Disable parameter

Q:

Dear all,
I have parameters in my ABAP/4 reporting program:
parameters: date like sy-datum,
division (1) type c.
parameters: r1 radiobutton group rad1,
r2 radiobutton group rad2.

How to change below code into ABAP/4 language
if r1 ne space.
division = invisible.
elseif r2 ne space.
divisio = visible.
endif.

thank you

A:

Try something like this in the even AT SELECTION-SCREEN or AT SELECTION-SCREEN
OUTPUT (whichever makes sense for what you are doing...)

LOOP AT SCREEN.

If screen-name = division.
if r1 ne space.
screen-invisible = 1.

elseif r2 ne space.
screen-invisible = 0.
endif.
modify screen.
endif.

ENDLOOP.

You may also try adding a statement for screen-input and/or screen output
instead. That way they are still visible, but you can't change them.