ALV Tree - Event Handler

Question

Hi All,
I amd currently developing an ALV tree program to capture the hierarchy of functional location. I managed to display the hierarchy in ALV Tree using cl_gui_column_tree.
Now, i am working on double clicking the functional location and it will bring me to tcode IL03. But, it seems like i cannot capture of the field value clicked. Below are my source code.  Can anyone pls help me on this? Thank you very much
*&      Form  register_events
      text
-->  p1        text
<--  p2        text
FORM register_events .
Define the events which will be passed to the backend
  DATA: lt_events TYPE cntl_simple_events,
        l_event TYPE cntl_simple_event.
  CALL METHOD gd_tree->get_registered_events
    IMPORTING
      events = lt_events.
  l_event-eventid = cl_gui_column_tree=>eventid_item_double_click.
  l_event-appl_event = 'X'.
  APPEND l_event TO lt_events.
  CALL METHOD gd_tree->set_registered_events
    EXPORTING
      events                    = lt_events
    EXCEPTIONS
      cntl_error                = 1
      cntl_system_error         = 2
      illegal_event_combination = 3.
  IF sy-subrc <> 0.
    MESSAGE x208(00) WITH 'ERROR'.
  ENDIF.
Set Handler
  DATA: l_event_receiver TYPE REF TO lcl_tree_event_receiver.
  CREATE OBJECT l_event_receiver.
  SET HANDLER l_event_receiver->handle_item_double_click FOR gd_tree.
ENDFORM.                    " register_events
CLASS lcl_tree_event_receiver DEFINITION.
  PUBLIC SECTION.
    METHODS handle_item_double_click
      FOR EVENT item_double_click OF cl_gui_alv_tree
      IMPORTING node_key
                fieldname.
ENDCLASS.                    "lcl_tree_event_receiver DEFINITION
CLASS lcl_tree_event_receiver IMPLEMENTATION.
  METHOD handle_item_double_click.
    DATA: lt_selected_nodes TYPE lvc_nkey,
          lt_fieldname      TYPE lvc_fname.
Determine which line is selected
    CALL METHOD gd_tree->get_selected_item
      IMPORTING
        e_selected_node = lt_selected_nodes
        e_fieldname     = lt_fieldname.
    CALL METHOD cl_gui_cfw=>flush.
    SET PARAMETER ID 'IFL' FIELD lt_fieldname.
    SET PARAMETER ID 'ISR' FIELD 'MOB01'.
    CALL TRANSACTION 'IL03' AND SKIP FIRST SCREEN.
  ENDMETHOD.                    "handle_item_double_click
ENDCLASS.                    "lcl_tree_event_receiver IMPLEMENTATION

Answer 1

Hello Goh
Based on your coding you are using CL_GUI_ALV_TREE instead of CL_GUI_COLUMN_TREE.
Calling method get_selected_item within your event handler method is unnecessary because these data are already provided by the event interface.
[code]METHOD handle_item_double_click.
DATA: lt_selected_nodes TYPE lvc_nkey,
lt_fieldname TYPE lvc_fname.
*$Comment: unnecessary because these data are already provided
by the event interface (IMPORTING nodekey fieldname).
Determine which line is selected
**CALL METHOD gd_tree->get_selected_item
**IMPORTING
**e_selected_node = lt_selected_nodes
**e_fieldname = lt_fieldname.
ENDMETHOD. "handle_item_double_click[/code]
The following sample is based in report BCALV_TREE_04 but can be simply applied to your application:
[code]  METHOD handle_item_double_click.
  define local data
    DATA:
      ls_outtab     TYPE sflight.
    FIELD-SYMBOLS:
      <ld_fld>      TYPE ANY.
  Call this method to get the values of the selected tree line
    CALL METHOD g_alv_tree->get_outtab_line
      EXPORTING
        i_node_key     = node_key
      IMPORTING
        e_outtab_line  = ls_outtab
       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.
    ASSIGN COMPONENT fieldname OF STRUCTURE ls_outtab TO <ld_fld>.
    IF ( <ld_fld> IS ASSIGNED ).
  ... Call transaction with selected (item) value.
    ENDIF.
  ENDMETHOD.                    "handle_item_double_click[/code]
The ASSIGN statement will work if no item of the hierarchy part is selected.
Regards
  Uwe