ajax-form.js

jQuery(function($) {
    $('form[data-async]').live('submit', function(event) {
        var $form = $(this);
        var $target = $($form.attr('data-target'));

        $.ajax({
            type: $form.attr('method'),
            url: $form.attr('action'),
            data: $form.serialize(),

            success: function(data, status) {
                $target.html(data);
            }
        });

        event.preventDefault();
    });
});

form.html

<!-- Bootstrap trigger to open modal -->
<a data-toggle="modal" href="#rating-modal">Write a Review</a>

<div class="hide fade modal" id="rating-modal">
  <div class="modal-header">
    <button type="button" class="close" data-dismiss="modal">×</button>
    <h2>Your Review</h2>
  </div>

  <div class="modal-body">
    <!-- The async form to send and replace the modals content with its response -->
    <form class="form-horizontal well" data-async data-target="#rating-modal" action="/some-endpoint" method="POST">
      <fieldset>
        <!-- form content -->
      </fieldset>
    </form>
  </div>

  <div class="modal-footer">
    <a href="#" class="btn" data-dismiss="modal">Cancel</a>
  </div>
</div>