11gR1: expanding the current node in a tree programmatically

Question

Does anybody know how to programmatically expand the currently selected node in an af:tree in 11gR1? In all honesty I've searched a million OTN posts and tried a lot of examples but haven't got it working yet.
At it's most simple I have a tree:
<af:tree id="dirTree" value="#{bindings.NodesViewTree.treeModel}" var="node"
             selectionListener="#{tbindings.NodesViewTree.treeModel.makeCurrent}" rowSelection="single"
             binding="#{treeBean.dirTree}" >
  <f:facet name="nodeStamp">
      <af:outputText value="#{node.Name}" id="ot2"/>
  </f:facet>
</af:tree>...of which the user can select a node, and the selectionListener updates the treeModel's current selected row.
I want a button whose actionListener programatically takes the current selected row and expands (aka discloses it). I've a bean like follows:
public class TreeBean {
  private RichTree dirTree;
  public void setDirTree(RichTree dirTree) { this.dirTree = dirTree; }
  public RichTree getDirTree() { return dirTree;  }
  public void doSomething(ActionEvent actionEvent) {
    RowKeySet selectedTreeNodes = dirTree.getSelectedRowKeys();
    RowKeySet disclosedTreeNodes = dirTree.getDisclosedTreeNodes();
   AdfFacesContext.getCurrentInstance().addPartialTarget(dirTree);
}But I can't figure out what to do from here?
Further to this say if we did manage to expand the current selected node, and I happened to know the oracle.jbo.Key of one of the expanded node's child nodes, how can I programatically select it.
As mentioned I know a search of the forums yields a few hits for this topic, but none have yet solved my issue, so I'm hoping somebody can address my problem afresh please.
Thanks for your assistance,
CM.

Answer 1

After a lot of playing it appears the JS approach is a dead-end. Ultimately what I'm attempting to achieve is to allow the user to right click a node in a tree, create a new node, and select the new node for the user. This can't be achieved in JS as the main work of creating the node must be done from the bindings/binding classes only accessible in a backing bean.
So I've finally come up with a backing bean code solution where the user selects a node in a tree, and via a secondary action of selecting a context menu commandMenuItem the following code is executed. When I say "code solution", unfortunately I mean something that compiles & runs without throwing errors (hurrah!), but (sigh) doesn't work. I'm hoping somebody on the forum can give me a kick in the right direction please.
The code:
  RichTree dirTree;
  public void anotherExperimentalCreate(ActionEvent actionEvent)  {
    String parentNodeType = getSelectedNodeType();
    if (parentNodeType.equals(DATABASE)) {
      // create user - todo
    } else if (parentNodeType.equals(FOLDER)) {
      // Fetch data from parent row required for new row
      oracle.jbo.domain.Number parentNodeId = getSelectedNodeId();
      oracle.jbo.domain.Number parentNodeTypeId = getSelectedNodeTypeId();
      DCIteratorBinding treeIterator = AdfUtils.findDCIteratorBinding(NODES_VIEW_TREE_ITERATOR);
      RowSetIterator treeRsi = treeIterator.getRowSetIterator();
      // Create new row
      // Why rsi.createAndInitRow? See - http://radio.weblogs.com/0118231/stories/2003/01/17/whyDoIGetTheInvalidownerexception.html
      Row newRow = treeRsi.createAndInitRow(new NameValuePairs(new String[]{"ParentNodeId"}, new Object[]{parentNodeId}));           
      oracle.jbo.domain.Number newNodeId = (oracle.jbo.domain.Number)newRow.getAttribute("NodeId");
      newRow.setAttribute("ParentNodeId", parentNodeId);
      newRow.setAttribute("NodeTypeId", parentNodeTypeId);
      newRow.setAttribute("Name", "New Folder" + newNodeId.toString());
      treeRsi.insertRow(newRow);
      // Commit changes and refresh iterator so it places new child row at correct location in tree
      FacesCtrlActionBinding commitBinding = AdfUtils.findFacesCtrlActionBinding("Commit");
      commitBinding.execute();     
      treeIterator.executeQuery();
      // Rebuild tree's current selected row by grabbing the current selected rows list (from which this action was invoked)
      // and add the additional new row to the end, with the goal of making the new row selected.
      // For "single" selection tree, and fact this routine can only be invoked via selecting a node, we only need
      // first element from iterator
      // Technique for casting to list derived from following OTN post:
      //    ADF Faces  - type of key element!
      List<Key> currentSelectedRowKeys = (List<Key>)dirTree.getSelectedRowKeys().iterator().next();
      ArrayList<Key> newSelectedRowKeys = new ArrayList<Key>();
      // Copy existing selected row keys to our new selected row key list
      for (Key currentSelectRowKey : currentSelectedRowKeys) {
        newSelectedRowKeys.add(currentSelectRowKey);
      // Add our new row's key to the end of the list
      newSelectedRowKeys.add(newRow.getKey());
      RowKeySetTreeImpl newSelectedRowKeySetTree = new RowKeySetTreeImpl();
      newSelectedRowKeySetTree.add(newSelectedRowKeys);
      // **** doesn't work ****
      dirTree.setSelectedRowKeys(newSelectedRowKeySetTree);
      AdfFacesContext.getCurrentInstance().addPartialTarget(dirTree);
  }As per the "doesn't work" annotation above, the problem is when the tree is refreshed via the PPR event, the tree hasn't selected the new row as passed to setSelectedRowKeys. Instead the state of the tree (expand/collapse) is the same as before the code is fired, though the new row is present as a child.
Has anybody any clues at all on what I can attempt to try next please?
Regards,
CM.