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JTree problem  RSS feed

 
Dave Robbins
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Posts: 131
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Hello All,

I've got an app where I'm trying to dynamically insert nodes into a JTree
So, I have a button whose event handler looks like this


try
{


TreePath parentPath = m_app.jTree1.getSelectionPath();
DefaultMutableTreeNode node = (DefaultMutableTreeNode)parentPath.getLastPathComponent();
DefaultMutableTreeNode child = new DefaultMutableTreeNode("foo");
m_app.treeModel.insertNodeInto(child, node, 0);
//m_app.treeModel.reload();
m_app.jTree1.scrollPathToVisible(new TreePath(child.getPath()));
}
catch(Exception e)
{
System.out.println("Error in jButton1ActionPerformed = " + e.toString());
}
}


where "m_app.jTree1" is the tree
when I click the button a node get's properly inserted into the selected node as long as that node has no children.
If it has children, nothing happens
no node
no exception
no nothing
I suspect there's something wrong with the way I'm getting the path to the currently selected node.

note: when the app starts, it build the initial tree from info in a database and everything works fine. it's just when I later try to dynamically add more nodes that I have a problem

Ideas??
Dave
 
Dave Robbins
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Posts: 131
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figured it out
had to do with using the root node in the tree constructor rather than the treemodel

Dave
 
It is sorta covered in the JavaRanch Style Guide.
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