Oops ALV in background mode

Question

Hi Experts,
I know this topic is discussed several times but I still have a confusion.
I have created one ALV report using custom container like the usual way. As per my understanding this report shouldn't execute in background
but when I execute the report in background in development system, it's not throwing any error and I am able to get the spool.
Why is this happening? Is there a possibility that if I transport the object to other system I may get error?
Please share your thoughts.
Thanks,
Tiki

Answer 1

This is my "common code" i use to manage CL_GUI_GRID in background without touching the output screen to define a container
CLASS lcl_event_handler DEFINITION DEFERRED.
DATA: gr_event_handler      TYPE REF TO lcl_event_handler.
*---- ALV Grid instance reference
DATA: gr_alvgrid            TYPE REF TO cl_gui_alv_grid.
*---- Custom container instance reference
DATA: gr_splitter_container TYPE REF TO cl_gui_splitter_container,
       gr_container          TYPE REF TO cl_gui_container.
*---- Header container
DATA: gr_docking_container  TYPE REF TO cl_gui_docking_container,
       gr_document           TYPE REF TO cl_dd_document.
IN PBO
IF sy-batch = 'X'.
*---- Creating ALV grid within a docking container
       CREATE OBJECT gr_alvgrid
         EXPORTING
           i_parent = gr_docking_container.
     ELSE.
*---- Creating Splitted Containers
       CREATE OBJECT gr_splitter_container
         EXPORTING
           parent  = cl_gui_container=>screen0
           rows    = 1
           columns = 1.
       CALL METHOD gr_splitter_container->set_border
         EXPORTING
           border = cl_gui_cfw=>false.
       CALL METHOD gr_splitter_container->set_row_mode
         EXPORTING
           mode = gr_splitter_container->mode_relative.
       gr_container =
         gr_splitter_container->get_container( row = 1 column = 1 ).
*---- Creating ALV Grid instance
       CREATE OBJECT gr_alvgrid
         EXPORTING
           i_parent = gr_container.
*---- Preparing document header
       PERFORM prepare_header.
     ENDIF.
*-- Creating an instance for the event handler
     CREATE OBJECT gr_event_handler.
*-- Registering handler methods to handle ALV Grid events
*   NOTA: Qua vanno registrati eventuali metodi aggiunti per gestire
*   altri eventi della classe CL_GUI_ALV_GRID.
     SET HANDLER gr_event_handler->handle_double_click  FOR gr_alvgrid.
     SET HANDLER gr_event_handler->handle_hotspot_click FOR gr_alvgrid.
     SET HANDLER gr_event_handler->handle_data_changed  FOR gr_alvgrid.
     SET HANDLER gr_event_handler->handle_data_changed_finished
                                                        FOR gr_alvgrid.
     SET HANDLER gr_event_handler->handle_toolbar       FOR gr_alvgrid.
     SET HANDLER gr_event_handler->handle_user_command  FOR gr_alvgrid.
*-- Preparing layout structure
     PERFORM prepare_layout.
*-- Preparing print structure
     PERFORM prepare_print.
*-- Preparing field catalog
     PERFORM prepare_field_catalog.
*-- Preparing sort criteria table
     PERFORM prepare_sort_criteria.
*-- Prepating filter criteria table
     PERFORM prepare_filter_criteria.
*-- Preparing function codes to exclude from the toolbar
     PERFORM prepare_toolbar_exclude.
*-- Preparing the output for the ALV grid list
*-- NOTE: set I_BUFFER_ACTIVE = 'X' to speed to the list display
*-- if the ALV grid uses statically always the same field catalog
     CALL METHOD gr_alvgrid->set_table_for_first_display
       EXPORTING
*       i_buffer_active               = 'X'
*       i_structure_name              = 'GS_OUTTAB'
         is_variant                    = gs_variant
         i_save                        = 'A'
         i_default                     = 'X'
         is_layout                     = gs_layout
         is_print                      = gs_print
*       IT_SPECIAL_GROUPS             =
         it_toolbar_excluding          = gt_exclude[]
*       IT_HYPERLINK                  =
*       IT_ALV_GRAPHICS               =
       CHANGING
         it_outtab                     = gt_outtab[]
         it_fieldcatalog               = gt_fieldcat[]
         it_sort                       = gt_sort[]
         it_filter                     = gt_filter[]
       EXCEPTIONS
         invalid_parameter_combination = 1
         program_error                 = 2
         too_many_lines                = 3
         OTHERS                        = 4.
*-- Allows to edit the toolbar
     CALL METHOD gr_alvgrid->set_toolbar_interactive.