我试图确定一个项目是否有深度为1或更高的子项目。我找不到任何地方,如果我可以编写一些函数/查询来获取当前项在数据库中的外观,如果它有任何子页并返回true
.
我的目标是<li>
如果菜单项有子项,则根据实际情况设置不同的类。
到目前为止我所掌握的代码片段:
if ($depth == 0)
{
if( /*page has subpages*/ )
{
$class_names = $class_names ? \' class="menu-enable"\' : \'\';
}
else
{
$class_names = $class_names ? \'\' : \'\';
}
}
else
{
$class_names = $class_names ? \' class="sub-menu-enable"\' : \'\';
}
现在我需要一些在页面上运行的代码,它有子页面。如何检测父项?
Edit:
完全定制步行者课程:
class header_walker extends Walker_Nav_Menu
{
/**
* @see Walker::start_lvl()
* @since 3.0.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of page. Used for padding.
*/
function start_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat("\\t", $depth);
$output .= "\\n</li>$indent<div class=\\"menu-items\\"><div class=\\"submenu-item\\"><ul>\\n";
}
/**
* @see Walker::end_lvl()
* @since 3.0.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param int $depth Depth of page. Used for padding.
*/
function end_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat("\\t", $depth);
$output .= "$indent</ul></div></div>\\n";
}
/**
* @see Walker::start_el()
* @since 3.0.0
*
* @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 int $current_page Menu item ID.
* @param object $args
*/
function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
$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_names ? \' class="\' . esc_attr( $class_names ) . \'"\' : \'\';
/*
// values of depth
echo $item->title.\' - \';
echo $depth.\'<br />\';
echo $class_names;
if ($depth == 0)
{
if( check for subpage )
{
$class_names = $class_names ? \' class="menu-enable"\' : \'\';
}
else
{
$class_names = $class_names ? \'\' : \'\';
}
}
else
{
$class_names = $class_names ? \' class="sub-menu-enable"\' : \'\';
}*/
$output .= $indent . \'<li\' . $class_names .\'>\';
$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 .\'>\';
$item_output .= $args->link_before . apply_filters( \'the_title\', $item->title, $item->ID ) . $args->link_after;
$item_output .= \'</a>\';
$item_output .= $args->after;
$output .= apply_filters( \'walker_nav_menu_start_el\', $item_output, $item, $depth, $args );
}
/**
* @see Walker::end_el()
* @since 3.0.0
*
* @param string $output Passed by reference. Used to append additional content.
* @param object $item Page data object. Not used.
* @param int $depth Depth of page. Not Used.
*/
function end_el( &$output, $item, $depth = 0, $args = array() ) {
$output .= "</li>\\n";
}
}
最合适的回答,由SO网友:fuxia 整理而成
您可以筛选wp_nav_menu_objects
然后快速添加课程。你甚至不需要定制助行器。
add_filter( \'wp_nav_menu_objects\', \'add_has_children_to_nav_items\' );
function add_has_children_to_nav_items( $items )
{
$parents = wp_list_pluck( $items, \'menu_item_parent\');
foreach ( $items as $item )
in_array( $item->ID, $parents ) && $item->classes[] = \'has-children\';
return $items;
}
班级
has-children
现在将分配给匹配的
li
自动创建元素。
在自定义walker中,您可以在$item->classes
在您的功能中start_el()
. 默认walker中的以下行将完成此操作:
$class_names = join( \' \', apply_filters( \'nav_menu_css_class\', array_filter( $classes ), $item, $args ) );
$class_names = $class_names ? \' class="\' . esc_attr( $class_names ) . \'"\' : \'\';