Return the HTML response, either redirecting to the URL with a #myAnchor on the end; or with a bit of Javascript embedded in the page, that will scroll/ focus to the desired part.
response.sendRedirect("customerEdit#myAnchor");
Or in JS:
$(document).ready( function(){
var scrollToElement = $("#someElement");
$(window).scrollTop( scrollToElement.offset().top);
});
HTML form POST is, of course, a round-trip to the server. So you can't scroll on the old page, you have to scroll or go (by redirect) to the anchor on the new page.
If you're using AJAX to post, you will of course stay on the existing page & can do whatever you wish. But that's a different kettle of fish.