Why does the ajax event not fire? - ajax

Question

I've got a primeface tree in my application. I tried to load all data att once it it jsut to much 2500 object, only some are used. So I tried to implement som sort of lazy loading. The first level is loaded on start and I would like to load the neccessary data when expanding the node. I googled some examples and modified it for my purpose. But in my case the ajax does not fire. what am i missing here?
the xhtml part
<h:form>
<p:panel id="add_elev2list"
header="lägg till elev"
collapsed="true"
toggleable="true">
<p:tree value="#{bookb.root}"
var="node"
dynamic="true" >
<p:ajax event="select"
update="#this"
listener="#{bookb.onNodeSelect}"/>
<p:treeNode >
<h:outputText value="#{node}" />
</p:treeNode>
</p:tree>
</p:panel>
</h:form>
Before loading the first level of tree is build by
public void triggerTreeBuild() {
root = new DefaultTreeNode("Root", null);
ObjectContainer localdb = dbConnector.connDB();
ObjectSet<sbasUserList> res;
Query query = localdb.query();
query.constrain(sbasUserList.class);
//query.descend("klass").constrain(true);
res = query.execute();
for(sbasUserList sbu : res ){
if(sbu.isKlass()) {
TreeNode node0 = new DefaultTreeNode(sbu.getGroupname(), root);
node0.getChildren().add(new DefaultTreeNode("head"));
}
}
localdb.close();
}
which works fine. The ajax event should trigger this but it don't happen.
public void onNodeSelect(NodeSelectEvent nee){
log("expand"); //wrapper for System.out.println ... for some sort of debugging.
sbasUserList sbu = (sbasUserList) nee.getTreeNode().getData();
String[] allstd = sbu.getAllusers().split(",");
ObjectContainer localdb = dbConnector.connDB();
for(String persnum : allstd){
nee.getTreeNode().getChildren().add( new DefaultTreeNode(
getUserbyPersnum(localdb,persnum).getRealname()));
}
localdb.close();
}
Any idea why?
Best regards
Ralf
using tomcat 7.0.52 JSf 2.2 and primefaces 4.0

Answer 1

Due to you did not set attribute selectionMode="single".
<p:tree value="#{treeBasicView.root}"
var="node"
dynamic="true"
selectionMode="single">
<p:ajax event="select" listener="#{treeBasicView.onNodeSelect}" />
<p:treeNode>
<h:outputText value="#{node}" />
</p:treeNode>
</p:tree>