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A basic plugin showing how to add menu metaboxes to admin menu page
<?php
/**
* @package Custom_menu_admin
* @version 1.0
*/
/*
Plugin Name: Custom menu admin
Plugin URI: http://wordpress.org/extend/plugins/#
Description: This is an example plugin
Author: Carlo Daniele
Version: 1.0
Author URI: http://carlodaniele.it/en/
*/
/**
* Add menu meta box
*
* @param object $object The meta box object
* @link https://developer.wordpress.org/reference/functions/add_meta_box/
*/
function custom_add_menu_meta_box( $object ) {
add_meta_box( 'custom-menu-metabox', __( 'Authors' ), 'custom_menu_meta_box', 'nav-menus', 'side', 'default' );
return $object;
}
add_filter( 'nav_menu_meta_box_object', 'custom_add_menu_meta_box', 10, 1);
/**
* Displays a metabox for authors menu item.
*
* @global int|string $nav_menu_selected_id (id, name or slug) of the currently-selected menu
*
* @link https://core.trac.wordpress.org/browser/tags/4.5/src/wp-admin/includes/nav-menu.php
* @link https://core.trac.wordpress.org/browser/tags/4.5/src/wp-admin/includes/class-walker-nav-menu-edit.php
* @link https://core.trac.wordpress.org/browser/tags/4.5/src/wp-admin/includes/class-walker-nav-menu-checklist.php
*/
function custom_menu_meta_box(){
global $nav_menu_selected_id;
$walker = new Walker_Nav_Menu_Checklist();
$current_tab = 'all';
$authors = get_users( array( 'orderby' => 'nicename', 'order' => 'ASC', 'who' => 'authors' ) );
$admins = array();
if ( isset( $_REQUEST['authorarchive-tab'] ) && 'admins' == $_REQUEST['authorarchive-tab'] ) {
$current_tab = 'admins';
}elseif ( isset( $_REQUEST['authorarchive-tab'] ) && 'all' == $_REQUEST['authorarchive-tab'] ) {
$current_tab = 'all';
}
/* set values to required item properties */
foreach ( $authors as &$author ) {
$author->classes = array();
$author->type = 'custom';
$author->object_id = $author->ID;
$author->title = $author->nickname . ' - ' . implode(', ', $author->roles);
$author->object = 'custom';
$author->url = get_author_posts_url( $author->ID );
$author->attr_title = $author->displayname;
if( $author->has_cap( 'edit_users' ) ){
$admins[] = $author;
}
}
$removed_args = array( 'action', 'customlink-tab', 'edit-menu-item', 'menu-item', 'page-tab', '_wpnonce' );
?>
<div id="authorarchive" class="categorydiv">
<ul id="authorarchive-tabs" class="authorarchive-tabs add-menu-item-tabs">
<li <?php echo ( 'all' == $current_tab ? ' class="tabs"' : '' ); ?>>
<a class="nav-tab-link" data-type="tabs-panel-authorarchive-all" href="<?php if ( $nav_menu_selected_id ) echo esc_url( add_query_arg( 'authorarchive-tab', 'all', remove_query_arg( $removed_args ) ) ); ?>#tabs-panel-authorarchive-all">
<?php _e( 'View All' ); ?>
</a>
</li><!-- /.tabs -->
<li <?php echo ( 'admins' == $current_tab ? ' class="tabs"' : '' ); ?>>
<a class="nav-tab-link" data-type="tabs-panel-authorarchive-admins" href="<?php if ( $nav_menu_selected_id ) echo esc_url( add_query_arg( 'authorarchive-tab', 'admins', remove_query_arg( $removed_args ) ) ); ?>#tabs-panel-authorarchive-admins">
<?php _e( 'Admins' ); ?>
</a>
</li><!-- /.tabs -->
</ul>
<div id="tabs-panel-authorarchive-all" class="tabs-panel tabs-panel-view-all <?php echo ( 'all' == $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' ); ?>">
<ul id="authorarchive-checklist-all" class="categorychecklist form-no-clear">
<?php
echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', $authors), 0, (object) array( 'walker' => $walker) );
?>
</ul>
</div><!-- /.tabs-panel -->
<div id="tabs-panel-authorarchive-admins" class="tabs-panel tabs-panel-view-admins <?php echo ( 'admins' == $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' ); ?>">
<ul id="authorarchive-checklist-admins" class="categorychecklist form-no-clear">
<?php
echo walk_nav_menu_tree( array_map('wp_setup_nav_menu_item', $admins), 0, (object) array( 'walker' => $walker) );
?>
</ul>
</div><!-- /.tabs-panel -->
<p class="button-controls wp-clearfix">
<span class="list-controls">
<a href="<?php echo esc_url( add_query_arg( array( 'authorarchive-tab' => 'all', 'selectall' => 1, ), remove_query_arg( $removed_args ) )); ?>#authorarchive" class="select-all"><?php _e('Select All'); ?></a>
</span>
<span class="add-to-menu">
<input type="submit"<?php wp_nav_menu_disabled_check( $nav_menu_selected_id ); ?> class="button-secondary submit-add-to-menu right" value="<?php esc_attr_e('Add to Menu'); ?>" name="add-authorarchive-menu-item" id="submit-authorarchive" />
<span class="spinner"></span>
</span>
</p>
</div><!-- /.categorydiv -->
<?php
}
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