How to create an editable ALV?

Question

How to create an editable ALV?

Answer 1

The follow program demonstrates how to make individual fields of an ALV grid editable (NetPR greater than 10).
Changes required from a basic ALV grid include adding a new field to ALV grid data table(it_ekko), Populating this
field with style attribute and adding an entry to layout control table. Also from the previous examples used on
this website you will also need to change the data type of the fieldcatalog, the layout and use a different function
module for displaying the report.
*& Report  ZDEMO_ALVGRID_EDIT                                          *
*& Example of a simple ALV Grid Report                                 *
*& The basic ALV grid, Enhanced to display specific fields as          *
*& editable depending on field value                                   *
REPORT  ZDEMO_ALVGRID_EDIT                 .
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,
  field_style  TYPE lvc_t_styl, "FOR DISABLE
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.
DATA: it_fieldcat TYPE lvc_t_fcat,     "slis_t_fieldcat_alv WITH HEADER LINE,
      wa_fieldcat TYPE lvc_s_fcat,
      gd_tab_group TYPE slis_t_sp_group_alv,
      gd_layout    TYPE lvc_s_layo,     "slis_layout_alv,
      gd_repid     LIKE sy-repid.
*Start-of-selection.
START-OF-SELECTION.
  PERFORM data_retrieval.
  PERFORM set_specific_field_attributes.
  PERFORM build_fieldcatalog.
  PERFORM build_layout.
  PERFORM display_alv_report.
*&      Form  BUILD_FIELDCATALOG
      Build Fieldcatalog for ALV Report
FORM build_fieldcatalog.
  wa_fieldcat-fieldname   = 'EBELN'.
  wa_fieldcat-scrtext_m   = 'Purchase Order'.
  wa_fieldcat-col_pos     = 0.
  wa_fieldcat-outputlen   = 10.
  wa_fieldcat-emphasize   = 'X'.
  wa_fieldcat-key         = 'X'.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR  wa_fieldcat.
  wa_fieldcat-fieldname   = 'EBELP'.
  wa_fieldcat-scrtext_m   = 'PO Item'.
  wa_fieldcat-col_pos     = 1.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR  wa_fieldcat.
  wa_fieldcat-fieldname   = 'STATU'.
  wa_fieldcat-scrtext_m   = 'Status'.
  wa_fieldcat-col_pos     = 2.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR  wa_fieldcat.
  wa_fieldcat-fieldname   = 'AEDAT'.
  wa_fieldcat-scrtext_m   = 'Item change date'.
  wa_fieldcat-col_pos     = 3.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR  wa_fieldcat.
  wa_fieldcat-fieldname   = 'MATNR'.
  wa_fieldcat-scrtext_m   = 'Material Number'.
  wa_fieldcat-col_pos     = 4.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR  wa_fieldcat.
  wa_fieldcat-fieldname   = 'MENGE'.
  wa_fieldcat-scrtext_m   = 'PO quantity'.
  wa_fieldcat-col_pos     = 5.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR  wa_fieldcat.
  wa_fieldcat-fieldname   = 'MEINS'.
  wa_fieldcat-scrtext_m   = 'Order Unit'.
  wa_fieldcat-col_pos     = 6.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR  wa_fieldcat.
  wa_fieldcat-fieldname   = 'NETPR'.
  wa_fieldcat-scrtext_m   = 'Net Price'.
  wa_fieldcat-edit        = 'X'. "sets whole column to be editable
  wa_fieldcat-col_pos     = 7.
  wa_fieldcat-outputlen   = 15.
  wa_fieldcat-datatype     = 'CURR'.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR  wa_fieldcat.
  wa_fieldcat-fieldname   = 'PEINH'.
  wa_fieldcat-scrtext_m   = 'Price Unit'.
  wa_fieldcat-col_pos     = 8.
  APPEND wa_fieldcat TO it_fieldcat.
  CLEAR  wa_fieldcat.
ENDFORM.                    " BUILD_FIELDCATALOG
*&      Form  BUILD_LAYOUT
      Build layout for ALV grid report
FORM build_layout.
Set layout field for field attributes(i.e. input/output)
  gd_layout-stylefname = 'FIELD_STYLE'.
  gd_layout-zebra             = 'X'.
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'
  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY_LVC'
       EXPORTING
            i_callback_program      = gd_repid
           i_callback_user_command = 'USER_COMMAND'
            is_layout_lvc               = gd_layout
            it_fieldcat_lvc             = it_fieldcat
            i_save                  = 'X'
       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  CORRESPONDING FIELDS OF TABLE it_ekko.
ENDFORM.                    " DATA_RETRIEVAL
*&      Form  set_specific_field_attributes
      populate FIELD_STYLE table with specific field attributes
form set_specific_field_attributes .
  DATA ls_stylerow TYPE lvc_s_styl .
  DATA lt_styletab TYPE lvc_t_styl .
Populate style variable (FIELD_STYLE) with style properties
The NETPR field/column has been set to editable in the fieldcatalog...
The following code sets it to be disabled(display only) if 'NETPR'
is gt than 10.
  LOOP AT it_ekko INTO wa_ekko.
    IF wa_ekko-netpr GT 10.
      ls_stylerow-fieldname = 'NETPR' .
      ls_stylerow-style = cl_gui_alv_grid=>mc_style_disabled.
                                             "set field to disabled
      APPEND ls_stylerow  TO wa_ekko-field_style.
      MODIFY it_ekko FROM wa_ekko.
    ENDIF.
  ENDLOOP.
endform.                    " set_specific_field_attributes