ajax richfaces tree problems

[mike82]

I keep trying to use richfaces tree component with ajax toggle style. I want to build 3 level tree and I managed to, but with two problems.

1.When I expand nodes on lev1 and lev2 (so the leaves on 3rd lev are displayed) and then I collapse lev1 and then expand again - lev2 shows it is expanded, but no leaves on 3rd lev are displayed - I need to collapse&expand lev2 again.

2.When I click on 3rd lev leaf (NodeSelectedEvent is raised), collapse lev1, and then try to expand it again I got: java.lang.IllegalStateException: No tree element available or row key not set!

Please take a look at my code:

<h:form id="form1">
          <rich:tree style="width:300px" changeExpandListener="#{categoryTree.processToggle}" nodeSelectListener="#{categoryTree.processSelection}"
            reRender="selectedNode" ajaxSubmitSelection="true" switchType="ajax" id="categoriesTree"
            value="#{categoryTree.treeNode}" var="item" stateVar="true">
           <rich:treeNode>
                <h:outputText value="#{item}" />
           </rich:treeNode>
        </rich:tree>
          
        <h:outputText escape="false" value="Selected Node: #{categoryTree.nodeTitle}" id="selectedNode" />
</h:form>     


@Name("categoryTree")
@Scope(ScopeType.PAGE)
public class CategoryTree {
     @In(create=true) private Categories categories;
     private Log log = Logging.getLog(CategoryTree.class);
     private CategoryTreeNode rootNode = null;
   
    private String nodeTitle;
    private Integer selectedCategoryId;
   
    private CategoryTreeCache cache;
   
     public CategoryTree() {
          try {
               cache = CategoryTreeCache.getInstance();
          } catch(Exception ex) {
               log.error("Can't obtain " + cache.getClass().getName() + " instance", ex);
          }
     }
   
    private void addNode(TreeNode node, Category category) {       
        CategoryTreeNode nodeImpl = new CategoryTreeNode();
        nodeImpl.setData(category);       
        node.addChild(category.getCategoryId(), nodeImpl);       
    }
   
    private void addNodes(TreeNode node, Integer parentCategory) {
        List<Category> categoryList = null;
        if(cache.isInCache(parentCategory.toString())) {
             categoryList = cache.getCategories(parentCategory);
        } else {
             categoryList = categories.getCategories(parentCategory);
        }
        cache.addCategories(parentCategory, categoryList);
         Iterator<Category> it = categoryList.iterator();         
         while(it.hasNext()) {              
            addNode(node, it.next());
         }
    }
   
    public void processSelection(NodeSelectedEvent event) {
        HtmlTree tree = (HtmlTree) event.getComponent();
        nodeTitle = (String)tree.getRowData();
        selectedCategoryId = ((CategoryTreeNode)tree.getModelTreeNode(tree.getRowKey())).getCategoryId();
    }
   
    public void processToggle(NodeExpandedEvent event) {
         HtmlTree tree = (HtmlTree) event.getComponent();       
        CategoryTreeNode currentNode = (CategoryTreeNode)tree.getModelTreeNode(tree.getRowKey());
           addNodes(currentNode, currentNode.getCategoryId());
    }
   
    public CategoryTreeNode getTreeNode() {
        if (rootNode == null) {
             rootNode = new CategoryTreeNode();
             rootNode.setData(new Category(0, "Root", -1, (short)0, false));
             addNodes(rootNode, 0);
        }       
        return rootNode;
    }

   
    public String getNodeTitle() {
        return nodeTitle;
    }

    public void setNodeTitle(String nodeTitle) {
        this.nodeTitle = nodeTitle;
    }
}

[jnorman67.jnorman.ni.com]

Francis Drake,

Your post is several months old, so this is probably not helpful to you, but it might be helpful to others:

Regarding problem 2, the exception is thrown when you call getRowData() in processSelection().  You can catch IllegalStateException there and move on.  This isn't the ultimate solution, but, for me, it's a decent work-around until I can get a deeper understanding.