N-tier navigation in codeigniter - codeigniter

Question

How to create top navigation in code-igniter?

Answer 1

In controller I have declare a function and call model
private function getNavigation(){
$this->load->model('xx');
$data['nav'] = $this->xx->prepareTree();
$this->load->view('index',$data);
}
And In model I have declare three functions
public function prepareTree(){
$this->db->select("`catalog_parent` as parent_id, `catalog_name` as menu_item, `catalog_id` as id, `catalog_template` as pager_id");
$this->db->from("catalog_category");
$this->db->where("`catalog_navigation` = '1'");
$this->q = $this->db->get();
$create = '';
if ($this->q->num_rows() > 0) {
$create = $this->prepareList($this->q->result_array());
}
if(!empty($create)){
return $this->category_tree($create);
} else {
return '';
}
}
private function prepareList(array $items, $pid = 0) {
$output = array();
foreach ($items as $item) {
if ((int) $item['parent_id'] == $pid) {
if ($children = $this->prepareList($items, $item['id'])) {
$item['children'] = $children;
}
$output[] = $item;
}
}
return $output;
}
private function category_tree($menu_items, $child = false){
$output = '';
if (count($menu_items)>0) {
$output .= ($child === false) ? '<ul id="main-menu" class="sm sm-blue">' : '<ul>' ;
foreach ($menu_items as $item) {
$output .= '<li>';
$output .= ''.$item['menu_item'].'';
if (isset($item['children']) && count($item['children'])) {
$output .= $this->category_tree($item['children'], true);
}
$output .= '</li>';
}
$output .= '</ul>';
}
return $output;
}
If some suggest an more easy way please suggest us.
Thanks