From what I thought was a duplicate, we get a class to render the meta box in the Nav-Menus page.
Then I used this core function to render the meta box contents.
It works ok, but it’s displaying some notices and may need a good cleanup. It’s too much code to parse right now and I’ll leave it here as starting point. The modifications I’ve done involve the vars $post_type_name and $post_types_list. There’s a comment in the line that’s not working and displaying the notice in the View All tab.
add_action( 'admin_init', array( 'call_someClass', 'init' ) );
/**
* The Class
*/
class call_someClass {
const LANG = 'exch_lang';
public static function init() {
$class = __CLASS__;
new $class;
}
public function __construct() {
global $pagenow;
// Abort if not on the nav-menus.php admin UI page - avoid adding elsewhere
if ( 'nav-menus.php' !== $pagenow )
return;
$this->add_some_meta_box();
}
/**
* Adds the meta box container
*/
public function add_some_meta_box(){
add_meta_box(
'info_meta_box_'
,__( 'Example metabox', self::LANG )
,array( $this, 'render_meta_box_content' )
,'nav-menus' // important !!!
,'side' // important, only side seems to work!!!
,'high'
);
}
/**
* Render Meta Box content
*/
public function render_meta_box_content() {
global $_nav_menu_placeholder, $nav_menu_selected_id;
$post_type_name="all-cpts";
$post_types_list = array_keys(get_post_types( array( 'show_in_nav_menus' => true ), 'array' ));
// paginate browsing for large numbers of post objects
$per_page = 50;
$pagenum = isset( $_REQUEST[$post_type_name . '-tab'] ) && isset( $_REQUEST['paged'] ) ? absint( $_REQUEST['paged'] ) : 1;
$offset = 0 < $pagenum ? $per_page * ( $pagenum - 1 ) : 0;
$args = array(
'offset' => $offset,
'order' => 'ASC',
'orderby' => 'title',
'posts_per_page' => $per_page,
'post_type' => $post_types_list,
'suppress_filters' => true,
'update_post_term_cache' => false,
'update_post_meta_cache' => false
);
if ( isset( $post_type['args']->_default_query ) )
$args = array_merge($args, (array) $post_type['args']->_default_query );
// @todo transient caching of these results with proper invalidation on updating of a post of this type
$get_posts = new WP_Query;
$posts = $get_posts->query( $args );
if ( ! $get_posts->post_count ) {
echo '<p>' . __( 'No items.' ) . '</p>';
return;
}
$post_type_object = get_post_type_object($post_type_name);
$num_pages = $get_posts->max_num_pages;
$page_links = paginate_links( array(
'base' => add_query_arg(
array(
$post_type_name . '-tab' => 'all',
'paged' => '%#%',
'item-type' => 'post_type',
'item-object' => $post_type_name,
)
),
'format' => '',
'prev_text' => __('«'),
'next_text' => __('»'),
'total' => $num_pages,
'current' => $pagenum
));
if ( !$posts )
$error="<li id="error">". $post_type['args']->labels->not_found .'</li>';
$db_fields = false;
if ( is_post_type_hierarchical( $post_type_name ) ) {
$db_fields = array( 'parent' => 'post_parent', 'id' => 'ID' );
}
$walker = new Walker_Nav_Menu_Checklist( $db_fields );
$current_tab = 'most-recent';
if ( isset( $_REQUEST[$post_type_name . '-tab'] ) && in_array( $_REQUEST[$post_type_name . '-tab'], array('all', 'search') ) ) {
$current_tab = $_REQUEST[$post_type_name . '-tab'];
}
if ( ! empty( $_REQUEST['quick-search-posttype-' . $post_type_name] ) ) {
$current_tab = 'search';
}
$removed_args = array(
'action',
'customlink-tab',
'edit-menu-item',
'menu-item',
'page-tab',
'_wpnonce',
);
?>
<div id="posttype-<?php echo $post_type_name; ?>" class="posttypediv">
<ul id="posttype-<?php echo $post_type_name; ?>-tabs" class="posttype-tabs add-menu-item-tabs">
<li <?php echo ( 'most-recent' == $current_tab ? ' class="tabs"' : '' ); ?>><a class="nav-tab-link" href="https://wordpress.stackexchange.com/questions/100395/<?php if ( $nav_menu_selected_id ) echo esc_url(add_query_arg($post_type_name ."-tab', 'most-recent', remove_query_arg($removed_args))); ?>#tabs-panel-posttype-<?php echo $post_type_name; ?>-most-recent"><?php _e('Most Recent'); ?></a></li>
<li <?php echo ( 'all' == $current_tab ? ' class="tabs"' : '' ); ?>><a class="nav-tab-link" href="https://wordpress.stackexchange.com/questions/100395/<?php if ( $nav_menu_selected_id ) echo esc_url(add_query_arg($post_type_name ."-tab', 'all', remove_query_arg($removed_args))); ?>#<?php echo $post_type_name; ?>-all"><?php _e('View All'); ?></a></li>
<li <?php echo ( 'search' == $current_tab ? ' class="tabs"' : '' ); ?>><a class="nav-tab-link" href="https://wordpress.stackexchange.com/questions/100395/<?php if ( $nav_menu_selected_id ) echo esc_url(add_query_arg($post_type_name ."-tab', 'search', remove_query_arg($removed_args))); ?>#tabs-panel-posttype-<?php echo $post_type_name; ?>-search"><?php _e('Search'); ?></a></li>
</ul>
<div id="tabs-panel-posttype-<?php echo $post_type_name; ?>-most-recent" class="tabs-panel <?php
echo ( 'most-recent' == $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' );
?>">
<ul id="<?php echo $post_type_name; ?>checklist-most-recent" class="categorychecklist form-no-clear">
<?php
$recent_args = array_merge( $args, array( 'orderby' => 'post_date', 'order' => 'DESC', 'posts_per_page' => 15 ) );
$most_recent = $get_posts->query( $recent_args );
$args['walker'] = $walker;
echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', $most_recent), 0, (object) $args );
?>
</ul>
</div><!-- /.tabs-panel -->
<div class="tabs-panel <?php
echo ( 'search' == $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' );
?>" id="tabs-panel-posttype-<?php echo $post_type_name; ?>-search">
<?php
if ( isset( $_REQUEST['quick-search-posttype-' . $post_type_name] ) ) {
$searched = esc_attr( $_REQUEST['quick-search-posttype-' . $post_type_name] );
$search_results = get_posts( array( 's' => $searched, 'post_type' => $post_types_list, 'fields' => 'all', 'order' => 'DESC', ) );
} else {
$searched = '';
$search_results = array();
}
?>
<p class="quick-search-wrap">
<input type="search" class="quick-search input-with-default-title" title="<?php esc_attr_e('Search'); ?>" value="<?php echo $searched; ?>" name="quick-search-posttype-<?php echo $post_type_name; ?>" />
<span class="spinner"></span>
<?php submit_button( __( 'Search' ), 'button-small quick-search-submit button-secondary hide-if-js', 'submit', false, array( 'id' => 'submit-quick-search-posttype-' . $post_type_name ) ); ?>
</p>
<ul id="<?php echo $post_type_name; ?>-search-checklist" data-wp-lists="list:<?php echo $post_type_name?>" class="categorychecklist form-no-clear">
<?php if ( ! empty( $search_results ) && ! is_wp_error( $search_results ) ) : ?>
<?php
$args['walker'] = $walker;
echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', $search_results), 0, (object) $args );
?>
<?php elseif ( is_wp_error( $search_results ) ) : ?>
<li><?php echo $search_results->get_error_message(); ?></li>
<?php elseif ( ! empty( $searched ) ) : ?>
<li><?php _e('No results found.'); ?></li>
<?php endif; ?>
</ul>
</div><!-- /.tabs-panel -->
<div id="<?php echo $post_type_name; ?>-all" class="tabs-panel tabs-panel-view-all <?php
echo ( 'all' == $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' );
?>">
<?php if ( ! empty( $page_links ) ) : ?>
<div class="add-menu-item-pagelinks">
<?php echo $page_links; ?>
</div>
<?php endif; ?>
<ul id="<?php echo $post_type_name; ?>checklist" data-wp-lists="list:<?php echo $post_type_name?>" class="categorychecklist form-no-clear">
<?php
$args['walker'] = $walker;
// if we're dealing with pages, let's put a checkbox for the front page at the top of the list
if ( 'page' == $post_type_name ) {
$front_page="page" == get_option('show_on_front') ? (int) get_option( 'page_on_front' ) : 0;
if ( ! empty( $front_page ) ) {
$front_page_obj = get_post( $front_page );
$front_page_obj->front_or_home = true;
array_unshift( $posts, $front_page_obj );
} else {
$_nav_menu_placeholder = ( 0 > $_nav_menu_placeholder ) ? intval($_nav_menu_placeholder) - 1 : -1;
array_unshift( $posts, (object) array(
'front_or_home' => true,
'ID' => 0,
'object_id' => $_nav_menu_placeholder,
'post_content' => '',
'post_excerpt' => '',
'post_parent' => '',
'post_title' => _x('Home', 'nav menu home label'),
'post_type' => 'nav_menu_item',
'type' => 'custom',
'url' => home_url("https://wordpress.stackexchange.com/"),
) );
}
}
// THIS HAS TO BE FIXED <----------
$posts = apply_filters( 'nav_menu_items_'.$post_type_name, $posts, $args, $post_type );
$checkbox_items = walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', $posts), 0, (object) $args );
if ( 'all' == $current_tab && ! empty( $_REQUEST['selectall'] ) ) {
$checkbox_items = preg_replace('/(type=(.)checkbox(\2))/', '$1 checked=$2checked$2', $checkbox_items);
}
echo $checkbox_items;
?>
</ul>
<?php if ( ! empty( $page_links ) ) : ?>
<div class="add-menu-item-pagelinks">
<?php echo $page_links; ?>
</div>
<?php endif; ?>
</div><!-- /.tabs-panel -->
<p class="button-controls">
<span class="list-controls">
<a href="<?php
echo esc_url(add_query_arg(
array(
$post_type_name . '-tab' => 'all',
'selectall' => 1,
),
remove_query_arg($removed_args)
));
?>#posttype-<?php echo $post_type_name; ?>" class="select-all"><?php _e('Select All'); ?></a>
</span>
<span class="add-to-menu">
<input type="submit"<?php disabled( $nav_menu_selected_id, 0 ); ?> class="button-secondary submit-add-to-menu right" value="<?php esc_attr_e('Add to Menu'); ?>" name="add-post-type-menu-item" id="submit-posttype-<?php echo $post_type_name; ?>" />
<span class="spinner"></span>
</span>
</p>
</div><!-- /.posttypediv -->
<?php
}
}