SAP AT SELECTION-SCREEN EVENTS ABAP Statements

Get Example source ABAP code based on a different SAP table

AT SELECTION-SCREEN - selscreen_event

Short Reference

ABAP Syntax ... { OUTPUT }
| { ON {para|selcrit} }
| { ON END OF selcrit }
| { ON BLOCK block }
| { ON RADIOBUTTON GROUP group }
| { }
| { ON {HELP-REQUEST|VALUE-REQUEST}
FOR {para|selcrit-low|selcrit-high} }
| { ON EXIT-COMMAND }.

ABAP_ALTERNATIVES:
1 ... OUTPUT
2 ... ON {para|selcrit}
3 ... ON END OF selcrit
4 ... ON BLOCK block
5 ... ON RADIOBUTTON GROUP group
6 ... { }
7 ... ON {HELP-REQUEST|VALUE-REQUEST} FOR {para|selcrit-low|selcrit-high}
8 ... ON EXIT-COMMAND

What does it do? These additions allow individual evaluation of specific elements of the selection screens of the program. The information as to which selection has triggered the event is contained in the system field sy-dynnr.
• OUTPUT AT SELECTION-SCREEN

ABAP Alternative 1 ... OUTPUT

What does it do? This event is triggered by the dynpro event PBO of a selection screen. In the event block, the selection screen can be prepared using assignments to the data objects of parameters and selection criteria and using dynamic screen modifications.

Latest notes:The assignments to input fields in the event block AT SELECTION-SCREEN OUTPUT always affect the selection screen and overwrite the user input from previous displays of the same selection screen. Assignments in the event blocks LOAD-OF-PROGRAM or INITIALIZATION , on the other hand, only have an effect the first time the program starts.
• ON AT SELECTION-SCREEN

ABAP Alternative 2 ... ON {para|selcrit}

What does it do? This event is triggered by the dynpro event PAI of a selection screen if the content of the input field of a parameter para or a line of a selection criterion selcrit was passed to the ABAP program. The user input can be checked in this event block. Sending a warning or an error message in the event block makes the fields para and selcrit ready for input again.

No parameter that is defined as a radio button can be specified. For this purpose, the addition ON RADIOBUTTON GROUP is provided.

Latest notes:If a user action takes place in the dialog box for the multiple selection of a selection criterion selcrit, the entries of the selection table are passed to the program, line by line. For each line, the event AT SELECTION-SCREEN ON selcrit is triggered.
• ON END OF AT SELECTION-SCREEN

ABAP Alternative 3 ... ON END OF selcrit

What does it do? This event is triggered after the selection table selcrit has been fully passed to the program after a user action in the dialog box for the multiple selection has taken place. The entire s election table can be checked in this event block.
• ON BLOCK AT SELECTION-SCREEN

ABAP Alternative 4 ... ON BLOCK block

What does it do? This event is triggered by the dynpro event PAI of a selection screen if all the input fields of a block block of the selection screen were passed to the ABAP program. The user input can be checked in the event block. Sending a warning or an error message in the event block makes all the fields of the block block ready for input again.
• ON RADIOBUTTON GROUP AT SELECTION-SCREEN

ABAP Alternative 5 ... ON RADIOBUTTON GROUP group

What does it do? This event is triggered by the dynpro event PAI of a selection screen if all the fields of a radio button group group of the selection screen were passed to the ABAP program. The user input can be checked in this event block. Sending a warning or error message in the event block makes all the radio buttons of the group group ready for input again.

Latest notes:The individual fields of a radio button group are not passed individually and do not trigger the event AT SELECTION-SCREEN ON par.

ABAP Alternative 6 ... { }

What does it do? The event AT SELECTION-SCREEN itself is triggered as the last event of selection screen processing if all the input values were passed to the program. All user input can be checked in this event block. Sending a warning or an error message in the event block makes all the screen fields ready for input once again.
• ON HELP-REQUEST FOR AT SELECTION-SCREEN
• ON VALUE-REQUEST FOR AT SELECTION-SCREEN

ABAP Alternative 7 ... ON { HELP-REQUEST | VALUE-REQUEST } FOR {para|selcrit-low|selcrit-high}

What does it do? The two events ON HELP-REQUEST and ON VALUE-REQUEST are triggered by the dynpro events POH and POV of a selection screen if, for the input field of a parameter para or one of the input fields of a selection criterion selcrit , the field help F1 or the input help F4 was called. Other selection events are not triggered.

In the event blocks, a self-defined field or input field can be programmed, which overrides any helps defined in ABAP Dictionary.

Latest notes:These event blocks can only be implemented for fields of the selection screen that are defined in the same ABAP program and not in any associated logical database. The events for the field help and input help do not transport data between the selection screen and the ABAP program. As with general dynpros, suitable function modules such as RS_SELECTIONSCREEN_READ and RS_SELECTIONSCREEN_UPDATE must be used for this. The parameters and selection criteria changed for the input help are transported to the selection screen.
• ON EXIT-COMMAND AT SELECTION-SCREEN

ABAP Alternative 8 ... ON EXIT-COMMAND

What does it do? This event is triggered if the user has called one of the functions Back, Exit, or Cancel. Any cleanup actions can be executed in this event block.

Example ABAP Coding
This executable program defines a standard selection screen and a further selection screen. In the event blocks AT SELECTION-SCREEN, the input in the selection screens can be specially handled using the evaluation of the name p_carrid and the dynpro number in sy-dynnr. REPORT demo_at_selection_screen.

* Global data

DATA: spfli_tab TYPE TABLE OF spfli,
spfli_wa LIKE LINE OF spfli_tab.

* Selection screens

PARAMETERS p_carrid TYPE spfli-carrid.

SELECTION-SCREEN BEGIN OF SCREEN 500.
SELECT-OPTIONS s_conn FOR spfli_wa-connid.
SELECTION-SCREEN END OF SCREEN 500.

* Handling selection screen events

AT SELECTION-SCREEN ON p_carrid.
IF p_carrid IS INITIAL.
MESSAGE 'Please enter a value' TYPE 'E'.
ENDIF.
AUTHORITY-CHECK OBJECT 'S_CARRID'
ID 'CARRID' FIELD p_carrid
ID 'ACTVT' FIELD '03'.
IF sy-subrc = 4.
MESSAGE 'No authorization for carrier' TYPE 'E'.
ELSEIF sy-subrc <(><<)>> 0.
MESSAGE 'Error in authority check' TYPE 'A'.
ELSE.
IF sy-ucomm = 'ONLI'.
CALL SELECTION-SCREEN '0500'.
ENDIF.
ENDIF.

AT SELECTION-SCREEN.
IF sy-dynnr = '0500'.
IF s_conn IS INITIAL.
MESSAGE 'Please enter values' TYPE 'W'.
ELSE.
SELECT *
FROM spfli
INTO TABLE spfli_tab
WHERE carrid = p_carrid AND
connid IN s_conn.
IF sy-subrc <(><<)>> 0.
MESSAGE 'No flights found' TYPE 'E'.
ENDIF.
ENDIF.
ENDIF.

* Main program

START-OF-SELECTION.
...

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