这是我在这个网站上的第一个问题。在这里搜索了很多次，几乎找到了我需要的所有答案。
我正在使用 underscores.me ==> test.davidsfonds-zele.be 在 wordpress 网站上工作
在左侧，您可以找到一个可以打开以单击子项的垂直菜单。
当您单击并转到所属页面时，子项会突出显示，但您看不到它，因为菜单不再打开。
有没有办法让它打开？
该菜单是在 Wordpress 的管理面板中构建的，因为其他管理员（没有任何网络知识）也可以更改菜单。
我尝试了很多事情，但都没有成功。如果您有其他完整的方法可以做到这一点，请随时向我学习。我认为我使用的这段代码太长了......我使用以下方法来获得我现在拥有的东西：
网站教程：http ://cssmenumaker.com/blog/wordpress-accordion-menu-tutorial
功能
class CSS_Menu_Maker_Walker extends Walker {
var $db_fields = array( 'parent' => 'menu_item_parent', 'id' => 'db_id' );
function start_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat("\t", $depth);
$output .= "\n$indent<ul>\n";
}
function end_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat("\t", $depth);
$output .= "$indent</ul>\n";
}
function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
global $wp_query;
$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
$class_names = $value = '';
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
/* Add active class */
if(in_array('current-menu-item', $classes)) {
$classes[] = 'active';
unset($classes['current-menu-item']);
}
/* Check for children */
$children = get_posts(array('post_type' => 'nav_menu_item', 'nopaging' => true, 'numberposts' => 1, 'meta_key' => '_menu_item_menu_item_parent', 'meta_value' => $item->ID));
if (!empty($children)) {
$classes[] = 'has-sub';
}
$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
$class_names = $class_names ? ' class="' . esc_attr( $class_names ) . '"' : '';
$id = apply_filters( 'nav_menu_item_id', 'menu-item-'. $item->ID, $item, $args );
$id = $id ? ' id="' . esc_attr( $id ) . '"' : '';
$output .= $indent . '<li' . $id . $value . $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 .'><span>';
$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
$item_output .= '</span></a>';
$item_output .= $args->after;
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
function end_el( &$output, $item, $depth = 0, $args = array() ) {
$output .= "</li>\n";
}
}菜单.php
<?php
wp_nav_menu(array(
'menu' => 'Linkermenu', // This will be different for you.
'container_id' => 'cssmenu',
'walker' => new CSS_Menu_Maker_Walker()
));
?>Javascript：
( function( $ ) {
$( document ).ready(function() {
$('#cssmenu li.has-sub>a').on('click', function(){
$(this).removeAttr('href');
var element = $(this).parent('li');
if (element.hasClass('open')) {
element.removeClass('open');
element.find('li').removeClass('open');
element.find('ul').slideUp();
}
else {
element.addClass('open');
element.children('ul').slideDown();
element.siblings('li').children('ul').slideUp();
element.siblings('li').removeClass('open');
element.siblings('li').find('li').removeClass('open');
element.siblings('li').find('ul').slideUp();
}
});
$('#cssmenu>ul>li.has-sub>a').append('<span class="holder"></span>');
(function getColor() {
var r, g, b;
var textColor = $('#cssmenu').css('color');
textColor = textColor.slice(4);
r = textColor.slice(0, textColor.indexOf(','));
textColor = textColor.slice(textColor.indexOf(' ') + 1);
g = textColor.slice(0, textColor.indexOf(','));
textColor = textColor.slice(textColor.indexOf(' ') + 1);
b = textColor.slice(0, textColor.indexOf(')'));
var l = rgbToHsl(r, g, b);
if (l > 0.7) {
$('#cssmenu>ul>li>a').css('text-shadow', '0 1px 1px rgba(0, 0, 0, .35)');
$('#cssmenu>ul>li>a>span').css('border-color', 'rgba(0, 0, 0, .35)');
}
else
{
$('#cssmenu>ul>li>a').css('text-shadow', '0 1px 0 rgba(255, 255, 255, .35)');
$('#cssmenu>ul>li>a>span').css('border-color', 'rgba(255, 255, 255, .35)');
}
})();
function rgbToHsl(r, g, b) {
r /= 255, g /= 255, b /= 255;
var max = Math.max(r, g, b), min = Math.min(r, g, b);
var h, s, l = (max + min) / 2;
if(max == min){
h = s = 0;
}
else {
var d = max - min;
s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
switch(max){
case r: h = (g - b) / d + (g < b ? 6 : 0); break;
case g: h = (b - r) / d + 2; break;
case b: h = (r - g) / d + 4; break;
}
h /= 6;
}
return l;
}
});
} )( jQuery );.css 文件：
#cssmenu,
#cssmenu ul,
#cssmenu ul li{
position: relative;
margin: 0;
width: 100%;
list-style: none;
line-height: 1;
display: block;
}
#cssmenu {
width: 100%;
float: left;
font-size: 1em;
font-family: 'Lato', sans-serif;
text-transform: uppercase;
}
#cssmenu ul li {
font-weight: bold;
background: #fff;
padding: 5%;
}
#cssmenu ul li a {
position: relative;
color: #4d4d4d;
left: -10%;
margin: 0;
width: 100%;
list-style: none;
line-height: 1;
display: block;
cursor: pointer;
z-index: 2;
padding: 15px 7px;
border-bottom: 1px solid #ddd;
border-left: 1px solid #ddd;
}
#cssmenu > ul > li > a:hover{
background: #407194;
color: #fff;
text-decoration: none;
}
#cssmenu > ul > li.open > a{
background: #407194;
color: #fff;
text-decoration: none;
display: block;
position: relative;
}
#cssmenu > ul > li.active > a {
display: block;
position: relative;
}
#cssmenu ul ul li a {
position: relative;
left: -30%;
margin: 0;
width: 150%;
list-style: none;
line-height: 1;
display: block;
cursor: pointer;
color: #ed6d16;
z-index: 2;
padding: 10%;
border-bottom: 1px solid #ddd;
border-left: 1px solid #ddd;
}
#cssmenu ul ul li:hover > a{
background: #f68615;
color: #fff;
text-decoration: none;
}
#cssmenu ul ul li.open > a{
background: #407194;
color: #fff;
text-decoration: none;
display: block;
position: relative;
}
#cssmenu ul ul li.active > a {
display: block;
position: relative;
}
#cssmenu ul ul li.has-sub > a::after {
display: block;
position: absolute;
content: "";
width: 500px;
height: 5px;
right: 20px;
z-index: 10;
top: 11.5px;
border-top: 2px solid #eeeeee;
border-left: 2px solid #eeeeee;
-webkit-transform: rotate(-135deg);
-moz-transform: rotate(-135deg);
-ms-transform: rotate(-135deg);
-o-transform: rotate(-135deg);
transform: rotate(-135deg);
}
#cssmenu ul ul li.active > a::after,
#cssmenu ul ul li.open > a::after,
#cssmenu ul ul li > a:hover::after {
border-color: #ffffff;
}
#cssmenu ul li li.current-menu-item.current_page_item a {
background: #407194;
color: #fff;
text-decoration: none;
display: block;
}
#cssmenu ul ul {
display: none;
}
.holder {
width: 0;
height: 0;
position: absolute;
top: 0;
right: 0;
}
.holder::after,
.holder::before {
display: block;
position: absolute;
content: "";
width: 6px;
height: 6px;
right: 20px;
z-index: 10;
-webkit-transform: rotate(-135deg);
-moz-transform: rotate(-135deg);
-ms-transform: rotate(-135deg);
-o-transform: rotate(-135deg);
transform: rotate(-135deg);
}
.holder::after {
top: 17px;
border-top: 2px solid #ffffff;
border-left: 2px solid #ffffff;
}
#cssmenu > ul > li > a:hover > span::after,
#cssmenu > ul > li.active > a > span::after,
#cssmenu > ul > li.open > a > span::after {
border-color: #eeeeee;
}
.holder::before {
top: 18px;
border-top: 2px solid;
border-left: 2px solid;
border-top-color: inherit;
border-left-color: inherit;
}