Hide/Show a field in a Version

Hi,
I want to hide/show a field in a Version (not the value of the field) at runtime.
For example I have a dropdown field (FIELD1) and 2 more fields (FIELD2, FIELD3) and when I select a specific value from the dropdown I want FIELD2 to be displayed (if it was hidden), or to be hidden (if it was displayed).

In addition to the above how do I set a field to be hidden when loading the version?
Is it with attribute "NODISPLAY"? And then with a VVR routine to make it displayable (question above)?

I am using Desktop R13.
Thanks

Yes I agree with you.
This is what I also had in mind.
Though I remember seeing this somewhere but I can't recall how it was done.
If I find something I will let you know.

Thanks for your attention !!!

Not actually.
This is just to hide the value of the field.
What I want is to hide/show the field.

Hi friend, dis you solve the problem? If yes, please show me your solution, thank you so much!

I have the problem same with you
R.VERSION(EB.VER.DISPLAY.TYPE)<1,4> = 'NODISPLAY'
CALL REBUILD.SCREEN
The field that I specify <1,4> not hidding when i call REBUILD.SCREEN.

Hi,
The question is WHEN (at what stage) do you want to make a field as "NODISPLAY".
If you want to do it before the Version is loaded (i.e. at VID, or VCH) then it is for sure doable.
I guess that there are 2 options at this point. Either changing the R.VERSION (like you do) or setting the T array as I did.
(For changing the R.VERSION also see JPB comments above)

Now, if you want to do it after the Version is loaded, this is where I was having the problem (again I was using the T array).
Even calling REBUILD.SCREEN, the field was shown. Only if I changed tabs and came back it worked.
I'm not sure though that changing the R.VERSION at this point makes any sense (again please see JPB comments above)

I hope it helps.

Thank you for answer!
Yeah i take that at stage " after the Version is loaded" (i used validation routine for case) & it not working. But i see some function in t24lib: REFRESH.FIELD, REDISPLAY.FIELD. may be they solve our problem, but I don't know how to use them, and you? I can't find any documentation about 2 functions that are on the Internet.

I don't know about REDISPLAY.FIELD.
REFRESH.FIELD is for refreshing a single field (REBUILD.SCREEN is doing the same but for all fields).
So, since REBUILD.SCREEN didn't work, neither REFRESH.FIELD will.

REDISPLAY.FIELD is just setting T.SEQU for the field send over (AF,AV,AS) if it is on the current version.