How to auto-populate a list menu or textfield from a text file

I have a submission page where a user enters their contact information. They also have to enter a specific case number for their submission. Issue is that some users enter case numbers that are not in the system.

I have created a way for real case numbers to automatically populate a text file (*.txt) on a daily basis. The main issue I have is how to force users to either enter or select the correct case number. There are roughly 250 case numbers and the format is the same for the case numbers.

Any suggestions along with direction (web pages/sites) are greatly appreciated. Can I use JavaScript? What about AJAX? The page is written in classic ASP but I'm willing to modify to accomplish my needs.

Thank you for your suggestions and direction.
arendt73Asked:
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Gurvinder Pal SinghCommented:
rather than asking user input in a text box, show the user a drop down below the text box (like auto-suggest) and force him to select from that drop down rather than accepting from textbox.

something like this
http://www.pengoworks.com/workshop/jquery/autocomplete.htm
ProculopsisCommented:
<!--

Try jQuery AutoComplete

-->

<!DOCTYPE html>
<html>
<head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title> - jsFiddle demo</title>
 
  <script type='text/javascript' src='http://code.jquery.com/jquery-1.7.1.js'></script>
  <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.16/jquery-ui.js"></script>
 
<script type='text/javascript'>//<![CDATA[

jQuery(document).ready(function() {

    $("input#autocomplete").autocomplete({
        source: ["1000", "1001", "1002", "1003", "1004", "1005", "1006", "1007", "1008", "1009"]
    });


});
//]]>  

</script>

</head>
<body>

  <input id="autocomplete" />

 </body>
</html>
arendt73Author Commented:
Proculopsis, thank you. I'll give this is shot.  In the meantime, the autocomplete source will be a text file (info.txt). What would the code look like pointing to the text file?
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ProculopsisCommented:
For the source option you can use a url pointing to the data, you just need to make the file available on your server, at that location.
arendt73Author Commented:
So instead of what you have currently now,

source: ["1000", "1001", "1002", "1003", "1004", "1005", "1006", "1007", "1008", "1009"]

It would look like this?

source: www.myserver.net/test/test.txt

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arendt73Author Commented:
Solution given acceptable.
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