The <rich:changeExpandListener> represents an action listener method that is notified on an expand/collapse event on the node.
Table 6.478. rich : changeExpandListener attributes
Attribute Name | Description |
---|---|
binding | The attribute takes a value-binding expression for a component property of a backing bean |
Table 6.479. Component identification parameters
Name | Value |
---|---|
listener-class | org.richfaces.event.NodeExpandedListener |
event-class | org.richfaces.event.NodeExpandedEvent |
tag-class | org.richfaces.taglib.ChangeExpandListenerTag |
To create the simplest variant on a page use the following syntax:
Example:
...
<rich:changeExpandListener type="demo.Bean"/>
...
Example:
package demo;
public class ImplBean implements org.richfaces.event.NodeExpandedListener{
...
}
import demo.ImplBean;
...
ImplBean myListener = new ImplBean();
...
The <rich:changeExpandListener> is used as a nested tag with <rich:tree> and <rich:treeNode> components.
Attribute "type" defines the fully qualified Java class name for the listener. This class should implement org.richfaces.event.NodeExpandedListener interface.
The typical variant of using:
...
<rich:tree switchType="server" value="#{project.data}" var="item" nodeFace="#{item.type}">
<rich:changeExpandListener type="demo.ListenerBean"/>
...
<!-- Tree nodes -->
...
</rich:tree>
...
Java bean source:
package demo;
import org.richfaces.event.NodeExpandedEvent;
public class ListenerBean implements org.richfaces.event.NodeExpandedListener{
...
public void processExpansion(NodeExpandedEvent arg0){
//Custom Developer Code
}
...
}
...