Dialog Programming.(Module Pool)

ABAP Dialog Programs are ABAP programming that accept user input and allow an interaction between the program and the user,They have to be associated with a transaction code in which the initial screen is specified.

Using dialog programming, a user can interact with the program by entering data, selecting a menu item, by clicking on a data item or display button. Also, using dialog programming, a user may navigate back and forth in between screens. Transaction Code is SE80. Flow Logic Events :- 1. Process Before Output (PBO) :- Triggered before MPP screen is displayed. 2. Process After Input (PAI) :- Triggered after MPP screen is displayed      whenever user raises an action. Also,Now PBO is also triggered. 3. Process On Value Request (POV) :- It is used For F4 HELP. 4. Process On Help Request (POH) :- It Is Used For F1 HELP. Include Programs in MPP :-  1. Include Top :- Top Include Programs , All Data Declaration. 2. Include I01 :- PAI Include Program , Logic Related To PAI EVENT. 3. Include O01 :- PBO Include Program , Logic Related To PBO EVENT. 4. Include F01 :- Forms Include Program ,Logic Related To Subroutine. Dynamic Screens :-  SY-UCOMM. :- System User Command. Represented as Follows.  CASE SY-UCOMM WHEN 'BACK'   LEAVE TO SCREEN 0. WHEN 'EXIT'   LEAVE PROGRAM. WHEN 'CANCEL'.   LEAVE SCREEN. ENDCASE. Screen Painter  :- Screen Painter Window  1. Elements in Screen Painter :- It has elements to Draw Layout like text field , radio button , tabstrip , custom control etc

Application Bar Has Components like dictionary input field , name & Text Layout 

Dictionary Input Field  :- we Can Pickup Required Field From Dictionary  and can draw layout