Can a text field be set to accept only specific letters?

[tk7170]

I'm not a developer, although I can hack through code. I can't seem to find an answer for what seems to be a basic question.
I'm trying to set a a text field to accept only specific capitalized letters.
Any help would be wonderful.
Thanks in advance
(Acrobat Pro DC)

[jane-e]

Would it would to create a drop down list with those specific capitalized letters?

[tk7170]

I wanted to avoid a dropdown b/c the field is wide enough for one letter and the dropdown arrow would be problematic.

Can a text field be set to accept only specific letters?

[sergiy2511]

I think you would need to go for regular expressions in the field validation

[tk7170]

I wanted to avoid a dropdown b/c the field is wide enough for one letter and the dropdown arrow would be problematic.

[try67]

You can do it with the following custom validation script:

if (event.value) event.rc = /^[AVXZBD]$/.test(event.value)

Edit: To clarify, the allowed letters are those between the square brackets.

[tk7170]

Thanks. I'll try it out.

[tk7170]

Unfortunately, that didn't work when placed in the Validate > Run custom validation script area nor the Format > Custom Keystroke Script of the Text Field Properties

Thanks anyway.

[try67]

Worked fine for me. What happens when you try it? Also, did you edit the code in any way? If so, how?

[tk7170]

I didn't alter the code except to change the input characters in the brackets to [ACD].
The code didn't change anything; text field functioned as a text field.

if (event.value) event.rc = /^[ACD]$/.test(event.value)

[try67 · Accepted solution]

Just to clarify: This code will not prevent the user from entering the not-allowed characters, but it will reject the new value once you exit the field. If you want it to only allow them to enter those characters then you can use this as the Keystroke script:

event.rc = /^[ACD]?$/.test(AFMergeChange(event));

(It's normal if the script disappears once you enter it. It should still work)

[tk7170]

I appreciate your assistance, but neither pieces of code work for me.

Thanks anyway.

[tk7170]

I take that back. The code: event.rc = /^[ACD]?$/.test(AFMergeChange(event));
is functioning as only allowing an A C or D

Thank you very much