In this example I’ll show how to add a column which will hold a user defined icon to the ALV grid. The core is:

1. Add new field to the output table gt_data (this will hold the icon information)
2. Modify the field catalog gt_fieldcat so it’s updated with info about our new field and set this new field as icon
3. Read and prepare data for output (read data from DB and update the icon field based on your criteria)
4. Display or refresh our ALV grid (g_grid->set_table_for_first_display) using the modified field catalog

1. Data definition

Here we create the output table with field ICON – this will be used to store the icon name.

TYPES: BEGIN OF ty_data.
        INCLUDE STRUCTURE sflight.
TYPES:  icon(4) TYPE c,             " field to hold the icon
       END OF ty_data.

DATA: gt_data TYPE TABLE OF ty_data,
      g_grid TYPE REF TO cl_gui_alv_grid,
      gs_layout TYPE lvc_s_layo,
      gt_fieldcat TYPE lvc_t_fcat.

2. Field catalog

Now we prepare field catalog for data structure we’re going to use and update it with the new ICON field

FORM get_fieldcat .
  FIELD-SYMBOLS: <fs_fcat> TYPE lvc_s_fcat.

  CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
    EXPORTING
      i_structure_name       = 'SFLIGHT'
    CHANGING
      ct_fieldcat            = gt_fieldcat
    EXCEPTIONS
      inconsistent_interface = 1
      program_error          = 2
      OTHERS                 = 3.
  CHECK sy-subrc = 0.

  APPEND INITIAL LINE TO gt_fieldcat ASSIGNING <fs_fcat>.
  <fs_fcat>-fieldname = 'ICON'.
  <fs_fcat>-icon = 'X'.
  <fs_fcat>-outputlen = 3.
ENDFORM.

3. Read data

In our example we would like to add “warning” icon when some of the travel classes is full (see the line <fs_data>-icon = '@AH@'.)

FORM read_data.
  DATA:
    l_color TYPE c.

  FIELD-SYMBOLS:
    <fs_data> TYPE ty_data.

  SELECT * INTO CORRESPONDING FIELDS OF TABLE gt_data
    FROM sflight
    UP TO c_max_rows ROWS.

  LOOP AT gt_data ASSIGNING <fs_data>.
    IF <fs_data>-seatsocc = <fs_data>-seatsmax OR
       <fs_data>-seatsocc_b = <fs_data>-seatsmax_b OR
      <fs_data>-seatsocc_f = <fs_data>-seatsmax_f.
      " Some class is full
      <fs_data>-icon = '@AH@'.             " Warning Icon
    ENDIF.
  ENDLOOP.
ENDFORM.

Together with field catalog we modified the ALV grid layout to display lines in “zebra” style

FORM get_layout .
  gs_layout-zebra = 'X'.
ENDFORM.

4. Display data

Now we display our data with new field containing a warning icon in case some of the travel classes is full

FORM display_grid.
  PERFORM get_layout.
  PERFORM get_fieldcat.

  CREATE OBJECT g_grid
    EXPORTING
      i_parent = cl_gui_container=>default_screen.

  CALL METHOD g_grid->set_table_for_first_display
    EXPORTING
      i_structure_name              = 'SFLIGHT'
      is_layout                     = gs_layout
    CHANGING
      it_outtab                     = gt_data
      it_fieldcatalog               = gt_fieldcat
    EXCEPTIONS
      invalid_parameter_combination = 1
      program_error                 = 2
      too_many_lines                = 3
      OTHERS                        = 4.
  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.

The report output should now look like on the picture below