没想到我会问这个问题。但是是的，这是真的。Wordpress中似乎没有单独的子菜单？
我绝对不是Wordpress的初学者。多年来一直在it领域工作和发展。
但是，可能需要进行一次大的演练，以获得单独的子菜单/子菜单。但我想在这里得到的答案更像是；
Is it really true there\'s no simple built-in solution?
我真的在这个网站和其他网站上搜索过答案，但很难找到答案。这似乎都是关于下拉列表。我现在太累了！
可以说我也在经营Woocommerce。但没有，他们的文档中也没有答案。关于“二级菜单”的内容很多。但这不一样。我需要亲子关系。
编辑：
Following code example and output example has been added/changed to work as an example of a case scenario:这是我的代码：
<nav class="parent">
<?php
wp_nav_menu(
array(
\'theme_location\' => \'primary\',
\'container_class\' => \'primary-navigation\',
)
);
?>
</nav><!-- #parent -->
// Following menu should only be shown if the selected menu item from the above menu has child items. Show them here below. How do I make these two menus to have a connection to each other?
<nav class="child">
<?php
wp_nav_menu(
array(
\'theme_location\' => \'primary\',
\'container_class\' => \'primary-child-navigation\',
)
);
?>
</nav><!-- #child -->
The output 结果如下：
主页|Bags | 鞋帽
背包|Weekend Bags | 旅行箱|手持式，现在我们进入周末包页面 就这么简单
编辑2：第一个问题是depth 属性似乎不适用于wp_nav_menu(). 不能只有顶级吗？
最合适的回答,由SO网友:Peter Westerlund 整理而成
建立the solution. 把这个放进你的function.php 文件：
// add hook
add_filter( \'wp_nav_menu_objects\', \'my_wp_nav_menu_objects_sub_menu\', 10, 2 );
// filter_hook function to react on sub_menu flag
function my_wp_nav_menu_objects_sub_menu( $sorted_menu_items, $args ) {
if ( isset( $args->sub_menu ) ) {
$root_id = 0;
// find the current menu item
foreach ( $sorted_menu_items as $menu_item ) {
if ( $menu_item->current ) {
// set the root id based on whether the current menu item has a parent or not
$root_id = ( $menu_item->menu_item_parent ) ? $menu_item->menu_item_parent : $menu_item->ID;
break;
}
}
// find the top level parent
if ( ! isset( $args->direct_parent ) ) {
$prev_root_id = $root_id;
while ( $prev_root_id != 0 ) {
foreach ( $sorted_menu_items as $menu_item ) {
if ( $menu_item->ID == $prev_root_id ) {
$prev_root_id = $menu_item->menu_item_parent;
// don\'t set the root_id to 0 if we\'ve reached the top of the menu
if ( $prev_root_id != 0 ) $root_id = $menu_item->menu_item_parent;
break;
}
}
}
}
$menu_item_parents = array();
foreach ( $sorted_menu_items as $key => $item ) {
// init menu_item_parents
if ( $item->ID == $root_id ) $menu_item_parents[] = $item->ID;
if ( in_array( $item->menu_item_parent, $menu_item_parents ) ) {
// part of sub-tree: keep!
$menu_item_parents[] = $item->ID;
} else if ( ! ( isset( $args->show_parent ) && in_array( $item->ID, $menu_item_parents ) ) ) {
// not part of sub-tree: away with it!
unset( $sorted_menu_items[$key] );
}
}
return $sorted_menu_items;
} else {
return $sorted_menu_items;
}
}
然后这样使用：
<?php
wp_nav_menu(
array(
\'theme_location\' => \'primary\',
\'container_class\' => \'primary-navigation\',
\'depth\' => 1
)
);
wp_nav_menu(
array(
\'theme_location\' => \'primary\',
\'container_class\' => \'primary-child-navigation\',
\'sub_menu\' => true
)
);
?>
