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.

Georg Patscheider · Accepted Answer · 2016-02-25 19:32:53Z

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

edited Feb 25, 2016 at 19:32

answered Feb 24, 2016 at 10:32

Georg Patscheider

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14 Comments

Marco Over a year ago

While this may be a valid answer in its core, it is only a comment or a link-only-answer in its current state. It doesn't solve the OPs problem without further explanation

AndreasPettersson Over a year ago

it is a webforms app maybe I should say to you. So what the url in href attribute ?

Georg Patscheider Over a year ago

Can you warp the C# code you have shown into the code behind of a separate page and use the url of this page to load the image? It has been a long time since I used pure asp.net without MVC....

AndreasPettersson Over a year ago

hm I dont know exactly what you mean, but if I understand right I going to create a new page and call my function from page load to download the file?

Georg Patscheider Over a year ago

Yes, in MVC this function would return a FileResult , not sure what the asp equivalent is. Maybe Response.TransmitFile(file.FullName);, see stackoverflow.com/questions/8897458/…

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