Download a File, then call javascript

I have the code below; I want to call a javascript function after the file has downloaded (writefile).  How can I do this?

 Private Sub FileDownload(FileName As String)

           Dim file = New FileInfo(FileName)

            Response.AddHeader("content-disposition", "attachment; filename=" + file.Name)
            Response.AddHeader("Content-Type", "application/Excel")
            Response.AddHeader("Content-Length", file.Length.ToString())
            Response.ContentType = "application/"
         '  Response.Write("<script language=javascript>alert('ERROR');</script>")


End Sub
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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
perhaps you can use AJAX to achieve this?

  method: "POST",
  url: "yourPage.aspx",
  data: { filepath: yourfileName }
  .done(function( msg ) {

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in "yourPage.aspx", it calls the sub FileDownload with a parameter to pass in the filepath

more info:

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