def create
  @my_thing = MyThing.create(params[:my_thing])
  respond_to do |format|
    format.json { @my_thing.to_json }
  end
end

$(document).ready(function() {
  var $list = $('#list'),
      $form = $('#my_form');
  $form.bind('submit', function(event) {
    event.preventDefault();
    $.ajax({
      url: $form.attr('action')+'.json',
      type: 'POST',
      dataType: 'json',
      data: $form.serialize(),
      success: function(json) {
        var obj = json['my_model_name'];
        $list.append('<li>'+obj['name']+'</li>');
        $form.find(':input').each(function() {
          switch(this.type) {
              case 'password':
              case 'select-multiple':
              case 'select-one':
              case 'text':
              case 'textarea':
                  $(this).val('');
                  break;
              case 'checkbox':
              case 'radio':
                  this.checked = false;
          }
        });
      }
    });
  });
});