选择trainnumber之后如何通过这个选择的trans的控制器countvagon并进入视图下拉列表 [英] How after choosing trainsnumber pass to controller countvagon of this choosed trans and get in view dropdownlist

问题描述

嗨。我是新来的。我知道小角度，asp.net mvc，jquery，json但不能使用它们并在一个项目中合并。所以我有下拉列表 - contry，trans名称，vagon Name.I想要选择trainName，之后在数据库中找到这个选择的Train的Vagon。并显示这个vagon的下拉列表。



据我所知，我需要从View传递给Controller哪个列车选择，然后从数据库查找CountVagon（例如Train-T0000000023有5个vagon）并从Controller传递到View DropdownList（包括-Vagon1，Vagon2，Vagon3，Vagon4，Vagon5）。



请解释一下，如果有人可以解决这个问题。我已经搜索了很多次但是不能做得很好我想要的东西。谢谢你:)）



我尝试过：

Hi.I am new here.I know little angular,asp.net mvc ,jquery,json but cannot use them and combine in one project.So I have dropdown list-contry,trans Name,vagon Name.I want choose trainsName,after that find in database count Vagon of this choosen Train.And show dropdown list this vagon.

As I understand I need to pass from View to Controller which train is choosen,then find from database CountVagon(for example Train-T0000000023 has 5 vagon) And pass from Controller to View DropdownList(which consist-Vagon1,Vagon2,Vagon3,Vagon4,Vagon5).

Please explain me,if somebody can solve that.I have searched many time but couldnt do exatly what I wanted.Thank you :))

What I have tried:

<script type="text/javascript">
    $(document).ready(function () {
        $('#Name').change(function () {
         var TrainID= $('#Name :selected').val();

        });

    });
    
</script>

<h2>Buy</h2>

<div class="table table-bordered">

 
    
    <div class="filter">

        @Html.DropDownListFor(x => x.City, (SelectList)ViewBag.TrainsCity)

        @Html.DropDownListFor(x => x.Name, (SelectList)ViewBag.TrainsName)

        @Html.DropDownListFor(x => x.VagonCount, (List<SelectListItem>)ViewBag.TrainsVagon)

    </div>
       



ANd Controller

  public ActionResult Buy()
        {
            ViewBag.TrainsName = new SelectList(db.Trains, "ID", "Name");
            ViewBag.TrainsCity = new SelectList(db.Trains, "ID", "City");

            //which train or where choosed angular will receive and get the number of train by using lambda expression and pass to the methods
            //I need to pass countVagon instead of 7
            ViewBag.TrainsVagon = PopulateCountVaqon(7);
            PopulateCountVaqon(7);
            IEnumerable<TrainReqistration.Models.Train> trains = db.Trains;
            return View();
        }

        List<SelectListItem>  PopulateCountVaqon(int count)
        {
            List<SelectListItem> countVagon = new List<SelectListItem>();
            for(int i = 0; i <= count; i++)
            {
                countVagon.Add(new SelectListItem() { Value = i.ToString(), Text = "Vaqon " + i });
            }

            return countVagon;
        }

推荐答案

（document）.ready（function（）{

(document).ready(function () {

（'#Name'）。change（function（）{
var TrainID =

('#Name').change(function () { var TrainID=

（'＃Name：selected'）。val（）;

}）;

}）;

< / script>

< h2>购买< / h2>

< div class =table table-bordered>



< div class =filter>

@ Html.DropDownListFor（x => x.City，（SelectList）ViewBag.TrainsCity）

@ Html.DropDownListFor（x => x.Name，（ SelectList）ViewBag.TrainsName）

@ Html.DropDownListFor（x => x.VagonCount，（List< SelectListItem>）ViewBag.TrainsVagon）

< / div>




和控制器

公共ActionResult买（）
{
ViewBag.TrainsName = new SelectList （db.Trains，ID，Name）;
ViewBag.TrainsCity = new SelectList（db.Trains，ID，City）;

//哪个火车或选择角度的地方将通过使用lambda表达式接收并获得火车数量并传递给方法
//我需要通过countVagon而不是7
ViewBag.TrainsVagon = PopulateCountVaqon（7）;
PopulateCountVaqon（7）;
IEnumerable< TrainReqistration.Models.Train> train = db.Trains;
return View（）;
}

列表< SelectListItem> PopulateCountVaqon（int count）
{
List< SelectListItem> countVagon = new List< SelectListItem>（）;
for（int i = 0; i< = count; i ++）
{
countVagon.Add（new SelectListItem（）{Value = i.ToString（），Text =Vaqon + i}）;
}

返回countVagon;
}

('#Name :selected').val(); }); }); </script> <h2>Buy</h2> <div class="table table-bordered"> <div class="filter"> @Html.DropDownListFor(x => x.City, (SelectList)ViewBag.TrainsCity) @Html.DropDownListFor(x => x.Name, (SelectList)ViewBag.TrainsName) @Html.DropDownListFor(x => x.VagonCount, (List<SelectListItem>)ViewBag.TrainsVagon) </div> ANd Controller public ActionResult Buy() { ViewBag.TrainsName = new SelectList(db.Trains, "ID", "Name"); ViewBag.TrainsCity = new SelectList(db.Trains, "ID", "City"); //which train or where choosed angular will receive and get the number of train by using lambda expression and pass to the methods //I need to pass countVagon instead of 7 ViewBag.TrainsVagon = PopulateCountVaqon(7); PopulateCountVaqon(7); IEnumerable<TrainReqistration.Models.Train> trains = db.Trains; return View(); } List<SelectListItem> PopulateCountVaqon(int count) { List<SelectListItem> countVagon = new List<SelectListItem>(); for(int i = 0; i <= count; i++) { countVagon.Add(new SelectListItem() { Value = i.ToString(), Text = "Vaqon " + i }); } return countVagon; }

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