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wp-bootstrap4-navwalker.php
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wp-bootstrap4-navwalker.php
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<?php
/**
* Extended Walker class for use with Bootstrap 4.0.0b Dropdown menus and Submenus in Wordpress.
* Edited to support n-levels submenu and Boostrap 4b menu styles
* @author @jaycbrf4 https://github.com/jaycbrf4
* Original work by johnmegahan https://gist.github.com/1597994, Emanuele 'Tex' Tessore https://gist.github.com/3765640
* @license CC BY 4.0 https://creativecommons.org/licenses/by/4.0/
*/
class BootstrapNavMenuWalker extends Walker_Nav_Menu {
function start_lvl( &$output, $depth = 0, $args = array() ) {
$indent = str_repeat( "\t", $depth );
$submenu = ($depth > 0) ? ' sub-menu' : '';
$output .= "\n$indent<ul class=\"dropdown-menu$submenu depth_$depth\">\n";
}
function start_el( &$output, $item, $depth = 0, $args = array(), $id = 0 ) {
$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
$li_attributes = '';
$class_names = $value = '';
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
// managing divider: add divider class to an element to get a divider before it.
$divider_class_position = array_search('divider', $classes);
if($divider_class_position !== false){
$output .= "<div class=\"divider\"></div>\n";
unset($classes[$divider_class_position]);
}
$classes[] = ($args->has_children) ? 'dropdown' : '';
$classes[] = ($item->current || $item->current_item_ancestor) ? 'active' : '';
$classes[] = 'nav-item-' . $item->ID;
if($depth && $args->has_children){
$classes[] = 'dropdown-submenu';
}
$class_names = join( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $item, $args ) );
$class_names = ' class="nav-item ' . esc_attr( $class_names ) . '"';
$id = apply_filters( 'nav_menu_item_id', 'nav-item-'. $item->ID, $item, $args );
$id = strlen( $id ) ? ' id="' . esc_attr( $id ) . '"' : '';
$output .= $indent . '<li' . $id . $value . $class_names . $li_attributes . '>';
$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 ) .'"' : '';
$attributes .= ($args->has_children) ? ' class="dropdown-toggle" data-toggle="dropdown"' : '';
$item_output = $args->before;
$item_output .= '<a'. $attributes .'>';
$item_output .= $args->link_before . apply_filters( 'the_title', $item->title, $item->ID ) . $args->link_after;
$item_output .= (($depth == 0 || 1) && $args->has_children) ? ' <b class="caret"></b></a>' : '</a>';
$item_output .= $args->after;
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
function display_element( $element, &$children_elements, $max_depth, $depth=0, $args, &$output ) {
//v($element);
if ( !$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] );
else if ( is_object( $args[0] ) )
$args[0]->has_children = ! empty( $children_elements[$element->$id_field] );
$cb_args = array_merge( array(&$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);
}
}