Shortdump in ALV-Grid when building a node-hierarchy

[Former Member]

Hi Experts,

i read several posts to my problem, but i found no solution.

I want to build a header-hierarchy in my report. for this i use the following form:

FORM add_h_header_line USING  s_zma_header TYPE zma_header
                              p_relat_key TYPE lvc_nkey
                     CHANGING p_node_key TYPE lvc_nkey.
  DATA: l_node_text TYPE lvc_value,
        s2_zma_header  TYPE zma_header.

  DATA: lt_item_layout TYPE lvc_t_layi,
        ls_item_layout TYPE lvc_s_layi,
        ls_node_layout TYPE lvc_s_layn.
 set item-layout
  ls_item_layout-t_image = '@7T@'.
  ls_item_layout-fieldname = tree1->c_hierarchy_column_name.
  APPEND ls_item_layout TO lt_item_layout.
* longtext for CARRID
  READ TABLE it_u_header WITH KEY typ = s_zma_header-typ.
  l_node_text =  it_u_header-text.
* D'n'D-ID
  ls_node_layout-dragdropid = g_handle_tree.
* add node for CARRID
  CALL METHOD tree1->add_node
    EXPORTING
      i_relat_node_key = p_relat_key
      i_relationship   = cl_gui_column_tree=>relat_last_child
      i_node_text      = l_node_text
      is_node_layout   = ls_node_layout
      is_outtab_line   = s2_zma_header
      it_item_layout   = lt_item_layout
    IMPORTING
      e_new_node_key   = p_node_key.
  CLEAR it_u_header.
ENDFORM.                               " ADD_H_HEADER_LINE

When the form calls the method add_node, there will be an shurtdump, because in the method the field-symbol <tab1> can't be assigned:

METHOD ADD_NODE.
  FIELD-SYMBOLS: <TAB1> TYPE standard TABLE,
                 <wa> type any.

  assign mt_outtab->* to <tab1>.

* insert line in outtab
  DATA: L_INDEX TYPE SY-TABIX.
  if is_outtab_line is initial.
*   create initial line
    data l_dref_wa type ref to data.
    create data l_dref_wa like line of <tab1>.
    assign l_dref_wa->* to <wa>.
    l_index = 0.
    append <wa> to <Tab1>.
  else.
    APPEND IS_OUTTAB_LINE TO <TAB1>.
  endif.
  L_INDEX = SY-TABIX.

* add node to model
  CALL METHOD ME->ADD_MODEL_NODE
              EXPORTING
                 I_RELAT_NODE_KEY  = I_RELAT_NODE_KEY
                 I_RELATIONSHIP    = I_RELATIONSHIP
                 IS_NODE_LAYOUT    = IS_NODE_LAYOUT
                 IT_ITEM_LAYOUT    = IT_ITEM_LAYOUT
                 I_NODE_TEXT       = I_NODE_TEXT
                 I_INDEX_OUTTAB    = L_INDEX
              IMPORTING
                 E_NEW_NODE_KEY    = E_NEW_NODE_KEY.

ENDMETHOD.

in other forums I read that I have to build global variables. I did, but it didn't run. Can anybody please help me?

Thank you very much.

Stephan

[franois_henrotte]

MT_OUTTAB is a data reference, in other words a variable containing an address pointing to your data table

as long as you didn't fill the variable with the address, the ASSIGN will cause a short dump

the filling of MT_OUTTAB is done in the method SET_TABLE_FOR_FIRST_DISPLAY

* set pointer to output_table
  get reference of it_outtab into mt_outtab.

so you have to call this method before you are able to add nodes.

the main advantage of class CL_GUI_ALV_TREE is it builds the node hierarchy for you. If you want to build it by yourself you should consider another class like CL_GUI_COLUMN_TREE

[Former Member]

Hi experts,

it works. The reason was as Francois stated.

I placed the SET_TABLE_FOR_FIRST_DISPLAY-Method befor the form add_h_header. So the pointer is set to mt_ottab.

Thank you very much.

[Former Member]

Hi experts,

one more aditional question to this problem.

Is it possible to expand the whole tree on start?

Thank you very much.

[franois_henrotte]

call method EXPAND_NODE and provide parameter I_EXPAND_SUBTREE = 'X'

if you have only one root node you just call it once

if you have several root nodes you have to call it for each root node

[Former Member]

Hi Francois,

thank you very much.

I tried to call the method EXPAND_NODE.

CALL METHOD tree1->expand_node
        EXPORTING
          i_node_key          = ???
          i_level_count       = 1
          i_expand_subtree    = 'X'
*        EXCEPTIONS
*          failed              = 1
*          illegal_level_count = 2
*          cntl_system_error   = 3
*          node_not_found      = 4
*          cannot_expand_leaf  = 5
*          others              = 6
              .

But how can I get the i_node_key?

When I add the node, the variable l_h_header_key is not valid to i_node_key.

CALL METHOD tree1->add_node
        EXPORTING
          i_relat_node_key = ''
*          i_relat_node_key = p_relat_key
          i_relationship   = cl_gui_column_tree=>relat_last_child
          i_node_text      = l_node_text
          is_node_layout   = ls_node_layout
          is_outtab_line   = s2_zma_header
          it_item_layout   = lt_item_layout
        IMPORTING
          e_new_node_key   = l_h_header_key.
      CLEAR it_h_header.

Thank you very much.