Help needed in screen flow

Question

hi every one
i have a screen with a mandatory field
when i click in 'BACK' it should not leave the screen because the field is mandatory.
when i click on 'CANCEL' it should come out of the screen.
and when i click on 'EXIT' it should come out of the screen.
how to code all these three conditions in my program.
vamsi

Answer 1

hi,
i have a screen with a mandatory field
when i click in 'BACK' it should not leave the screen because the field is mandatory.
when i click on 'CANCEL' it should come out of the screen.
and when i click on 'EXIT' it should come out of the screen.
how to code all these three conditions in my program.
in pbo event
loop at screen.
  if screen-name =  'text field name'.
      screen-input = 1.
modify screen.
endif.
endloop.
in pai event.
data: ok_code like sy-ucomm.
ok_code = sy-ucomm.
case ok_code.
when 'back'.
            leave to screen 200. [going one screen back]
when 'exit'
         'cancel'.
              leave screen 0 or leave program. [back from all screens]
endcase.
if helpful reward some points.
with regards,
suresh babu aluri.