c# - 在部分 View 中创建的下拉列表在呈现时未在 View 中正确验证

Question

我正在使用 MVC 创建一个项目。我有一个 View ，用户将在其中的文本框 和下拉列表 中输入所有数据。

那些文本框和下拉列表在两个单独的局部 View 中创建，我在一个 View 中呈现这些局部 View 。

我的问题是 textbxes 得到正确验证 但下拉列表没有得到验证，即使我选择值。

When I render only one partial view which displays textboxes my control goes to respective Action Method. But when I render partial view for drop down lists; it gives me validation errors even when I select values in drop down lists

我会发布我的代码。

请记住，我只发布了一段代码，因为我的部分 View 包含文本框和下拉列表的重复代码。

抱歉代码太长!!

显示文本框的局部 View 代码

@model PITCRoster.tblUser
<script src="~/Content/CustomScripts/DatePickers.js"></script>
<script src="~/Scripts/jquery.validate.min.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>
    <fieldset>
        <legend>tblUser</legend>

        <div class="editor-label">
            @Html.LabelFor(model => model.FirstName)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.FirstName)
            @Html.ValidationMessageFor(model => model.FirstName)
        </div>
// many other textboxes.
      </fieldset>

显示下拉列表的局部 View 代码

@model PITCRoster.ViewModel.LookUpViewModel
<script src="~/Content/CustomScripts/DatePickers.js"></script>
<script src="~/Scripts/jquery.validate.min.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>

@Html.LabelFor(m => m.SelectedLocation)
@Html.DropDownListFor(m => m.SelectedLocation, Model.LocationList, "-Please select-")
@Html.ValidationMessageFor(m => m.SelectedLocation)
//many other dropdownlists

我在其中呈现这两个局部 View 的 View

@model PITCRoster.ViewModel.WrapperViewModel
@{
    ViewBag.Title = "Resources";
}
<script src="~/Content/PopUp.js"></script>
<script src="~/Scripts/jquery.validate.min.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>
<h2>Resources</h2>
@{
    //Html.RenderPartial("_DisplayResources")
    Html.RenderPartial("_DisplayResources",Model.tblUser);
}


<div id="dialog">
    @using (Html.BeginForm("AddResource", "Resources", FormMethod.Post))
        {
            @Html.AntiForgeryToken()
            @Html.ValidationSummary(true)
            Html.RenderPartial("_CreateNewResource", new PITCRoster.tblUser());
           Html.RenderPartial("_LookUpDropDowns", Model.LookUpViewModel);
            <br />
            <input type="submit" value="Create" />
        }
</div>

这里的WrapperViewModel 是一个ViewModel 类，它包含属性，这些属性 具有呈现那些局部 View 所需的数据。

这是 WrapperViewModel 的代码

public class WrapperViewModel
{
    //tblUser will be a property of class tblUser.
    public IEnumerable<tblUser> tblUser { get; set; }

    //It will contain property of class LookUpViewModel.
    public LookUpViewModel LookUpViewModel { get; set; }
}

所有的文本框都来自类tblUser所有下拉列表都来自类LookUpViewModel

这是我的 LookUpViewModel 类

 public class LookUpViewModel
    {
 [Display(Name = "Location")]
        [Required(ErrorMessage = "Please select a location")]
        public int SelectedLocation { get; set; }
  public SelectList LocationList { get; set; }
}

要理解这门课，请引用我的问题和Stephen Muecke 对那个问题的解决方案 here

这是我在 LocationList 中填充数据的方式

 RosterManagementEntities rosterManagementContext = new RosterManagementEntities();
            // populate your select lists
            var locations = from o in rosterManagementContext.tblCurrentLocations select o;
            model.LocationList = new SelectList(locations, "LocationId", "Location");

这是我的 AddResource 操作方法

  [HttpPost]
        public ActionResult AddResource(LookUpViewModel modelLookUp, tblUser tblUser)
        {
            Helpers.CopyLookUpViewModelTotblUser(modelLookUp, tblUser);
            return View(modelLookUp);
        }

编辑

为 DropDownListFor() 生成的 HTML:

<select name="SelectedLocation" id="SelectedLocation" data-val-required="Please select a location" data-val="true" data-val-number="The field Location must be a number." value="">

它还有<option value = "">

为 ValidationMessageFor() 生成的 HTML:

<span class="field-validation-valid" data-valmsg-replace="true" data-valmsg-for="SelectedLocation" value=""/>

谢谢你..

Answer 1

我已经复制了你的代码，我的工作正常，这就是我所做的

LookUpViewModel.cs

public class LookUpViewModel {
    [Display(Name = "Location")]
    [Required(ErrorMessage = "Please select a location")]
    public int SelectedLocation { get; set; }

    public SelectList LocationList { get; set; }
}

tblCurrentLocations.cs

public class tblCurrentLocations {
    public int LocationId { get; set; }
    public string Location {get;set;}
}

tblUser.cs

public class tblUser {
    [Display(Name = "First Name")]
    [Required(ErrorMessage = "First Name required")]
    public string FirstName {get; set;}
}

我使用了 Index我的方法 HomeControler呈现初始 View

public ActionResult Index() {
        var locations = new List<tblCurrentLocations>();
        locations.Add(new tblCurrentLocations {LocationId = 1, Location = "A"});
        locations.Add(new tblCurrentLocations {LocationId = 2, Location = "B"});

        var model = new WrapperViewModel();
        model.LookUpViewModel = new LookUpViewModel() {
            LocationList = new SelectList(locations, "LocationId", "Location")
        };
        return View(model);
    }

_CreateNewResource.cshtml

@model WebApplication1.Models.tblUser

<fieldset>
<legend>tblUser</legend>

<div class="editor-label">
    @Html.LabelFor(model => model.FirstName)
</div>
<div class="editor-field">
    @Html.EditorFor(model => model.FirstName)
    @Html.ValidationMessageFor(model => model.FirstName)
</div>
// many other textboxes.

_LookUpDropDowns.cshtml

model WebApplication1.Models.LookUpViewModel

@Html.LabelFor(m => m.SelectedLocation)

@Html.DropDownListFor(m => m.SelectedLocation, Model.LocationList, "-Please select-")

@Html.ValidationMessageFor(m => m.SelectedLocation)

最后是呈现所有 Partials 的 View

@model WebApplication1.Models.WrapperViewModel
@{
    ViewBag.Title = "Resources";
}
<script src="~/Scripts/jquery-2.1.4.min.js"></script>
<script src="~/Scripts/jquery.validate.min.js"></script>
<script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>
<h2>Resources</h2>

<div id="dialog">
@using (Html.BeginForm("AddResource", "Home", FormMethod.Post)) {
    @Html.AntiForgeryToken()
    @Html.ValidationSummary(true)
    Html.RenderPartial("_CreateNewResource", new WebApplication1.Models.tblUser());
    Html.RenderPartial("_LookUpDropDowns", Model.LookUpViewModel);
    <br />
    <input type="submit" value="Create" />
}

关于 validation 这对我来说效果很好并发布选定的结果，您提到 View 中的内容比您发布的内容多，也许 View 中的其他内容造成了麻烦。另请注意，我必须添加 <script src="~/Scripts/jquery-2.1.4.min.js"></script>让验证工作，你已经 ommited