Htmlb:tree: Expand All

Question

I tried to implement an "Expand All" functionality for my htmlb:tree. Strangely, I can change the nodes in the tree table, but they are still displayed as closed on the screen.
LOOP AT me->t_tree ASSIGNING <fs> WHERE status = cl_htmlb_treenode=>c_treenode_closed
                                         OR toggle = cl_bdv_co=>c_true.
      <fs>-status = cl_htmlb_treenode=>c_treenode_open.
      <fs>-toggle = cl_bdv_co=>c_false.
ENDLOOP.
Why is this? Has this anything to do with the TOGGLE functionality of the tree (which loads certain subtrees with a new server event) ?

Answer 1

>Has anybody an explanation for this
Delta-Handling is half Black Magic Voodoo anyway.  I assume that the DH server side cache doesn't see any change in those fields (since you have removed them) and therefore doesn't resend them to the client (it only sends changed values).
The Client side cache still has the old values in memory and didn't get an update from the server.  Therefore it still renders the old values.
You might try placing a delta handler block around your tree coding:
<bsp:deltaHandlerBlock id="protectionR2" >
    <htmlb:tree ... />
</bsp:deltaHandlerBlock>
You can try playing with the attributes of the DHBlock.  Try attribute clientCacheClear when you want force a change to the tree.