API15:JNode

JNode is a class that allows you to create nodes, normaly used as "leaves" of object-trees. Often used in conjunction with the JTree class.

Defined in

libraries/joomla/base/tree.php

Methods

Method name	Description
__construct	Class constructor, overridden in descendant classes.
addChild
getParent
setParent
hasChildren
getChildren

Importing

jimport( 'joomla.base.tree' );

Code Examples

Tree Structures with JNode

JTree and JNode can be used to create and process simple tree structures. Let's see how this works for JNode with a simple example.

We want represent the family structure of the Smiths. Granny Barbara has two daughters. Stefanie and Aunti Sue. Stefanie has two children, Peter and Stewie. Auntie Sue doesn't have children.

Let's take a look how we can represent this familiy in an object tree.

$barbara = new JNode();
$stefanie = new JNode();
$sue = new JNode();
$peter = new JNode();
$stewie = new JNode();

//Granny Barbara has two children, stefanie, and sue
$barbara->addChild($stefanie);
$barbara->addChild($sue);

/*
 * Sometimes we want declare parent-child relationships the other way around.
 * We can also do that
 */

$peter->setParent($stefanie);
$stewie->setParent($stefanie);

Batch1211 19:48, 22 March 2010 (EDT) Edit comment