I invite you to have a look at the related code in the .js plugins and the form at the beginning of the document body (index.html).
The generator works great so far and upon entering any value deviating from the valid character count in a Bitcoin address (25-34 chars), it defaults to a generic error msg in the QR code.
I want this to be a little more sophisticated and revert to the same error msg whenever the user enters any non-alphanumeric characters (i.e. spaces, punctuation, etc.; valid input doesn't HAVE to be limited to BASE58, but would be really cool.)
I'm only just learning JavaScript, so if anybody skilled enough has some spare minutes to spend on this, you'll make me happy!
Reply in the comments or PM me. Payment: .1 BTC.
TIA
Done. Thanks to NLNico and his Javascript wizardry.