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Posted by larry on 02/22/07 04:09
Technically you would have a single text field input on your POS
system. you type and enter (or scan) something and then press return,
and process the data.
Depending on what is scanned or typed it does an action. (you can
also have button inputs, which can be used in addition to the text
field.
I.E. you scan a barcode on a package (the form POSTs it), the system
next determines it as it as a UPS code and then goes and checks the
inventory and adds the record into the session or whatever add it to
the tallying list.
Make a mistake, have a price change, etc., have a control code, like a
pre-printed scan for a cancel code, scan that to instruct your program
DB to cancel the next scanned item, then scan the barcode of the
canceled item, etc.
You will need to make a whole set of control codes for such things as
discounts returns, etc. as well as a system for processing the
collected data once you have the checkout complete.
That's about the basics of it.
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