Refresh nodes of alv tree

[Former Member]

I am trying to refresh an alv tree. I want certain nodes hidden/removed based on what the user selects. So far I have to free my tree and start over and rebuild the nodes. I was wondering if there is a way to just refresh the nodes to display the desired nodes.

I have tried:

call method tree->delete_all_nodes.

then call my process to add the desired nodes.

CALL METHOD tree->frontend_update.

I found the problem when expanding all nodes that a node key is unable to expand. I found that the attribute M_NODE_KEY_COUNT of CL_ALV_TREE_BASE wasn't reset when all the nodes where deleted so it keeps accumulating to the total nodes created when I originally created the tree.

Anybody know how to do this without freeing the tree and starting over.

Thanks.

Brent

[Former Member]

I have the excact same problem.

Did you find a workaround or a solution Brent?

[Former Member]

Hi Brent,

Previously I have a requiremnt to delete some of the nodes from the tree. I have done that it is working for me. But here I am using CL_GUI_ALV_TREE class.

See the code below.

WHEN 'DELETE'.

• get selected node

DATA: LT_SELECTED_NODE TYPE LVC_T_NKEY.

CALL METHOD TREE1->GET_SELECTED_NODES

CHANGING

CT_SELECTED_NODES = LT_SELECTED_NODE.

CALL METHOD CL_GUI_CFW=>FLUSH.

DATA L_SELECTED_NODE TYPE LVC_NKEY.

READ TABLE LT_SELECTED_NODE INTO L_SELECTED_NODE INDEX 1.

• delete subtree

IF NOT L_SELECTED_NODE IS INITIAL.

CALL METHOD TREE1->DELETE_SUBTREE

EXPORTING

I_NODE_KEY = L_SELECTED_NODE

I_UPDATE_PARENTS_EXPANDER = ''

I_UPDATE_PARENTS_FOLDER = 'X'.

ELSE.

MESSAGE I227(0H).

ENDIF.

• update frontend

CALL METHOD TREE1->FRONTEND_UPDATE.

It is working for me. Hope this will help you.

Thanks & Regards,

Siri.

Message was edited by: Srilatha T

Message was edited by: Srilatha T

[Former Member]

Ive been looking thru the code of CL_ALV_TREE_BASE and found that the only place that M_NODE_KEY_COUNT is used is in ADD_NODE where it is incremented by 1. The only time it is set to 1 is when creating a tree object.

This leads me to think that the developers of the cl_gui_alv_tree has forgotten to reset this value. This may be a candidate for an OSS then.

Anders