<rich:tree> Problem with queueNodeExpand() to expand a Path to a leaf

[M. Hofstetter]

Hello,

I am using a rich:tree to display chapters and leafs. A user can click on a chapter to add a new leaf and is forwarded to another page with an input mask. After saving the leaf he is returned to the tree. My goal is to expand a path in the tree from the root to the newly added node. So I stored the id of the newly added node in the session in order to access it upon returning to the TreeView.
As of yet I did not succeed to get the nodes to expand to the newly added node.

I tried several variants. First I used this adviseNodeOpened= binding in the rich tree:

  
public Boolean adviseNodeOpened(final UITree tree) {

		Object key = tree.getRowKey();
		TreeRowKey treeRowKey = (TreeRowKey) key;
		//expand the newly added node
		if(this.expandedNodeId!=null  && ((TreeNodeModel)tree.getRowData(key)).getId() == (this.expandedNodeId)){
			return true;
		}
		//expand nodes to depth 2
		if (treeRowKey == null || treeRowKey.depth() <= 2) {
			return Boolean.TRUE;
		}

		return null;
	}

This does expand all nodes up to the depth of 2 but it does not expand a path to the newly added node (expandedNodeId). Debuging confirmed that the method does return true for the node with the expandedNodeId. I suspect the Problem is that the Parents of the Node will usually not be expanded. I could check for every Node if there is a node with the expandedNodeId deeper in the tree but that seems inefficient.

So I tried another aproach. I read that the rich:tree has some handy methods to expand like richTree.queueExpandAll(). To test the concept I placed a button on my page to expand the whole Tree. If I had been successfull I would have used the richTree.queueNodeExpand() method to expand a path to my desired Node.

I made a binding like this

 <rich:tree styleClass="tree"
                       dropListener="#{viewFragebogenBean.processDrop}"
                       value="#{viewFragebogenBean.treeNode}"
                       var="item"
                       nodeFace="#{item.type}"
                       dragIndicator=":indicator"
                       ajaxSubmitSelection="true"
                       nodeSelectListener="#{viewFragebogenBean.processSelection}"
                       switchType="client"
                       reRender="tagVerwaltung_datatable, selectNodeDetails"
                      [b] binding="#{viewFragebogenBean.richTree}"
                       id="viewFragenkatalog_tree"[/b]>
...

Then I placed a button in the same form that rich:tree is in

<a4j:commandButton action="#{viewFragebogenBean.expandAll}" reRender="viewFragenkatalog_tree" value="expand" />

and finally the code of the viewFragebogenBean#expandAll method

public void expandAll(){
		try {
			this.getRichTree().queueExpandAll();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

Unfortunatly the tree will not expand upon pressing the button. I could not figure out why. The binding of rich:tree seems to be working and the expandAll() method runs without error. However there is no reaction on the tree in the browser. If anyone has another idea to expand a path to the desired node or spots an error in my code I would greatly appreciate it.