Hi,
> selectedPanel.replaceWith(currentPanel);
> java.lang.IllegalStateException: This method can only be called on a
> component that has already been added to its parent.
at org.apache.wicket.Component.replaceWith(Component.java:2717)
Obviously your selected panel is not added to page and you try to call
replaceWith on it.
-Matej
On Wed, Apr 1, 2009 at 2:58 PM, Christian Helmbold
<christian.helmb...@yahoo.de> wrote:
>
> Hello,
>
> I want to switch panels with a tree (like switching panels within a
> TabbedPanel), but get an error when clicking more than once on a node.
>
> It should look like this:
>
> +---------------------------------------------+
> | (TreePanel) |
> | +-------------+ |
> | | (Tree) | |
> | * root | +-----------------------+ |
> | | ** Folder A | | (ContentPanel) | |
> | | *** [File1] | | File1 | |
> | | *** File2 | | | |
> | +-------------+ +-----------------------+ |
> +---------------------------------------------+
>
> The Panel according to the selected node (File1) is displayed.
>
> The top-level TreePanel contains the Tree and the and the ContentPanel.
>
> Java code of TreePanel:
> --------------------------------------------------------------------------------
> public class TreePanel extends Panel{
>
> private Tree tree;
> private NodePanel selectedPanel;
>
>
> public TreePanel(String id, NodePanel rootNode)
> {
> super(id);
> DefaultTreeModel treeModel = new
> DefaultTreeModel(rootNode.getAsTreeNode());
> selectedPanel = rootNode;
>
> add(selectedPanel);
> tree = new Tree("tree", treeModel)
> {
> �...@override
> protected String renderNode(TreeNode node)
> {
> DefaultMutableTreeNode treeNode = (DefaultMutableTreeNode)node;
> Object userObject = treeNode.getUserObject();
> if (userObject instanceof List)
> return "<subtree>";
> else
> {
> NodePanel panel = (NodePanel)userObject;
> return panel.getTitle();
> }
> }
>
> �...@override
> protected void onNodeLinkClicked(AjaxRequestTarget target,
> javax.swing.tree.TreeNode node)
> {
> DefaultMutableTreeNode treeNode = (DefaultMutableTreeNode)node;
> NodePanel currentPanel = (NodePanel)treeNode.getUserObject();
> selectedPanel.replaceWith(currentPanel);
> }
> };
>
> add(tree);
> }
>
> /**
> * Get a reference to the tree to configure or query it.
> * @return
> */
> public Tree getTree()
> {
> return tree;
> }
>
> }
> --------------------------------------------------------------------------------
>
> In the Page class that uses my TreePanel I add some NodePanls to the tree.
> When I open the Page in the browser, the root panel is displayed as expected.
> When I click on a node the first time everything is fine and the panel gets
> replaced, but when I click on another link I get:
>
> WicketMessage: Method onLinkClicked of interface
> org.apache.wicket.markup.html.link.ILinkListener targeted at component
> [MarkupContainer [Component id = nodeLink]] threw an exception
>
> Root cause:
>
> java.lang.IllegalStateException: This method can only be called on a
> component that has already been added to its parent.
> at org.apache.wicket.Component.replaceWith(Component.java:2717)
> at
> com.helmbold.wicket.components.tree.TreePanel$1.onNodeLinkClicked(TreePanel.java:53)
> ...
>
> What's wrong with my code?
>
> Regards
> Christian
>
>
>
> PS:
>
> For completeness the code of NodePanel (ContentPanel in the example extends
> NodePanel):
> --------------------------------------------------------------------------------
> public abstract class NodePanel extends Panel{
>
> private DefaultMutableTreeNode treeNode = new DefaultMutableTreeNode(this);
>
>
> /**
> * Constructs a NodePanel with the given id.
> * @param id wicket:id
> */
> public NodePanel(String id)
> {
> super(id);
> }
>
>
> /**
> * Wraps this object in a DefaultMutableTreeNode.
> * @return A DefaultMutableTreeNode object which returns this object when
> * DefaultMutableTreeNode#getUserObject() is invoked.
> */
> public DefaultMutableTreeNode getAsTreeNode()
> {
> return treeNode;
> }
>
>
> /**
> * Add a child in the tree hierarchy - not a nested panel this a panel!
> * @param child
> */
> public void addChild(NodePanel child)
> {
> treeNode.add(child.getAsTreeNode());
> }
>
>
> /**
> * @return Title of the Panel that will be displayed as node link in the
> tree.
> */
> public abstract String getTitle();
>
> }
> --------------------------------------------------------------------------------
>
>
>
>
>
>
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