Hi,
at selection screen------when user enters the values in the feilds of the selection screen and clicks on execution button,this event gets triggered.this event is basically for checking the value entered by the user for the feild of the selection screen i.e data validity checking.this event is for entire selection screen.
at selection screen output-----
This event is executed at PBO of the selection screen every time the user presses
ENTER - in contrast to INITIALIZATION . Therefore, this event is not suitable for setting selection screen default values.
Also, since AT SELECTION-SCREEN OUTPUT is first executed after the variant is imported (if a variant is used)
and after adopting any values specified under SUBMIT in the WITH clause, changing the report parameters
or the selection options in AT SELECTION-SCREEN OUTPUT would destroy the specified values.
Here, however, you can use LOOP AT SCREEN or MODIFY SCREEN to change the input/output attributes of selection screen fields.
Example
Output all fields of the SELECT-OPTION NAME highlighted:
******************************************************
SELECT-OPTIONS NAME FOR SY-REPID MODIF ID XYZ.
....
AT SELECTION-SCREEN OUTPUT.
LOOP AT SCREEN.
CHECK SCREEN-GROUP1 = 'XYZ'.
SCREEN-INTENSIFIED = '1'.
MODIFY SCREEN.
ENDLOOP.
The addition MODIF ID XYZ to the key word SELECT-OPTIONS
assigns all fields of the selection option NAME to a group you can read in the field SCREEN-GROUP1 .
At PBO of the selection screen, all these fields are then set to highlighted.
***************************************************
AT SELECTION_SCREEN OUTPUT
LOOP AT SCREEN.
if VIEW = 'X' " View radio button selects
IF SCREEN-NAME = 'PR1'.
screen-INPUT = 0.
modify screen.
ENDIF.
IF SCREEN-NAME = 'PR2'.
screen-INPUT = 0.
modify screen.
ENDIF.
ENDLOOP.
AT SELECTION-SCREEN.
*val....1 Variant check
Once the user has entered variant, check about its existence
PERFORM CHECK_PVAR. "Using FM REUSE_ALV_VARIANT_EXISTENCE
*val....2 Sd do not exists
SELECT SINGLE VBELN INTO WA_HEADER-VBELN FROM VBAK WHERE VBELN IN
S_VBELN.
IF SY-SUBRC 0.
MESSAGE E010 WITH TEXT-010.
ENDIF.
*val.....3 Date of creation check
LOOP AT S_DOC.
IF S_DOC-LOW > SY-DATUM OR S_DOC-HIGH > SY-DATUM.
MESSAGE E011 WITH TEXT-011.
ENDIF.
ENDLOOP.
*VAL....4
if P_DOWN = 'X' AND P_PATH is initial.
MESSAGE E011 WITH TEXT-011.
endif.
if P_DW_RP = 'X' AND P_path is initial.
MESSAGE E011 WITH TEXT-011.
endif.
***********************************************
at selection-screen output.
if c1 = 'X'.
LOOP AT SCREEN.
CASE SCREEN-NAME.
WHEN 'P1'.
SCREEN-ACTIVE = '0'. 'HERE I AM DISABLING FIRST PARAMETER (P1 IS A PARAMETER NAME)
MODIFY SCREEN.
ENDCASE.
ENDLOOP.
if c2 = 'X'.
LOOP AT SCREEN.
CASE SCREEN-NAME.
WHEN 'P2'.
SCREEN-ACTIVE = '0'.'HERE I AM DISABLING SECOND PARAMETER
MODIFY SCREEN.
ENDCASE.
ENDLOOP.
***************************************************************
REPORT DEMO.
PARAMETERS: TEST1(10) MODIF ID SC1,
TEST2(10) MODIF ID SC2,
TEST3(10) MODIF ID SC1,
TEST4(10) MODIF ID SC2.
AT SELECTION-SCREEN OUTPUT.
LOOP AT SCREEN.
IF SCREEN-GROUP1 = 'SC1'.
SCREEN-INTENSIFIED = '1'.
MODIFY SCREEN.
CONTINUE.
ENDIF.
IF SCREEN-GROUP1 = 'SC2'.
SCREEN-INTENSIFIED = '0'.
MODIFY SCREEN.
ENDIF.
ENDLOOP.
At selection-screen output is used to change the properties of selection screen fields...
Loop at screen - where screen is a default structure maintained by SAP...which contains many fields like the below field...each serves a purpose using which we can change the properties of selection screen fields.....
NAME
GROUP1
GROUP2
GROUP3
GROUP4
REQUIRED
INPUT
OUTPUT
INTENSIFIED
INVISIBLE
LENGTH
ACTIVE
DISPLAY_3D
VALUE_HELP
REQUEST
VALUES_IN_COMBO
COLOR
Regards,
Raj.
Bluesky
