如何在asp.net MVC中的控制器中使用JavaScript

Question

I have a login page and want to show an alert when the user login was successful. but when I use JavaScript it doesn't work. in fact everything works just this javaScript doesn't work.

    [HttpGet]
    public ActionResult LogIn()
    {
        return View();
    }

    [HttpPost]
    public ActionResult LogIn(tblUser user)
    {
        if (ModelState.IsValid)
        {
            var logData = UserBLL.LogInCheck(user);
            if (logData != null)
            {
                JavaScript("alert(Wellcome Dear Admin)");
                Session["user"] = "Admin";
                return RedirectToAction("Index", "Home");
            }
        }

        return View();
    }

I don't know what to do!!!

Answer 1

You can redirect the user by the javascript. So only return the Javascriptresult.

see the code below :-

        [HttpPost]
        public ActionResult LogIn(tblUser user)
        {
            if (ModelState.IsValid)
            {
                var logData = UserBLL.LogInCheck(user);
                if (logData != null)
                {
                    Session["user"] = "Admin";
                    return JavaScript("alert(Wellcome Dear Admin); window.location.href = '" + Url.Action("Index", "Home") + "';");
                }
            }

            return View();
        }

Answer 2

Try this:

[HttpPost]
        public ActionResult LogIn(tblUser user)
        {
            if (ModelState.IsValid)
            {
                var logData = UserBLL.LogInCheck(user);
                if (logData != null)
                {
                    Session["user"] = "Admin";
                    TempData["LoginSuccess"] = "1";
                }
            }

            return View();
        }

In cshtml:

@if (TempData["LoginSuccess"] != null)
{
    <script type="text/javascript">
        alert("Welcome Dear Admin!");
        window.location.href = '@Url.Action("Index", "Home")';
    </script>
}