[英]MVC 4/5 Add static dropdown to register with validation
在注冊頁面上,我為vdab學生添加了一個下拉列表:是/否但是viewmodel中描述的驗證無效 (我想這是因為我使用ViewBag而不是模型嗎?)
有人可以幫我創建下拉菜單,這樣我可以使用以下方式:
@Html.DropDownFor(x => x.Something, Model.Something, "Select a component type" )
這就是我所擁有的:
身份模型
public class ApplicationUser : IdentityUser
{
public virtual Person Person { get; set; }
}
public class Person
{
public virtual Klas Klas { get; set; }
public int Id { get; set; }
public string Voornaam { get; set; }
public string Familienaam { get; set; }
public bool Vdab { get; set; }
}
public class Klas
{
public int Id { get; set; }
public string Omschrijving { get; set; }
}
public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
public ApplicationDbContext()
: base("ConnectionString")
{
}
}
RegisterViewModel:
public class RegisterViewModel
{
[Required]
[Display(Name = "Gebruikersnaam")]
public string UserName { get; set; }
[Required]
[StringLength(100, ErrorMessage = "Het {0} moet misntens {2} Karakters lang zijn.", MinimumLength = 6)]
[DataType(DataType.Password)]
[Display(Name = "Wachtwoord")]
public string Password { get; set; }
[DataType(DataType.Password)]
[Display(Name = "Bevestig Wachtwoord")]
[Compare("Password", ErrorMessage = "De wachtwoorden komen niet overeen")]
public string ConfirmPassword { get; set; }
[Required]
[Display(Name = "Voornaam")]
public string Voornaam { get; set; }
[Required]
[Display(Name = "Familienaam")]
public string Familienaam { get; set; }
[Required]
[Display(Name = "Klas")]
public string Klas { get; set; }
[Required]
[Display(Name = "Vdab Student")]
public bool Vdab { get; set; }
}
並在AcountController中:
[AllowAnonymous]
public ActionResult Register()
{
var Vdab = new SelectList(new[] { new { ID = "1", Name = "Ja" }, new { ID = "0", Name = "Nee" }, }, "ID", "Name", 1);
ViewBag.Vdab = Vdab;
return View();
}
最后,我用剃刀在視圖中顯示下拉菜單
<div class="form-group">
@Html.LabelFor(m => m.Vdab, new { @class = "col-md-2 control-label" })
<div class="col-md-10">
@Html.DropDownList("Vdab", @ViewBag.Vdab as SelectList, "----Maak een keuze ----")
</div>
</div>
您可以使用:
@Html.DropDownList("Vdab", @ViewBag.Vdab as SelectList, "----Maak een keuze ----")
只要在您的控制器中,您就可以這樣做:
[AllowAnonymous]
public ActionResult Register()
{
List<SelectListItem> myList =new List<SelectListItem>();
myList.Add(new SelectListItem { Value = bool.TrueString, Text = "Ja" });
myList.Add(new SelectListItem { Value = bool.FalseString, Text = "Nee" });
var Vdab = new SelectList(myList,"Value","Text");
ViewBag.Vdab = Vdab;
return View();
}
將此添加到您的RegisterViewModelClass:
public IEnumerable<SelectListItem> VdabSelectList { get; set; }
並在控制器中:
[AllowAnonymous]
public ActionResult Register()
{
RegisterViewModel viewModel = new RegisterViewModel();
viewModel.VdabSelectList = new[]
{
new SelectListItem { Value = bool.TrueString, Text = "Ja" },
new SelectListItem { Value = bool.FalseString, Text = "Nee" }
}
return View(viewModel);
}
[HttpPost]
public ActionResult Register(RegisterViewModel _viewModel)
{
//Do stuff with form data...
}
最后,將此添加到您的視圖:
<div class="form-group">
@Html.LabelFor(m => m.Vdab, new { @class = "col-md-2 control-label" })
<div class="col-md-10">
@Html.DropDownListFor(m => m.vDab, new SelectList(m.VdabSelectList, "Value", "Text"))
</div>
</div>
免責聲明:我還沒有嘗試使用帶有布爾值的DropDownListFor,但是根據這篇文章 ,它似乎應該可以工作。 我總是將單選按鈕用於布爾值,如下所示:
@Html.RadioButtonFor(m => m.Vdab, true)Ja
@Html.RadioButtonFor(m => m.Vdab, false)Nee
您的問題很簡單,您已指定模型類型為bool。 布爾是一種值類型,並且始終會包含一個值,因此無論如何驗證都不會失敗。 它始終至少包含默認值false。
您想使類型為可空。
[Required]
[Display(Name = "Vdab Student")]
public bool? Vdab { get; set; }
現在,您所需的驗證將正常工作,並且原始(且正確)的HTML幫助程序也將工作。
@Html.DropDownFor(x => x.Something, Model.SomethingList, "Select a component type" )
但是,請注意。將您的列表更改為Model.SomethigList,對您的Selected項和列表使用相同的名稱可能會導致很多問題。
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