Multilevel submenu codeigniter - php

Question

I have to extend an existing menu to a multilevel one. I am having a hard time wrapping my head around it so I'm hoping somebody can help me out.
First I've added another table in the database with the name parent_id.
Then I'd like to see if this column is filled out, so greater than > 0.
And then of course, check to see if id == parent_id.
If so, I'd like to display my submenu on hover of the parent item.
My current menu is a multi lang menu.
This is my current model:
var $default_order_by = array('position');
function findView($page)
{
$language = $this->config->item('language');
$p = new Page();
$p->where('url_' . $language, $page)->get();
return $p->view;
}
function findPageMenu($page)
{
$language = $this->config->item('language');
$p = new Page();
$p->where('url_' . $language, $page)->get();
return $p->menu;
}
function findAllByView()
{
$pages = new Page();
$result = array();
foreach ($pages->get() as $page)
$result[$page->view] = $page;
return $result;
}
function getMenu()
{
$pages = new Page();
if ($this->session->userdata('is_admin'))
return $pages->where('position >', 0)->get();
else
return $pages->where('position >', 0)->where('admin', 0)->get();
}
function getUrlByView($view)
{
$page = new Page();
$page->where('view', $view)->get();
$language = $this->config->item('language');
return $page->{'url_' . $language};
}
And this is my view:
<ul class="primary-nav">
<?php foreach($menu as $page): ?>
<li class="primary-nav__item">
<a class="primary-nav__link" <?php if ($page_menu == $page->view): ?>class="active" <?php endif; ?>href="<?php echo base_url() . $this->config->item('language_abbr') . '/' . $page->{'url_' . $this->config->item('language')}; ?>">
<?php echo mb_strtoupper($page->{'title_' . $this->config->item('language')}, 'UTF-8'); ?>
</a>
</li>
<?php endforeach; ?>
I was thinking of doing something like this:
function getSubMenu()
{
if ($this->session->userdata('is_admin'))
return $pages->where('position >', 0 && 'parent_id >', 0)->get();
else
// return $pages->where('position >', 0 && 'parent_id >', 0)->get();
echo '<h1> yay </h1>';
}
(ignore the yay, lol) But this obviously doesn't even begin to cut it.

Answer 1

Suggestion: You can add the "parent_id" in the same table. If there is a parent then fill it with parent id or with 0.
Answer: Get your data as a one dimentional array with all the rows with parent id. Then use the below function to create a multi dimensional array with parent and child.
function formatTree($tree, $parent = NULL) {
$treeArray = array();
foreach ($tree as $item) {
if ($item['menu_parent'] == 0) {
$treeArray[$item['menu_id']] = $item;
}
else {
$treeArray[$item['menu_parent']]['sub'][] = $item;
}
}
return $treeArray;
}
Now use the below function to make an intended ul-li list of parent-child menu
function buildMenu($menu_array, $is_sub = FALSE) {
$attr = (!$is_sub) ? ' class="sidebar-menu"' : ' class="treeview-menu"';
$menu = "<ul>"; // Open the menu container
foreach ($menu_array as $id => $properties) {
if (!isset($properties['sub'])) {
$is_sub = TRUE;
}
elseif (empty($properties['sub'])) {
$is_sub = TRUE;
}
foreach ($properties as $key => $val) {
if (is_array($val) && !empty($val)) {
$sub = $this -> buildMenu($val, TRUE);
}
else {
$sub = NULL;
$$key = $val;
}
}
if ($properties['menu_url']) {
$url = $properties['menu_url'];
}
$menu .= "<li>" . $menu_name . "</li>";
unset($url, $menu_name, $sub);
}
return $menu . "</ul>";
}
I am using this in my application. The array structure of menu data should be
array(
[0] => array(
'menu_name' => 'name',
'menu_url' => 'url',
'menu_id' => 'id',
'menu_parent' => 'parent id'
),
[1] => array(
'menu_name' => 'name',
'menu_url' => 'url',
'menu_id' => 'id',
'menu_parent' => 'parent id'
)
)