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Nav walker for single page WordPress sites
<?php
class Single_Page_Walker extends Walker_Nav_Menu{
function start_el(&$output, $item, $depth, $args) {
global $wp_query;
$indent = ( $depth ) ? str_repeat( "\t", $depth ) : '';
$class_names = $value = '';
$classes = empty( $item->classes ) ? array() : (array) $item->classes;
$classes[] = 'menu-item-' . $item->ID;
$href = '#';
$url = parse_url($item->url);
$siteurl = parse_url(site_url(), PHP_URL_HOST);
if(strpos($url['host'], $siteurl) !== false){
$path = trim($url['path'], '/');
if(strpos($path, '/') != -1){
$pieces = explode('/', $path);
$href .= end($pieces);
}else{
$href .= $path;
}
if($href == '#'){
$href .= 'home';
}
if(!is_front_page()){
$href = '/'.str_replace('#', '#-', $href);
}
}else{
$href = $item->url;
}
$a_class = trim($href, '/#');
$a_class = empty($a_class) ? 'home' : $a_class;
$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 ) . '"' : '';
// singe page site url filtering
$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( $href ) .'"' : '';
$attributes .= !empty($a_class) ? ' class="'.esc_attr($a_class).'"' : '';
$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;
$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $item, $depth, $args );
}
}
@nrkhatana

Thank you for sharing, it worked for me, however can you please elaborate how to add External link support to this ?

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