Wicket LinkTree subtree collapse/expand

Sebastiaan van Erk Fri, 22 Feb 2008 09:57:57 -0800

Hi,

I'm trying to have a wicket LinkTree collapse and expand subtrees when I click on the respective nodes. I have the following code:


                tree = new LinkTree("tree", createTreeModel()) {
                        @Override

protected void onNodeLinkClicked(final TreeNode node, final BaseTree tree, final AjaxRequestTarget target) {

                                if (!node.isLeaf()) {
                                        if 
(tree.getTreeState().isNodeExpanded(node)) {
                                                collapseAll(node);
                                        } else {
                                                expandAll(node);
                                        }
                                        tree.updateTree(target);
                                } else {

System.out.println(Arrays.toString(((DefaultMutableTreeNode) node).getUserObjectPath()));

                                }
                        }
                };


with the methods expandAll/collapseAll as follows:

        protected void collapseAll(final TreeNode treeNode) {
                tree.getTreeState().collapseNode(treeNode);
                for (final Enumeration e = treeNode.children(); 
e.hasMoreElements();) {
                        collapseAll((TreeNode) e.nextElement());
                }
        }

        protected void expandAll(final TreeNode treeNode) {
                tree.getTreeState().expandNode(treeNode);
                for (final Enumeration e = treeNode.children(); 
e.hasMoreElements();) {
                        expandAll((TreeNode) e.nextElement());
                }
        }

However, I keep getting the following errors (specifically, this happens when I collapse a subtree first, and then collapse a subtree of which the other subtree is a sibling):

java.lang.IllegalStateException: No Page found for component [MarkupContainer [Component id = 200, page = <No Page>, path = 200.AbstractTree$TreeItem]]

     at org.apache.wicket.Component.getPage(Component.java:1639)

at org.apache.wicket.ajax.AjaxRequestTarget.respondComponent(AjaxRequestTarget.java:689) at org.apache.wicket.ajax.AjaxRequestTarget.respondComponents(AjaxRequestTarget.java:605) at org.apache.wicket.ajax.AjaxRequestTarget.respond(AjaxRequestTarget.java:520) at org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:103) at org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1172)

     at org.apache.wicket.RequestCycle.step(RequestCycle.java:1241)
     at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1316)
     at org.apache.wicket.RequestCycle.request(RequestCycle.java:493)

at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:354) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:194) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)

     at java.lang.Thread.run(Thread.java:595)

Does anybody have any ideas what I'm doing wrong and what the correct way to implement this is?


Regards,
Sebastiaan

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Wicket LinkTree subtree collapse/expand

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