<base href="[[++base_url]]" />

-1: (default value) URL is relative to site_url
0: see http
1: see https
full: URL is absolute, prepended with site_url from config
abs: URL is absolute, prepended with base_url from config
http: URL is absolute, forced to http scheme
https: URL is absolute, forced to https scheme

&scheme=`abs`

<a href="[[~id]]#test">Ссылка</a>

<a href="#test">Ссылка</a>

$modx->sendRedirect($modx->makeUrl($modx->resource->id),array('responseCode' => 'HTTP/1.1 301 Moved Permanently'));

<div class="dropdown visible-minitablet pull-right">
	<a href="#" id="drop" role="button" class="dropdown-toggle" data-toggle="dropdown">[[+pagetitle]]<img src="img/menu_icon_mobile.gif" alt="" class="show"/><img src="img/menu_icon_mobile2.gif" alt="" class="hide"/></a>
	<ul class="dropdown-menu" role="menu" aria-labelledby="drop">
		[[+wrapper]]
	 </ul>
</div>

<?php
if ($modx->event->name == 'OnLoadWebDocument') {
	$uri = $_SERVER['REQUEST_URI'];
	if ($modx->resource->isfolder && substr($uri, -1) != '/') {
		$modx->sendRedirect($modx->makeUrl($modx->resource->id));
	}
}

$url = 'http://'.$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI'];//Узнаем текущий URL
$last = strlen($url) - 1;//Узнаем позицию последнего символа URL'a
$slash = $url{$last};//Узнаем последний символ URL'a
$id = $modx->getObject('modResource',$modx->resource->get('id'));//Узнаем ID ресурса
$cat = $id->get('isofolder');//Узнаем тип ресурса (каталог или документ)
if ($cat == '1' && $slash != '/'){//Если это каталог и в конце URL'a нет слэша,
    header("HTTP/1.1 301 Moved Permanently");//то вставляем эти заголовки.
    header("Location: $url/");
    exit();
}