Simplest, easier and nice method to submit MVC form using jQuery AJAX:

$("formMapMarker").submit(function(e) {
	if ($("formMapMarker").valid()) {
		$.post($(this).attr("action"), $(this).serialize());
	}
	e.preventDefault();
});

Controller:

[HttpPost, ValidateInput(false)]
public ActionResult Create([Bind(Exclude="Id")] MapMarker marker)
{
	if (ModelState.IsValid)
	{
		try
		{
			db.AddToMapMarkers(marker);
			db.SaveChanges();
			return RedirectToAction("Index");
		}
		catch
		{
			return View();
		}
	} else
		return View();
}

$("formMapMarker").submit – assign function on form submit behaviour. $("formMapMarker").valid() – check if form passed validation (jQuery validation plugin used, see previous article). $.post($(this).attr("action"), $(this).serialize()) – get action path, collect form data and serialise it and make AJAX POST call to server. e.preventDefault() – cancel default behaviour with submit form button.
Just few lines of code and it works like a charm. :) BTW form submits will work with disabled JavaScript.