OOP

I had a module that required display of a set of categories organised by id and parent id. To create a tree view I created a node object and small bit of code to render a HTML drop down form element.

Of course after creating this code I realised this information was in fact surplus to requirements and would potentially confuse users.

The code took too much love to delete so here it is for next time…

class UKOLCatTree {



	public $id;

	public $parentid;

	public $title;

	public $children;

	public $level;



	function __construct($data) {

		$this->id		= $data['id'];

		$this->parentid = $data['parent_id'];

		$this->title	= $data['title'];

		$this->children	= array();

		$this->level	= 0;

	}

	

	function addChild($cat) {

		array_push($this->children, $cat);

		$cat->level = $this->level + 1;

	}

	

	function show() {

		// Show self

		$this->showSelf();

		// Show kids

		foreach ($this->children as $kids) {

			$kids->show();	

		}		

	}

	

	function showSelf() {

		echo '<p>';

		for ($i = 0; $i level; $i++) {

			echo "    ";

			echo "  ";

			if ($i == ($this->level - 1)) {

				echo "|_";

			} else {

				echo ". ";

			}

		}

		echo $this->title . '[' . $this->id . '-' . $this->parentid . ']</p>';

	}

	

	function getOptionHTML() {

		// Show self

		$r = $this->getSelfOptionHTML();

		// Show kids

		foreach ($this->children as $kids) {

			$r .= $kids->getOptionHTML();	

		}

		return $r;

	}

	

	function getSelfOptionHTML() {

		$r = 'id . '">';

		for ($i = 0; $i level; $i++) {

			$r .= "    ";

			if ($i == ($this->level - 1)) {

				$r .= "|_";

			} else {

				$r .= ". ";

			}

		}

		$r .= $this->title . '' . "n";

		return $r;

	}

}





$db =& JFactory::getDBO();

$db->setQuery('SELECT * FROM `#__categories` WHERE section="com_docman"');



// Create root object, start object array and place root in first.

$root = new UKOLCatTree(array('id' => 0, 'parent_id' => 0, 'title' => 'Top'));

$cats = array($root);



// Load rows into UKOLCatTree objects, store objects in array with id as key

$rows = $db->loadAssocList();

foreach ($rows AS $row) {

	// Create object

	$cat = new UKOLCatTree($row);

	// Store in array with id as key

	$cats[$cat->id] = $cat;

}





// Go through array and add each to it's corresponding parent

foreach ($cats AS $cat) {

	// Get parent object

	if (isset($cats[$cat->parentid])) {

		// Don't add the root to itself!

		if ($cat->id != 0) {

			$dad = $cats[$cat->parentid];

			$dad->addChild($cat);

		}	

	} else {

		echo '<p>No parent [' . $cat->parentid . '] for cat [' . $cat->id . ']</p>';

	}

}



// Walk object heirachy to build category tree

// $root->show();



$sel  = '' . "n";

$sel .= $root->getOptionHTML();

$sel .= '' . "n";

echo $sel;

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class UKOLCatTree {

public $id;

public $parentid;

public $title;

public $children;

public $level;

function __construct($data) {

$this->id = $data['id'];

$this->parentid = $data['parent_id'];

$this->title = $data['title'];

$this->children = array();

$this->level = 0;

}

function addChild($cat) {

array_push($this->children, $cat);

$cat->level = $this->level + 1;

}

function show() {

// Show self

$this->showSelf();

// Show kids

foreach ($this->children as $kids) {

$kids->show();

}

function showSelf() {

echo '<p>';

for ($i = 0; $i level; $i++) {

echo " ";

if ($i == ($this->level - 1)) {

echo "|_";

} else {

echo ". ";

}

echo $this->title . '[' . $this->id . '-' . $this->parentid . ']</p>';

}

function getOptionHTML() {

// Show self

$r = $this->getSelfOptionHTML();

// Show kids

foreach ($this->children as $kids) {

$r .= $kids->getOptionHTML();

}

return $r;

}

function getSelfOptionHTML() {

$r = 'id . '">';

for ($i = 0; $i level; $i++) {

$r .= " ";

if ($i == ($this->level - 1)) {

$r .= "|_";

} else {

$r .= ". ";

}

$r .= $this->title . '' . "n";

return $r;

}

$db =& JFactory::getDBO();

$db->setQuery('SELECT * FROM `#__categories` WHERE section="com_docman"');

// Create root object, start object array and place root in first.

$root = new UKOLCatTree(array('id' => 0, 'parent_id' => 0, 'title' => 'Top'));

$cats = array($root);

// Load rows into UKOLCatTree objects, store objects in array with id as key

$rows = $db->loadAssocList();

foreach ($rows AS $row) {

// Create object

$cat = new UKOLCatTree($row);

// Store in array with id as key

$cats[$cat->id] = $cat;

}

// Go through array and add each to it's corresponding parent

foreach ($cats AS $cat) {

// Get parent object

if (isset($cats[$cat->parentid])) {

// Don't add the root to itself!

if ($cat->id != 0) {

$dad = $cats[$cat->parentid];

$dad->addChild($cat);

}

} else {

echo '<p>No parent [' . $cat->parentid . '] for cat [' . $cat->id . ']</p>';

}

// Walk object heirachy to build category tree

// $root->show();

$sel = '' . "n";

$sel .= $root->getOptionHTML();

$sel .= '' . "n";

echo $sel;

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"Don't Panic!"

Creating a parent-child object heirachy to display in tree view

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