Tree node expansion

Hello
I have a tree (showing max levels of 2)and I am trying to programatically open a particular node that is 3 levels down.
Now, I can open a node that is 2 levels down as follows
https://...../f?p=1056:2:3052972033689458:EXPAND,9::::#node10
So,parent node'9' is opened and I can view child node 10.
However, I want to expand child node 10 too simultaneously , so that I can view its child '11'.
In other words, I want to open the tree node pragramatically as many levels as needed to display the desired child node.
Is there any way I can do that. Thanks.
Suni
Edited by: suni1 on May 24, 2010 12:16 PM

I have got the answer.I am having trouble reading your mind. Could you please use more power when transmitting the code that demonstrates the problem. Make sure you transmit the full stack trace of any exception.

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 super.nodeInserted(parent, n, index);
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 TreeNode p = (TreeNode)parent;
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 if(j == index) {
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 public int getChildCount(Object parent) {
 int count = 0;
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 public static void main(String[] args) {
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 HideableMutableTreeNode root = new HideableMutableTreeNode("root");
 root.add(new HideableMutableTreeNode("child_1"));
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 c2.setVisible(false);
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 c2.add(new HideableMutableTreeNode("child_2_B"));
 root.add(c2);
 HideableMutableTreeNode c3 = new HideableMutableTreeNode("child_3");
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 cC.setVisible(false);
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 c3.add(new HideableMutableTreeNode("child_3_D"));
 root.add(c3);
 root.add(new HideableMutableTreeNode("child_4"));
 root.add(new HideableMutableTreeNode("child_5"));
 DefaultMutableTreeNode c6 = new DefaultMutableTreeNode("child_6");
 c6.add(new DefaultMutableTreeNode("child_6_A"));
 c6.add(new DefaultMutableTreeNode("child_6_B"));
 root.add(c6);
 final HideableTreeModel model = new HideableTreeModel(root);
 JTree tree = new JTree(model);
 f.getContentPane().add(new JScrollPane(tree), BorderLayout.CENTER);
 JButton b = new JButton("toggle");
 b.addActionListener(new ActionListener() {
 public void actionPerformed(ActionEvent e) {
 model.setNodeVisible(c2, !model.isNodeVisible(c2));
 //model.ensurePathToNodeVisible(c2a);
 f.getContentPane().add(b, BorderLayout.SOUTH);
 f.pack();
 f.setSize(300, 500);
 f.show();
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import javax.swing.*;
import javax.swing.tree.*;
* <code>HideableMutableTreeNode</code> is a <code>DefaultMutableTreeNode</code>
* implementation that works with <code>HideableTreeModel</code>.
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import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
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import java.io.*;
import java.net.*;
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 } else {
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 * @see #expandPaths(JTree, ArrayList)
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 * Forces the tree to repaint. This is useful when many changes occur
 * under a specific node in the tree structure.
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 public void reload(Object node) {
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 for(int i = 0; i < modelListeners.size(); i++) {
 ((TreeModelListener)modelListeners.elementAt(i)).treeStructureChanged(event);
 * Records the list of currently expanded paths in the specified tree.
 * This method is meant to be called before calling the
 * <code>reload()</code> methods to allow the tree to store the paths.
 * @param tree the tree
 * @param pathlist the list of expanded paths
 public ArrayList getExpandedPaths(JTree tree) {
 ArrayList expandedPaths = new ArrayList();
 addExpandedPaths(tree, tree.getPathForRow(0), expandedPaths);
 return expandedPaths;
 * Adds the expanded descendants of the specifed path in the specified
 * tree to the internal expanded list.
 * @param tree the tree
 * @param path the path
 * @param pathlist the list of expanded paths
 private void addExpandedPaths(JTree tree, TreePath path, ArrayList pathlist) {
 Enumeration enum = tree.getExpandedDescendants(path);
 while(enum.hasMoreElements()) {
 TreePath tp = (TreePath)enum.nextElement();
 pathlist.add(tp);
 addExpandedPaths(tree, tp, pathlist);
 * Re-expands the expanded paths in the specified tree. This method is
 * meant to be called before calling the <code>reload()</code> methods
 * to allow the tree to store the paths.
 * @param tree the tree
 * @param pathlist the list of expanded paths
 public void expandPaths(JTree tree, ArrayList pathlist) {
 for(int i = 0; i < pathlist.size(); i++) {
 tree.expandPath((TreePath)pathlist.get(i));

Hey
I'm not trying to show anyone up here, but having just built a tree model for displaying an XML document in a tree, I thought this seemed like a neat exercise.
I implemented this very differently from the @OP. I only have one class, HiddenNodeTreeModel. All the hidden node data is stored in the model itself in my class. The advantage of what I've created is it will work with any TreeModel. The disadvantage is that I think it's not going to be very scalable - the additional computing to get the number of child nodes and to adjust indexes is heavy. So if you need a scalable solution definitely don't use this.
Anyway here you go
HiddenNodeTreeModel.java
======================
package tjacobs.ui.tree;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JTree;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeModel;
import javax.swing.tree.TreePath;
import tjacobs.ui.WindowUtilities;
public class HiddenNodeTreeModel implements TreeModel {
 TreeModel mModel;
 ArrayList<Object> mHidden = new ArrayList<Object>();
 public HiddenNodeTreeModel (TreeModel model) {
 mModel = model;
 public void addTreeModelListener(TreeModelListener arg0) {
 mModel.addTreeModelListener(arg0);
 private ArrayList<Integer> getHiddenChildren(Object parent) {
 ArrayList<Integer> spots = new ArrayList<Integer>();
 Iterator _i = mHidden.iterator();
 while (_i.hasNext()) {
 Object hidden = _i.next();
 int idx = mModel.getIndexOfChild(parent, hidden);
 if (idx != -1) {
 spots.add(idx);
 return spots;
 public Object getChild(Object arg0, int index) {
 ArrayList<Integer> spots = getHiddenChildren(arg0);
 Collections.sort(spots);
 Iterator<Integer> _i = spots.iterator();
 while (_i.hasNext()) {
 int num = _i.next();
 if (num <= index) {
 index++;
 return mModel.getChild(arg0, index);
 public int getChildCount(Object arg0) {
 ArrayList list = getHiddenChildren(arg0);
 System.out.println("size = " + list.size());
 return mModel.getChildCount(arg0) - list.size();
 public int getIndexOfChild(Object arg0, Object arg1) {
 int index = mModel.getIndexOfChild(arg0, arg1);
 ArrayList<Integer> spots = getHiddenChildren(arg0);
 Collections.sort(spots);
 Iterator<Integer> _i = spots.iterator();
 int toSub = 0;
 while (_i.hasNext()) {
 int num = _i.next();
 if (num <= index) {
 toSub++;
 return index - toSub;
 public Object getRoot() {
 // TODO Auto-generated method stub
 return mModel.getRoot();
 public boolean isLeaf(Object arg0) {
 // TODO Auto-generated method stub
 return mModel.isLeaf(arg0);
 public void removeTreeModelListener(TreeModelListener arg0) {
 mModel.removeTreeModelListener(arg0);
 public void valueForPathChanged(TreePath arg0, Object arg1) {
 mModel.valueForPathChanged(arg0, arg1);
 public void hideNode(Object node) {
 if (node instanceof TreePath) {
 node = ((TreePath)node).getLastPathComponent();
 mHidden.add(node);
 public void showNode(Object node) {
 mHidden.remove(node);
 public void showAll() {
 mHidden.clear();
 * @param args
 public static void main(String[] args) {
 // TODO Auto-generated method stub
 DefaultMutableTreeNode A = new DefaultMutableTreeNode("A");
 DefaultMutableTreeNode B = new DefaultMutableTreeNode("B");
 DefaultMutableTreeNode C = new DefaultMutableTreeNode("C");
 DefaultMutableTreeNode D = new DefaultMutableTreeNode("D");
 DefaultMutableTreeNode E = new DefaultMutableTreeNode("E");
 DefaultMutableTreeNode F = new DefaultMutableTreeNode("F");
 A.add(B);
 B.add(C);
 B.add(D);
 B.add(E);
 E.add(F);
 DefaultTreeModel model = new DefaultTreeModel(A);
 final HiddenNodeTreeModel hmodel = new HiddenNodeTreeModel(model);
 final JTree tree = new JTree(hmodel);
 JFrame jf = new JFrame("HiddenNodeTreeModel Test");
 jf.add(tree);
 JMenuBar bar = new JMenuBar();
 jf.setJMenuBar(bar);
 JMenu menu = new JMenu("Options");
 bar.add(menu);
 final JMenuItem hide = new JMenuItem("Hide");
 final JMenuItem show = new JMenuItem("ShowAll");
 menu.add(hide);
 menu.add(show);
 ActionListener al = new ActionListener() {
 public void actionPerformed(ActionEvent ae) {
 if (ae.getSource() == hide) {
 hmodel.hideNode(tree.getSelectionPath());
 tree.updateUI();
 else {
 hmodel.showAll();
 tree.updateUI();
 hide.addActionListener(al);
 show.addActionListener(al);
 jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 jf.setBounds(100,100,100,100);
 jf.setVisible(true);
}

How to get a Tree Node Value when a Tree is Expanded

My reqiurement is when i Expand a Tree i need the Expanded tree Node Value. For Example Consider Parent as a Root Node of a Tree, and Consider its two Children Child1 and Child2.
When + Parent Expanded
I will Get the Output as --Parent
- Child1
- Child2
so As when i expand the Tree i must Get the String Value Parent.

duplicate
How to get a Tree Node Value when a Tree is Expanded

Assigning Selected Tree Node Value To An Item

Hi guys,
I want to assign selected tree node's value to a page item. This item can be a textbox or a label (display only). How can i do that? I tried to use "Selected Node Page Item" property which is available on Tree Attributes. But I couldn't assign the value without refreshing whole page.
Do you have any idea?
Thanks.

Hi ,
Thank you that was exactly what I was looking for. I couldn't find how to pass database column to javascript as an input parameter. So thanks for your help. I made a couple of correction :
1) I put additional ' characters to ('''||"NAME"||''') this part because my field is varchar.
select case when connect_by_isleaf = 1 then 0
when level = 1 then 1
else -1
end as status,
level,
NAME as title,
null as icon,
"ID" as value,
null as tooltip,
'javascript:setFObjName('''||"NAME"||''')' As link
from "#OWNER#"."TABLE_NAME"
start with "PID" is null
connect by prior "ID" = "PID"
2) In script I have added ' character before and after page item.
function setFObjName(pobjName){
$s('P1_OBJ_NAME', pobjName);
So it works. Thanks tfor your help.

Problems in creating a preorder tree node arraylist

Hi, i want to create an arraylist containing a preorder tree node's name, the program compiled well but every time it gives error when i press the "Output Preorder" button to create the arraylist, the following is the code, can someone help? Thanks a lot!!
                JButton outputPreorderButton = new JButton("Output Preorder");
outputPreorderButton.addActionListener(new ActionListener()
     public void actionPerformed(ActionEvent e)
        for (Enumeration evev = tableTreeRootNode.preorderEnumeration() ; evev.hasMoreElements() ;) {
               System.out.println(evev.nextElement());
               String s = (String)evev.nextElement();
               tableTreeNodesArray.add(s);

Yeah, well, it will "give error" (as you so precisely and informatively say) if there's an odd number of nodes in your tree. Consider your code:System.out.println(evev.nextElement());
// Get element number 1 and print it.
String s = (String)evev.nextElement();
tableTreeNodesArray.add(s);
// Get element number 2 and add it to the list.So, the odd-numbered elements you print. The even-numbered elements you add to the list. If it happens there are 31 nodes, then an error will occur when you try to get node 32.

Creation of a Popup Menu for a Tree Node

Hi Ppl,
I need to create a Pop-up Menu for a tree node in WebDynpro Application, please give me a "How to .." sort of material or a link which would have same sort of information...
Also, My requirement is to call the pop-up on the right click of mouse on the tree node, please let me know on which event handler I can call it ? Do I require a custom event handler for it ?
Thanks in advance
Anish

Hi Anish,
You simply add a Tree UI element, and then right-click the tree UI element and insert a TreeNode element.
To the TreeNode element you can add a menu, and then to this menu you can add menu items. When the user right click the tree node, the menu item is displayed. If the user clicks the menu item, the action for the menuitem is run.
Hope that helps.
Daniel

Read Selected Tree Node value. Jdeveloper Jdeveloper 11.1.2.1.0 11.1.2.1.0

Version: Jdeveloper 11.1.2.1.0
how to get programmatically tree node value.
i have tried but cann't read value from selected node.
please help me.
here is my application creation steps:
1. New Application
2. Fusion Web Application (ADF) Template
3. Create View Object VOTreeMst
Query:
 Select Department_Name,Department_Id
 From Departments
4. Create View Object VOTreeChd
Query:
 Select Last_Name,Employee_Id,Department_Id
 From Employees
5. Create View Link VLTreeMstChd
 VOTreeMst.DepartmentId=VOTreeChd.DepartmentId
 And Add to Application Module
6. Create page page1 in ViewController
 New-->Web Tier-->JSF/Facelets-->Page
 Selected Document Type JSP XML
7. Drag VOTreeMst1 From Data Controls into page1
and select Tree-->ADF Tree
8. ADD java Code into selection Listener
public void nodeSelect(SelectionEvent selectionEvent) {
//original selection listener set by ADF
String adfSelectionListener = "#{bindings.VOTreeMst1.treeModel.makeCurrent}";
//make sure the default selection listener functionality is preserved.
//you don't need to do this for multi select trees as the ADF binding
//only supports single current row selection
/* START PRESERVER DEFAULT ADF SELECT BEHAVIOR */
FacesContext fctx = FacesContext.getCurrentInstance();
Application application = fctx.getApplication();
ELContext elCtx = fctx.getELContext();
ExpressionFactory exprFactory = application.getExpressionFactory();
MethodExpression me = null;
me = exprFactory.createMethodExpression(elCtx, adfSelectionListener, Object.class,
new Class[] { SelectionEvent.class });
me.invoke(elCtx, new Object[] { selectionEvent });
/* END PRESERVER DEFAULT ADF SELECT BEHAVIOR */
RichTree tree = (RichTree)selectionEvent.getSource();
TreeModel model = (TreeModel)tree.getValue();
//get selected nodes
RowKeySet rowKeySet = selectionEvent.getAddedSet();
Iterator rksIterator = rowKeySet.iterator();
//for single select configurations, thi sonly is called once
while (rksIterator.hasNext()) {
List key = (List)rksIterator.next();
JUCtrlHierBinding treeBinding = null;
CollectionModel collectionModel = (CollectionModel)tree.getValue();
treeBinding = (JUCtrlHierBinding)collectionModel.getWrappedData();
JUCtrlHierNodeBinding nodeBinding = treeBinding.findNodeByKeyPath(key);
Row rw = nodeBinding.getRow();
//print first row attribute. Note that in a tree you have to determine the node
//type if you want to select node attributes by name and not index
String rowType = rw.getStructureDef().getDefName();
if(rowType.equalsIgnoreCase("VOTreeMst")){
System.out.println("This row is a department: " + rw.getAttribute("DepartmentId"));
else if(rowType.equalsIgnoreCase("VOTreeChd")){
System.out.println("This row is an employee: " + rw.getAttribute("EmployeeId"));
else{
System.out.println("Huh ????");
// ... do more usefuls stuff here
9. when i click on first node it is working but i click on second node it is not working
error message::
<LifecycleImpl> <_handleException> ADF_FACES-60098:Faces lifecycle receives unhandled exceptions in phase INVOKE_APPLICATION 5
javax.el.ELException: java.lang.NullPointerException
 at com.sun.el.parser.AstValue.invoke(Unknown Source)
 at com.sun.el.MethodExpressionImpl.invoke(Unknown Source)
 at org.apache.myfaces.trinidad.component.UIXComponentBase.broadcastToMethodExpression(UIXComponentBase.java:1589)
 at org.apache.myfaces.trinidad.component.UIXTree.broadcast(UIXTree.java:237)
<RegistrationConfigurator> <handleError> ADF_FACES-60096:Server Exception during PPR, #1
javax.el.ELException: java.lang.NullPointerException
I have also tried using following code but same problem
public void onTreeSelect(SelectionEvent selectionEvent) {
//original selection listener set by ADF
String adfSelectionListener = "#{bindings.VOTreeMst1.treeModel.makeCurrent}";
//make sure the default selection listener functionality is preserved.
//you don't need to do this for multi select trees as the ADF binding
//only supports single current row selection
/* START PRESERVER DEFAULT ADF SELECT BEHAVIOR */
FacesContext fctx = FacesContext.getCurrentInstance();
Application application = fctx.getApplication();
ELContext elCtx = fctx.getELContext();
ExpressionFactory exprFactory = application.getExpressionFactory();
MethodExpression me = null;
me = exprFactory.createMethodExpression(elCtx, adfSelectionListener, Object.class,
new Class[] { SelectionEvent.class });
me.invoke(elCtx, new Object[] { selectionEvent });
/* END PRESERVER DEFAULT ADF SELECT BEHAVIOR */
RichTree tree = (RichTree)selectionEvent.getSource();
TreeModel model = (TreeModel)tree.getValue();
//get selected nodes
RowKeySet rowKeySet = selectionEvent.getAddedSet();
Iterator rksIterator = rowKeySet.iterator();
//for single select configurations, thi sonly is called once
while (rksIterator.hasNext()) {
List key = (List)rksIterator.next();
JUCtrlHierBinding treeBinding = null;
treeBinding = (JUCtrlHierBinding)((CollectionModel)tree.getValue()).getWrappedData();
JUCtrlHierNodeBinding nodeBinding = treeBinding.findNodeByKeyPath(key);
Row rw = nodeBinding.getRow();
//print first row attribute. Note that in a tree you have to determine the node
//type if you want to select node attributes by name and not index
System.out.println("row: " + rw.getAttribute(0));
But
If i create .jspx page From
Web Tier->Jsp->page Then it is working fine
when i create .jspx page From
Web Tier->JSF\Facelets->page Then it is not working
i need to get value from "Web Tier->JSF\Facelets->page"
is there any help please?

You should try Franks generic selectionListener http://www.oracle.com/technetwork/developer-tools/adf/learnmore/25-generic-tree-selection-listener-169164.pdf. For help on hoe to get the selected tree node data check http://www.oracle.com/technetwork/developer-tools/adf/learnmore/26-get-selected-tree-node-data-169165.pdf
Timo

Does an irrepariable "Invalid B-tree node" = unusable HD?

Hello,
I've decided my external LaCie drive has officially "died," but I want to know if it's truly unuseable or if I can just reformat it and start over (with it) again.
The Drive: a LaCie 300GB with one 40GB scratch partition and one 260GB backup partition.
What happened: After a about a week of erratic/slow disk access to the backup partiton (I'd shrugged it off as a full and fragmented drive), it finally just screeched to a snail's pace - so I could read/write to it, but, for example, copying 5MB file to/from it took about 3mins. I quickly backed up as much as I could off of it to another drive (100GB took 14hrs) and just as it finished copying the last file, it disappeared from my sidebar (though the scratch partition was still visible). I Disk Utility and could see it was unmounted and it's "name" had been reset to "disk5s3". Running the First Aid repair resulted in a quick "Invalid B-tree node size" ... "Error: The underlying task reported failure on exit".
Flash forward three days later: After unsuccessfully running Disk Warrior and Data Rescue for 20hrs (progress estimated it would take 400hrs to complete scan) - I gave up.
Sorry for the long setup, but my question is: can I just "zero" the drive and use it again, or is it "damaged" physically and suitable for a paperweight only. If it's usuable after reformatting, is there a way to test the hardware of the drive to assure it's stable?
Thanks for your time!

can I just "zero" the drive and use it again, or is it "damaged" physically and suitable for a paperweight only
Like Dwight I doubt the drive is physically damaged but simply has a damaged catalogue b-tree. The only way you're going to find out though it to erase the drive and write zeros to it. Just be aware that everything on the drive will be lost (though I gather you know that already) if you do this.

How to cut, copy and paste a tree node in JTree?????

Hi, Java GUI guru. Thank you for your help in advance.
I am working on a File Explorer project with JTree. There are cut, copy and paste item menus in my menu bar. I need three EventAction methods or classes to implements the three tasks. I tried to use Clipboard to copy and paste tree node. But I can not copy any tree node from my tree.
Are there any body has sample source code about cut, copy, and paste for tree? If possible, would you mind send me your sample source code to [email protected]
I would appreciate you very very much for your help!!!!
X.G.

Hi, Paul Clapham:
Thank you for your quick answer.
I store the node in a DefaultMutableTreeNode variable, and assign it to another DefaultMutableTreeNode variable. I set up two classes (CopyNode and PasteNode). Here they are as follows:
//CopyNode class
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class CopyNode implements ActionListener{
private TreeList jtree;
String treeNodeName;
TreePath currentSelection;
DefaultMutableTreeNode currentNode;
public CopyNode(TreeList t){
jtree = t;
public void actionPerformed(ActionEvent e){
currentSelection = jtree.tree.getSelectionPath();
if(currentSelection != null){
currentNode = (DefaultMutableTreeNode)(currentSelection.getLastPathComponent());
treeNodeName = currentNode.toString();
//PasteNode class
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.util.*;
import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
public class PasteNode extends DefaultMutableTreeNode{
private TreeList jtree;
CopyNode copyNode;
public PasteNode(TreeList t){
jtree = t;
copyNode = new CopyNode(t);
public DefaultMutableTreeNode addObject(Object child){
DefaultMutableTreeNode parentNode = null;
TreePath parentPath = jtree.tree.getSelectionPath();
if(parentPath == null){
parentNode = jtree.root;
else{
parentNode = (DefaultMutableTreeNode)parentPath.getLastPathComponent();
return addObject(parentNode, child, true);
public DefaultMutableTreeNode addObject(DefaultMutableTreeNode parent, Object child, boolean shouldBeVisible){
DefaultMutableTreeNode childNode = copyNode.currentNode;
if(parent == null){
parent = jtree.root;
jtree.treemodel.insertNodeInto(childNode, parent, parent.getChildCount());
if(shouldBeVisible){
jtree.tree.scrollPathToVisible(new TreePath(childNode.getPath()));
return childNode;
I used these two classes objects in "actionPerformed(ActionEvent e)" methods in my tree:
//invoke copyNode
copyItem = new JMenuItem("Copy");
copyItem.addActionListener(copyNode);
//invoke pasteNode
pasteItem = new JMenuItem("Paste");
pasteItem.addActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
pasteName.addObject(copyName.treeNodeName);
When I run the drive code, making a copy some node from my tree list, I got bunch of error messages.
Can you figour out what is wrong in my two classes? If you have sample code, would you mind mail me for reference.
Thank you very much in advance.
X.G.

How-to synchronize edit forms for a single View Object tree node entrie

Hi all,
I created a tree from a single View Object,
follow this [http://www.oracle.com/technetwork/developer-tools/adf/learnmore/32-tree-table-from-single-vo-169174.pdf]
then i want to create and synchronize edit forms for tree node entries,
follow this [http://www.oracle.com/technetwork/developer-tools/adf/learnmore/50-synchromize-form-treeselection-169192.pdf]
but it not working when i click child node!!
i found the latter tree from many View Object ,but the former tree from single View Object.
what should i do?
Thanks in advance

Hi,
say the tree is built from ViewObject1. In the AM model, create a second View Object instance for this. Say ViewObject2. Create the form from ViewObject2 and the tree from ViewObject1. When creating the tree, use the"Target Data Source" option at the bottom to reference the iterator of ViewObject2. Then create a PartialTrigger on the paneFormLayout that holds the synch form. In the partial trigger property, reference the tree so that when the tree selection changes, the form is updated. Then create a PartialTrigger property on the tree and point it to the submit button of the form so you can show updated values in the tree.
Frank

Tree node expansion

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