Javascript无法使用Ajax ASP.Net进行response.redirect

Question

I am redirecting the ASP.Net page to download page and i'm using ajax. The redirect page does work, the file is downloaded and the page that called the download is showing. I need to call javascript after the file is downloaded to remove the waiting screen.

I am first calling redirect then javascript to unblock the UI. to block the UI i'm doing that using onclientclick='block()';

  Response.Redirect("ExportFile.aspx, false);
 ScriptManager.RegisterClientScriptBlock((this), this.GetType(), "alertAction", "alert('');unblock();", true);

even the alert isn't working so the JS isn't being fired at all. I tired putting the code on the file download page but that doesn't work either. I even tried body onpageunload but that never fires either.

How can I redirect to a file download page then call JS to unblock the UI?

Answer 1

Once response.redirect happens, no other code can execute. I would suggest to write your redirect code in javascript and put it into your RegisterClientScriptBlock. Just make sure the unblock is before the window.location.

ScriptManager.RegisterClientScriptBlock((this), this.GetType(), "alertAction", "unblock(); window.location.assign('yourPage.aspx');", true);

Answer 2

boruchsiper is correct. Also, once you've redirected them, you're on a different page (if my assumption is correct that you're redirecting to a different page). You would want to fire off this line after arriving at the new page, so you'd want it in that page's code behind in the Load() function:

ScriptManager.RegisterClientScriptBlock((this), this.GetType(), "alertAction", "alert('');unblock();", true);

You may want to include a query string in that redirect URL to tell that page to take that action.