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bs533-navwalker.php
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bs533-navwalker.php
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<?php
// Custom nav walker class to integrate WordPress nav menus with Bootstrap 5.3.3
class bootstrap_533_wp_nav_menu_walker extends Walker_Nav_Menu
{
private $current_item;
private $dropdown_menu_alignment_values = [
'dropdown-menu-start',
'dropdown-menu-end',
'dropdown-menu-sm-start',
'dropdown-menu-sm-end',
'dropdown-menu-md-start',
'dropdown-menu-md-end',
'dropdown-menu-lg-start',
'dropdown-menu-lg-end',
'dropdown-menu-xl-start',
'dropdown-menu-xl-end',
'dropdown-menu-xxl-start',
'dropdown-menu-xxl-end'
];
// Starts the list before the elements are added.
public function start_lvl(&$output, $depth = 0, $args = null)
{
$dropdown_menu_class = [];
foreach($this->current_item->classes as $class) {
if(in_array($class, $this->dropdown_menu_alignment_values)) {
$dropdown_menu_class[] = $class;
}
}
$indent = str_repeat("\t", $depth);
$submenu = ($depth > 0) ? ' sub-menu' : '';
// Use the .dropdown-menu class and apply alignment classes if any.
$output .= "\n$indent<ul class=\"dropdown-menu$submenu " . esc_attr(implode(" ", $dropdown_menu_class)) . " depth_$depth\">\n";
}
// Starts the element output.
public function start_el(&$output, $item, $depth = 0, $args = null, $id = 0)
{
$this->current_item = $item;
$indent = ($depth) ? str_repeat("\t", $depth) : '';
$li_attributes = '';
$class_names = $value = '';
$classes = empty($item->classes) ? array() : (array) $item->classes;
// Apply Bootstrap's .dropdown and .nav-item classes as needed.
$classes[] = ($args->walker->has_children) ? 'dropdown' : '';
$classes[] = 'nav-item';
$classes[] = 'nav-item-' . $item->ID;
if ($depth && $args->walker->has_children) {
$classes[] = 'dropdown-submenu';
}
$class_names = join(' ', apply_filters('nav_menu_css_class', array_filter($classes), $item, $args));
$class_names = ' class="' . esc_attr($class_names) . '"';
$id = apply_filters('nav_menu_item_id', 'menu-item-' . $item->ID, $item, $args);
$id = strlen($id) ? ' id="' . esc_attr($id) . '"' : '';
$output .= $indent . '<li' . $id . $value . $class_names . $li_attributes . '>';
// Set up the attributes for the menu item's <a> element.
$attributes = !empty($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) . '"' : '';
// Active class on current menu item.
$active_class = ($item->current || $item->current_item_ancestor) ? 'active' : '';
$nav_link_class = ($depth > 0) ? 'dropdown-item ' : 'nav-link ';
// Bootstrap 5 dropdown toggle data attribute.
$attributes .= ($args->walker->has_children) ? ' class="' . $nav_link_class . $active_class . ' dropdown-toggle" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false"' : ' class="' . $nav_link_class . $active_class . '"';
// Build the HTML output for the menu item.
$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;
// Apply filters and append to the output.
$output .= apply_filters('walker_nav_menu_start_el', $item_output, $item, $depth, $args);
}
}