你需要创建自己的自定义遍历程序:
class wp_bootstrap_navwalker extends Walker_Nav_Menu {
function start_lvl( &$output, $depth ) {
$indent = str_repeat( "\t", $depth );
$output .= "\n$indent<ul class=\"dropdown-menu\">\n";
}
function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
global $wp_query;
$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
if (strcasecmp($item->title, 'divider') == 0) {
$output .= $indent . '<li class="divider">';
} else if (strcasecmp($item->title, 'divider-vertical') == 0) {
$output .= $indent . '<li class="divider-vertical">';
} else if (strcasecmp($item->title, 'nav-header') == 0) {
$output .= $indent . '<li class="nav-header">' . esc_attr( $item->attr_title );
} else {
$class_names = $value = '';
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$classes[] = ($item->current) ? 'active' : '';
$classes[] = 'menu-item-' . $item->ID;
$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
if ($args->has_children && $depth > 0) {
$class_names .= ' dropdown-submenu';
} else if($args->has_children && $depth === 0) {
$class_names .= ' dropdown';
}
$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );
$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';
$output .= $indent . '<li' . $id . $value . $class_names .'>';
$attributes = ! empty( $item->target ) ? ' target="' . esc_attr( $item->target ) .'"' : '';
$attributes .= ! empty( $item->xfn ) ? ' rel="' . esc_attr( $item->xfn ) .'"' : '';
$attributes .= ! empty( $item->url ) ? ' href="' . esc_attr( $item->url ) .'"' : '';
$attributes .= ($args->has_children) ? ' data-toggle="dropdown" data-target="'.esc_attr( $item->url).'" class="dropdown-toggle"' : '';
$item_output = $args->before;
if(! empty( $item->attr_title )){
$item_output .= '<a'. $attributes .'><i class="' . esc_attr( $item->attr_title ) . '"></i> ';
} else {
$item_output .= '<a'. $attributes .'>';
}
$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
$item_output .= ($args->has_children && $depth == 0) ? ' <span class="caret"></span></a>' : '</a>';
$item_output .= $args->after;
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
}
function display_element( $element, &$children_elements, $max_depth, $depth, $args, &$output ) {
if ( !$element ) {
return;
}
$id_field = $this->db_fields['id'];
if ( is_object( $args[0] ) ) {
$args[0]->has_children = ! empty( $children_elements[$element->$id_field] );
}
parent::display_element($element, $children_elements, $max_depth, $depth, $args, $output);
}
}
然后在你的主题中,你可以像这样做。
$args = array(
'theme_location' => 'secondary_navigation',
'container' => false,
'menu_id' => '',
'menu_class'=> 'nav navbar-nav',
'walker' => new wp_bootstrap_navwalker()
);
当然,这只是bootstrap walker的一个示例。