<div id="submenu">
<?php // "Specific Child Menus" v1.01
/* Author: Adam Meyer | www.apmeyer.com | @apmeyer on twitter
Feel free to use this code in your wordpress templates.
The purpose of this code is to generate a navigational menu
that expands to only display child pages for the page being viewed
*/
// We're assigning this page's post ID to a new variable
// this just makes it a little more obvious later when we
// need to use this value
$thisPageID = $post->ID;
// The function below will be used to recursively build
// child menus for parent pages
// BEGIN FUNCTION getChildMenu()
function getChildMenu($parent) {
// in the loop below we'll be relying on data outside the function
// so we need to pull those global variables in
global $wpdb;
global $thisPageID;
global $ancestors;
// we'll be building a string throughout this function
// the 'return' variable will contain that string
$return = '';
// query the posts table in the wordpress database
// for published pages with the specified parent
$querystr = "
SELECT * FROM $wpdb->posts
WHERE post_status = 'publish'
AND post_type = 'page'
AND post_parent = $parent
ORDER BY menu_order";
// get query results
$pageposts = $wpdb->get_results($querystr, OBJECT);
// if there are results let's make a menu!
if ($pageposts) {
$return = '<ul>';
//loop through the query results to build our nested child menus
foreach ($pageposts as $post):
// wordpress function to prepare the posts...
// basically it enables us to use certain tags/functions
setup_postdata($post);
$return .= '<li><a href="';
$return .= get_permalink($post->ID);
$return .= '">';
$return .= get_the_title($post->ID);
$return .= '</a>';
// use the wp_list_pages function to determine whether or not this page has children
$children = wp_list_pages("title_li=&child_of=".$post->ID."&echo=0");
// if this list item represents the page being viewed
// and the page has children, display them
// OR
// if this list item has a parent and this list item's
// ID is a part of the current page's ancestor array, display the child menu
if(($children && $post->ID == $thisPageID) || ($post->post_parent && in_array($post->ID, $ancestors)) ){
$return .= getChildMenu($post->ID);
}
$return .= '</li>';
endforeach;
// and, we're done generating the string that contains our child menus
$return .= '</ul>';
//
return $return;
}
} // END FUNCTION getChildMenu()
// START Displaying Menu
// we'll be using the getChildMenu() function within this section of code
// to recursively generate child menus (if there are any) for these pages
// YES this page has at least one parent
if ($post->post_parent){
// Create an array containing ancestors of the current page
$ancestors = get_post_ancestors($post->ID);
// How many ancestors are there?
$root = count($ancestors)-1;
// specify the root parent (the eldest grandparent)
$rootParent = $ancestors[$root];
// query the posts table in the wordpress database
// for published pages with the specified parent
$querystr = "
SELECT * FROM $wpdb->posts
WHERE post_status = 'publish'
AND post_type = 'page'
AND post_parent = $rootParent
ORDER BY menu_order";
// get query results
$pageposts = $wpdb->get_results($querystr, OBJECT);
// if there are results, let's make a menu!
if ($pageposts) {
// alter the CSS here if you need to use a different class, or if you need to assign an ID
echo '<ul>';
// loop through the posts and display each child page as a list item
foreach ($pageposts as $post):
setup_postdata($post);
//list top level parents
echo '<li';
// keep level 2 parent "selected" by adding CSS class
if ($post->ID == $thisPageID || in_array($post->ID, $ancestors)){
echo ' class="current_page_item"';
}
echo '><a href="';
echo the_permalink();
echo '">';
echo get_the_title($post->ID);
echo '</a>';
// use the wp_list_pages function to determine whether or not this page has children
$children = wp_list_pages("title_li=&child_of=".$post->ID."&echo=0");
// if this list item represents the page being viewed
// and the page has children, display them
// OR
// if this list item has a parent and this list item's ID is a
// part of the current page's ancestor array, display the child menu
if( ($children && $post->ID == $thisPageID) || ($post->post_parent && in_array($post->ID, $ancestors)) ){
//display children as list
echo getChildMenu($post->ID);
}
echo '</li>';
endforeach;
}
// NO this page does not have a parent
} else {
// if we are at the absolute root level then no child menus should be displayed
// so, it's easiest to just use the wordpress wp_list_pages function to display the menu
echo '<ul>';
wp_list_pages('title_li=&depth=1&sort_column=menu_order&child_of='.$thisPageID);
echo '</ul>';
} // END Displaying Menu
?>
</div>
