'active',
'nav-item' => 'nav-item',
'nav-link' => 'nav-link',
'dropdown' => 'dropdown',
'dropdown-menu' => 'dropdown-menu',
'dropdown-item' => 'dropdown-item',
'dropdown-toggle' => 'dropdown-toggle',
), $name, $args, $item );
return $r[ $name ];
}
/**
* Starts the list before the elements are added.
*
* @see Walker::start_lvl()
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of arguments. @see wp_nav_menu().
*/
public function start_lvl( &$output, $depth = 0, $args = array() ) {
$class_name = $this->bs4_nav_class( 'dropdown-menu', $args );
$indent = str_repeat( "\t", $depth );
$output .= "\n$indent\n";
}
/**
* Ends the list of after the elements are added.
*
* @see Walker::end_lvl()
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of arguments. @see wp_nav_menu().
*/
public function end_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat( "\t", $depth );
$output .= "$indent
\n";
}
/**
* Start the element output.
*
* @see Walker::start_el()
*
* @param string $output Passed by reference. Used to append additional content.
* @param object $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of arguments. @see wp_nav_menu().
* @param int $id Current item ID.
*/
public function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
// Indent HTML output per item depth.
$indent = $depth ? str_repeat( "\t", $depth ) : '';
// Check if nav item classes exist.
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
// Add 'menu-item-##' class.
$classes[] = 'menu-item-' . $item->ID;
// Add 'nav-item' class.
$classes[] = $this->bs4_nav_class( 'nav-item', $args, $item );
// If there's children items then add 'dropdown' class.
if ( in_array( 'menu-item-has-children', $classes, true ) ) {
$classes[] = $this->bs4_nav_class( 'dropdown', $args, $item );
}
// If active item (current page) then add 'active' class.
if ( in_array( 'current-menu-item', $classes, true ) ) {
$classes[] = $this->bs4_nav_class( 'active', $args, $item );
}
/**
* Filter the CSS class(es) applied to a menu item's list item element.
*
* @param array $classes The CSS classes that are applied to the menu item's `` element.
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args, $depth ) );
// Check if new classes exist before sanitizing and HTML output.
$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
/**
* Filter the ID applied to a menu item's list item element.
*
* @param string $menu_id The ID that is applied to the menu item's `` element.
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$id = apply_filters( 'nav_menu_item_id', 'menu-item-' . $item->ID, $item, $args, $depth );
$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';
// Nav list item HTML output if parent.
if ( 0 === $depth ) {
$output .= $indent . '';
}
$atts = array();
$atts['title'] = ! empty( $item->attr_title ) ? $item->attr_title : '';
$atts['target'] = ! empty( $item->target ) ? $item->target : '';
$atts['rel'] = ! empty( $item->xfn ) ? $item->xfn : '';
$atts['href'] = ! empty( $item->url ) ? $item->url : '';
// Add new class to nav list item links.
if ( 0 === $depth ) {
$atts['class'] = $this->bs4_nav_class( 'nav-link', $args, $item );
}
if ( 0 === $depth && in_array( 'menu-item-has-children', $classes, true ) ) {
$atts['class'] .= ' ' . $this->bs4_nav_class( 'dropdown-toggle', $args, $item );
$atts['data-toggle'] = 'dropdown';
}
if ( $depth > 0 ) {
$atts['class'] = $this->bs4_nav_class( 'dropdown-item', $args, $item );
}
if ( in_array( 'current-menu-item', $item->classes, true ) ) {
$atts['class'] .= ' ' . $this->bs4_nav_class( 'active', $args, $item );
}
/**
* Filter the HTML attributes applied to a menu item's anchor element.
*
* @param array $atts {
* The HTML attributes applied to the menu item's `` element, empty strings are ignored.
*
* @type string $title Title attribute.
* @type string $target Target attribute.
* @type string $rel The rel attribute.
* @type string $href The href attribute.
* }
* @param object $item The current menu item.
* @param array $args An array of {@see wp_nav_menu()} arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$atts = apply_filters( 'nav_menu_link_attributes', $atts, $item, $args, $depth );
$attributes = '';
foreach ( $atts as $attr => $value ) {
if ( ! empty( $value ) ) {
$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
$attributes .= ' ' . $attr . '="' . $value . '"';
}
}
$item_output = $args->before;
$item_output .= '';
/** This filter is documented in wp-includes/post-template.php */
$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
$item_output .= '';
$item_output .= $args->after;
/**
* Filter a menu item's starting output.
*
* The menu item's starting output only includes `$args->before`, the opening ``,
* the menu item's title, the closing ``, and `$args->after`. Currently, there is
* no filter for modifying the opening and closing `` for a menu item.
*
* @param string $item_output The menu item's starting HTML output.
* @param object $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
* @param array $args An array of {@see wp_nav_menu()} arguments.
*/
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
/**
* Ends the element output, if needed.
*
* @see Walker::end_el()
*
* @param string $output Passed by reference. Used to append additional content.
* @param object $item Page data object. Not used.
* @param int $depth Depth of page. Not Used.
* @param array $args An array of arguments. @see wp_nav_menu().
*/
public function end_el( &$output, $item, $depth = 0, $args = array() ) {
if ( isset( $args->has_children ) && 0 === $depth ) {
$output .= "\n";
}
}
}