Javascript issues for a PDF form

Question

Hi everyone,
I hope someone can help me, i posted a few days ago but managed to find a script somewhere online to do half of what i needed.
//-----------------Do not edit the XML tags--------------------
//<Document-Level>
//<ACRO_source>Numbering</ACRO_source>
//<ACRO_script>
/*********** belongs to: Document-Level:Numbering ***********/
var f = this.getField("Tracking Number");
if (f.value=="") f.value = "0001001";
else f.value = util.printf("%04d", (Number(f.value)+1));
//</ACRO_script>
//</Document-Level>
Problem I have now is that it will only update the Tracking Number field (field is after the A) when i save the original document, not when i save as a copy. This will be accessed by multiple people and what i want is the number to update each time it is saved as a copy (so there will never be two documents with the same number, VERY IMPORTANT). This document is essentially a digital carbon copy form then sales reps use.
I was also hoping there can be a script written to update the file name with the tracking number, so it rules out human error - the script will Save a copy, in a designated folder, with a set file name (Booking_form_#customername_#trackingnumber.pdf)
Am i just hoping for too much?

Answer 1

Regarding the server, I was referring to setting up a web server with a script that the form could sumit a request to whenever it needed an new number, not a file server where the PDF resides. The server would check a database and reserve a new number and return it to the form for use. This would require some server programming, but it's the best way to do it. The problem is it won't work with Adobe Reader on mobile devices.
This type of thing is indeed a common thing to want, but it's hard to do from within the document itself since there's no way of knowing what other users are doing. With a physical book or invoice pad, it's not possible to use a number more than once like it is with a multi-user e-form that's not controlled by a server.