try removing the call to expand and set setExpanded(true) to the node...try
this way:
root = new TreeNode() {
{
setExpanded(true);
}
};
2009/8/31 Kedar <[email protected]>
>
> Hi
> I am trying to create a tree which will show list of developers
> from database on screen. It worked fine in hosted mode but when i
> deploy the application it gives 'firstChild is null or not an object'
> exception.
> Then i try to do the same with some dummy data and only tree panel
> on page but still i got the same error.
> I am giving here the code which troubled me, please help me to
> solve this out.
>
> public class Test
> {
> //Outer scope panel to be accessed from outside
> Panel searchProjectPanel = new Panel();
>
> //Tree Panel
> TreePanel devPanel = new TreePanel();
> TreeNode root;
>
> public Test()
> {
> try
> {
>
> devPanel.setHeight(100);
> devPanel.setWidth(230);
> devPanel.setAutoScroll(true);
> devPanel.setRootVisible(true);
>
> //Append a dummy child for the first time
> Window.alert("Some Dummy Nodes");
> TreeNode dummy1 = new TreeNode("Dummy Child");
> TreeNode dummy2 = new TreeNode("Dummy Child");
>
> root = new TreeNode("<b>Developers<b>");
> root.appendChild(dummy1);
> root.appendChild(dummy2);
> root.expand();
>
> Window.alert("Some Dummy Nodes Added to Root");
> devPanel.setRootNode(root);
>
> Window.alert("Root Addedd to Panel");
> searchProjectPanel.add(devPanel);
> }
> catch(Exception e)
> {
> Window.alert("Exception in Test : " +
> e.getMessage());
> }
>
> }
> }
>
> >
>
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