MVC3远程验证

Question

我目前正在设置使用MVC3进行远程验证的过程，以便在用户选择的用户名已存在的情况下提醒用户。一切从最重要的部分开始正确设置并正确工作，错误信息不被显示。如果我提交表单，则会在页面刷新时显示错误消息，并添加相关的模型状态错误。

有没有办法用Json结果刷新模型验证摘要？

Answer 1

示例代码：

Web.config文件必须包含这样的：

<add key="ClientValidationEnabled" value="true" /> 
    <add key="UnobtrusiveJavaScriptEnabled" value="true" /> 

的看法是这样的：

@model Dommer.Domain.RegisterModel 
@{ 
    ViewBag.Title = "Create"; 
} 

<h2>Create New User</h2> 

@using (Html.BeginForm()) 
{ 
    @Html.ValidationSummary(true, "Account creation was unsuccessful. Please correct the errors and try again.") 
    <div> 
     <fieldset> 
      <legend>Account Information</legend> 

      <div class="editor-label"> 
       @Html.LabelFor(m => m.UserName) 
      </div> 
      <div class="editor-field"> 
       @Html.TextBoxFor(m => m.UserName) 
       @Html.ValidationMessageFor(m => m.UserName) 
      </div> 

      <div class="editor-label"> 
       @Html.LabelFor(m => m.Email) 
      </div> 
      <div class="editor-field"> 
       @Html.TextBoxFor(m => m.Email) 
       @Html.ValidationMessageFor(m => m.Email) 
      </div> 

      <div class="editor-label"> 
       @Html.LabelFor(m => m.Password) 
      </div> 
      <div class="editor-field"> 
       @Html.PasswordFor(m => m.Password) 
       @Html.ValidationMessageFor(m => m.Password) 
      </div> 

      <div class="editor-label"> 
       @Html.LabelFor(m => m.ConfirmPassword) 
      </div> 
      <div class="editor-field"> 
       @Html.PasswordFor(m => m.ConfirmPassword) 
       @Html.ValidationMessageFor(m => m.ConfirmPassword) 
      </div> 
     </fieldset> 
     <input type="submit" value="Create User" /> 
    </div> 
} 

这是该模型被传递到View：

public class RegisterModel 
{ 
    [Required] 
    [RegularExpression(@"(\S)+", ErrorMessage = "Username cannot contain spaces.")] 
    [Remote("CheckUserName", HttpMethod="POST")] 
    [Display(Name = "Username")] 
    public string UserName { get; set; } 

    [Required] 
    [Remote("CheckEmailAddress", ErrorMessage="{0} already has an account, please enter a different email address.", HttpMethod="POST")] 
    [DataAnnotationsExtensions.Email(ErrorMessage="{0} is not a valid email address.")] 
    [Display(Name = "Email address")] 
    public string Email { get; set; } 

    [Required] 
    [ValidatePasswordLength] 
    [DataType(DataType.Password)] 
    [Display(Name = "Password")] 
    public string Password { get; set; } 

    [DataType(DataType.Password)] 
    [Display(Name = "Confirm password")] 
    [Compare("Password", ErrorMessage = "The password and confirmation password do not match.")] 
    public string ConfirmPassword { get; set; } 
} 

这是在控制器

[HttpPost] 
public JsonResult CheckUserName(string userName, Guid? userId = null) 
{ 
    if (userName != null || userName.Length > 2) 
    { 
     var users = Membership.FindUsersByName(userName); 
     if (users.Count == 0) 
     { 
       return Json(true); 
     } 
     else 
     { 
      if ((users[userName].ProviderUserKey as Guid?) == userId) 
      { 
       return Json(true); 
      } 
      else 
      { 
       string suggestedUID = String.Format(CultureInfo.InvariantCulture, "{0} is not available.", userName); 
       for (int i = 1; i < 100; i++) 
       { 
        string altCandidate = userName + i.ToString(); 
        if (Membership.FindUsersByName(altCandidate).Count == 0) 
        { 
         suggestedUID = String.Format(CultureInfo.InvariantCulture, "{0} is not available. Try {1}.", userName, altCandidate); 
         break; 
        } 
       } 
       return Json(suggestedUID); 
      } 
     } 
    } 
    else 
    { 
     return Json(true); 
    } 
} 

这将尝试附加号码的名字，直到找到一个可用的用户名，并会做这样的事情没有做完整的回发：