node selection in a tree

[maxime.renaux]

Hi,
I'm using a <rich:tree> component in a projet and I need to define the selected node. For exemple when the the page is loaded a particular node is selected. Or directly in the java code.

Is there a way to do that in Java or Javascript (or other).

Thanks a lot
Maxime

[slcon1]

In Java you can use the TreeStateAdvisor class:

public class SomeBean implements TreeStateAdvisor{
 public Boolean adviseNodeOpened(UITree tree){
 Object data = tree.getRowData();
 YourTreeModel treeModel = (YourTreeModel) data;
 if(...){
 // open node
 return Boolean.TRUE;
 }
 else if(...){
 // close node
 return Boolean.FALSE;
 }
 // do not change treestate
 return null;
 }

 public Boolean adviseNodeSelected(UITree tree){
 Object data = tree.getRowData();
 ...
 }
}

<rich:tree ... stateAdvisor="someBean" >

[maxime.renaux]

Thanks a lot for the answer but I'm confused in using this method. I have read some topic about the adviseNodeSelected method and it says

"MethodBinding pointing at a method accepting an org.richfaces.component.UITree with return of java.lang.Boolean type. If returned value is: java.lang.Boolean. TRUE, a particular treeNode is selected; java.lang.Boolean.FALSE, a particular treeNode is unselected; null, a particular treeNode saves the current state"

Where do i specify the node that hade to be selected?

Thanks

[whitty69]

I do it during by setting a _selectedNode object on selection and then by doing the following on the adviseNodeSelected routine.

Maybe you could do something similar.

BTW: Sorry for lack of comments in the code. Not good I know.

I am sure there are better ways, but this works great in my app.

public Boolean adviseNodeSelected(UITree tree) {
 if (!PostbackPhaseListener.isPostback()) {
 Object key = tree.getRowData();

 IConfigNode treeRowKey = (IConfigNode) key;
 if (treeRowKey == null) {
 return Boolean.FALSE;
 }
 if (_selectedNode == null) {
 _selectedNode = treeRowKey;
 return Boolean.FALSE;
 }
 return treeRowKey.getId() == _selectedNode.getId();
 }
 return null;
 }

FYI: I also keep a map of the node states for ensuring that they don't loose the states on some refreshing instances.

 public Boolean adviseNodeOpened(UITree tree) {

 if (!PostbackPhaseListener.isPostback()) {
 Object key = tree.getRowKey();
 TreeRowKey<?> treeRowKey = (TreeRowKey<?>) key;
 if (treeRowKey == null) {
 return Boolean.FALSE;
 }
 return getListenerBean().isExpanded(treeRowKey.getPath());
 }

 return null;

 }


 public ListenerBean getListenerBean() {
 if (_listenerBean == null) {
 _listenerBean = new ListenerBean();
 }

 return _listenerBean;
 }


 public class ListenerBean implements
 org.richfaces.event.NodeExpandedListener {

 private Map<String, Boolean> _statesMap = new HashMap<String, Boolean>();

 public void processExpansion(NodeExpandedEvent event)
 throws AbortProcessingException {
 Object source = event.getComponent();
 if (source instanceof HtmlTree) {
 source = ((HtmlTree) source).getRowData();
 }

 if (source instanceof HtmlTreeNode) {
 HtmlTreeNode n = (HtmlTreeNode) source;
 // assume it was opened if it was already in the map
 Object o = n.getUITree().getRowKey();
 if (o != null) {
 TreeRowKey<?> key = (TreeRowKey<?>) o;
 String path = key.getPath();
 if (_statesMap.containsKey(path)) {
 _statesMap.put(path, !_statesMap.get(path));
 } else {
 _statesMap.put(path, Boolean.TRUE);
 }
 }
 }
 }

 public void setExpanded(String treeNodeid) {
 _statesMap.put(treeNodeid, Boolean.TRUE);
 }

 public Boolean isExpanded(String treeNodeId) {
 // assume it was opened if it was already in the map
 if (_statesMap.containsKey(treeNodeId)) {
 return _statesMap.get(treeNodeId);
 } else {
 return Boolean.FALSE;
 }
 }

 }