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alv tree


I have developed a ALV tree program using class CL_GUI_ALV_TREE.

How to refresh the Tree after some modifications done by the user.

Pls help. I tried REFRESH_TABLE_DISPLAY but its s Private method which i'm not able to use. Also tried FRONTEND_UPDATE which doens't work

Pls help


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2 Answers

  • Aug 16, 2007 at 11:51 AM

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    Aug 16, 2007 at 12:58 PM

    Refreshing the ALV tree display is not actually as simple as it sounds, as there is no actual refresh functionality available. You basically have to delete all the top level nodes and then re-add everything as if you are building the hierachy from new.

    <b>Declare table to store top leve nodes in top include</b>

    types: begin of t_topnodes,
     nodekey type lvc_nkey,
    end of t_topnodes.
    data: it_topnodes type standard table of t_topnodes,
          wa_topnodes like line of it_topnodes.

    <b>Add code to build top level node table</b>




    • text


    • Builds ALV tree display, (inserts nodes, subnodes etc)


    form create_alvtree_hierarchy.
      data: ls_sflight type sflight,
            lt_sflight type sflight occurs 0.
      data: ld_ebeln_key type lvc_nkey,
            ld_ebelp_key type lvc_nkey.
      loop at it_ekko into wa_ekko.
        perform add_ekko_node using      wa_ekko
                                changing ld_ebeln_key.
            wa_topnodes-nodekey = ld_ebeln_key.
            append wa_topnodes to it_topnodes.
        loop at it_ekpo into wa_ekpo where ebeln eq wa_ekko-ebeln.
          perform add_ekpo_line using      wa_ekpo
                                  changing ld_ebelp_key.
    * calculate totals
      call method gd_tree->update_calculations.
    * this method must be called to send the data to the frontend
      call method gd_tree->frontend_update.
    endform.                    " CREATE_ALVTREE_HIERARCH

    <b>Add code to to the ALV Tree user command functionality</b>

    class lcl_toolbar_event_receiver implementation.
      method on_function_selected.
        data: ls_gmsec type zgmsec,
               ld_answer type c.
        case fcode.
          when 'CHNG'.
            data: ld_uname type zgmuserparam-uname.
            data: lt_selected_node type lvc_t_nkey.
            call method tree1->get_selected_nodes
                ct_selected_nodes = lt_selected_node.
            call method cl_gui_cfw=>flush.
            data l_selected_node type lvc_nkey.
            check not lt_selected_node[] is initial.
            read table lt_selected_node into l_selected_node index 1.
            call method tree1->get_outtab_line
                i_node_key    = l_selected_node
                e_outtab_line = ls_gmsec.
            if ls_gmsec-uname is initial.
              message i010(ad) with 'Please choose a valid user'.
    • Example: i.e calls screen to allow user to make chnage

    call screen 0300.

    • AT this point user has returned from a screen (i.e. 300) which

    • allowed them to make changes to existing data/node

    • The following code deletes all the existing nodes using the top

    • node table populated earlier

     loop at it_topnodes into wa_topnodes.
                call method TREE1->DELETE_SUBTREE
                    i_node_key = wa_topnodes-nodekey.
              call method cl_gui_cfw=>flush.

    • Now you need to re-select your data and re-build your hierarchy

    • from scratch. for example the code could look somthing like this.

    REFRESH: it_ekko, it_ekpo.
              SELECT ebeln
              UP TO 10 ROWS
                FROM ekko
                INTO corresponding fields of TABLE it_ekko.
              loop at it_ekko into wa_ekko.
                SELECT ebeln ebelp statu aedat matnr menge meins 
                       netpr peinh
                  FROM ekpo
                  appending TABLE it_ekpo
                 where ebeln eq wa_ekko-ebeln.
              perform create_alvtree_hierarchy.

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