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Asked: 2026-05-11T12:07:31+00:00

I can’t get this CustomValidator working. In the <head>: <script language=javascript type=text/javascript> function ValidateFile(sender,

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I can’t get this CustomValidator working.

In the <head>:

<script language='javascript' type='text/javascript'>   function ValidateFile(sender, args){       alert('Hi');        args.IsValid = document.getElementById('fuFile').value != '' ||                       document.getElementById('c101_c7').value != '';   } </script>

In the body:

<asp:FileUpload ID='fuFile' runat='server' size='70'/> <asp:TextBox ID='c101_c7' class='textbox' runat='server'/> <asp:CustomValidator ID='vldFile' runat='server' ClientValidationFunction='ValidateFile'     ErrorMessage='You must either upload a file or provide a URL of a file.'></asp:CustomValidator>

What should be in the args.IsValid if either the FileUpload or TextBox has to be filled in?

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1 Answer

  1. This works

    document.getElementById('ctl00_ContentPlaceHolder1_fuFile').value
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