Question

I have a page which open a new window with External Url (Twitter Authentication Url) now that window will authenticate the user and call back to an action method , in that action method i have to close the current window (popUp) and inform the opener that authentication succeeded,

in web forms i used to do something like this on a (postback):

            (HttpContext.Current.Handler as System.Web.UI.Page).ClientScript.RegisterStartupScript(
            this.GetType(),
            "winPop",
            "window.opener.doSomething(true);window.close()",
            true);

in MVC i tried this but didnt work since there is no Current but there is :

HttpContext.CurrentHandler

which can be casted to Mvc.MvcHandler now the question arise i know MVC is totally Different but is there is any way to register script which would run at the response startup ?

I know i can make an extra view and open it in the new window and then redirect to Twitter Url and then on the call back to the same Window i would call the script simply window.opener……etc but that would mean i have to make an extra view that only have nothing but a line of javascript at the startup, so i was wondering if i can do one of the following :

Option 1: Register Start up Script like i explained above.
Option 2: Return javascript code that runs at the client (no actual view).

Answer 1

You can simply forget what you were doing classic WebForms as it won’t be of much of a help in ASP.NET MVC.

In ASP.NET MVC you have Models, Controllers and Views (as its name suggests). So if you wanted to call a javascript function in your view and pass it some value from your model you could do the following:

@model MyViewModel
<script type="text/javascript">
    alert(@Html.Raw(Json.Encode(Model.SomeValue)));
</script>

where obviously your controller action will populate this model and pass it to the view:

public ActionResult Foo()
{
    var model = new MyViewModel
    {
        SomeValue = "Hello world"
    };
    return View(model);
}

and of course a corresponding model:

public class MyViewModel
{
    public string SomeValue { get; set; }
}

See? Model, View, Controller.

---

UPDATE:

in that action method i have to close the current window (popUp) and
inform the opener that authentication succeeded,

You don’t need a model in this simple case:

public ActionResult CallbackAction()
{
    return View();
}

and inside CallbackAction.cshtml:

<script type="text/javascript">
    window.opener.doSomething(true);
    window.close();
</script>