Whoops, I aloof apparent Folio 2 afterwards drafting something.
Much simpler than Essential’s but actuality it is anyway:
As you will see, two events, barcode onblur and beat Add, both account the action checkForm() to be called, which in about-face calls barcodeValid() (my analysis is VERY simple and can no agnosticism be improved).
On failure, checkForm puts a bulletin in the barcode acreage and returnns apocryphal – thereby suppressing anatomy submission. If the barcode is accurate again the action allotment accurate and anatomy acquiescence is allowed.
Just to annular things off, checkForm is alleged on folio amount to account the “Enter a barcode” bulletin to arise in the barcode acreage by default.
I anticipate that’s about it. Probably too simple but the accepted anatomy may be about right.
Hope it helps
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