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PROCESS BEFORE OUTPUT.
...
PROCESS AFTER INPUT.
...
PROCESS ON HELP-REQUEST.
...
PROCESS ON VALUE-REQUEST.
Selections are performed in PAI.
PROCESS BEFORE OUTPUT (PBO) is automatically triggered after the PAI
processing of the previous screen and before the current screen is displayed. You
can program the PBO processing of the screen in this block. At the end of the PBO
processing, the screen is displayed.
PROCESS AFTER INPUT (PAI) is triggered when the user chooses a function on
the screen. You can program the PAI processing of the screen in this block. At the
end of the PAI.
processing, the system either calls the next screen or carries on processing at the
point from which the screen was called.
PROCESS ON HELP-REQUEST (POH) and PROCESS ON VALUE-REQUEST
(POV) are triggered when the user requests field help (F1) or possible values help
(F4) respectively. You can program the appropriate coding in the corresponding
event blocks. At the end of processing, the system carries on processing the current
screen.
Can we use WRITE statement in screen fields ? If not how is data transferred
from field data to screen fields
-
We cannot write field data to the screen using the WRITE statement. The
system instead transfers data by comparing screen field names with ABAP/4
variable names. If both names are the same, it transfers screen field values to
ABAP/4 program fields and vice-versa. This happens immediately before and
immediately after displaying the screen.
How does the interaction between the Dynpro and the ABAP/4 modules takes
place ?
-
A transaction is a collection of screens and ABAP/4 routines, controlled and
executed by a Dialog processor. The Dialog processor processes screen after
screen, thereby triggering the appropriate ABAP/4 processing for each screen.
For each screen, the system executes the flow logic that contains the
corresponding ABAP/4 processing. The control passes from screen flow logic to
ABAP/4 code and back.
How does the Dialog handle user requests ?
-
When an action is performed, the system triggers the PROCESS AFTER INPUT
event. The data passed includes field screen data entered by the user and a
function code. A function code is a technical name that has been allocated in the
Screen Painter or Menu Painter to a menu entry, a pushbutton, the ENTER key
or a function key of a screen. An internal work field (ok-code) in the PAI module
evaluates the function code, and the appropriate
|
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