Custom Menu in Sidebar Wordpress - wordpress

Question

I've a problem to show a Custom Menu in sidebar.
Now, I've created a Menu from WordPress back-end. this menu must be showed in sidebar of my template, with menu name (i.e. CUSTOM MENU) and the structure with parents and child.
My target is this.
At the moment, I've this part of code:
$meta_box_menu = array(
'id' => 'custom-meta-menu',
'title' => 'Menu Sidebar',
'page' => 'page',
'context' => 'side',
'priority' => 'high',
'fields' => array(
array(
'id' => 'custom-meta-menu-name',
'type' => 'select',
'std' => 'none'
),
),
);
/*
* This function will register the meta box with WordPress
*/
function custom_add_box() {
global $meta_box_menu;
add_meta_box($meta_box_menu['id'], $meta_box_menu['title'], 'custom_meta_menu_html',
$meta_box_menu['page'], $meta_box_menu['context'], $meta_box_menu['priority']);
}
add_action('admin_init', 'custom_add_box');
/*
* This function will produce the html needed to display our meta box in the admin area
*/
function custom_meta_menu_html() {
global $meta_box_menu, $post;
$output = '<p style="padding:10px 0 0 0;">'.__('Scegli il menu da mostrare nella Sidebar di questa pagina.', 'custom').'</p>';
$output .= '<input type="hidden" name="sf_meta_box_nonce" value="'.
wp_create_nonce(basename(__FILE__)). '" />';
$output .= '<table class="form-table">';
foreach ($meta_box_menu['fields'] as $field) {
$meta = get_post_meta($post->ID, $field['id'], true);
/*
* Get out all our menus using the function from functions.php
*/
$menus = custom_get_all_menus();
/*
* Grab out saved data for edit mode
*/
$meta = get_post_meta($post->ID, $field['id'], true);
$output .= '<select name="'.$field['id'].'" class="widefat">';
$output .= '<option value="none">- none -</option>';
if(is_array($menus)):
foreach($menus as $k => $v):
if($meta==$v->slug):
$output .= '<option selected="selected" value="' . $v->slug .'">' . $v->name . '</option>';
else:
$output .= '<option value="' . $v->slug .'">' . $v->name . '</option>';
endif;
endforeach;
endif;
$output .= '</select>';
}
$output .= '</table>';
echo $output;
}
/*
* This function will save our preferences into the database
*/
function custom_save_data($post_id) {
global $meta_box, $meta_box_menu;
foreach ($meta_box_menu['fields'] as $field) {
$old = get_post_meta($post_id, $field['id'], true);
$new = $_POST[$field['id']];
if ($new && $new != $old) {
update_post_meta($post_id, $field['id'], stripslashes(htmlspecialchars($new)));
} elseif ('' == $new && $old) {
delete_post_meta($post_id, $field['id'], $old);
}
}
}
add_action('save_post', 'custom_save_data');
function custom_get_all_menus() {
$menu_obj = get_terms( 'nav_menu' );
return $menu_obj;
}
/*
* Html Custom Sidebar Menu
*/
function custom_generate_menu_from_items($items) {
if(count($items)>0):
$menu_list = '<aside class="widget sidebar_menu"><h5 class="widget-title">' .'CUSTOM MENU'. '</h5><nav><ul class="sidebar-menu-items">';
foreach ( (array) $items as $key => $menu_item ) {
$title = $menu_item->title;
$url = $menu_item->url;
$menu_list .= '<li>' . $title . '</li>';
}
$menu_list .= '</ul></nav></aside>';
return $menu_list;
$menu_item->title = get_post_meta( $menu_item->ID, '_menu_item_title', true );
return $menu_item;
endif;
add_filter( 'wp_get_nav_menu_items', 'custom_generate_menu_from_items', null, 3 );
}
With this code, the menu is showed in output page but the pages are placed in the same level, without parent child relationship.
How can I keep this relationship?
Thank you your support.

Answer 1

There is no logic in there that checks the relationships, I'd say
var_dump($items);
somewhere and see if there is some field pertaining to the relationships of the menu items. Probably something looking like "parentId" or along those lines.
If it's not there, then you'll have to query them yourself.
Once you have them, you can check if it has a parentId, and handle the formatting that way. This will get a little tricky if it nest down more than one level, because you'd have to start checking if the parent has a parent and handle the formatting for all those different cases