Making Bootstrap Modals More Accessible

HTML

<script src="https://netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap-theme.min.css">
<link rel="stylesheet" href="https://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
                                    <button class="btn btn-lg btn-primary" type="button" data-toggle="modal" data-target="#myModal">Launch modal</button>

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
  <div class="modal-dialog">
    <div class="modal-content">
      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
        <h4 class="modal-title" id="myModalLabel">Modal title</h4>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>

JavaScript

$(document).on('click', 'a, button, input[type="button"], input[type="submit"]', function(e) {
 var button = $(event.target);
 
 if(button.parents('.modal').length == 0 && 
    button.parents('.dropdown-menu').length == 0) {
 lastClickedItemToFocusOn = $(this);
 };
});

$(document).on('hidden.bs.modal', function() {
 $(lastClickedItemToFocusOn).focus();
});