No ALV output

Question

Hi ALL
my Field Catalogue has been built and i am using the pollowing code on PBO module of screen
  IF g_container IS INITIAL.
    CREATE OBJECT g_container
      EXPORTING
        container_name = 'GRD_CNTRL'
    EXCEPTIONS
        cntl_system_error = 1
        cntl_error = 2
        create_error = 3
        lifetime_error = 4
        lifetime_dynpro_dynpro_link = 5
        OTHERS = 6.
    IF sy-subrc <> 0.
    ENDIF.
    CREATE OBJECT g_alvgrid
      EXPORTING
        i_parent = g_container.
* Set event handler
    SET HANDLER: lcl_eventhandler=>handle_double_click FOR g_alvgrid.
* set layout
    wa_layout-zebra      = 'X'.
    CALL METHOD g_alvgrid->set_table_for_first_display
      EXPORTING
        is_layout                     = wa_layout
      CHANGING
        it_outtab                     = it_out
        it_fieldcatalog               = it_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.
  ENDIF.
sy-subrc = 0 in all instances
I am getting a blanck screen. No Output. Why is that?

Answer 1

This is an example of the entire flow for the PBO of grid init
*       MODULE init_grid_0108 OUTPUT                                  *
MODULE init_grid_0108 OUTPUT.
  PERFORM init_grid_0108.
ENDMODULE.                 " init_grid_0108  OUTPUT
*&      Form  init_grid_0108
FORM init_grid_0108.
  DATA:
* Layout
    wa_layout_action_0108 TYPE lvc_s_layo,
* Field catalog
    it_fcat_action_0108 TYPE lvc_t_fcat.
  IF cust_cont_0108 IS INITIAL.          "CREATE: Yes
*   Create customer container
    CREATE OBJECT cust_cont_0108
      EXPORTING
*        PARENT                      =
         container_name              = 'CUST_CONT_0108'
*        STYLE                       =
*        LIFETIME                    = lifetime_default
*        REPID                       =
*        DYNNR                       =
*        NO_AUTODEF_PROGID_DYNNR     =
       EXCEPTIONS
         cntl_error                  = 1
         cntl_system_error           = 2
         create_error                = 3
         lifetime_error              = 4
         lifetime_dynpro_dynpro_link = 5
         others                      = 6
    IF sy-subrc <> 0.
      MESSAGE e208(00) WITH 'Error: Create Cust Control CUST_CONT'.
    ENDIF.
*   Create grid
    CREATE OBJECT grid_action_0108
      EXPORTING
*        I_SHELLSTYLE      = 0
*        I_LIFETIME        =
         i_parent          = cust_cont_0108
*        I_APPL_EVENTS     = space
*        I_PARENTDBG       =
*        I_APPLOGPARENT    =
*        I_GRAPHICSPARENT  =
*        I_USE_VARIANT_CLASS = SPACE
*        I_NAME            =
       EXCEPTIONS
         error_cntl_create = 1
         error_cntl_init   = 2
         error_cntl_link   = 3
         error_dp_create   = 4
         others            = 5
    IF sy-subrc <> 0.
      MESSAGE e208(00) WITH 'Error: Create Grid GRID_ACTION'.
    ENDIF.
*   Build field catalog
    PERFORM build_fcat_action_0108 CHANGING it_fcat_action_0108.
*   Build layout
    PERFORM build_layout_action_0108 CHANGING wa_layout_action_0108.
*   Display grid (First)
    CALL METHOD grid_action_0108->set_table_for_first_display
       EXPORTING
*        I_BYPASSING_BUFFER            =
*        I_BUFFER_ACTIVE               =
*        I_CONSISTENCY_CHECK           =
*        I_STRUCTURE_NAME              =
*        IS_VARIANT                    =
*        I_SAVE                        =
*        I_DEFAULT                     = 'X'
         is_layout                     = wa_layout_action_0108
*        IS_PRINT                      =
*        IT_SPECIAL_GROUPS             =
*        IT_TOOLBAR_EXCLUDING          =
*        IT_HYPERLINK                  =
*        IT_ALV_GRAPHICS               =
*        IT_EXCEPT_QINFO               =
      CHANGING
         it_outtab                     = wt_zlmcont
         it_fieldcatalog               = it_fcat_action_0108
*        IT_SORT                       =
*        IT_FILTER                     =
*      EXCEPTIONS
*        INVALID_PARAMETER_COMBINATION = 1
*        PROGRAM_ERROR                 = 2
*        TOO_MANY_LINES                = 3
*        others                        = 4
    IF sy-subrc <> 0.
      MESSAGE e208(00) WITH 'Error: Display GRID_ACTION (first)'.
    ENDIF.
    CREATE OBJECT event_receiver_0108.
    SET HANDLER event_receiver_0108->handle_double_click_0108
            FOR grid_action_0108.
  ELSE.                             "CREATE: No
*   ----- Refresh ALV -----
    CALL METHOD grid_action_0108->refresh_table_display
*      EXPORTING
*        IS_STABLE      =
*        I_SOFT_REFRESH =
       EXCEPTIONS
         finished       = 1
         OTHERS         = 2
    IF sy-subrc <> 0.
      MESSAGE e208(00) WITH 'Error: Display GRID_ACTION_0108 (refresh)'.
    ENDIF.
  ENDIF.                            "CREATE
This code is in the Class Defintion.
*       CLASS lcl_event_receiver_0108 DEFINITION
CLASS lcl_event_receiver_0108 DEFINITION DEFERRED.
DATA:
  cust_cont_0108        TYPE REF TO cl_gui_custom_container,
  grid_action_0108      TYPE REF TO cl_gui_alv_grid,
  event_receiver_0108   TYPE REF TO lcl_event_receiver_0108,
  wa_row_no_0108        TYPE lvc_s_roid,
  it_row_no_0108        TYPE lvc_t_roid.
*       CLASS lcl_event_receiver_0108 DEFINITION
CLASS lcl_event_receiver_0108 DEFINITION.
  PUBLIC SECTION.
    METHODS:
    handle_double_click_0108
        FOR EVENT double_click OF cl_gui_alv_grid
            IMPORTING e_row e_column.
  PRIVATE SECTION.
ENDCLASS.
*       CLASS lcl_event_receiver IMPLEMENTATION
CLASS lcl_event_receiver_0108 IMPLEMENTATION.
  METHOD handle_double_click_0108.
* § 4.The event DOUBLE_CLICK provides parameters for row and column
*   of the click. Use row parameter to select a line of the
*   corresponding internal table.
* read selected row from internal table
    READ TABLE wt_zlmcont INTO wt_zlmcont_rec
      INDEX e_row-index.
    sub_mode = c_change.
    CALL SCREEN 208 STARTING AT 10 1.
  ENDMETHOD.                           "handle_double_click
ENDCLASS.
Edited by: Paul Chapman on Jun 13, 2008 6:27 AM