We help IT Professionals succeed at work.
Get Started

How To Change File Name On Front End Automatically In An ASP Upload

Last Modified: 2008-01-09
I am working with a client now who wants to upload files to his web server using ASP/VBScript.  I found a nice little script to do it quick and dirty at


However, client is now (justifiably) worried about duplicate file names; this script doesn't handle them--it simply overwrites the old file.

Is there a way I can customize file names on the front end so as to avoid duplicate file names?  I want to avoid installing components on the web server b/c the server admin is uncomfortable doing it, and it's potentially costly, etc.  Plus, we just had a whole lot of trouble with permisions to get dynamic DB app working, so I hate to make another server request unless I absolutely have to!

I am pretty good with Javascript, but not so great with ASP/VBScript (I let DW 8 do that for me).  I tried creating a new Recordset on the page and customizing the form field value with a dynamically generated unique field in the DB (such as ID or firstname = lastname), but I kept making the VBScript angry and crashing the whole app! (Variety of errors--but mainly "Must use only one instance of % on ASP page"--pretty obvious to me what it means but not savvy enough with VBScript to fix!)

Any help would be appreciated.  I have a feeling this might be solvbed with something fairly simple, but I am too "in the middle of things" right now to see clearly!

Here is the code I took from freeaspload.net, with just a few lines tailored for my purposes.  The code is one page that serves as both the form and the processor of form.  It is published on a web server running IIS.

<%@ Language=VBScript %>
option explicit
Response.Expires = -1
Server.ScriptTimeout = 600
<!-- #include file="freeASPUpload.asp" -->

' ****************************************************
' Change the value of the variable below to the pathname
' of a directory with write permissions, for example "C:\Inetpub\wwwroot"
  Dim uploadsDirVar
  uploadsDirVar = "C:\Inetpub\wwwroot\wn\db"
' ****************************************************

' Note: this file uploadTester.asp is just an example to demonstrate
' the capabilities of the freeASPUpload.asp class. There are no plans
' to add any new features to uploadTester.asp itself. Feel free to add
' your own code. If you are building a content management system, you
' may also want to consider this script: http://www.webfilebrowser.com/

function OutputForm()
    <form name="frmSend" method="POST" enctype="multipart/form-data" action="uploadTester.asp" onSubmit="return onSubmitForm();">
      <B>File names:</B><br>
    File 1: <input name="attach1" type="file" size=35><br>
      <!-- These input elements are obviously optional and just included here for demonstration purposes -->
      <B>Additional fields (demo):</B><br>
      Enter a number: <input type="text" name="enter_a_number"><br>
    Checkbox values: <input type="checkbox" value="1" name="checkbox_values">-1 <input type="checkbox" value="2" name="checkbox_values">-2<br>
      <!-- End of additional elements -->
    <input style="margin-top:4" type=submit value="Upload">
end function

function TestEnvironment()
    Dim fso, fileName, testFile, streamTest
    TestEnvironment = ""
    Set fso = Server.CreateObject("Scripting.FileSystemObject")
    if not fso.FolderExists(uploadsDirVar) then
        TestEnvironment = "<B>Folder " & uploadsDirVar & " does not exist.</B><br>The value of your uploadsDirVar is incorrect. Open uploadTester.asp in an editor and change the value of uploadsDirVar to the pathname of a directory with write permissions."
        exit function
    end if
    fileName = uploadsDirVar & "\test.txt"
    on error resume next
    Set testFile = fso.CreateTextFile(fileName, true)
    If Err.Number<>0 then
        TestEnvironment = "<B>Folder " & uploadsDirVar & " does not have write permissions.</B><br>The value of your uploadsDirVar is incorrect. Open uploadTester.asp in an editor and change the value of uploadsDirVar to the pathname of a directory with write permissions."
        exit function
    end if
    If Err.Number<>0 then
        TestEnvironment = "<B>Folder " & uploadsDirVar & " does not have delete permissions</B>, although it does have write permissions.<br>Change the permissions for IUSR_<I>computername</I> on this folder."
        exit function
    end if
    Set streamTest = Server.CreateObject("ADODB.Stream")
    If Err.Number<>0 then
        TestEnvironment = "<B>The ADODB object <I>Stream</I> is not available in your server.</B><br>Check the Requirements page for information about upgrading your ADODB libraries."
        exit function
    end if
    Set streamTest = Nothing
end function

function SaveFiles
    Dim Upload, fileName, fileSize, ks, i, fileKey

    Set Upload = New FreeASPUpload

      ' If something fails inside the script, but the exception is handled
      If Err.Number<>0 then Exit function

    SaveFiles = ""
    ks = Upload.UploadedFiles.keys
    if (UBound(ks) <> -1) then
        SaveFiles = "<B>Files uploaded:</B> "
        for each fileKey in Upload.UploadedFiles.keys
            SaveFiles = SaveFiles & Upload.UploadedFiles(fileKey).FileName & " (" & Upload.UploadedFiles(fileKey).Length & "B) "
        SaveFiles = "The file name specified in the upload form does not correspond to a valid file in the system."
    end if
      SaveFiles = SaveFiles & "<br>Enter a number = " & Upload.Form("enter_a_number") & "<br>"
      SaveFiles = SaveFiles & "Checkbox values = " & Upload.Form("checkbox_values") & "<br>"
end function

<TITLE>Test Free ASP Upload</TITLE>
BODY {background-color: white;font-family:arial; font-size:12}
function onSubmitForm() {
    var formDOMObj = document.frmSend;
    if (formDOMObj.attach1.value == "" && formDOMObj.attach2.value == "" && formDOMObj.attach3.value == "" && formDOMObj.attach4.value == "" )
        alert("Please press the browse button and pick a file.")
        return true;
    return false;



<div style="border-bottom: #A91905 2px solid;font-size:16">Upload files to your server</div>
Dim diagnostics
if Request.ServerVariables("REQUEST_METHOD") <> "POST" then
    diagnostics = TestEnvironment()
    if diagnostics<>"" then
        response.write "<div style=""margin-left:20; margin-top:30; margin-right:30; margin-bottom:30;"">"
        response.write diagnostics
        response.write "<p>After you correct this problem, reload the page."
        response.write "</div>"
        response.write "<div style=""margin-left:150"">"
        response.write "</div>"
    end if
    response.write "<div style=""margin-left:150"">"
    response.write SaveFiles()
    response.write "<br><br></div>"
end if


Watch Question
This problem has been solved!
Unlock 1 Answer and 5 Comments.
See Answer
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE