[英]MVC 4/5 Add static dropdown to register with validation
在注册页面上,我为vdab学生添加了一个下拉列表:是/否但是viewmodel中描述的验证无效 (我想这是因为我使用ViewBag而不是模型吗?)
有人可以帮我创建下拉菜单,这样我可以使用以下方式:
@Html.DropDownFor(x => x.Something, Model.Something, "Select a component type" )
这就是我所拥有的:
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; }
}
并在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,我用剃刀在视图中显示下拉菜单
<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,您就可以这样做:
[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();
}
将此添加到您的RegisterViewModelClass:
public IEnumerable<SelectListItem> VdabSelectList { get; set; }
并在控制器中:
[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,将此添加到您的视图:
<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>
免责声明:我还没有尝试使用带有布尔值的DropDownListFor,但是根据这篇文章 ,它似乎应该可以工作。 我总是将单选按钮用于布尔值,如下所示:
@Html.RadioButtonFor(m => m.Vdab, true)Ja
@Html.RadioButtonFor(m => m.Vdab, false)Nee
您的问题很简单,您已指定模型类型为bool。 布尔是一种值类型,并且始终会包含一个值,因此无论如何验证都不会失败。 它始终至少包含默认值false。
您想使类型为可空。
[Required]
[Display(Name = "Vdab Student")]
public bool? Vdab { get; set; }
现在,您所需的验证将正常工作,并且原始(且正确)的HTML帮助程序也将工作。
@Html.DropDownFor(x => x.Something, Model.SomethingList, "Select a component type" )
但是,请注意。将您的列表更改为Model.SomethigList,对您的Selected项和列表使用相同的名称可能会导致很多问题。
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