SAP ABAP uses events to trigger the specific codes in a pre-define sequence. The ABAP events are:
You can define following thing in domain-
In Definition Tab
1. INITIALIZATION
2. AT SELECTION-SCREEN
3. START-OF-SELECTION
4. TOP-OF-PAGE
5. TOP-OF-PAGE DURING LINE SELECTION
6. END-OF-PAGE
7. END-OF-SELECTION
8. GET
9. GET LATE
There are different events for list processing interactive reports. They are:
1. AT LINE-SELECTION.
2. AT USER-COMMAND.
3. AT PFn.
The INITIALIZATION event is processed only in the case of SUBMIT, not CALL SELECTION-SCREEN. The END-OF-PAGE event is executed whenever processing
reaches that area when formatting a list page or if the RESERVE statement detects that there is insufficient space remaining on the current page.
The END-OF-SELECTION event is triggered in type 1 programs once the logical database has finished reading all data and before the list processor is started.
Note: Since INITIALIZATION is only executed once when you start the report, it is not suitable for screen modifications such as
suppressing individual parameters.
What are the AT SELECTION-SCREEN events?
The event AT SELECTION-SCREEN get trigger while the selection screen is being processed. Following are the AT SELECTION-SCREEN events-
1. AT SELECTION-SCREEN OUTPUT
2. AT SELECTION-SCREEN ON 'field'
3. AT SELECTION-SCREEN ON END OF sel
4. AT SELECTION-SCREEN ON VALUE-REQUEST FOR psel_low_high
5. AT SELECTION-SCREEN ON HELP-REQUEST FOR psel_low_high
6. AT SELECTION-SCREEN ON RADIOBUTTON GROUP radi
7. AT SELECTION-SCREEN ON BLOCK block
8. AT SELECTION-SCREEN
9. AT SELECTION-SCREEN...ON EXIT-COMMAND
What are the SELECTION-SCREEN variants available?
Following are the SELECTION-SCREEN variants available -
1. SELECTION-SCREEN BEGIN OF BLOCK block
2. SELECTION-SCREEN BEGIN OF TABBED BLOCK block FOR n LINES.
3. SELECTION-SCREEN END OF BLOCK block.
4. SELECTION-SCREEN TAB (len) tabname USER-COMMAND ucomm.
5. SELECTION-SCREEN BEGIN OF LINE.
6. SELECTION-SCREEN END OF LINE.
7. SELECTION-SCREEN POSITION pos.
8. SELECTION-SCREEN ULINE.
9. SELECTION-SCREEN COMMENT fmt name.
10. SELECTION-SCREEN PUSHBUTTON fmt name USER-COMMAND ucom.
11. SELECTION-SCREEN SKIP n.
12. SELECTION-SCREEN FUNCTION KEY n.
