c# - RequiredIf 没有触发客户端验证

Question

我正在使用 JaroslawWaliszko 的 ExpressiveAnnotations .当我通过 ModelState.IsValid 检查服务器端时，它工作正常。但它没有显示客户端验证消息。我不知道缺少什么东西。我也添加了 jquery 文件。这是我应用 RequiredIf 的属性:

// When Role = Assistant Professor(which has id = 3), 
// His/ Her head's Id should be selected as ParentID.

[RequiredIf("RoleID == 3", ErrorMessage = "Select Head.")] 
public Nullable<int> ParentID { get; set; }

呈现的 HTML 如下:

<select class="form-control ng-pristine ng-valid" 
        data-val="true" 
        data-val-number="The field ParentID must be a number." 
        data-val-requiredif="Select Head." 
        data-val-requiredif-allowempty="false" 
        data-val-requiredif-constsmap="{}" 
        data-val-requiredif-expression="RoleID == 3" 
        data-val-requiredif-fieldsmap="{"RoleID":"numeric"}" 
        id="ParentID" 
        name="ParentID" 
        ng-model="DTO.ParentID" 
        ng-options="obj.Value as obj.Text for obj in headList">

    <option selected="selected" value="" class="">--select--</option>
    <option value="0">Mr. Kevin Thomas</option>
    <option value="1">Ms. Lisa Brown</option>
    <option value="2">Mr. Sail Kapoor</option>
</select>

我已经实现的事情:

1. 已安装的包:Install-Package ExpressiveAnnotations，

2. 在 Global.asax 中添加了以下代码

   DataAnnotationsModelValidatorProvider.RegisterAdapter(
       typeof (RequiredIfAttribute), typeof (RequiredIfValidator));
   DataAnnotationsModelValidatorProvider.RegisterAdapter(
       typeof (AssertThatAttribute), typeof (AssertThatValidator));
   

3. 在 jquery 验证文件下方的 bundle 中添加了 expressive.annotations.validate.js，并在指定页面上添加了 bundle 。

Answer 1

我觉得还不错。控制台输出是否有任何错误？

你可以试试这个对我有用:

public class Model
{
    public IEnumerable<SelectListItem> Supervisors
    {
        get
        {
            return new[]
            {
                new SelectListItem {Text = "Mr. Kevin Thomas", Value = "0"},
                new SelectListItem {Text = "Ms. Lisa Brown", Value = "1"},
                new SelectListItem {Text = "Mr. Sail Kapoor", Value = "2"}
            };
        }
    }

    [RequiredIf("RoleID == 3", ErrorMessage = "Select Head.")]
    public int? ParentID { get; set; }
    ...

和 View :

@Html.DropDownListFor(model => model.ParentID, Model.Supervisors, "--select--")
@Html.ValidationMessageFor(model => model.ParentID)

此外，除非您已经看过它，否则请查看 sample project在那里你可以找到一些类似的案例。

更新:

Look here for few troubleshooting steps .