mvc 實現超時彈窗後跳轉

為了實現保持登錄狀態,可以用cookie來解決這一問題

假設過期時間為30分鐘,校驗發生在伺服器,藉助過濾器,可以這樣寫

    public class PowerFilter : AuthorizeAttribute
    {
        public override void OnAuthorization(AuthorizationContext filterContext)
        {
            var cookie = HttpContext.Current.Request.Cookies["loginInfo"];
            if(null == cookie)
            {
                filterContext.Result = new RedirectResult("/admin/login/index");
            }
            else
            {
                cookie.Expires = DateTime.Now.AddMinutes(30);
                HttpContext.Current.Response.Cookies.Remove("loginInfo");
                HttpContext.Current.Response.Cookies.Add(cookie);
            }
        }
    }

但是頁面直接跳轉了,也沒有一個提示,顯得不是很友好,可以這樣

    public class PowerFilter : AuthorizeAttribute
    {
        public override void OnAuthorization(AuthorizationContext filterContext)
        {
            var cookie = HttpContext.Current.Request.Cookies["loginInfo"];
            if(null == cookie)
            {
                filterContext.Result = new ContentResult()
                {
                    Content = string
                    .Format("<script>alert('登錄超時,請重新登錄');location.href='{0}'</script>","/admin/login/index")
                };
            }
            else
            {
                cookie.Expires = DateTime.Now.AddMinutes(30);
                HttpContext.Current.Response.Cookies.Remove("loginInfo");
                HttpContext.Current.Response.Cookies.Add(cookie);
            }
        }
    }
}

但是,假如是ajax請求呢?

    public class PowerFilter : AuthorizeAttribute
    {
        public override void OnAuthorization(AuthorizationContext filterContext)
        {
            var cookie = HttpContext.Current.Request.Cookies["loginInfo"];
            if(null == cookie)
            {
                if(!filterContext.HttpContext.Request.IsAjaxRequest())
                {
                    filterContext.Result = new ContentResult()
                    {
                        Content = string
                                 .Format("<script>alert('登錄超時,請重新登錄');location.href='{0}'</script>","/admin/login/index")
                    };
                }
                else
                {
                    filterContext.Result = new JsonResult()
                    {
                        Data = new { logoff = true,logurl = "/admin/login/index" },
                        ContentType = null,
                        ContentEncoding = null,
                        JsonRequestBehavior = JsonRequestBehavior.AllowGet
                    };
                }
            }
            else
            {
                cookie.Expires = DateTime.Now.AddMinutes(30);
                HttpContext.Current.Response.Cookies.Remove("loginInfo");
                HttpContext.Current.Response.Cookies.Add(cookie);
            }
        }
    }