MVC5视图模型验证远程 [英] MVC5 ViewModel Validation Remote

问题描述

我想在同一个舞台来验证用户名作为验证视图模型，验证的其余部分工作正常，但是我想要使用下面的代码片段来检查用户名已在使用或不：

I'm trying to validate a username during the same stage as validating the view model, the rest of the validation works fine however I'm trying to use the following snippet to check if a username is already in use or not:

// Cut down code to keep it simple.
public class UserAccountRegistration
{
    [Remote("CheckUsername", "Validation", ErrorMessage = "Username already exists.")]
    public string Username { get; set; }
}

我有一个名为ValidationController.cs的控制器目录中的控制器，该控制器包含以下内容：

I have a controller named "ValidationController.cs" within the Controllers directory, that controller contains the following:

using System;
using System.Web.Mvc;
using Test.Helpers;
using System.Data.SqlClient;
using System.Data;

namespace Test.Controllers
{
    public class ValidationController : Controller
    {
    // GET: Validation
    public ActionResult Index()
    {
        return View();
    }

    [HttpGet]
    public JsonResult CheckUsername(string Username)
    {
        Encryption hlpEncryption = new Encryption();
        DataConnections hlpDBConn = new DataConnections();

        bool bUsernameAlreadyExists = false;
        string sEncUsername = hlpEncryption.Encrypt(p_sUsername);

        SqlConnection conn = hlpDBConn.DBConnection();

        using (SqlCommand cmd = new SqlCommand("CheckIfUsernameExists", conn) { CommandType = CommandType.StoredProcedure })
        {
            cmd.Parameters.AddWithValue("@Username", sEncUsername);

            conn.Open();
            bUsernameAlreadyExists = (Convert.ToInt16(cmd.ExecuteScalar()) > 0);
            conn.Close();
        }

        return Json(bUsernameAlreadyExists, JsonRequestBehavior.AllowGet);
    }
}

}

然而，它的 CheckUsername 方法甚至没有被打到，我究竟做错了什么？

However it the CheckUsername method doesn't even get hit, what am I doing wrong?

感谢您。

推荐答案

让我们仔细检查两件事情：

Let's double check a couple of things:

您已经正确地引用在布局以下库（preferably），并按此顺序：

You have correctly referenced the following libraries in the layout (preferably) and in this order:

    <script src="~/Scripts/jquery-2.2.3.min.js"></script>    
    <script src="~/Scripts/jquery.validate.min.js"></script>
    <script src="~/Scripts/jquery.validate.unobtrusive.min.js"></script>

在您的Web配置文件有：

On your web config file you have:

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

在您的看法是这样的：

  @Html.LabelFor(m => m.Username)
  @Html.TextBoxFor(m => m.Username)
  @Html.ValidationMessageFor(m => m.Username)

更重要的是删除验证不火，直到你点击提交的第一次。您需要包括内部的和LT的previous文本; FORM>一个提交按钮能够验证用户名。这不是自动正则表达式，必需或StringLength。我觉得这个作品的方式，以避免请求的服务器，直到用户是肯定这是他想要的用户名。

More important the Remove validation doesn't fire until you click submit the first time. You need to include the previous text inside a < form> with a submit button to be able to validate the Username. It's not automatically as Regex, Required or StringLength. I think this works that way to avoid request the server until the user is sure that's the Username he wants.

这篇关于MVC5视图模型验证远程的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！