Keep Sub-Menu Open when Viewing Child Pages in WordPress?

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I have a small jQuery menu setup on my site. When you click on a parent link it provides a smooth scrolling effect to display the sub pages.

I’m trying to find out how to keep the menu open whenever you’re viewing a subpage? Right now if you click Parent -> Subpage the new page will load with the whole menu closed. I want to keep the parent submenu open for all its child pages(I’m using WordPress if that matters). Would appreciate any help! Happy to clarify myself if need be.

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  1. I’ve had this problem a while ago, but I didn’t use jquery. I think you can use this on you’re site. The idea is simple: show a div if you’re on a subpage.

    <?php
global $wp_query;

if( empty($wp_query->post->post_parent) ) {
$parent = $wp_query->post->ID;
} else {
$parent = $wp_query->post->post_parent;
} ?>
<?php if(wp_list_pages("title_li=&child_of=$parent&echo=0" )): ?>
<div id="show">
<ul id="menu" class="black">
<li><a href="http://www.myhomepage.com">Home</a></li>
<?php wp_list_pages("title_li=&child_of=$parent" ); ?>
</ul>
</div>


<?php endif; ?>

    Basically this script checks if you are on a page or on a sub-page. If you are on a sub-page it will show the div with id=”show”(the list of all subpages who have the same parent as the supage you’re currently on).