Select columns from table for display in alvgrid.

Question

Hi all,
i have the following:
i do select a tablename and pass it as a parameter. then this table is loaded into an internal table and displayed in an alv-grid.
what i now want to do is a step  between the both:
after the internal table with its structure is loaded, i want to display the field columns and i want them to be selectable so that in the next step the alv - grid is selected only with the selected columns ( just now it allways runs with all columns - even the not needed ).
Any ideas for that would be appreciated. Is there some tutorial on that or some sample ?

Answer 1

hi
chk this sample code:
*REPORT  zdemo_alvgrid                 .
TABLES:     ekko.
type-pools: slis.                                 "ALV Declarations
*Data Declaration
TYPES: BEGIN OF t_ekko,
  ebeln TYPE ekpo-ebeln,
  ebelp TYPE ekpo-ebelp,
  statu TYPE ekpo-statu,
  aedat TYPE ekpo-aedat,
  matnr TYPE ekpo-matnr,
  menge TYPE ekpo-menge,
  meins TYPE ekpo-meins,
  netpr TYPE ekpo-netpr,
  peinh TYPE ekpo-peinh,
END OF t_ekko.
DATA: it_ekko TYPE STANDARD TABLE OF t_ekko INITIAL SIZE 0,
      wa_ekko TYPE t_ekko.
*ALV data declarations
data: fieldcatalog type slis_t_fieldcat_alv with header line,
      gd_tab_group type slis_t_sp_group_alv,
      gd_layout    type slis_layout_alv,
      gd_repid     like sy-repid,
      gt_events     type slis_t_event,
      gd_prntparams type slis_print_alv.
*Start-of-selection.
START-OF-SELECTION.
perform data_retrieval.
perform build_fieldcatalog.
perform build_layout.
perform build_events.
perform build_print_params.
perform display_alv_report.
*&      Form  BUILD_FIELDCATALOG
      Build Fieldcatalog for ALV Report
form build_fieldcatalog.
There are a number of ways to create a fieldcat.
For the purpose of this example i will build the fieldcatalog manualy
by populating the internal table fields individually and then
appending the rows. This method can be the most time consuming but can
also allow you  more control of the final product.
Beware though, you need to ensure that all fields required are
populated. When using some of functionality available via ALV, such as
total. You may need to provide more information than if you were
simply displaying the result
              I.e. Field type may be required in-order for
                   the 'TOTAL' function to work.
  fieldcatalog-fieldname   = 'EBELN'.
  fieldcatalog-seltext_m   = 'Purchase Order'.
  fieldcatalog-col_pos     = 0.
  fieldcatalog-outputlen   = 10.
  fieldcatalog-emphasize   = 'X'.
  fieldcatalog-key         = 'X'.
fieldcatalog-do_sum      = 'X'.
fieldcatalog-no_zero     = 'X'.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'EBELP'.
  fieldcatalog-seltext_m   = 'PO Item'.
  fieldcatalog-col_pos     = 1.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'STATU'.
  fieldcatalog-seltext_m   = 'Status'.
  fieldcatalog-col_pos     = 2.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'AEDAT'.
  fieldcatalog-seltext_m   = 'Item change date'.
  fieldcatalog-col_pos     = 3.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'MATNR'.
  fieldcatalog-seltext_m   = 'Material Number'.
  fieldcatalog-col_pos     = 4.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'MENGE'.
  fieldcatalog-seltext_m   = 'PO quantity'.
  fieldcatalog-col_pos     = 5.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'MEINS'.
  fieldcatalog-seltext_m   = 'Order Unit'.
  fieldcatalog-col_pos     = 6.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'NETPR'.
  fieldcatalog-seltext_m   = 'Net Price'.
  fieldcatalog-col_pos     = 7.
  fieldcatalog-outputlen   = 15.
  fieldcatalog-datatype     = 'CURR'.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
  fieldcatalog-fieldname   = 'PEINH'.
  fieldcatalog-seltext_m   = 'Price Unit'.
  fieldcatalog-col_pos     = 8.
  append fieldcatalog to fieldcatalog.
  clear  fieldcatalog.
endform.                    " BUILD_FIELDCATALOG
*&      Form  BUILD_LAYOUT
      Build layout for ALV grid report
form build_layout.
  gd_layout-no_input          = 'X'.
  gd_layout-colwidth_optimize = 'X'.
  gd_layout-totals_text       = 'Totals'(201).
gd_layout-totals_only        = 'X'.
gd_layout-f2code            = 'DISP'.  "Sets fcode for when double
                                        "click(press f2)
gd_layout-zebra             = 'X'.
gd_layout-group_change_edit = 'X'.
gd_layout-header_text       = 'helllllo'.
endform.                    " BUILD_LAYOUT
*&      Form  DISPLAY_ALV_REPORT
      Display report using ALV grid
form display_alv_report.
  gd_repid = sy-repid.
  call function 'REUSE_ALV_GRID_DISPLAY'
       exporting
            i_callback_program      = gd_repid
            i_callback_top_of_page   = 'TOP-OF-PAGE'  "see FORM
            i_callback_user_command = 'USER_COMMAND'
           i_grid_title           = outtext
            is_layout               = gd_layout
            it_fieldcat             = fieldcatalog[]
           it_special_groups       = gd_tabgroup
            it_events               = gt_events
            is_print                = gd_prntparams
            i_save                  = 'X'
           is_variant              = z_template
       tables
            t_outtab                = it_ekko
       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.                    " DISPLAY_ALV_REPORT
*&      Form  DATA_RETRIEVAL
      Retrieve data form EKPO table and populate itab it_ekko
form data_retrieval.
select ebeln ebelp statu aedat matnr menge meins netpr peinh
up to 10 rows
  from ekpo
  into table it_ekko.
endform.                    " DATA_RETRIEVAL
Form  TOP-OF-PAGE                                                 *
ALV Report Header                                                 *
Form top-of-page.
*ALV Header declarations
data: t_header type slis_t_listheader,
      wa_header type slis_listheader,
      t_line like wa_header-info,
      ld_lines type i,
      ld_linesc(10) type c.
Title
  wa_header-typ  = 'H'.
  wa_header-info = 'EKKO Table Report'.
  append wa_header to t_header.
  clear wa_header.
Date
  wa_header-typ  = 'S'.
  wa_header-key = 'Date: '.
  CONCATENATE  sy-datum+6(2) '.'
               sy-datum+4(2) '.'
               sy-datum(4) INTO wa_header-info.   "todays date
  append wa_header to t_header.
  clear: wa_header.
Total No. of Records Selected
  describe table it_ekko lines ld_lines.
  ld_linesc = ld_lines.
  concatenate 'Total No. of Records Selected: ' ld_linesc
                    into t_line separated by space.
  wa_header-typ  = 'A'.
  wa_header-info = t_line.
  append wa_header to t_header.
  clear: wa_header, t_line.
  call function 'REUSE_ALV_COMMENTARY_WRITE'
       exporting
            it_list_commentary = t_header.
           i_logo             = 'Z_LOGO'.
endform.
      FORM USER_COMMAND                                          *
      --> R_UCOMM                                                *
      --> RS_SELFIELD                                            *
FORM user_command USING r_ucomm LIKE sy-ucomm
                  rs_selfield TYPE slis_selfield.
Check function code
  CASE r_ucomm.
    WHEN '&IC1'.
  Check field clicked on within ALVgrid report
    IF rs_selfield-fieldname = 'EBELN'.
    Read data table, using index of row user clicked on
      READ TABLE it_ekko INTO wa_ekko INDEX rs_selfield-tabindex.
    Set parameter ID for transaction screen field
      SET PARAMETER ID 'BES' FIELD wa_ekko-ebeln.
    Sxecute transaction ME23N, and skip initial data entry screen
      CALL TRANSACTION 'ME23N' AND SKIP FIRST SCREEN.
    ENDIF.
  ENDCASE.
ENDFORM.
*&      Form  BUILD_EVENTS
      Build events table
form build_events.
  data: ls_event type slis_alv_event.
  call function 'REUSE_ALV_EVENTS_GET'
       exporting
            i_list_type = 0
       importing
            et_events   = gt_events[].
  read table gt_events with key name =  slis_ev_end_of_page
                           into ls_event.
  if sy-subrc = 0.
    move 'END_OF_PAGE' to ls_event-form.
    append ls_event to gt_events.
  endif.
    read table gt_events with key name =  slis_ev_end_of_list
                           into ls_event.
  if sy-subrc = 0.
    move 'END_OF_LIST' to ls_event-form.
    append ls_event to gt_events.
  endif.
endform.                    " BUILD_EVENTS
*&      Form  BUILD_PRINT_PARAMS
      Setup print parameters
form build_print_params.
  gd_prntparams-reserve_lines = '3'.   "Lines reserved for footer
  gd_prntparams-no_coverpage = 'X'.
endform.                    " BUILD_PRINT_PARAMS
*&      Form  END_OF_PAGE
form END_OF_PAGE.
  data: listwidth type i,
        ld_pagepos(10) type c,
        ld_page(10)    type c.
  write: sy-uline(50).
  skip.
  write:/40 'Page:', sy-pagno .
endform.
*&      Form  END_OF_LIST
form END_OF_LIST.
  data: listwidth type i,
        ld_pagepos(10) type c,
        ld_page(10)    type c.
  skip.
  write:/40 'Page:', sy-pagno .
endform.
**reward if helpful
regards,
madhu