Accept data from serial port into an input box?

How can I get some data that comes in on a computer's serial port into
a text box on a web page? I assume I need to use Javascript in some
manner - or maybe not?

I have a situation where I'll be serving a page out to a computer that
is equipped with a barcode scanner attached to it's serial port. When
the user scans a barcode, I want it to appear in the text field. Then,
when the user hits the enter key, the page will submit to the server
for processing.

FWIW, this is all on a LAN - no internet usage involved.
.

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