Fire javascript function after download asp.net

Question

I have a method in code behind which downloads a file from server to the client. And after that I want to run a javascript function. But it does not work. It works only if the javascript function is in the button click event.

string imageFilePath = Server.MapPath("~/TireLabel.png");
        Bitmap bitmap = (Bitmap)Image.FromFile(imageFilePath);//load the image file

        Graphics g = Graphics.FromImage(bitmap);
        string text = "215/45 R 20";
        g.DrawString(text, drawFontArial26Bold, drawBrush, new RectangleF(x, y, width, height), drawFormatCenter);

        text = "013";
        g.DrawString(text, drawFontArial20Regular, drawBrush, new RectangleF(70, 45, 0, 0), drawFormatRight);

        text = "1";
        g.DrawString(text, drawFontArial20Regular, drawBrush, new RectangleF(100F, 80, 0, 0), drawFormatRight);

        text = "2";
        g.DrawString(text, drawFontArial20Regular, drawBrush, new RectangleF(240, 80, 0, 0), drawFormatRight);

        Bitmap bit = new Bitmap(bitmap);
        bit.Save(Server.MapPath("~/TireLabel.bmp"), System.Drawing.Imaging.ImageFormat.Bmp);

        Response.ContentType = "application/jpeg";
        Response.AddHeader("content-disposition", "attachment; filename=" + Server.MapPath("~/TireLabel") + ".bmp");
        Response.WriteFile(Server.MapPath("~/TireLabel.bmp" + ""));

        ClientScript.RegisterStartupScript(GetType(), "key", "runPrint();", true); // THIS does not fire.

//Javascript function
function runPrint() {
        var objShell = new ActiveXObject("WScript.Shell");
        var strCommand = "C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe";
        //var strCommand = "C:\\PrintLabel.exe";
        objShell.Exec(strCommand);
        //objShell.ShellExecute(strCommand, "","","open","1");
    }

How I can make the javascript fire.

Answer 1

This is a hard problem, because the browser normally doesn't tell you when a download is finished. Have a look at jQuery.filedownload that allows you to download files through AJAX.

-- Edit --

Here is the code to attach jQuery filedownload to all links with the class "fileDownload":

 $(document).on('click', 'a.fileDownload', function() {        

   $.fileDownload($(this).prop('href'))
            .done(function () { alert('File download a success!'); })
            .fail(function () { alert('File download failed!'); });

        return false; //this is critical to stop the click event which will trigger a normal file download
});

This assumes that the URL to the controller action is given in the href attribute of the link, and this action returns a file with return File() . The response must also contain a cookie /fileDownload to inform jquery.fileDownload that a successful file download has occured.

//jquery.fileDownload uses this cookie to determine that a file download has completed successfully
response.AppendCookie(new HttpCookie("fileDownload", "true") {
    Path = "/"
});

-- Edit 2 - Changed source to show simpler example with less dependendies. Use the .done promise to trigger an action after the download was done