Validate a Scanned QR code and remove drop down selection

[Mike_T]

I’m trying to force the user to enter the info into the form using a QR code only. At the same time, I want the user to be given an error message if the QR code has already been scanned. (I.e. “This QR Code was scanned on XXX date by XXXX person”. Both of these pulled from another table.

I’ve used REF as my column type but this allows the user to view and select the QR code from a drop down menu. Thoughts?

[Steve · Accepted solution]

It appears in your case a valid code is one that does not occur in another table. Try a Valid If expression of:

NOT(IN([_THIS], another-table[qrcode-column]))

replacing another-table and qrcode-column appropriately.

You can the use the Invalid value error expression to generate an appropriate error message.

[Mike_T]

Nevermind, seems to be working fine now after a couple closed apps and resyncs. Thanks again!

[Mauricio_Bick]

@Steve 

I tried your suggestion but it didn’t work.

This badge # exists in the “other table”.   It’s been awhile since this post.  By any chance do have another solution?

Thank you.

[Mauricio_Bick]

@Steve 

Disregard Steve I found another post that you were in and your solution worked!

Thank you, Sir!

[Mike_T]

This works however just using the default error message locks up the app. Not able to rescan, cancel or save. Can’t even go back to earlier screen. bug?