If you keep using AJAX for these, you can
use
JavaScript Window Location[
^]
window.location = "location_" + response
Other method would be
use post or get, this case post is better, request to php server, php server redirect to your targeted location
<form method="post" action="update_location" name='changeLocation'>
<select onchange="document.changeLocation.submit()" name="...">
...
</select>
<form>
in php
<?php
header("Location: location_".$path);