DIALOG OR MODULE POOL PROGRAMMING .
This is one of the most favorite topic for interviewer , but if you are in implementation then you have chance of working on module pool or designing a custom screen .
So lets go in depth what is module pool and why is it used and what are the events that are related to module pool programming.
why module pool programming is required ?
If your ABAP program demands user input , Dialog programming/module pool programming is used.
Component of Module pool Programming:
1:SCREEN
2:T-CODE
3:GUI STATUS
4:ABAP PROGRAM
5:SCREEN FLOW LOGIC
6:DYNPRO(Combination of screen with flow logic)
now let us understand each term is an easiest way possible :
SCREEN:-These are main consitient in module pool as there could subscreen , multiple screen attached in screen ,screen is where you design your screen layout for module pool programming.
screen can be created from se80 by right clicking on the program name then click on create then screen
or you can go to SE51(SCREEN PAINTER ) AND CREATE SCREEN.
TRANSACTION CODE:-Module pool cannot run without t-code , it cannot be executed directly as like report , so t-code is very essential for running the code.
T-CODE can be created using SE93.
GUI -STATUS:- Each screen has a GUI status(es) which are independent components of a program.
This controls the menu bars, standard toolbar, application toolbar , with which the user can choose functions in the application.You can create gui status so that you could even add own push button etc.
ABAP-PROGRAM: The ABAP program contains the dialog modules that are called by the screen flow logic, and also process the user input, fields ,value request ,help adn inputs from the GUI status.
FLOW LOGIC:- Screen Flow logic is primarily divided into four components.
- Process Before Output (PBO) event: which is processed before the screen is displayed
- Process After Input (PAI) event: which is processed after a user action on the screen
- Process on help request (POH): which is processed when F1 is pressed.
- Process on value request (POV):which is processed when F4 is pressed
DYNPRO:-A screen together with its Flow logic is called a Dynpro ("Dynamic Program" since the screen flow logic influences the program flow). Each dynpro controls exactly one step of your Dialog Program.
INTERVIEW QUESTION ON MODULE POOL:(link will be updated by 25th sept 2018 )
