Refreshing alv but how?

Question

while using alv, how can we refresh it?
if it is not first display then of course will be refreshed but how, I do not know.
Anyone that can help me?
How it is understood that it is refreshed?
When clicked a tool or button?
Thanks in advance.
Deniz.

Answer 1

See The example COde :
REPORT Z_GET_REFRESH no standard page heading.
type-pools : slis.
tables : makt,
         mara.
data : i_fieldcat type slis_t_fieldcat_alv.
CONSTANTS :
  gc_refresh TYPE syucomm VALUE '&REFRESH'.
data : begin of i_makt occurs 0,
       matnr like makt-matnr,
       maktx like makt-maktx,
       end of i_makt.
data : v_repid like sy-repid,
       g_user_command type slis_formname value 'USER_COMMAND',
       g_status_set   type slis_formname value 'SET_PF_STATUS',
        lt_event_exit TYPE slis_t_event_exit,
        ls_event_exit TYPE slis_event_exit.
DATA:LC_GLAY TYPE LVC_S_GLAY.
select-options s_matnr for mara-matnr .
start-of-selection.
  select matnr maktx from makt into table i_makt
                              where matnr in s_matnr.
end-of-selection.
Fill the fieldcatlog
  perform fill_field.
Call the FM
  perform call_fm.
*&      Form  fill_field
      text
-->  p1        text
<--  p2        text
FORM fill_field.
  data wa_fieldcat type slis_fieldcat_alv.
  clear : wa_fieldcat.
  wa_fieldcat-tabname = 'I_MAKT'.
  wa_fieldcat-fieldname = 'MATNR'.
  wa_fieldcat-outputlen = '18'.
  wa_fieldcat-seltext_l = 'Material #'.
  wa_fieldcat-col_pos = '1'.
  append wa_fieldcat to i_fieldcat.
  clear : wa_fieldcat.
  wa_fieldcat-tabname = 'I_MAKT'.
  wa_fieldcat-fieldname = 'MAKTX'.
  wa_fieldcat-outputlen = '40'.
  wa_fieldcat-seltext_l = 'Material Desc'.
  wa_fieldcat-col_pos = '2'.
  append wa_fieldcat to i_fieldcat.
ENDFORM.                    " fill_field
*&      Form  call_fm
      text
-->  p1        text
<--  p2        text
FORM call_fm.
  v_repid = sy-repid.
  LC_GLAY-EDT_CLL_CB = 'X'.
  CLEAR ls_event_exit.
  ls_event_exit-ucomm = gc_refresh.    " Refresh
  ls_event_exit-after = 'X'.
  APPEND ls_event_exit TO lt_event_exit.
  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
   EXPORTING
  I_INTERFACE_CHECK                 = ' '
  I_BYPASSING_BUFFER                =
  I_BUFFER_ACTIVE                   = ' '
      I_CALLBACK_PROGRAM                = v_repid
      I_CALLBACK_PF_STATUS_SET          = g_status_set
      I_CALLBACK_USER_COMMAND           = g_user_command
  I_CALLBACK_TOP_OF_PAGE            = ' '
  I_CALLBACK_HTML_TOP_OF_PAGE       = ' '
  I_CALLBACK_HTML_END_OF_LIST       = ' '
  I_STRUCTURE_NAME                  =
  I_BACKGROUND_ID                   = ' '
  I_GRID_TITLE                      =
    I_GRID_SETTINGS                   = LC_GLAY
  IS_LAYOUT                         =
      IT_FIELDCAT                       = i_fieldcat
  IT_EXCLUDING                      =
  IT_SPECIAL_GROUPS                 =
  IT_SORT                           =
  IT_FILTER                         =
  IS_SEL_HIDE                       =
  I_DEFAULT                         = 'X'
  I_SAVE                            = ' '
  IS_VARIANT                        =
  IT_EVENTS                         =
   IT_EVENT_EXIT                     = lt_event_exit
  IS_PRINT                          =
  IS_REPREP_ID                      =
  I_SCREEN_START_COLUMN             = 0
  I_SCREEN_START_LINE               = 0
  I_SCREEN_END_COLUMN               = 0
  I_SCREEN_END_LINE                 = 0
  IT_ALV_GRAPHICS                   =
  IT_ADD_FIELDCAT                   =
  IT_HYPERLINK                      =
  I_HTML_HEIGHT_TOP                 =
  I_HTML_HEIGHT_END                 =
  IT_EXCEPT_QINFO                   =
IMPORTING
  E_EXIT_CAUSED_BY_CALLER           =
  ES_EXIT_CAUSED_BY_USER            =
    TABLES
      T_OUTTAB                          = i_makt
   EXCEPTIONS
     PROGRAM_ERROR                     = 1
     OTHERS                            = 2
  IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
  ENDIF.
ENDFORM.                    " call_fm
      FORM USER_COMMAND                                             *
FORM user_command USING r_ucomm LIKE sy-ucomm
            rs_selfield TYPE slis_selfield.                 "#EC CALLED
  data i_RSPARAMS like RSPARAMS occurs 0.
  CASE R_UCOMM.
    WHEN '&IC1'.
      read table i_makt index rs_selfield-tabindex.
      SET PARAMETER ID 'MAT' FIELD i_makt-matnr.
      if not i_makt-matnr is initial.
        call transaction 'MM02' and skip first screen.
      endif.
    when '&REFRESH'.
      CALL FUNCTION 'RS_REFRESH_FROM_SELECTOPTIONS'
        EXPORTING
          CURR_REPORT           = v_repid
IMPORTING
  SP                    =
        TABLES
         SELECTION_TABLE       = i_RSPARAMS
       EXCEPTIONS
         NOT_FOUND             = 1
         NO_REPORT             = 2
         OTHERS                = 3
      IF SY-SUBRC <> 0.
MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
        WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
      ENDIF.
      submit z_get_refresh with selection-table i_RSPARAMS.
      rs_selfield-refresh = 'X'.
  ENDCASE.
  MOVE '&REFRESH' TO r_ucomm.
ENDFORM.
      FORM set_pf_status                                            *
FORM SET_PF_STATUS USING rt_extab TYPE slis_t_extab.
DELETE Rt_extab WHERE fcode = gc_refresh.
  SET PF-STATUS 'STANDARD_FULLSCREEN' OF PROGRAM 'SAPLKKBL'
      EXCLUDING Rt_extab.
*SET PF-STATUS 'STANDARD' EXCLUDING rt_extab.
  SET TITLEBAR  sy-tcode.
ENDFORM.
Reward Points if it is helpful
Thanks
Seshu