rich:tree to be expanded by default

[sait]

Hi,

Any ideas on how to have all nodes of rich:tree to be expanded by default?

Thanx in advance

[nbelaevski]

Hi,

Use tree state advisors - see livedemo examples and docs for more.

[sait]

The reason why I am writing on this forum is that I have exactly researched the things you suggested but I could not find clear and actual solution to "rich:tree to be expanded by default" problem.

You suggested to use tree state advisors. Is there a clear example using tree state advisors to solve this solution ??

[nbelaevski]

Sure, check livedemo example for treeNodeAdaptor. Several levels are initially expanded there.

[sait]

TreeDemoStateAdvisor.java

import org.richfaces.component.UITree;
import org.richfaces.component.state.TreeStateAdvisor;
import org.richfaces.model.TreeRowKey;
import org.jboss.seam.annotations.Name;

@Name("treeDemoStateAdvisor")
public class TreeDemoStateAdvisor implements TreeStateAdvisor {

 public Boolean adviseNodeOpened(UITree tree) {
 if (!PostbackPhaseListener.isPostback()) {
 Object key = tree.getRowKey();
 TreeRowKey treeRowKey = (TreeRowKey) key;
 if (treeRowKey == null || treeRowKey.depth() <= 2) {
 return Boolean.TRUE;
 }
 }

 return null;
 }

 public Boolean adviseNodeSelected(UITree tree) {
 return null;
 }

}

PostbackPhaseListener.java

import java.util.Map;

import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;

public class PostbackPhaseListener implements PhaseListener {

 public static final String POSTBACK_ATTRIBUTE_NAME = PostbackPhaseListener.class
 .getName();

 public void afterPhase(PhaseEvent event) {
 }

 public void beforePhase(PhaseEvent event) {
 FacesContext facesContext = event.getFacesContext();
 Map requestMap = facesContext.getExternalContext().getRequestMap();
 requestMap.put(POSTBACK_ATTRIBUTE_NAME, Boolean.TRUE);
 }

 public PhaseId getPhaseId() {
 return PhaseId.APPLY_REQUEST_VALUES;
 }

 public static boolean isPostback() {
 FacesContext facesContext = FacesContext.getCurrentInstance();
 if (facesContext != null) {
 ExternalContext externalContext = facesContext.getExternalContext();
 if (externalContext != null) {
 return Boolean.TRUE.equals(externalContext.getRequestMap().get(
 POSTBACK_ATTRIBUTE_NAME));
 }
 }

 return false;
 }

}

XHTML code

<rich:tree style="width:300px" switchType="ajax" stateAdvisor="#{treeDemoStateAdvisor}">
 <rich:recursiveTreeNodesAdaptor roots="#{fileSystemBean.sourceRoots}" var="item" nodes="#{item.nodes}" />
 </rich:tree>

To keep tree state between pages use solution at http://seamframework.org/Community/ProblemToKeepRichtreeState

Mustafa Sait ÖZEN

[user1234]

From the constructor of your class, call the method


public void changeOpenNode() {
try {
tree.queueExpandAll();
} catch (IOException e) {

}
}

Here variable "tree" is binded with your rich:tree

<rich:tree binding="bean.tree" ...>