How to expand all the nodes of treeTable? - jsf

Question

I have a tree table and two buttons:
one for collapsing the tree and
the other for expanding,
but they don't work. At the backing bean I did root.setExpanded(true); and root.setExpanded(false); but it doesn't work.
<center>
<p:treeTable value="#{roleMB.root}" var="roleTreeTableVar"
binding="#{roleMB.treeTable}" id="roleTreeTable">
<f:facet name="header">
<center>
<p:commandButton value="Réduire tout"
icon="ui-icon-folder-collapsed" style="font-size: 0.9em"
actionListener="#{roleMB.expandAll}"
update=":roleTreeTableForm:roleTreeTable" />
<p:spacer width="30px" />
<p:commandButton value="Développer tout"
icon="ui-icon-folder-open" style="font-size: 0.9em"
actionListener="#{roleMB.collapseAll}"
update=":roleTreeTableForm:roleTreeTable" />
<p:spacer width="30px" />
</center>
</f:facet>
<p:column style="width:150px">
<f:facet name="header">
Nom de Role
</f:facet>
<h:outputText value="#{roleTreeTableVar.nom}" />
</p:column>
<p:column style="width:100px">
<f:facet name="header">
Id de role
</f:facet>
<h:outputText value="#{roleTreeTableVar.id}" />
</p:column>
<p:column style="width:20px">
<p:commandLink oncomplete="dlgAddRole.show()" value="Ajouter"
update=":addRoleForm:selectRolesNamesId">
<f:setPropertyActionListener value="#{roleTreeTableVar}"
target="#{roleMB.selectedRole}" />
</p:commandLink>
<p:commandLink oncomplete="delRole.show()" value="Supprimer">
<f:setPropertyActionListener value="#{roleTreeTableVar}"
target="#{roleMB.selectedRole}" />
</p:commandLink>
<p:commandLink oncomplete="editRole.show()" value="Modifier">
<f:setPropertyActionListener value="#{roleTreeTableVar}"
target="#{roleMB.selectedRole}" />
</p:commandLink>
</p:column>
</p:treeTable>
</center>

Answer 1

This is recursive method for Collapse and Expande.
public void collapsingORexpanding(TreeNode n, boolean option) {
if(n.getChildren().size() == 0) {
n.setSelected(false);
}
else {
for(TreeNode s: n.getChildren()) {
collapsingORexpanding(s, option);
}
n.setExpanded(option);
n.setSelected(false);
}
}
The variable n is the node than you want to expand or colapse.
When The variable option is false, all children of the n is
collapse, in the another case, is expanded
setSelected(false) indicate than this node isn't selected

Answer 2

You should set the expanded property to true not just for the root node but for all the children nodes as well.

Answer 3

A possible solution might look this:
view.xhtml
<h:form id="form">
...
<p:commandButton update=":form:tree" actionListener="#{view.collapseAll}"
icon="fa fa-minus" title="#{msg.collapseAll}"/>
<p:commandButton update=":form:tree" actionListener="#{view.expandAll}"
icon="fa fa-plus" title="#{msg.expandAll}"/>
...
<p:treeTable id="tree" ...>
...
</p:treeTable>
...
</h:form>
View.java
#Named
#ViewScoped
public class View implements Serializable {
private TreeNode root;
...
public void collapseAll() {
setExpandedRecursively(root, false);
}
public void expandAll() {
setExpandedRecursively(root, true);
}
private void setExpandedRecursively(final TreeNode node, final boolean expanded) {
for (final TreeNode child : node.getChildren()) {
setExpandedRecursively(child, expanded);
}
node.setExpanded(expanded);
}
}

Answer 4

For question: "how can this be realized?"
In code...
public void reloadTree() {
assocRoot = new DefaultTreeNode();
assocRoot.setExpanded(true);
TreeNode currentAssocNode;
AbstractDocument parentAssoc = getParentDocAssociation();
if(parentAssoc !=null) {
TreeNode parentAssocNode = new DefaultTreeNode(parentAssoc);
parentAssocNode.setExpanded(true);
....