ALV Tree with editable checkbox

Question

Hi all,
I have a ALV Tree with editable checkbox (for all the parent & leaf  nodes) , as one of the column.On clicking of a button in toolbar , i should get the nodes which are checked in checkbox.
But the problem is i am not able to get the nodes which are checked through checkbox in the PAI of the screen,when the button is clicked.
I tried using    
CALL METHOD wf_tree->get_checked_items             
                       IMPORTING
                       et_checked_items = lint_selected_node.
but the return table is not containing any entries , even if check boxes are checked in ALV tree.I tried the GET_CHECKED_ITEMS method in event handler method of AFTER_USER_COMMAND and also CHECKBOX_CHANGE , but no success.
lfs_item_layout-fieldname = 'CHECK'.
  lfs_item_layout-class = cl_gui_column_tree=>item_class_checkbox.
  lfs_item_layout-editable = 'X'.
  lfs_item_layout-CHOSEN = 'X'.
  APPEND lfs_item_layout TO lint_item_layout.
CALL METHOD wf_tree->add_node
    EXPORTING
      i_relat_node_key = p_lfs_final_key
      i_relationship   = cl_gui_column_tree=>relat_last_child
      i_node_text      = l_node_text
      is_outtab_line   = p_gfs_final
      is_node_layout   = lfs_node
      it_item_layout   = lint_item_layout
    IMPORTING
      e_new_node_key   = p_loc_qmnum_key.
Friends ,if you can suggest something.
Thanks
Abhijeet

Answer 1

hi ,
i have written below code for registering the CHECKBOX_CHANGE event of CL_GUI_ALV_TREE.
APPEND lfs_event TO lint_events.
    lfs_event-eventid = cl_gui_column_tree=>eventid_CHECKBOX_CHANGE.
  APPEND lfs_event TO lint_events.
  CALL METHOD wf_tree->set_registered_events
    EXPORTING
      events                    = lint_events
    EXCEPTIONS
      cntl_error                = 1
      cntl_system_error         = 2
      illegal_event_combination = 3.
  IF sy-subrc EQ 0.
*    MESSAGE X208(00) WITH 'ERROR'.                          "#EC NOTEXT
  ENDIF.
      SET HANDLER lo_event_receiver->handle_checkbox_change FOR wf_tree.
*      SET HANDLER lo_event_receiver->handle_button_click FOR wf_tree.
    ENDIF.
Also according to below code , i have put a break point in the event handler method of CHECKBOX_CHANGE event , so that control shall come here when check box is checked on ALV tree ...
CLASS lcl_event_receiver DEFINITION.
  PUBLIC SECTION.
    METHODS:
*      handle_checkbox_change FOR EVENT checkbox_change OF cl_gui_alv_tree,
*              importing fcode.
*      handle_button_click FOR EVENT AFTER_USER_COMMAND OF cl_gui_alv_tree
*        IMPORTING ucomm,
      handle_CHECKBOX_CHANGE for event checkbox_change of cl_gui_alv_tree
        importing CHECKED
                  FIELDNAME
                  NODE_KEY.
ENDCLASS.                    "lcl_event_receiver DEFINITION
*       CLASS lcl_event_receiver IMPLEMENTATION
CLASS lcl_event_receiver IMPLEMENTATION.
  METHOD handle_checkbox_change.
    data : lint_selected_node TYPE LVC_T_CHIT.
    BREAK abhijeetg.
*   CHECKED
*   FIELDNAME
*   NODE_KEY
*    case fcode.
*      when 'SELALL'.
*        perform select_all.
*    CALL METHOD WF_TREE->GET_OUTTAB_LINE
*      EXPORTING
*        I_NODE_KEY     =
**      IMPORTING
**        e_outtab_line  =
**        e_node_text    =
**        et_item_layout =
**        es_node_layout =
**      EXCEPTIONS
**        node_not_found = 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.
*    call method cl_gui_cfw=>dispatch.
    CALL METHOD wf_tree->get_checked_items
      IMPORTING
        et_checked_items = lint_selected_node.
    break abhijeetg.
  ENDMETHOD.         
ENDCLASS.
So according to you , I should get the control in the break point , but its not happening with this .. any thing missing ???
Edited by: abhijeet_7013 on Jun 21, 2011 10:31 PM