How to set a selected checkbox in output internal table of oops ALV grid

Hi All,
i have a checkbox as first column in my ALV grid output using oops alv, when i select some checkbox, that rows have to be selected and i need to process only selected rows in user command.
i have given the below code also in fieldcatolg.
f_fldcat-fieldname = 'checkbox'.
f_fldcat-tabname ='gi_output'
f_fldcat-checkbox = 'X'.
f_fldcat-edit = 'X'.
but the checkbox is not getting set in internal table when i select some checkboxes.
can anybody explain y the checkbox in internal table not getting set?
Thanks,
Srilakshmi.

Hi,
i tried already whatever u said, but still not resolved.Pasted my code below..can u please look into it.
MODULE pbo OUTPUT.
PERFORM init_container.
PERFORM prepare_field_catalog.
PERFORM prepare_layout.
PERFORM display_output.
ENDMODULE.                 " PBO OUTPUT
*&      Module PAI INPUT
      text
MODULE pai INPUT.
   DATA: lt_rows TYPE lvc_t_row.
CASE gv_okcode.
    WHEN gc_exit OR gc_back OR gc_canc. " Finish program
      LEAVE PROGRAM.
      when 'PRINT'.
       CALL METHOD gv_grid->get_selected_rows
                 IMPORTING et_index_rows = lt_rows.
        CALL METHOD cl_gui_cfw=>flush.
ENDCASE.
ENDMODULE.                 " PAI INPUT
*&      Form INIT_CONTAINER
      text
FORM init_container .
CREATE OBJECT gv_custom_container
    EXPORTING
      container_name = gc_container.
CREATE OBJECT gv_grid
    EXPORTING
      i_parent = gv_custom_container.
CREATE OBJECT gv_document
    EXPORTING
      style = 'ALV_GRID'.
*&      Form PREPARE_FIELD_CATALOG
      text
FORM prepare_field_catalog .
PERFORM fill_catalog USING:
'Table Name'   'Field Name' 'NoZero'   'sel-text'
'GI_OUTPUT' 'CHECKBOX'   ' '           text-013 'X',
'GI_OUTPUT' 'KUNNR'      'X'           text-003 ' ',
'GI_OUTPUT' 'NAME1'      ' '           text-004 ' ',
'GI_OUTPUT' 'BELNR'      'X'           text-005 ' ',
'GI_OUTPUT' 'BLART'      ' '           text-006 ' ',
'GI_OUTPUT' 'BUDAT'      ' '           text-007 ' ',
'GI_OUTPUT' 'BLDAT'      ' '           text-008 ' ',
'GI_OUTPUT' 'DMBTR'      ' '           text-009 ' ',
'GI_OUTPUT' 'WAERS'      ' '           text-010 ' '.
ENDFORM.                    " PREPARE_FIELD_CATALOG
*&      Form FILL_CATALOG
      text
FORM fill_catalog USING    fv_tabname
                            fv_fldname
                            fv_nozero
                            fv_seltxt
                            fv_checkbox.
DATA f_fldcat TYPE lvc_s_fcat.
f_fldcat-fieldname     = fv_fldname.
f_fldcat-tabname       = fv_tabname.
f_fldcat-no_zero       = fv_nozero.
f_fldcat-coltext       = fv_seltxt.
f_fldcat-checkbox      = fv_checkbox.
IF fv_checkbox = gc_x.
    f_fldcat-edit = gc_x.
ENDIF.
APPEND f_fldcat TO gi_fieldcat.
ENDFORM.                    " FILL_CATALOG
*&      Form PREPARE_LAYOUT
      text
FORM prepare_layout .
gs_layout-info_fname = 'COL'.
gs_layout-cwidth_opt = gc_x.
gs_layout-zebra      = gc_x.
gs_layout-no_toolbar = gc_x.
gs_layout-no_rowmark = '1'.
gs_layout-sel_mode = 'A'.
ENDFORM.                    " PREPARE_LAYOUT
*&      Form DISPLAY_OUTPUT
      text
FORM display_output .
CALL METHOD gv_grid->set_table_for_first_display
    EXPORTING
      is_layout       = gs_layout
    CHANGING
      it_outtab       = gi_output
      it_fieldcatalog = gi_fieldcat.
CREATE OBJECT event_receiver.
SET HANDLER event_receiver->handle_user_command FOR gv_grid.
CALL METHOD cl_gui_control=>set_focus EXPORTING control = gv_grid.
ENDFORM.                    " DISPLAY_OUTPUT

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How to make a row as selected in output internal table in oops ALV

Hi All,
I have ALV grid output using oops ALV concept, in my output i have a checkbox as first column when i select this checkbox and press a push button 'Print' which is there above ALV grid that particular line in output table should get selected and i need to code some logic for printing selected row.
how to make the particluar row in the output internal table to be selected and where to write the logic for print once it is pressed?
Thanks in advance
Srilakshmi.

but the checkbox is not getting set in internal table when i select some checkboxes.
can anybody explain y the checkbox in internal table not set?
Hi Srilakshmi,
As explained by Uwe, when we change a field ( say check box ) in ALV grid, the view (frontend) changes (showing the tick mark) but the changed data ( normally ) is not transfered to the backend.
We can initiate this data transfer by just registering the cl_gui_alv_grid=>mc_evt_modified edit event
go_grid->set_table_for_first_display( CHANGING it_fieldcatalog      = pt_fieldcat
                                                  it_outtab            = pt_outtab ).
go_grid->set_ready_for_input( 1 ).
go_grid->register_edit_event( EXPORTING i_event_id = cl_gui_alv_grid=>mc_evt_modified ). " This does the trick
Now as soon as we check a checkbox, the data_changed event is triggered.
This initiates data transfer to the backend and the checkbox field in internal table is updated.
check the below code for example.
DATA: go_cont            TYPE REF TO cl_gui_custom_container,
      go_grid            TYPE REF TO cl_gui_alv_grid,
      gt_fieldcat        TYPE lvc_t_fcat,
      gv_language        TYPE spras VALUE 'E',
      gt_outtab          TYPE TABLE OF bus_loca_demo WITH HEADER LINE.
START-OF-SELECTION.
CALL SCREEN 100.
*       MODULE PBO OUTPUT                                             *
MODULE pbo OUTPUT.
SET PF-STATUS 'BASIC'.
SET TITLEBAR '001'.
PERFORM create_and_init_alv CHANGING gt_outtab[]
                                       gt_fieldcat.
ENDMODULE.                    "pbo OUTPUT
*       MODULE PAI INPUT                                              *
MODULE pai INPUT.
CASE sy-ucomm.
    WHEN 'BACK'.
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    WHEN 'PRINT'.
      BREAK-POINT.
ENDCASE.
ENDMODULE.                    "pai INPUT
FORM create_and_init_alv CHANGING pt_outtab LIKE gt_outtab[]
                                  pt_fieldcat TYPE lvc_t_fcat.
CHECK go_cont IS NOT BOUND.
CREATE OBJECT go_cont
    EXPORTING
      container_name = 'CUSTOM'.
CREATE OBJECT go_grid
    EXPORTING
      i_parent = go_cont.
PERFORM build_display_table.
PERFORM build_fieldcat CHANGING pt_fieldcat.
go_grid->set_table_for_first_display( CHANGING it_fieldcatalog      = pt_fieldcat
                                                  it_outtab            = pt_outtab ).
go_grid->set_ready_for_input( 1 ).
go_grid->register_edit_event( EXPORTING i_event_id = cl_gui_alv_grid=>mc_evt_modified ). " This does the trick
ENDFORM.                               "CREATE_AND_INIT_ALV
FORM build_display_table.
FREE gt_outtab.
DO 10 TIMES.
    gt_outtab-creation_partner = sy-index.
    gt_outtab-date_field       = sy-datum.
    APPEND gt_outtab.
ENDDO.
ENDFORM.                               "build_display_table
FORM build_fieldcat CHANGING pt_fieldcat TYPE lvc_t_fcat.
DATA ls_fcat TYPE lvc_s_fcat.
CALL FUNCTION 'LVC_FIELDCATALOG_MERGE'
    EXPORTING
      i_structure_name = 'BUS_LOCA_DEMO'
    CHANGING
      ct_fieldcat      = pt_fieldcat.
LOOP AT pt_fieldcat INTO ls_fcat.
    CASE ls_fcat-fieldname.
      WHEN 'CHECKBOX'.
        ls_fcat-checkbox = 'X'.
        ls_fcat-edit     = abap_true.
        MODIFY pt_fieldcat FROM ls_fcat.
      WHEN 'ENTER_FIELD' OR 'DBLCLICK_FIELD'.
        ls_fcat-no_out = abap_true.
        MODIFY pt_fieldcat FROM ls_fcat.
    ENDCASE.
ENDLOOP.
ENDFORM.                               "build_fieldcat
Cheers,
Jose.

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How to set a selected checkbox in output internal table of oops ALV grid

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