有时候我们需要在菜单里加入额外的一些元素，可以用Walker_Nav_Menu类来完成。
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class description_walker extends Walker_Nav_Menu { function start_el(&$output, $item, $depth, $args) { global $wp_query; global $wpdb; $indent = ( $depth ) ? str_repeat( "t", $depth ) : ''; $class_names = $value = ''; $classes = empty( $item->classes ) ? array() : (array) $item->classes; $classes[] = 'menu-item-' . $item->ID; $class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) ); $class_names = ' class="' . esc_attr( $class_names ) . '"'; $id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args ); $id = strlen( $id ) ? ' id="' . esc_attr( $id ) . '"' : ''; $output .= $indent . '<li' . $id . $value . $class_names .'>'; $prepend = ''; $append = ''; $description = ! empty( $item->attr_title ) ? '' . esc_attr( $item->attr_title ) . '' : ''; if($depth != 0) { $description = $append = $prepend = ""; $attributes = ! empty( $item->attr_title ) ? ' title="' . esc_attr( $item->attr_title ) .'"' : ''; } $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 ) .'"' : ''; $item_output = $args->before; $item_output .= '<a'. $attributes .'><i class="'.$description.'"></i>'; $item_output .= $args->link_before . $prepend . apply_filters( 'the_title', $item->title, $item->ID ) . $append; $item_output .= $args->link_after; $has_children = $wpdb -> get_var( "SELECT COUNT(meta_id) FROM {$wpdb->prefix}postmeta WHERE meta_key='_menu_item_menu_item_parent' AND meta_value='" . $item->ID . "'" ); if ($has_children > 0) { //如果有二级菜单 $item_output .= '<span class="arrow"></span>'; } $item_output .= '</a>'; $item_output .= $args->after; $output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args ); } } |
给当前菜单添加class
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function special_nav_class($classes, $item){ if( in_array('current-menu-item', $classes) || in_array('current-menu-ancestor', $classes) || in_array('current-post-parent', $classes) || in_array('current-post-ancestor', $classes)){ $classes[] = 'active '; } return $classes; } add_filter('nav_menu_css_class' , 'special_nav_class' , 10 , 2); |
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