Joomla! Documentation™

JTree is a class that allows you to create and walk through object-trees. Used in conjunction with the JNode class.

Defined in

libraries/joomla/base/tree.php

Methods

Method name	Description
__construct	Class constructor, overridden in descendant classes.
addChild
getParent
reset

Importing

jimport( 'joomla.base.tree' );

Code Examples

Tree Structures with JTree and JNote

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

We want to create the Family Tree 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();

$familyTree = new JTree(); //pointer set to root-node
$familyTree->addChild($barbara, true) //pointer set to barbara
$familyTree->addChild($sue) //$sue added as child to barbara, pointer still on barbara
$familyTree->addChild($stefanie, true) //$stefanie added as child to barbara, pointer on stefanie
$familyTree->addChild($peter, true) //$peter added as child to stefanie, pointer on peter
$familyTree->getParent() // pointer set to parent of peter, which is stefanie
$familyTree->addChild($stewie) //$stewie added as child to stefanie, pointer on stefanie

Batch1211 19:52, 22 March 2010 (EDT) Edit comment