Text Field allow to only specific character

[omanbux]

Hi, i want to add a condition to a text field. so it should only allow to type "Y" , "N" or "U". can u pls help me to manage this work. thanks..

[ls_rbls]

Does it needs to be achieved with a script?

You can achieve that with a  a dropdown menu. 

Just add the Y , N , U options in the  list items and uncheck the box that says Allow users to type, then lock the field

[ls_rbls]

Hi, 

Just wondering if you were able to resolve your this exercise.

If your still looking for  a condition I found this thread: https://community.adobe.com/t5/acrobat/how-to-allow-only-certain-characters-to-be-typed-in-a-field/t...

So you can modify your script like 

if (event.change) {

     event.rc = /^[N,n,U,u,Y,y]/.test(event.change);

}



//if you need to restrict the N, U and Y letters to uppercase only modify the script above like this:

if (event.change) {

     event.rc = /^[N,U,Y]/.test(event.change);

}



//PLAYING AROUND WITH THIS LITTLE SCRIPT I NOTICED THAT THIS ALSO WORKS

if (event.change) {

     event.rc = /^[N,n,U,u,Y,y]/.test(event.change);

}

event.change = event.change.toUpperCase(); 

If you are using the dropdown menu method like I suggested in my first reply, and you are allowing users to also enter their own text and need to  restrict the them  to  typen only  one of those three letters see image below: