Jotlab

<?php
 
	class TreeHelper extends AppHelper {
 
		function indentTree($array, $counter=0){
			$ret = '';
			$array2 = array();
			$pre = '';
			for($i = 1;$i < $counter; $i++){
				$pre .= '--';
			}
 
			foreach($array as $key => $value){
				if($key == 'children'){
					if(isset($value['Category']) || (isset($value['children']) && sizeof($value['children']) > 0)){
						$indented[] = $this->indentTree($value, ++$counter);
					} else {
						if(sizeof($value) > 0) {
							$indented[] = $this->indentTree($value, $counter);
						}
					}
				}	elseif($key == 'Category'){
					$indented[$value['id']] = ' '.$pre.' '.$value['name'];
				}	elseif(isset($value['Category']['name'])){
					$indented[] = $this->indentTree($value, $counter);	
				}
			}
			return $this->flatten_array($indented, 2);
		}
 
		function flatten_array($array, $preserve_keys = 0, &$out = array()) {
			foreach($array as $key => $child){
				if(is_array($child)){
					$out = $this->flatten_array($child, $preserve_keys, $out);
				} elseif($preserve_keys + is_string($key) > 1){
					$out[$key] = $child;
				} else {
					$out[] = $child;
				}
			}
			return $out;
		}
 
	}	
 
?>

var $helpers = array('Html', 'Form', 'Text', 'Javascript', 'Tree');

$categories = $this->Category->find('threaded', array('order' => array('Category.name' => 'ASC')));
$this->set('categoriesList', $categories);

echo $form->input('parent_id', array('type'=>'select', 'options'=>$tree->indentTree($categoriesList), 'empty'=>'--------', 'div'=>'row'));