wp_nav_menu_item_taxonomy_meta_box()

wp_nav_menu_item_taxonomy_meta_box( string $data_object, array $box )

function wp_nav_menu_item_taxonomy_meta_box( $data_object, $box ) {
	global $nav_menu_selected_id;

	$taxonomy_name = $box['args']->name;
	$taxonomy      = get_taxonomy( $taxonomy_name );
	$tab_name      = $taxonomy_name . '-tab';

	// Paginate browsing for large numbers of objects.
	$per_page = 50;
	$pagenum  = isset( $_REQUEST[ $tab_name ] ) && isset( $_REQUEST['paged'] ) ? absint( $_REQUEST['paged'] ) : 1;
	$offset   = 0 < $pagenum ? $per_page * ( $pagenum - 1 ) : 0;

	$args = array(
		'taxonomy'     => $taxonomy_name,
		'child_of'     => 0,
		'exclude'      => '',
		'hide_empty'   => false,
		'hierarchical' => 1,
		'include'      => '',
		'number'       => $per_page,
		'offset'       => $offset,
		'order'        => 'ASC',
		'orderby'      => 'name',
		'pad_counts'   => false,
	);

	$terms = get_terms( $args );

	if ( ! $terms || is_wp_error( $terms ) ) {
		echo '<p>' . __( 'No items.' ) . '</p>';
		return;
	}

	$num_pages = (int) ceil(
		(int) wp_count_terms(
			array_merge(
				$args,
				array(
					'number' => '',
					'offset' => '',
				)
			)
		) / $per_page
	);

	$page_links = paginate_links(
		array(
			'base'               => add_query_arg(
				array(
					$tab_name     => 'all',
					'paged'       => '%#%',
					'item-type'   => 'taxonomy',
					'item-object' => $taxonomy_name,
				)
			),
			'format'             => '',
			'prev_text'          => '<span aria-label="' . esc_attr__( 'Previous page' ) . '">' . __( '«' ) . '</span>',
			'next_text'          => '<span aria-label="' . esc_attr__( 'Next page' ) . '">' . __( '»' ) . '</span>',
			/* translators: Hidden accessibility text. */
			'before_page_number' => '<span class="screen-reader-text">' . __( 'Page' ) . '</span> ',
			'total'              => $num_pages,
			'current'            => $pagenum,
		)
	);

	$db_fields = false;
	if ( is_taxonomy_hierarchical( $taxonomy_name ) ) {
		$db_fields = array(
			'parent' => 'parent',
			'id'     => 'term_id',
		);
	}

	$walker = new Walker_Nav_Menu_Checklist( $db_fields );

	$current_tab = 'most-used';

	if ( isset( $_REQUEST[ $tab_name ] ) && in_array( $_REQUEST[ $tab_name ], array( 'all', 'most-used', 'search' ), true ) ) {
		$current_tab = $_REQUEST[ $tab_name ];
	}

	if ( ! empty( $_REQUEST[ "quick-search-taxonomy-{$taxonomy_name}" ] ) ) {
		$current_tab = 'search';
	}

	$removed_args = array(
		'action',
		'customlink-tab',
		'edit-menu-item',
		'menu-item',
		'page-tab',
		'_wpnonce',
	);

	$most_used_url = '';
	$view_all_url  = '';
	$search_url    = '';

	if ( $nav_menu_selected_id ) {
		$most_used_url = add_query_arg( $tab_name, 'most-used', remove_query_arg( $removed_args ) );
		$view_all_url  = add_query_arg( $tab_name, 'all', remove_query_arg( $removed_args ) );
		$search_url    = add_query_arg( $tab_name, 'search', remove_query_arg( $removed_args ) );
	}
	?>
	<div id="<?php echo esc_attr( "taxonomy-{$taxonomy_name}" ); ?>" class="taxonomydiv">
		<ul id="<?php echo esc_attr( "taxonomy-{$taxonomy_name}-tabs" ); ?>" class="taxonomy-tabs add-menu-item-tabs">
			<li <?php echo ( 'most-used' === $current_tab ? ' class="tabs"' : '' ); ?>>
				<a class="nav-tab-link"
					data-type="<?php echo esc_attr( "tabs-panel-{$taxonomy_name}-pop" ); ?>"
					href="<?php echo esc_url( $most_used_url . "#tabs-panel-{$taxonomy_name}-pop" ); ?>"
				>
					<?php echo esc_html( $taxonomy->labels->most_used ); ?>
				</a>
			</li>
			<li <?php echo ( 'all' === $current_tab ? ' class="tabs"' : '' ); ?>>
				<a class="nav-tab-link"
					data-type="<?php echo esc_attr( "tabs-panel-{$taxonomy_name}-all" ); ?>"
					href="<?php echo esc_url( $view_all_url . "#tabs-panel-{$taxonomy_name}-all" ); ?>"
				>
					<?php _e( 'View All' ); ?>
				</a>
			</li>
			<li <?php echo ( 'search' === $current_tab ? ' class="tabs"' : '' ); ?>>
				<a class="nav-tab-link"
					data-type="<?php echo esc_attr( "tabs-panel-search-taxonomy-{$taxonomy_name}" ); ?>"
					href="<?php echo esc_url( $search_url . "#tabs-panel-search-taxonomy-{$taxonomy_name}" ); ?>"
				>
					<?php _e( 'Search' ); ?>
				</a>
			</li>
		</ul><!-- .taxonomy-tabs -->

		<div id="<?php echo esc_attr( "tabs-panel-{$taxonomy_name}-pop" ); ?>"
			class="tabs-panel <?php echo ( 'most-used' === $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' ); ?>"
			role="region" aria-label="<?php echo esc_attr( $taxonomy->labels->most_used ); ?>" tabindex="0"
		>
			<ul id="<?php echo esc_attr( "{$taxonomy_name}checklist-pop" ); ?>"
				class="categorychecklist form-no-clear"
			>
				<?php
				$popular_terms = get_terms(
					array(
						'taxonomy'     => $taxonomy_name,
						'orderby'      => 'count',
						'order'        => 'DESC',
						'number'       => 10,
						'hierarchical' => false,
					)
				);

				$args['walker'] = $walker;
				echo walk_nav_menu_tree(
					array_map( 'wp_setup_nav_menu_item', $popular_terms ),
					0,
					(object) $args
				);
				?>
			</ul>
		</div><!-- /.tabs-panel -->

		<div id="<?php echo esc_attr( "tabs-panel-{$taxonomy_name}-all" ); ?>"
			class="tabs-panel tabs-panel-view-all <?php echo ( 'all' === $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' ); ?>"
			role="region" aria-label="<?php echo esc_attr( $taxonomy->labels->all_items ); ?>" tabindex="0"
		>
			<?php if ( ! empty( $page_links ) ) : ?>
				<div class="add-menu-item-pagelinks">
					<?php echo $page_links; ?>
				</div>
			<?php endif; ?>

			<ul id="<?php echo esc_attr( "{$taxonomy_name}checklist" ); ?>"
				data-wp-lists="<?php echo esc_attr( "list:{$taxonomy_name}" ); ?>"
				class="categorychecklist form-no-clear"
			>
				<?php
				$args['walker'] = $walker;
				echo walk_nav_menu_tree(
					array_map( 'wp_setup_nav_menu_item', $terms ),
					0,
					(object) $args
				);
				?>
			</ul>

			<?php if ( ! empty( $page_links ) ) : ?>
				<div class="add-menu-item-pagelinks">
					<?php echo $page_links; ?>
				</div>
			<?php endif; ?>
		</div><!-- /.tabs-panel -->

		<div id="<?php echo esc_attr( "tabs-panel-search-taxonomy-{$taxonomy_name}" ); ?>"
			class="tabs-panel <?php echo ( 'search' === $current_tab ? 'tabs-panel-active' : 'tabs-panel-inactive' ); ?>"
			role="region" aria-label="<?php echo esc_attr( $taxonomy->labels->search_items ); ?>" tabindex="0">
			<?php
			if ( isset( $_REQUEST[ "quick-search-taxonomy-{$taxonomy_name}" ] ) ) {
				$searched       = esc_attr( $_REQUEST[ "quick-search-taxonomy-{$taxonomy_name}" ] );
				$search_results = get_terms(
					array(
						'taxonomy'     => $taxonomy_name,
						'name__like'   => $searched,
						'fields'       => 'all',
						'orderby'      => 'count',
						'order'        => 'DESC',
						'hierarchical' => false,
					)
				);
			} else {
				$searched       = '';
				$search_results = array();
			}
			?>
			<p class="quick-search-wrap">
				<label for="<?php echo esc_attr( "quick-search-taxonomy-{$taxonomy_name}" ); ?>" class="screen-reader-text">
					<?php
					/* translators: Hidden accessibility text. */
					_e( 'Search' );
					?>
				</label>
				<input type="search"
					class="quick-search" value="<?php echo $searched; ?>"
					name="<?php echo esc_attr( "quick-search-taxonomy-{$taxonomy_name}" ); ?>"
					id="<?php echo esc_attr( "quick-search-taxonomy-{$taxonomy_name}" ); ?>"
				/>
				<span class="spinner"></span>
				<?php
				submit_button(
					__( 'Search' ),
					'small quick-search-submit hide-if-js',
					'submit',
					false,
					array( 'id' => "submit-quick-search-taxonomy-{$taxonomy_name}" )
				);
				?>
			</p>

			<ul id="<?php echo esc_attr( "{$taxonomy_name}-search-checklist" ); ?>"
				data-wp-lists="<?php echo esc_attr( "list:{$taxonomy_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 -->

		<p class="button-controls" data-items-type="<?php echo esc_attr( "taxonomy-{$taxonomy_name}" ); ?>">
			<span class="list-controls hide-if-no-js">
				<input type="checkbox"<?php wp_nav_menu_disabled_check( $nav_menu_selected_id ); ?>
					id="<?php echo esc_attr( $tab_name ); ?>" class="select-all"
				/>
				<label for="<?php echo esc_attr( $tab_name ); ?>"><?php _e( 'Select All' ); ?></label>
			</span>

			<span class="add-to-menu">
				<input type="submit"<?php wp_nav_menu_disabled_check( $nav_menu_selected_id ); ?>
					class="button submit-add-to-menu right" value="<?php esc_attr_e( 'Add to Menu' ); ?>"
					name="add-taxonomy-menu-item" id="<?php echo esc_attr( "submit-taxonomy-{$taxonomy_name}" ); ?>"
				/>
				<span class="spinner"></span>
			</span>
		</p>

	</div><!-- /.taxonomydiv -->
	<?php
}