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我對MVC很新，需要關於級聯下拉列表的幫助。目的是記錄場地內有故障設備的故障。我有兩張桌子：「場地」和「場地設備」。第一個下拉列表應該是一個場地列表，從列表中選擇一個場地後，它應該填充場地中各種設備類型的另一個下拉列表。我假設用戶只能使用一種設備記錄故障。如何創建級聯下拉列表？
在我的 「FaultsController」 的代碼是：
// GET: Faults/Create
public ActionResult Create()
{
ViewBag.UserID = new SelectList(db.UserTables, "UserID", "UserEMailAddress");
ViewBag.VenueNum = new SelectList(db.VenueEquipmentTables, "VenueEquipmentID", "VenueNum");
ViewBag.VenueEquipmentID = new SelectList(db.VenueEquipmentTables, "VenueEquipmentID", "VenueEquipmentType");
return View();
}
在我看來的代碼是：
<div class="form-group">
@Html.LabelFor(model => model.VenueEquipmentID, "Venue Number", htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("VenueNum", null, htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.VenueEquipmentID, "", new { @class = "text-danger" })
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.VenueEquipmentID, "Venue Equipment Type", htmlAttributes: new { @class = "control-label col-md-2" })
<div class="col-md-10">
@Html.DropDownList("VenueEquipmentID", null, htmlAttributes: new { @class = "form-control" })
@Html.ValidationMessageFor(model => model.VenueEquipmentID, "", new { @class = "text-danger" })
</div>
</div>
我的模型 - 「FaultTable」 如下：
public partial class FaultTable
{
public int UserID { get; set; }
public int VenueEquipmentID { get; set; }
public virtual UserTable UserTable { get; set; }
public virtual VenueEquipmentTable VenueEquipmentTable { get; set; }
}