At selection screen on the field and at selection screen are selection-screen events which are used for input validations in SAP report programming.
| At Selection Scteen on Field | At Selection Screen |
|---|---|
| This event is used to validate a single input field. | This event is used to validate multiple input fields. |
| If we this event, if any, error the error field will be highlighted and the remaining fields will be disabled. | By using this event, the error field is heightened and all the remaining fields will be enabled. |
Example to explain At Selection-Screen on the field and At Selection-Screen difference.
In the below example we are going to validate two input fields and we will see the difference in screen behavior.
| At Selection Screen | At Selection Screen on Field |
|---|---|
REPORT ZSPN_SELECTION_SCREEN_EVENT.
PARAMETERS P_FIELD1 TYPE CHAR10 .
PARAMETERS P_FIELD2 TYPE CHAR10.
AT SELECTION-SCREEN.
IF P_FIELD1 IS INITIAL.
MESSAGE 'Please enter field1' TYPE 'E'.
ENDIF.
IF P_FIELD2 IS INITIAL.
MESSAGE 'Please enter field2' TYPE 'E'.
ENDIF.
|
REPORT ZSPN_SELECTION_SCREEN_EVENT.
PARAMETERS P_FIELD1 TYPE CHAR10 .
PARAMETERS P_FIELD2 TYPE CHAR10.
AT SELECTION-SCREEN ON P_FIELD1.
IF P_FIELD1 IS INITIAL.
MESSAGE 'Please enter field1' TYPE 'E'.
ENDIF.
AT SELECTION-SCREEN ON P_FIELD2.
IF P_FIELD2 IS INITIAL.
MESSAGE 'Please enter field2' TYPE 'E'.
ENDIF.
|
|
After error message both input fields are enabled for input. |
After error message all input fields are disabled, only the error field will be enables and heightened . |
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