如何解决如果有级别 2，则将唯一类添加到级别 0
我真的需要你的帮助来解决我的问题。
我正在尝试使用 Walker 自定义 Wordpress 菜单。
我的任务是在 0 级找出 2 级是否存在。如果级别 2 存在，那么我需要添加一个唯一的类。
我唯一能找到的就是在帮助下是否存在 1 级$args->walker->has_children。
<ul>
<li> <!-- lvl 0,I'm here -->
<a></a>
<ul>
<li> <!-- lvl 1 -->
<a></a>
<ul>
<li> <!-- lvl 2,I need to find out if there are elements here -->
<a></a>
</li>
</ul>
</li>
</ul>
</li>
</ul>
我想用 Walker 代码补充我的问题。我正在尝试在 <h4> 上添加一个类。现在条件起作用了：“如果这是级别 0，则内部有级别 1 的子级，然后添加一个类”。
/**
* Starts the element output.
*
* @since 3.0.0
* @since 4.4.0 The {@see 'nav_menu_item_args'} filter was added.
*
* @see Walker::start_el()
*
* @param string $output Used to append additional content (passed by reference).
* @param WP_Post $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
* @param stdClass $args An object of wp_nav_menu() arguments.
* @param int $id Current item ID.
*/
public function start_el( &$output,$item,$depth = 0,$args = null,$id = 0 ) {
if ( isset( $args->item_spacing ) && 'discard' === $args->item_spacing ) {
$t = '';
$n = '';
} else {
$t = "\t";
$n = "\n";
}
$indent = ( $depth ) ? str_repeat( $t,$depth ) : '';
/**
* Filters the arguments for a single nav menu item.
*
* @since 4.4.0
*
* @param stdClass $args An object of wp_nav_menu() arguments.
* @param WP_Post $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
*/
$args = apply_filters( 'nav_menu_item_args',$args,$depth );
$item_classes = '';
if($depth == 0){
if(in_array('menu-item-has-children',$item->classes)){ $item_classes = ' class="page-footer__item"';}
}
$output .= $indent . '<li' . $item_classes . '>';
$atts = array();
$atts['title'] = ! empty( $item->attr_title ) ? $item->attr_title : '';
$atts['target'] = ! empty( $item->target ) ? $item->target : '';
if ( '_blank' === $item->target && empty( $item->xfn ) ) {
$atts['rel'] = 'noopener';
} else {
$atts['rel'] = $item->xfn;
}
$atts['href'] = ! empty( $item->url ) ? $item->url : '';
$atts['aria-current'] = $item->current ? 'page' : '';
/**
* Filters the HTML attributes applied to a menu item's anchor element.
*
* @since 3.6.0
* @since 4.1.0 The `$depth` parameter was added.
*
* @param array $atts {
* The HTML attributes applied to the menu item's `<a>` 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.
* @type string $aria_current The aria-current attribute.
* }
* @param WP_Post $item The current menu item.
* @param stdClass $args An object of wp_nav_menu() arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$atts = apply_filters( 'nav_menu_link_attributes',$atts,$depth );
$attributes = '';
foreach ( $atts as $attr => $value ) {
if ( is_scalar( $value ) && '' !== $value && false !== $value ) {
$value = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
$attributes .= ' ' . $attr . '="' . $value . '"';
}
}
/** This filter is documented in wp-includes/post-template.php */
$title = apply_filters( 'the_title',$item->title,$item->ID );
/**
* Filters a menu item's title.
*
* @since 4.4.0
*
* @param string $title The menu item's title.
* @param WP_Post $item The current menu item.
* @param stdClass $args An object of wp_nav_menu() arguments.
* @param int $depth Depth of menu item. Used for padding.
*/
$title = apply_filters( 'nav_menu_item_title',$title,$depth );
$item_output = $args->before;
if($depth == 0){
if($args->walker->has_children){
$item_output .= '<h4 class="page-footer__list-title">'. $title .'</h4>';
}
}
elseif ($depth == 1 && $args->walker->has_children){
$item_output .= '<h4 class="page-footer__list-title ">'. $title .'</h4>';
}
else{
$item_output .= '<a' . $attributes . ' class="page-footer__link" title="'. $title .'">';
$item_output .= $args->link_before . $title . $args->link_after;
$item_output .= '</a>';
}
$item_output .= $args->after;
/**
* Filters a menu item's starting output.
*
* The menu item's starting output only includes `$args->before`,the opening `<a>`,* the menu item's title,the closing `</a>`,and `$args->after`. Currently,there is
* no filter for modifying the opening and closing `<li>` for a menu item.
*
* @since 3.0.0
*
* @param string $item_output The menu item's starting HTML output.
* @param WP_Post $item Menu item data object.
* @param int $depth Depth of menu item. Used for padding.
* @param stdClass $args An object of wp_nav_menu() arguments.
*/
$output .= apply_filters( 'walker_nav_menu_start_el',$item_output,$depth,$args );
}
解决方法
在这里，您可以使用 walker 类概念背后的基本方法。 由于您的任务是添加唯一的类，如果有任何第二级 层次结构/继承或深度== 2，因此请相应地将此代码用于您的代码段。 这将有助于获得树的深度，如果存在任何级别 2，那么您将能够添加元素和该唯一类..
//This function is responsible for adding "my-parent-item" class to parent menu item's
function add_menu_parent_class( $items ) {
$parents = array();
foreach ( $items as $item ) {
//Check if the item is a parent item
if ( $item->menu_item_parent && $item->menu_item_parent > 0 ) {
$parents[] = $item->menu_item_parent;
}
}
foreach ( $items as $item ) {
if ( in_array( $item->ID,$parents ) ) {
//Add "menu-parent-item" class to parents
$item->classes[] = 'my-parent-item';
}
}
return $items;
}
//add_menu_parent_class to menu
add_filter( 'wp_nav_menu_objects','add_menu_parent_class' );
Or You can also publish it using jQuery if you are by any chance fond of it..
$('ul li.menu-parent-item:has(ul ul)').addClass('your class');
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