如何检查用户是否已经在ASP.NET MVC 5客户端的存在？ [英] How to check if user already exists on client-side in ASP.NET MVC 5?

问题描述

使用的 Visual Studio的2013.4 （适用的Visual Studio 2013更新4）我创建了一个普通的 ASP.NET MVC 5 项目，单个用户帐户身份验证配置。所有的用户注册和登录功能已经由Visual Studio中已经脚手架为我和正常工作。

Using Visual Studio 2013.4 (Visual Studio 2013 Update 4) I have created a regular ASP.NET MVC 5 project with Individual User Accounts authentication configuration. All the users registration and log-in features has been already scaffolded for me by Visual Studio and works fine.

如何实现注册页面上的以下规则的客户端验证：有没有已经注册使用相同的电子邮件用户

How to implement client-side validation of the following rule on the registration page: There is no already registered user with the same Email?

推荐答案

您可以使用<一个href=\"https://msdn.microsoft.com/en-us/library/system.web.mvc.remoteattribute(v=vs.118).aspx\">RemoteAttribute与服务器回调执行客户端验证。

You could use RemoteAttribute to perform client side validation with a server callback.

1）添加以下方法到的AccountController ：

1) Add the following method to the AccountController:

[AllowAnonymous]
public async Task<JsonResult> UserAlreadyExistsAsync(string email)
{
    var result = 
        await userManager.FindByNameAsync(email) ?? 
        await userManager.FindByEmailAsync(email);
    return Json(result == null, JsonRequestBehavior.AllowGet);
}

2）添加远程属性电子邮件的属性 RegisterViewModel 类：

[Remote("UserAlreadyExistsAsync", "Account", ErrorMessage = "User with this Email already exists")]
public string Email { get; set; }

其中，帐户是服务控制器的名称，UserAlreadyExistsAsync是它的动作名称。

where "Account" is the name of the serving controller and "UserAlreadyExistsAsync" is it's action name.

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