Question

In my Asp page, i have to invoke one javascript function just before download a file in asp page. My actual requirement is i have to make sure that the downloading format whenever click the download button.

So, In my download button event i just show a div tag that contains two radio buttons(asp:RadioButton) namely docx,pdf and also one OK button.after selecting any radio button, the user will press ok Button(asp:Button).

Finally,

In the Ok Button(asp:Button) event i just hide the div tag portion and the based on the selected output format user selected,the file will be downloading.

my Ok Button event Code is given below:

   protected void OKButton(object sender, EventArgs e)
    {
        string outputType = "";
        if (docx.Checked == true)
        {
            outputType = "docx";
        }
        else
        {
            outputType = "pdf";
        }

        filename=filename+"."+outputType;
       ClientScript.RegisterStartupScript(GetType(), "popup", "hidePopUp()", true);
       bool isDownloaded=downloadFile(strURL, docPath, filename);
    }

downloadFile function is given below:

protected bool downloadFile(string srcURL, string docPath, string filenameOnly)
        {
            System.IO.FileInfo FileName = new System.IO.FileInfo(srcURL);
            FileStream myFile = new FileStream(srcURL, FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
            BinaryReader _BinaryReader = new BinaryReader(myFile);

            if (FileName.Exists)
            {
                try
                {
                    long startBytes = 0;
                    string lastUpdateTiemStamp = File.GetLastWriteTimeUtc(docPath).ToString("r");
                    string _EncodedData = HttpUtility.UrlEncode(filenameOnly, Encoding.UTF8) + lastUpdateTiemStamp;

                    Response.Clear();
                    Response.Buffer = false;
                    Response.AddHeader("Accept-Ranges", "bytes");
                    Response.AppendHeader("ETag", "\"" + _EncodedData + "\"");
                    Response.AppendHeader("Last-Modified", lastUpdateTiemStamp);
                    Response.ContentType = "application/octet-stream";
                    Response.AddHeader("Content-Disposition", "attachment;filename=" + FileName.Name);
                    Response.AddHeader("Content-Length", (FileName.Length - startBytes).ToString());
                    Response.AddHeader("Connection", "Keep-Alive");
                    Response.ContentEncoding = Encoding.UTF8;

                    //Send data
                    _BinaryReader.BaseStream.Seek(startBytes, SeekOrigin.Begin);

                    //Dividing the data in 1024 bytes package
                    int maxCount = (int)Math.Ceiling((FileName.Length - startBytes + 0.0) / 1024);

                    //Download in block of 1024 bytes
                    int i;
                    for (i = 0; i < maxCount && Response.IsClientConnected; i++)
                    {
                        Response.BinaryWrite(_BinaryReader.ReadBytes(1024));
                        Response.Flush();
                    }
                    //if blocks transfered not equals total number of blocks
                    if (i < maxCount)
                        return false;
                    return true;
                }
                catch (Exception ex)
                {
                    return false;
                }
                finally
                {
                   _BinaryReader.Close();
                    myFile.Close();
                }
            }
            else
            {
                return false;
            }

        }//downloadFile ends here...

Here, The particullar file downloaded successfully. But it did not hide the Div Tag Portion.

i tried without invoking the downloadFile function then it will hide the div tag portion successfully.

But i have to first hide the div tag portion and then download the particular file.Kindly refer my image also…

Please guide me to get out of this issue…

Answer 1

Why not hide the Div in your OKButton’s ClientClick.

For example:

<asp:Button ID="OkButton" runat="server" .... OnClick="OkButton_Click"
        OnClientClick="document.getElementById('divName').style.display = 'none';" />