Rich tree , build by refreshing tree from database

[theanswer]

Hi all, I am building a rich tree and everything is fine.The problem is I GET Data from databse and the data is 20,000.So I cannot get all the data and build the tree.I need on expand, to go to databse and bring on the data and add it to the tree.

<rich:tree   adviseNodeSelected="#{treeBB.adviseNodeSelected}" adviseNodeOpened="#{treeBB.adviseNodeSelected}"       nodeSelectListener="#{treeBB.processSelection}" 

     nodeFace="#{treeNode.parent.parent == null ? 'node' : 'leaf'}"

    selectedClass="tree-selected" 

     styleClass="font;cursor:pointer;"  style="width:300px"

    switchType="ajax"

    value="#{treeBB.treeNode}"  var="item">

        <a4j:support ajaxSingle="true" event="onexpand"  action="#{treeBB.expand}">

            <f:param name="expandedRight"  value="23"/>

        </a4j:support>   

<a4j:support event="onselected" reRender="aPan"   />   

        <rich:treeNode   type="node">

                <h:outputText  value="#{item.name}">

                </h:outputText>

        </rich:treeNode>

    </rich:tree>

the bold part,  on treebb.expand i am able to read parameter 23. However When I do this,   <f:param name="expandedRight"  value="item.name"/> I am unable to read it.Its empty. Why?

[theanswer]

any help?

i wanto to build a tree were i bring the child data on expand..and not all the data together at start. this because i have so much of data ( 20,000)

[ilya40umov]

Try this approach:

1) Look at this link:

http://livedemo.exadel.com/richfaces-demo/richfaces/treeNodesAdaptor.jsf?c=recursiveTreeNodesAdaptor

2) Write getNodes() method in a such way as it should load data from DB only on demand.

Is it ok for you?