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How to Create Popup Help
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This example was done mostly from memory, not in the ABAP editor, so it probably will not compile, it is only to show how to call the functions used here.
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Source Code Listing
*-- F4 help for Payroll Administrator
AT SELECTION SCREEN ON VALUE REQUEST FOR P_SACHA.
PERFORM VALUES_SACHA.
*-- F4 help for Pay Scale Group
AT SELECTION SCREEN ON VALUE REQUEST FOR P_TRFGR.
*-- F4 help for Pay Scale Level
AT SELECTION SCREEN ON VALUE REQUEST FOR P_TRFST.
*---------------------------------------------------------------------*
* FORM VALUES_SACHA
*---------------------------------------------------------------------*
* Provide popup help for the Payroll Admin field
*---------------------------------------------------------------------*
FORM VALUES_SACHA.
REFRESH: LTAB_DYNPSELECT,
LTAB_DYNPVALUETAB.
PERFORM READ_VALUE_FROM_SCREEN USING SY-REPID
SY-DYNNR
'PA0001-WERKS'
CHANGING LTAB_DYNPSELECT-FLDNAME
LTAB_DYNPSELECT-FLDINH.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'MANDT'.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'SACHX'.
APPEND LTAB_DYNPSELECT.
PERFORM SHOW_HELP TABLES LTAB_DYNPSELECT
LTAB_DYNPVALUETAB
USING 'T526'
'SACHX'
CHANGING PA0001-SACHA.
ENDFORM. " VALUES_SACHA
*---------------------------------------------------------------------*
* FORM VALUES_TRFGR
*---------------------------------------------------------------------*
* Provide popup help for Pay Scale Group
*---------------------------------------------------------------------*
FORM VALUES_TRFGR.
REFRESH: LTAB_DYNPSELECT,
LTAB_DYNPVALUETAB.
LTAB_DYNPSELECT-FLDNAME = 'MANDT'.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'MOLGA'.
SELECT SINGLE MOLGA FROM T001P
INTO LTAB_DYNPSELECT-FLDINH
WHERE WERKS = *PA0001-WERKS
AND BTRTL = *PA0001-BTRTL.
IF SY-SUBRC NE 0.
LTAB_DYNPSELECT-FLDINH = SPACE.
ENDIF.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFAR'.
LTAB_DYNPSELECT-FLDINH = *PA0008-TRFAR.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFGB'.
LTAB_DYNPSELECT-FLDINH = *PA0008-TRFGB.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFKZ'.
SELECT SINGLE TRFKZ FROM T503
INTO LTAB_DYNPSELECT-FLDINH
WHERE PERSG = *PA0001-PERSG
AND PERSK = *PA0001-PERSK.
IF SY-SUBRC NE 0.
LTAB_DYNPSELECT-FLDINH = SPACE.
ENDIF.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFGR'.
LTAB_DYNPSELECT-FLDINH = SPACE.
APPEND LTAB_DYNPSELECT.
PERFORM SHOW_HELP TABLES LTAB_DYNPSELECT
LTAB_DYNPVALUETAB
USING 'T510'
'TRFGR'
CHANGING PA0008-TRFGR.
PERFORM UPDATE_VALUE_ON_SCREEN USING SY-REPID
SY-DYNNR
'PA0008-TRFGR'
PA0008-TRFGR.
ENDFORM. " VALUES_TRFGR
*---------------------------------------------------------------------*
* FORM VALUES_TRFST
*---------------------------------------------------------------------*
* Provide popup help for Pay Scale Area
*---------------------------------------------------------------------*
FORM VALUES_TRFST.
REFRESH: LTAB_DYNPSELECT,
LTAB_DYNPVALUETAB.
LTAB_DYNPSELECT-FLDNAME = 'MANDT'.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'MOLGA'.
SELECT SINGLE MOLGA FROM T001P
INTO LTAB_DYNPSELECT-FLDINH
WHERE WERKS = *PA0001-WERKS
AND BTRTL = *PA0001-BTRTL.
IF SY-SUBRC NE 0.
LTAB_DYNPSELECT-FLDINH = SPACE.
ENDIF.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFAR'.
LTAB_DYNPSELECT-FLDINH = *PA0008-TRFAR.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFGB'.
LTAB_DYNPSELECT-FLDINH = *PA0008-TRFGB.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFKZ'.
SELECT SINGLE TRFKZ FROM T503
INTO LTAB_DYNPSELECT-FLDINH
WHERE PERSG = *PA0001-PERSG
AND PERSK = *PA0001-PERSK.
IF SY-SUBRC NE 0.
LTAB_DYNPSELECT-FLDINH = SPACE.
ENDIF.
APPEND LTAB_DYNPSELECT.
PERFORM READ_VALUE_FROM_SCREEN USING SY-REPID
SY-DYNNR
'PA0008-TRFGR'
CHANGING LTAB_DYNPSELECT-FLDNAME
LTAB_DYNPSELECT-FLDINH.
APPEND LTAB_DYNPSELECT.
LTAB_DYNPSELECT-FLDNAME = 'TRFST'.
LTAB_DYNPSELECT-FLDINH = SPACE.
APPEND LTAB_DYNPSELECT.
PERFORM SHOW_HELP TABLES LTAB_DYNPSELECT
LTAB_DYNPVALUETAB
USING 'T510'
'TRFST'
CHANGING PA0008-TRFST.
PERFORM UPDATE_VALUE_ON_SCREEN USING SY-REPID
SY-DYNNR
'PA0008-TRFST'
PA0008-TRFST.
ENDFORM. " VALUES_TRFST
*---------------------------------------------------------------------*
* FORM SHOW_HELP *
*---------------------------------------------------------------------*
* ........ *
*---------------------------------------------------------------------*
* --> FTAB_DYNPSELECT *
* --> FTAB_DYNPVALUETAB *
* --> FSTR_HELP_INFO *
* --> F_NEWVALUE *
*---------------------------------------------------------------------*
FORM SHOW_HELP TABLES FTAB_DYNPSELECT STRUCTURE DSELC
FTAB_DYNPVALUETAB STRUCTURE DVAL
USING F_CHECKTABLE LIKE HELP_INFO-CHECKTABLE
F_CHECKFIELD LIKE HELP_INFO-CHECKFIELD
CHANGING F_NEWVALUE.
DATA: LSTR_HELP_INFO LIKE HELP_INFO.
DATA: LC_SELECTION_VALUE LIKE HELP_INFO-FLDVALUE.
DATA: LC_SELECTION(1) TYPE C.
*-- Fill in fields required for help function call
LSTR_HELP_INFO-CALL = 'T'.
LSTR_HELP_INFO-OBJECT = 'F'.
LSTR_HELP_INFO-SPRAS = SY-LANGU.
LSTR_HELP_INFO-CHECKTABLE = F_CHECKTABLE.
LSTR_HELP_INFO-CHECKFIELD = F_CHECKFIELD.
CALL FUNCTION 'HELP_START'
EXPORTING
HELP_INFOS = LSTR_HELP_INFO
IMPORTING
SELECTION = LC_SELECTION
SELECT_VALUE = LC_SELECTION_VALUE
TABLES
DYNPSELECT = FTAB_DYNPSELECT
DYNPVALUETAB = FTAB_DYNPVALUETAB
EXCEPTIONS
OTHERS = 1.
IF LC_SELECTION NE SPACE AND SY-SUBRC = 0.
F_NEWVALUE = LC_SELECTION_VALUE.
ENDIF.
ENDFORM. " SHOW_HELP
*---------------------------------------------------------------------*
* FORM READ_VALUE_FROM_SCREEN *
*---------------------------------------------------------------------*
* ........ *
*---------------------------------------------------------------------*
* --> F_REPID *
* --> F_DYNNR *
* --> VALUE(F_FIELDNAME_IN) *
* --> F_FIELDNAME_OUT *
* --> F_FIELDVALUE *
*---------------------------------------------------------------------*
FORM READ_VALUE_FROM_SCREEN USING F_REPID
F_DYNNR
VALUE(F_FIELDNAME_IN)
CHANGING F_FIELDNAME_OUT
F_FIELDVALUE.
DATA: LTAB_FIELDS LIKE DYNPREAD OCCURS 0 WITH HEADER LINE.
DATA: LC_DYNAME LIKE SY-REPID.
DATA: LC_DYNUMB LIKE SY-DYNNR.
DATA: LC_DUMMY(1) TYPE C.
*-- Read the screen to see if the user has entered a value for WERKS
LTAB_FIELDS-FIELDNAME = F_FIELDNAME_IN.
append ltab_fields.
LC_DYNAME = F_REPID.
LC_DYNUMB = F_DYNNR.
CALL FUNCTION 'DYNP_VALUES_READ'
EXPORTING
DYNAME = LC_DYNAME
DYNUMB = LC_DYNUMB
TABLES
dynpfields = ltab_fields
EXCEPTIONS
OTHERS = 01.
read table ltab_fields index 1.
*-- Return the value from the screen
IF SY-SUBRC EQ 0.
SPLIT LTAB_FIELDS-FIELDNAME AT '-'
INTO LC_DUMMY
F_FIELDNAME_OUT.
F_FIELDVALUE = LTAB_FIELDS-FIELDVALUE.
ENDIF.
ENDFORM. " READ_VALUE_FROM_SCREEN
*---------------------------------------------------------------------*
* FORM UPDATE_VALUE_ON_SCREEN *
*---------------------------------------------------------------------*
* The PROCESS ON VALUE-REQUEST does not always return blanks. *
* If a blank value is to be returned, this routine must be *
* called.
*---------------------------------------------------------------------*
* --> F_REPID *
* --> F_DYNNR *
* --> VALUE(F_FIELDNAME) *
* --> F_FIELDVALUE *
*---------------------------------------------------------------------*
FORM UPDATE_VALUE_ON_SCREEN USING F_REPID
F_DYNNR
VALUE(F_FIELDNAME)
F_FIELDVALUE.
DATA: LTAB_FIELDS LIKE DYNPREAD OCCURS 0 WITH HEADER LINE.
DATA: LC_DYNAME LIKE SY-REPID.
DATA: LC_DYNUMB LIKE SY-DYNNR.
LC_DYNAME = SY-REPID.
LC_DYNUMB = SY-DYNNR.
LTAB_FIELDS-FIELDNAME = F_FIELDNAME.
LTAB_FIELDS-FIELDVALUE = F_FIELDVALUE.
APPEND LTAB_FIELDS.
CALL FUNCTION 'DYNP_VALUES_UPDATE'
EXPORTING
DYNAME = LC_DYNAME
DYNUMB = LC_DYNUMB
TABLES
DYNPFIELDS = LTAB_FIELDS
EXCEPTIONS
OTHERS = 8.
ENDFORM. " UPDATE_VALUE_ON_SCREEN
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