Sie können dies mit einem benutzerdefinierten Walker tun. Fügen Sie die folgende Klasse am Ende Ihrer functions.php ein:
class Nfr_Menu_Walker extends Walker_Nav_Menu{
/**
* Traverse elements to create list from elements.
*
* Display one element if the element doesn't have any children otherwise,
* display the element and its children. Will only traverse up to the max
* depth and no ignore elements under that depth. It is possible to set the
* max depth to include all depths, see walk() method.
*
* This method shouldn't be called directly, use the walk() method instead.
*
* @since 2.5.0
*
* @param object $element Data object
* @param array $children_elements List of elements to continue traversing.
* @param int $max_depth Max depth to traverse.
* @param int $depth Depth of current element.
* @param array $args
* @param string $output Passed by reference. Used to append additional content.
* @return null Null on failure with no changes to parameters.
*/
function display_element( $element, &$children_elements, $max_depth, $depth=0, $args, &$output ) {
if ( !$element )
return;
$id_field = $this->db_fields['id'];
//display this element
if ( is_array( $args[0] ) )
$args[0]['has_children'] = ! empty( $children_elements[$element->$id_field] );
//Adds the 'parent' class to the current item if it has children
if( ! empty( $children_elements[$element->$id_field] ) ) {
array_push($element->classes,'parent');
$element->title .= ' >';
}
$cb_args = array_merge( array(&$output, $element, $depth), $args);
call_user_func_array(array(&$this, 'start_el'), $cb_args);
$id = $element->$id_field;
// descend only when the depth is right and there are childrens for this element
if ( ($max_depth == 0 || $max_depth > $depth+1 ) && isset( $children_elements[$id]) ) {
foreach( $children_elements[ $id ] as $child ){
if ( !isset($newlevel) ) {
$newlevel = true;
//start the child delimiter
$cb_args = array_merge( array(&$output, $depth), $args);
call_user_func_array(array(&$this, 'start_lvl'), $cb_args);
}
$this->display_element( $child, $children_elements, $max_depth, $depth + 1, $args, $output );
}
unset( $children_elements[ $id ] );
}
if ( isset($newlevel) && $newlevel ){
//end the child delimiter
$cb_args = array_merge( array(&$output, $depth), $args);
call_user_func_array(array(&$this, 'end_lvl'), $cb_args);
}
//end this element
$cb_args = array_merge( array(&$output, $element, $depth), $args);
call_user_func_array(array(&$this, 'end_el'), $cb_args);
}
}
Und dann in header.php (oder wo auch immer Ihr wp_nav_menu ist) machen Sie so etwas:
<?php
$walker = new Nfr_Menu_Walker();
wp_nav_menu( array( 'theme_location' => 'primary', 'walker' => $walker ) );
?>
Der Schlüsselteil des Walkers ist die folgende if-Anweisung:
if( ! empty( $children_elements[$element->$id_field] ) ) {
array_push($element->classes,'parent');
$element->title .= ' >';
}
Dadurch wird überprüft, ob das Element untergeordnete Elemente enthält, und wenn dies der Fall ist, wird die CSS-Klasse 'parent' hinzugefügt, und der Titel wird von 'xxxx' in 'xxxx>' geändert.
(Angepasst von http://wordpress.org/support/topic/wp_nav_menu-add-a-parent-class )