航空公司相关的航班列表：视图：

<div class="editor-field">
    @Html.DropDownListFor(x => x.FlightTime.AirlineID, Model.Airlines, "Select Airline")
    @Html.ValidationMessageFor(model => model.AirlineID)
</div>
<div class="editor-label">
    @Html.LabelFor(model => model.FlightID, "Flight")
</div>
<div class="editor-field">
    @Html.DropDownListFor(x => x.FlightTime.FlightID, Model.Flights, "Select Flight")
    <a href="#" class="flight">Add new</a>
    @Html.ValidationMessageFor(model => model.FlightTime.FlightID)
</div>
etc...

jQuery in View

$(document).ready(function () {
    var id = $('select#FlightTime_AirlineID').val();
    populate(id);

    $("#FlightTime_AirlineID").change(function () {
        var id = $('select#FlightTime_AirlineID').val();
        populate(id);
    });

    function populate(id) {
        alert('hello');
        //The line below is where it stops
        $.get('../FlightTime/GetFlightList/' + id, function (response) {
            var flights = $.parseJSON(response);
            var ddlSelectedFlight = $("#FlightTime_FlightID");

            // clear all previous options
            $("#FlightTime_FlightID > option").remove();

            // populate the products     
            for (i = 0; i < flights.length; i++) {
                ddlSelectedFlight.append($("<option />").val(flights[i].Value).text(flights[i].Text));
            }
            if (flights.length == 0) {
                ddlSelectedFlight.append($("<option />").val('').text('No flights added'));
            }
        });
    }
});

它应该进入的控制器功能：

public string GetFlightList(string id)
{
    var flightList = this.GetFlights(Convert.ToInt32(id));
    var myData = flightList.Select(a => new SelectListItem()
    {
        Text = a.FlightNumber,
        Value = a.FlightID.ToString()
    });
    string text = new JavaScriptSerializer().Serialize(myData);
    return text;
}

视图模型

public class FlightTimeViewModel
{
        private List<SelectListItem> _airlines = new List<SelectListItem>();
        private List<SelectListItem> _flights = new List<SelectListItem>();

        [DisplayName("Airline")] //Selected Value
        [Required(ErrorMessage = "Please select an airline")]
        public string AirlineID { get; set; }

        [DisplayName("Flight")] //Selected Value
        [Required(ErrorMessage = "Please select a flight")]
        public string FlightID { get; set; }

        public List<SelectListItem> Flights
        {
            get { return _flights; }
        }
        public List<SelectListItem> Airlines
    {
            get
            {
                foreach (Airline a in TimeTable.Repository.AirlineRepository.GetAirlineList())
                {
                    _airlines.Add(new SelectListItem() { Text = a.AirlineName.ToString(), Value = a.AirlineID.ToString() });
                }
                return _airlines;
            }
    }
        public FlightTime FlightTime { get; set; }
}

该功能在创建模式下正常工作，但在处于编辑模式时的警报之后停止在jQuery行中。一直在与Viewmodels /下拉列表进行斗争，但我想在此之前已经弄明白了。

由于

Answer 1

请你试试：

$("#FlightTime_AirlineID").change(function () {
        var id = $('select#FlightTime_AirlineID').val();
        populate(id);
    }).change();

在编辑模式下重新填充级联下拉列表 - MVC

1 个答案: