How to set selected row on startup of an alv tree build with cl_salv_tree

Question

HI,
I have a cl_salv_tree and want the tree structure to open a specific node when starting the report. My coding is something like that:
  DATA: lr_selections       TYPE REF TO cl_salv_selections_tree,
        lr_nodes            TYPE REF TO cl_salv_nodes,
        lr_node             TYPE REF TO cl_salv_node,
        lv_node_index(12)   TYPE c,
        lt_nodes            TYPE salv_t_nodes,
        ls_nodes            TYPE salv_s_nodes,
        lr_item             TYPE REF TO cl_salv_item.
lr_selections = lr_tree->get_selections( ).
lt_nodes = lr_selections->get_selected_nodes( ).
lr_item = lr_selections->get_selected_item( ).
IF lr_item IS NOT BOUND.
  lr_nodes = lr_tree->get_nodes( ).
  lr_node = lr_nodes->get_node( lv_node_index ).  "lv_node_index is the index of the node i want to be open on startup
  ls_nodes-key = lv_node_index.
  ls_nodes-node = lr_node.
  APPEND ls_nodes TO lt_nodes.
  lr_selections->set_selected_nodes( lt_nodes ).
ELSE.
  ls_nodes-node = lr_item->get_node( ).
  ls_nodes-key = ls_nodes-node->get_key( ).
  APPEND ls_nodes TO lt_nodes.
  lr_selections->set_selected_nodes( lt_nodes ).
ENDIF.
This coding is also used, when the report is running and someone clicks an a row. So thats why I check if a item is marked
or the total row.
But the tree always starts without opening the node.
Do I use the right methods or am I totally wrong ????
Thx for your help in advance
dinodini
Edited by: dinodini on Nov 16, 2010 6:51 PM

Answer 1

What you are looking for is the similar functionality which could be achieved by the method EXPAND_NODE of the ALV Tree created using CL_GUI_ALV_TREE. In SALV Tree, you can use the method EXPAND of the class CL_SALV_NODE to show all the subnodes of that node, not by using the SELECTION.
Once you add the Node using the method ADD_NODE, you should call the method EXPAND to expand that subtree.
            lr_nodes  = lr_tree->get_nodes( ).
            lr_node =  lr_nodes->ADD_NODE( ... )
            lr_node->EXPAND( COMPLETE_SUBTREE = 'X' ).
Regards,
Naimesh Patel