Hi Michaël Vanbrabandt, I have the same problem. And it is kinda weird.

So I have Surface Controller for log in log out the registration and forgot password requests. When I using Ajax.BeginForm without RenderRouteHandler in arguments it will give me an error. But when I typed there some random classes there like

"new { email = new EmailSender()}"

it will act okay, but after the request, it will send me to the blank page wich have the url of request and RenderRouteHandler value.

Also when i do the same request with RenderRouteHandler arguments while member logged in, it acts like normal ajax request.

Code of Controler:

enter using System.Web.Mvc;
using System.Web.Security;
using Umbraco.Web.Mvc;
using REDAirCalculator.Models.DTO;
using MailKit.Net.Smtp;
using MimeKit;
using REDAirCalculator.Models;
using System.IO;
using REDAirCalculator.DAL;

namespace REDAirCalculator.Controllers
{
     public class MembersController : SurfaceController
     {
          private readonly IProjectRepository _projectRepository;

    public MembersController(IProjectRepository projectRepository)
    {
        _projectRepository = projectRepository;
    }

    [HttpPost]
    public void PasswordRecovery(Email userEmail)
    {
        MimeMessage message = new MimeMessage();

        MailboxAddress from = new MailboxAddress("User",
        "emailaddress@mail.com");
        message.From.Add(from);

        MailboxAddress to = new MailboxAddress("User",
        userEmail.EmailAddress);
        message.To.Add(to);

        message.Subject = "Password recovery";

        BodyBuilder bodyBuilder = new BodyBuilder();

        string msg = Request.Url.ToString().Replace("PasswordRecovery?emailUser=Umbraco.Core.EmailSender",
            "ForgetPassword?memberGuId=" + Umbraco.MembershipHelper.GetByEmail(userEmail.EmailAddress).Id.ToString());

        bodyBuilder.TextBody = msg;

        message.Body = bodyBuilder.ToMessageBody();

        SmtpClient client = new SmtpClient();
        client.Connect("smtp.gmail.com", 465, true);
        client.Authenticate("emailaddress", "password");

        client.Send(message);
        client.Disconnect(true);
        client.Dispose();
    }
}

View code:

@inherits Umbraco.Web.Mvc.UmbracoViewPage<REDAirCalculator.Models.DTO.Email>
@using Umbraco.Web
@{
      string popupCancelText = Umbraco.GetDictionaryValue("Popup cancel text");

string emailPopupTitleText = Umbraco.GetDictionaryValue("Email popup title text");
string emailPopupAddressText = Umbraco.GetDictionaryValue("Email popup address text");
string emailPopupOkText = Umbraco.GetDictionaryValue("Email popup ok text");

var currentEntryObjectGuid = TempData["Forms_Current_Record_id"];
}



<script src="~/node_modules/jquery-ajax-unobtrusive/dist/jquery.unobtrusive-ajax.min.js"></script>



@using (Ajax.BeginForm("PasswordRecovery", "Members", new AjaxOptions { OnSuccess = "onSuccess", OnFailure = "onFail", OnBegin = "onBegin" }, new { @class = "project-form" }))
{

<button type="button" class="project-close-btn close btn btn-lg disabled" data-dismiss="modal" aria-label="Close">
    ✕
</button>

<h3 class="modal-title project-title" id="emailProjectTitle">@emailPopupTitleText</h3>

<div class="form-group project-input-container">
    <label for="EmailAddress" class="bmd-label-floating">@emailPopupAddressText</label>
    <input required class="form-control" id="EmailAddress" name="EmailAddress" data-val="true" data-val-required="The Email field is required."
           data-val-regex="Please enter a valid e-mail address" type="email" value=""
           data-val-regex-pattern="[A-Za-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[A-Za-z0-9!#$%&'*+/=?^_`{|}~-]+)*@@(?:[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?\.)+[A-Za-z0-9](?:[A-Za-z0-9-]*[A-Za-z0-9])?">
    <span class="field-validation-valid bmd-help" data-valmsg-for="EmailAddress" data-valmsg-replace="true"></span>
</div>

<div class="project-btn-container">
    <input name="mail" type="submit" class="btn btn-primary project-submit-btn project-email-btn" value="Recover" />
</div>
}

Did you enable client validation?

Did you import required libraries?

@{
    Html.EnableClientValidation();
    Html.EnableUnobtrusiveJavaScript();
}

JS libraries:

<script src="https://code.jquery.com/jquery-3.1.1.min.js"
        integrity="sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8="
        crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.19.1/jquery.validate.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validation-unobtrusive/3.2.11/jquery.validate.unobtrusive.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/jquery-ajax-unobtrusive@3.2.6/dist/jquery.unobtrusive-ajax.min.js"
        integrity="sha256-PAC000yuHt78nszJ2RO0OiDMu/uLzPLRlYTk8J3AO10="
        crossorigin="anonymous"></script>