WD ABAP: selecting a tree node from program and scroll to it

Hi guys!
I am using a tree in Web Dynpro ABAP. I would like to select/highlight one node from the coding, without user interaction. Is it possible? I couldn't find any (obvious) way so far...
If it is possible, then let us go a little bit further. Suppose, that the tree grew so big, that cannot fit in the container. Suppose, that you can scroll the tree up/down to see all the nodes. Now, if you mark one tree node from the coding, is it possible somehow, that you scroll the tree automatically, so that the selected node is visible?
I am interested in any solutions within WD ABAP.
If you can only answer one of the questions, that is also appreciated!
Thanks for the help in advance.
Best regards,
Janos Kis
Aerospace&Defense(ERP)

Hi Thomas,
thanks for the advice, it works, I have already tried it. The tree node in the lead selection appears highlighted.
The scrolling doesn't work, though. I have tried to put the tree in a scroll container, and I have also tried it without (relying on the browser to scroll). Neither of them worked, it doesn't scroll to the selected node, it remains offscreen. Can you think of a way, to bring it automatically within the visible range? Ideas, anyone?
Actually we would like to implement a search function in the tree, and show the result within the tree (highlight the node, expand, if necessary, and bring it on the screen, if off-screen)
A negative answer is good enough for me, so that I know, that I can stop looking for a solution. Thanks in advance.
Janos

Similar Messages

Programmatically selecting a Tree node

Hi there,
Given a TreePath object, I need to know how to programmatically select a tree node on a JTree.
Here's the situation:
I have a simple text editor project which has a JTree on its interface representing the local file system. The program has a SaveAs dialog box which also has a duplicate JTree as the one on the main interface (directories only). As the user selects the directory in which they wish to save the open file in the SaveAs dialog box, I need somehow to programmatically cause the JTree on the main interface to correspondingly select the same directory. How is this done?
The whole point of this is so that I can then add a new leaf node to the tree at the specified directory location. I've tried simply setting the jTree1.setSelectionPath(...) method and even tried to call the valueChanged(...) method of the TreeSelectionListener object as you can see from the code snippet below, but none of these approaches have been successful.
Please advise,
Alan
public void createLeafNode()
     jTree1.repaint();
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        return;
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     //Tell the model that the tree structure has changed
     model.nodeStructureChanged(parent);
     path = path.pathByAddingChild(node);
     jTree1.scrollPathToVisible(path);
     //jTree1.repaint();

Yes, I've tried setSelectionPath(TreePath path) numerous times, but it does nothing to select the node on the tree! You can see from the code I submitted that it is there commented out.
Ordinarily, when you click on a node on the tree it becomes the "active" node, evident because it becomes highlighted. But when I use setSelectionPath(TreePath path) method, giving it the path it needs, the node on the tree doesn't become the "active" node, therefore, not selected! Furthermore and subsequently, the rest of the code in the method createLeafNode() doesn't add a new node to the tree in the location specified by the TreePath object!
If you have used setSelectionPath(TreePath path) before successfully I would be interested in seeing a small sample program demonstrating its use. It would have to prove to me that you can select a node in the tree without physically clicking on any node in the tree with the mouse cursor, and add a new child node to that selected node.
I submit to you a small test program I put together that demonstrates the "typical setup". It requires the user to physically click on a node of the tree, then click on a button that adds a new node in the location of the selected node. If you can alter this program demonstrating that you can add a new node to the tree without my having to click on any node of the tree with my cursor, then I'll assign you the Duke Dollars and be forever humbled by your programming prowess.
Thanks for keeping on top of this thread as I've tried everything I can think of to try and make my program work. If you need to ask any questions please ask away. Perhaps there is something about my program that I've not explained yet that you're not aware of that I should have included. At this point I can't see the forest for the trees.
Alan
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.JTree;
import javax.swing.event.*;
import javax.swing.tree.*;
public class AddNodeExample extends JFrame implements ActionListener
JTree jTree1 = null;
DefaultTreeModel model = null;
DefaultMutableTreeNode rootNode = null;
JScrollPane jScrollPane1 = null;
JLabel status = new JLabel("Status:");
TreePath path = null;
JButton add = new JButton("Add new node");
public static void main(String[] args)
    AddNodeExample example = new AddNodeExample();
    example.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
public AddNodeExample()
    super("Add Node To JTree Example");
    setSize(400, 300);
    jScrollPane1 = new JScrollPane();
    add.addActionListener(this);
    DefaultMutableTreeNode[] boys = new DefaultMutableTreeNode[6];
    boys[0] = new DefaultMutableTreeNode("Harry");
    boys[1] = new DefaultMutableTreeNode("Tom");
    boys[2] = new DefaultMutableTreeNode("Jake");
    boys[3] = new DefaultMutableTreeNode("Brian");
    boys[4] = new DefaultMutableTreeNode("Alan");
    boys[5] = new DefaultMutableTreeNode("Guy");
    DefaultMutableTreeNode[] girls = new DefaultMutableTreeNode[6];
    girls[0] = new DefaultMutableTreeNode("Debbie");
    girls[1] = new DefaultMutableTreeNode("Jane");
    girls[2] = new DefaultMutableTreeNode("Sally");
    girls[3] = new DefaultMutableTreeNode("Jessica");
    girls[4] = new DefaultMutableTreeNode("MoonUnit");
    girls[5] = new DefaultMutableTreeNode("Sara");
    rootNode = new DefaultMutableTreeNode("Students");
    DefaultMutableTreeNode Boys = new DefaultMutableTreeNode("Boys");
    DefaultMutableTreeNode Girls = new DefaultMutableTreeNode("Girls");
    //Fill up the node for boys
    for(int i = 0; i < boys.length; i++)
      Boys.add(boys);
//Fill up the node for girls
for(int i = 0; i < girls.length; i++)
Girls.add(girls[i]);
//add Boys and Girls to rootNode
rootNode.add(Boys);
rootNode.add(Girls);
model = new DefaultTreeModel(rootNode);
jTree1 = new JTree(model);
jTree1.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
jTree1.putClientProperty("JTree.lineStyle", "Angled");
jTree1.addTreeSelectionListener(new TreeSelectionListener()
public void valueChanged(TreeSelectionEvent event)
     path = event.getPath();
DefaultMutableTreeNode node = getTreeNode(path);
status.setText("Selected: " + (String)node.getUserObject());
jScrollPane1.getViewport().add(jTree1, null);
getContentPane().add(jScrollPane1, BorderLayout.CENTER);
getContentPane().add(add, BorderLayout.NORTH);
getContentPane().add(status, BorderLayout.SOUTH);
setVisible(true);
public DefaultMutableTreeNode getTreeNode(TreePath path)
return (DefaultMutableTreeNode)(path.getLastPathComponent());
public void actionPerformed(ActionEvent e)
jTree1.repaint();
if (path == null || path.getPathCount() < 1)
     return;
DefaultMutableTreeNode treeNode = getTreeNode(path);
DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("My New Node");
treeNode.add(newNode);
model.nodeStructureChanged(treeNode);
path = path.pathByAddingChild(newNode);
jTree1.scrollPathToVisible(path);

How to hide a tree node from the GUI but still keep it in the tree model?

Hi, All
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Here's an example using a derivation of DefaultTreeModel that shows (or does not show) two types of Sneech (appologies to the good Dr Zeus) by overiding two methods on the model.
Now, there are many things wrong with this example (using instanceof, for example), but it's pretty tight and shows one way of doing what you want.
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import javax.swing.JTree;
import javax.swing.JScrollPane;
import javax.swing.JOptionPane;
import javax.swing.JCheckBox;
import javax.swing.JPanel;
import javax.swing.tree.TreePath;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.DefaultMutableTreeNode;
import java.awt.Dimension;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
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class FilteredTree
     private class PlainBelliedSneech {
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     private class StarBelliedSneech {
          public String toString() { return "Star Bellied Sneech"; }
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               if (showStarBelliedSneeches != mShowStarBelliedSneeches) {
                    mShowStarBelliedSneeches= showStarBelliedSneeches;
                    Object[] path= { mRoot };
                    int[] childIndices= new int[root.getChildCount()];
                    Object[] children= new Object[root.getChildCount()];
                    for (int i= 0; i< root.getChildCount(); i++) {
                         childIndices= i;
                         children[i]= root.getChildAt(i);
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          DefaultMutableTreeNode child;
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                         child.add(new DefaultMutableTreeNode(new PlainBelliedSneech()));
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                    parent.add(new DefaultMutableTreeNode(new PlainBelliedSneech()));
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                    child= new DefaultMutableTreeNode(new PlainBelliedSneech());
                    parent.add(child);
                    for (int k= 0; k< 2; k++)
                         child.add(new DefaultMutableTreeNode(new StarBelliedSneech()));
               for (int j= 0; j< 2; j++)
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          final FilteredTreeModel model= new FilteredTreeModel(root);
          JTree tree= new JTree(model);
tree.setShowsRootHandles(true);
tree.putClientProperty("JTree.lineStyle", "Angled");
          tree.setRootVisible(false);
          JScrollPane sp= new JScrollPane(tree);
          sp.setPreferredSize(new Dimension(200,400));
          final JCheckBox check= new JCheckBox("Show Star Bellied Sneeches");
          check.setSelected(model.getShowStarBelliedSneeches());
          check.addActionListener(new ActionListener() {
               public void actionPerformed(ActionEvent e) {
                    model.setShowStarBelliedSneeches(check.isSelected());
          JPanel panel= new JPanel(new BorderLayout());
          panel.add(check, BorderLayout.NORTH);
          panel.add(sp, BorderLayout.CENTER);
          JOptionPane.showOptionDialog(
               null, panel, "Sneeches on Beeches",
               JOptionPane.DEFAULT_OPTION,
               JOptionPane.PLAIN_MESSAGE,
               null, new String[0], null
          System.exit(0);
     public static void main(String[] argv) {
          new FilteredTree();

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Others might find this process useful for issues with iTunes 11.1.4.62....
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Apple Software Update
Apple Mobile Device Support (if this won't uninstall move on to the next item)
Bonjour
Apple Application Support
Reboot, download iTunes, then reinstall, either using an account with administrative rights, or right-clicking the downloaded installer and selecting Run as Administrator.
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HT1925: Removing and Reinstalling iTunes for Windows XP
HT1923: Removing and reinstalling iTunes for Windows Vista, Windows 7, or Windows 8
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It's a good idea, but no one will see your request here. Virtually no Adobe staff looks in this Creative Suite forum.
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'''Try Firefox Safe Mode''' to see if the problem goes away. [[Troubleshoot Firefox issues using Safe Mode|Firefox Safe Mode]] is a troubleshooting mode that turns off some settings and disables most add-ons (extensions and themes).
''(If you're using an added theme, switch to the Default theme.)''
If Firefox is open, you can restart in Firefox Safe Mode from the Help menu by clicking on the '''Restart with Add-ons Disabled...''' menu item:<br>
[[Image:FirefoxSafeMode|width=520]]<br><br>
If Firefox is not running, you can start Firefox in Safe Mode as follows:
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''Once you get the pop-up, just select "'Start in Safe Mode"''
[[Image:Safe Mode Fx 15 - Win]]
'''''If the issue is not present in Firefox Safe Mode''''', your problem is probably caused by an extension, and you need to figure out which one. Please follow the [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] article to find the cause.
''To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.''
When you figure out what's causing your issues, please let us know. It might help others with the same problem.
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WD ABAP: selecting a tree node from program and scroll to it

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