call jquery alert function or methods in MVC4 controller

Question

i want to call a jquery alert box in the mvc 4 controller but how to i do that?

heres my jquery code in my razor.cshtml

    $( function errMsgBox()
    {
        alert( "Please select the Correct Activity and Task" );
        window.location = "/Memory/Create";
    } );

heres my controller codes

 catch (Exception ex2)
            {
                return View("Create");
            ~~here is i want to call the jquery method~~

}

Answer 1

You cannot use Javascript within the controller. If you want to pass the error message into the page, then you have to use the ViewBag or a return model.

Here's a quick ViewBag example: In the controller

protected ActionResult Index()
{
    ViewBag.ErrorMessage = "";

    //some code
    try
    {
        //more code
    } catch(Exception ex)
    {
        ViewBag.ErrorMessage = "alertError('" + ex.Message + "');";
    }

    return View();
}

In a Razor view:

<script type="text/javascript">
    function alertError(msg) {
        alert(msg);
        //some code
    }
    @ViewBag.ErrorMessage
</script>

Similar to what @NewAmbition suggested, to call it after the page completes loading:

<script type="text/javascript">
    function alertError(msg) {
        alert(msg);
        //some code
    }

    $(function() {
        @ViewBag.ErrorMessage
    });
</script>

Answer 2

In the controller:

catch (Exception ex2)
{
ViewBag.ErrorMsg = "Any string you want";
     return View("Create");
}

Then in View "Create":

@if(ViewBag.ErrorMsg == "Any string you want")
{
<script type="text/javascript">
alert( "Please select the Correct Activity and Task" );
</script>
}

I hope this works for you.

Answer 3

You can try somthing like this, if is ok javascript too.

public ActionResult Index() {
   var script = "alert('Message from Server');";
   return JavaScript(script);
}