How to show alert message in mvc 4 controller

Question

I tried show a alert box in mvc controller by if-else condition But alert box does not display Where is my mistake    Controller  public ActionResult Index         int userId   Convert ToInt32 Session  userId   ToString          if  WebMatrix WebData WebSecurity IsAuthenticated                if  userId    90043                         return View                      else                       TempData  Message      You are not authorized                return RedirectToAction  Index    Home                        else               return RedirectToAction  Index    Home

User · Answer

It is not possible to display alerts from the controller  Because MVC views and controllers are entirely separated from each other  You can only display information in the view only  So it is required to pass the information to be displayed from controller to view by using either ViewBag  ViewData or TempData  If you are trying to display the content stored in TempData  Message    It is possible to perform in the view page by adding few javascript lines    lt script gt    alert  TempData  Message      lt  script gt

User · Answer

I know this is not typical alert box  but I hope it may help someone   There is this expansion that enables you to show notifications inside HTML page using bootstrap   It is very easy to implement and it works fine  Here is a github page for the project including some demo images

User · Answer

lt a href   Url Action  DeleteBlog    class  btn btn-sm btn-danger  onclick  return confirm   Are you sure want to delete blog      gt

User · Answer

TempData  msg       lt script gt alert  Change succesfully    lt  script gt     Html Raw TempData  msg

User · Answer

You cannot show an alert from a controller  There is one way communication from the client to the server The server can therefore not tell the client to do anything  The client requests and the server gives a response   You therefore need to use javascript when the response returns to show a messagebox of some sort    OR  using jquery on the button that calls the controller action   lt script gt     document  ready function          submitButton   on  click  function          alert  Your Message                lt script gt

User · Answer

Use this   return JavaScript alert  Hello this is an alert       or   return Content   lt script language  javascript  type  text javascript  gt alert  Thanks for Feedback     lt  script gt

User · Answer

Response Write    lt script language  javascript  gt alert  Message    n     Hi            lt  script gt

[c#] How to show alert message in mvc 4 controller?

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