How to keep rich:tree component state?

[kanal]

Hi,

I found old discussion in Development part of forum abut rich:tree state: http://community.jboss.org/message/18354

But the solution showed there uses TreeState class, which i cannot find in Richfaces4 M5 (maybe it was only in RF 3.x or is not migrated yet).

There is no org.richfaces.component.state package ;/

I would be grateful for any kind of information about it ;]

[kanal]

After downloading milestone 6 i have checked the packages and there is still no TreeState class in there.

Has the class name changed or maybe there's another way to keep rich:tree component state between navigating through pages?

[nbelaevski]

Hi Paul,

In RF4 you should bind 'expanded' and 'selection' to model beans explicitly using EL-expressions.

[kanal]

Hi Nick,

Could you give me a simple example on how to use these attributes?

[burkatzkim]

I have also problems to keep the state with rich:tree and I would highly appreciate an example.

Maybe it is a good idea to integrate this example with the richfaces showcase? Thank you very much in advance.

[ilya_shaikovsky]

sorry guys.. too much on the team plates prior to Final. so have only simple samples where selection is get from selection change event.

and filled https://issues.jboss.org/browse/RF-10701 for specific demo.

[abdeslam_nasri]

I faced the same problem with refresh instability of rich:tree. I share with you so that may help anyway.

My solution goes deep in reconsidernig the coding of some core java classes in richfaces UI components. Mainly 2 classes AbstractTree.java and TreeRange.java in the package org.richfaces.component had to change. I also added an interface NodeExpansionState that should be implemented by the variable that holds the tree state in the session bean. I attach the sources to this reply.

First, define the tree node class  used by loadTree() method, for example:

public class NamedNode extends DefaultMutableTreeNode 
    implements NodeExpansionState {
    protected String type;
    protected String name;
    protected boolean expanded =false;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    @Override
    public String toString() {
        return this.name;
    }


    public boolean isExpanded() {
        return expanded;
    }

    public void setExpanded(boolean expanded) {
        this.expanded = expanded;
    }


}

In the jsf page where you define your tree:

<rich:tree id="tree"  var="node" keepSaved="true" stateVar="treeState" toggleType="ajax"  value="#{treeBean.rootNodes}" selectionType="ajax" nodeType="#{node.type}" toggleListener="#{treeBean.toggleNodeListener}">

    <rich:treeNode > 
        #{node.name} 
    </rich:treeNode> 
</rich:tree>

In your session bean, define the toggle listener:

@ManagedBean
@SessionScoped
public class TreeBean implements Serializable {
    private List<TreeNode> rootNodes = new ArrayList<TreeNode>();

.....

    public void toggleNodeListener(TreeToggleEvent ev){
        UITree tree = (UITree)ev.getSource();
        NodeExpansionState nodeExp = ((NodeExpansionState)tree.getRowData());
        nodeExp.setExpanded(!nodeExp.isExpanded());
    }

}

You can even decide to set some nodes expanded by default by simply set Expanded to true when you create the tree in addNodes(...) method.