Expression to avoid entering of the barcode not from the given list

[NNN]

Hi, I have a field for barcode scanning (I use a usb scanner). I need to prevent a user from entering a barcode which is not in the list (column Barcode, Table ‘Items’). I tried Data Validity (Valid if=), but it gives me a drop-down list in the field for barcode scanner.
Could you show me the direction, please?

[Suvrutt_Gurjar]

Could you try a valid_if condition something like

IN([_THIS], Items[Barcode])

[NNN]

Thank you for your answer. I tried to use your advice, but I get a dropdown list in that field with all the barcodes I have. And I use this field to scan barcodes with a usb barcode scanner.
Is there any other option to forbid entering of the barcodes which are not in the list?

[Suvrutt_Gurjar]

Please share the screenshot of that column’s settings

[NNN]

Here are the settings of the column for barcode scanner:

and

I hope this is the wight way to show the column’s settings…

[Suvrutt_Gurjar]

NNN:

And I use this field to scan barcodes with a usb barcode scanner.

Thank you. In the shared images by you, there is no valid_if setting. Basically, we wanted to know how you have entered the valid_if formula since the query is related to Valid_if.

The use of valid_if in bar code scanning is common. Even though in your case , I am unsure how the USB connected scanner will behave and if it has any specific additional settings etc.
Please refer to the post below wherein a barcode scanner Valid_if is used. The valid_if expression is different but just wanted to share that valid_if setting is common for barcodes. If it is meant to return YES/ No result, it should not display a list. The expression I requested, results into a YES/No result.

Suvrutt_Gurjar:

IN([_THIS], Items[Barcode])

help.appsheet.com

Valid_If Column Constraint

How to check if a given form input is valid based on its type.

Does a scanned field override the field's validation? Questions

We have the following validation in place on a scannable field. The user scanned a barcode into the field and it looks like a period was generated but the field allowed it to be saved. Does a scan override the field’s validation or is there a validation expression problem? [image]

[NNN]

Thank you for your answer. I examined the Valid_If Column Constraint article and the use of the function IN(). Unfortunately, I couldn’t find another example for my problem. And again when I use the valid_if condition IN([_THIS], Items[Barcode]) I still get a dropdown list. Here are the screenshots. The valid_if condition is set only for the first field BARKOD 1:

And here are the column’s settings with the valid_in condition:

[Marc_Dillon · Accepted solution]

Valid if "included in column" Questions

Valid If will generate a dropdown if the expression produces a list result, or if the entirety of the expression is an IN() expression. Any other expression will be expected to produce a Yes/No result and will not present a dropdown to the user. Given that, the way to test that a value is in a list without presenting a dropdown to the user is to wrap the IN() expression in some other benign expression: AND(IN([_THIS], select(Reservations[Reservation ID], [Client] = [_thisrow].[Name])), TRUE) (…

[NNN]

Yes! Thank you very much for this link to the similar question. The adding of AND() is a solution of “valid_if” without a dropdown list.

AND(IN([_THIS], Items[Barcode]), TRUE)