我的级联下拉列表 (DDL) 有问题，当您选择第一个 DDL 时它可以正常工作，当您选择第二个 DDL 时，第三个 DLL 不会触发并且值为 null。
这是我的 JS
$('#Building_SelectedBuildingID').change(function () {
var SelectedBuildingID = $(this).val();
$.getJSON('@Url.Action("ActionFloor")', { buildingId: SelectedBuildingID }, function (oFloors) {
var SelectFloorID = $('#Floor_SelectedItem');
SelectFloorID.empty();
$.each(oFloors, function (index, Floor) {
SelectFloorID.append(
$('<option/>')
.attr('value', Floor.Code)
.text(Floor.Description)
);
});
});
});
$('#Floor_SelectedFloorID').change(function () {
var SelectedBuildingID = $('#Building_SelectedBuildingID').val();
var selectedFloorId = $(this).val();
$.getJSON('@Url.Action("ActionLocation")', { buildingId: SelectedBuildingID,floorId: selectedFloorId }, function (oLocations) {
var SelectLocationID = $('#Location_SelectedItem');
SelectLocationID.empty();
$.each(oLocations, function (index, Location) {
SelectLocationID.append(
$('<option/>')
.attr('value', Location.Code)
.text(Location.Description)
);
});
});
});
});
看法
@model FA_CS.Models.Operation.NewRegistration
<table style="width:100%;">
<tr>
<td colspan="2">
<strong>Location</strong></td>
</tr>
<tr>
<td class="style1">
@Html.LabelFor(m => m.Building)</td>
<td>
@Html.DropDownListFor(x => x.Building.SelectedBuildingID, new SelectList(Model.Building.BuildingItems, "code", "description"))
</td>
</tr>
<tr>
<td class="style1">
@Html.LabelFor(m => m.Floor) </td>
<td>
@Html.DropDownListFor(x => x.Floor.SelectedItem, Enumerable.Empty<SelectListItem>())
</td>
</tr>
<tr>
<td class="style1">
@Html.LabelFor(m => m.Location)</td>
<td>
@Html.DropDownListFor(x => x.Location.SelectedItem, Enumerable.Empty<SelectListItem>())
</td>
</tr>
</table>
模型
Imports System
Imports System.Collections.Generic
Imports System.ComponentModel
Imports System.ComponentModel.DataAnnotations
Imports System.Globalization
Public Class ItemClass
Private _code As String
Private _description As String
Private _ClassItems As System.Collections.Generic.List(Of ItemClass)
Private _Type As MDL.Type
Private _Types As System.Collections.Generic.List(Of MDL.Type)
Private _SelectedClassItem As String
Private _SelectedTypeItem As String
Private _SelectedSubTypeItem As String
Public Property SelectedClassID As String
Get
Return _SelectedClassItem
End Get
Set(value As String)
_SelectedClassItem = value
End Set
End Property
Public Property SelectedTypeID As String
Get
Return _SelectedTypeItem
End Get
Set(value As String)
_SelectedTypeItem = value
End Set
End Property
Public Property SelectedSubTypeID As String
Get
Return _SelectedSubTypeItem
End Get
Set(value As String)
_SelectedSubTypeItem = value
End Set
End Property
<DataType(DataType.Text)> _
<Display(Name:="Type")> _
Public Property code() As String
Get
Return _code
End Get
Set(ByVal Value As String)
_code = Value
End Set
End Property
<DataType(DataType.Text)> _
<Display(Name:="Type")> _
Public Property description() As String
Get
Return _description
End Get
Set(ByVal Value As String)
_description = Value
End Set
End Property
Public Property ClassItems() As System.Collections.Generic.List(Of ItemClass)
Get
Return _ClassItems
End Get
Set(ByVal value As System.Collections.Generic.List(Of MDL.ItemClass))
_ClassItems = value
End Set
End Property
''' <summary>
''' Property for collection of Type
''' </summary>
''' <pdGenerated>Default opposite class collection property</pdGenerated>
Public Property Type() As MDL.Type
Get
Return _Type
End Get
Set(ByVal value As MDL.Type)
_Type = value
End Set
End Property
Public Property Types() As System.Collections.Generic.List(Of Type)
Get
Return _Types
End Get
Set(ByVal value As System.Collections.Generic.List(Of Type))
_Types = value
End Set
End Property
Public Overrides Function ToString() As String
Return Me._description
End Function
End Class
控制器
public JsonResult GetCascadeBuildings()
{
return Json(FA_CS.Helpers.BuildingList.Status, JsonRequestBehavior.AllowGet);
}
public JsonResult GetCascadeFloors(string buildingCode)
{
var gathererS = new List<MDL.Floor>();
gathererS = GetFloors(buildingCode);
return Json(gathererS, JsonRequestBehavior.AllowGet);
}
public List<MDL.Floor> GetFloors(string BuildingCode)
{
FAWebService.Service1 faws = new FAWebService.Service1();
Array arr = faws.GatherFloor(BuildingCode);
MDL.Floor oFloor = new MDL.Floor();
List<MDL.Floor> oFloors = new List<MDL.Floor>();
foreach (FAWebService.Floor itm in arr)
{
oFloors.Add(new MDL.Floor { SelectedItem = itm.Code, Description = itm.Description });
}
return oFloors;
}
public JsonResult GetCascadeLocations(string buildingCode, string floorCode)
{
var gatherer = new MDL.Location();
var gathererS = new List<MDL.Location>();
gathererS = GetLocations(buildingCode, floorCode);
return Json(gathererS, JsonRequestBehavior.AllowGet);
}
public List<MDL.Location> GetLocations(string BuildingCode, string floorCode)
{
FAWebService.Service1 faws = new FAWebService.Service1();
Array arr = faws.GatherLocation(BuildingCode, floorCode);
MDL.Location oLocation = new MDL.Location();
List<MDL.Location> oLocations = new List<MDL.Location>();
foreach (FAWebService.Location itm in arr)
{
oLocations.Add(new MDL.Location { Code = itm.Code, Description = itm.Description });
}
return oLocations;
}