没有在Rails应用程序中刷新页面，AJAX就无法加载

我在Rails应用程序中添加了一个AJAX脚本，这样我的表单就会自动将一个car对象添加到car提要中。在幕后，汽车正在像它应该的那样发布到提要上。然而，网页上什么都没有发生，直到我刷新，然后新车弹出。如何在不刷新页面的情况下实现此功能？

AJAX脚本create.js.rb

$('#car_feed').replace("<%= escape_javascript(render 'shared/feed') %>");
$('#new_car').replace("<%= escape_javascript(render 'shared/car_form') %>");
$('#car_errors').html("<%= escape_javascript(render 'shared/error_messages', object: @car) %>");

这是表格：

_car_form.html.erb

<%= form_for(@car, html: {multipart: true, remote: true}) do |f| %>
  <%= render 'shared/error_messages', object: f.object %>
  <h3> Add Your Car</h3>
  <div class="field">
    <%= f.text_area :year, placeholder: "Year i.e. '1993" %>
    <%= f.text_area :brand, placeholder: "Brand i.e. 'Ford'"%>
    <%= f.text_area :model, placeholder: "Model i.e. 'Mustang'" %>
    <%= f.text_area :vin, placeholder: "17 digit VIN number" %>
    <%= f.text_area :mileage, placeholder: "Current Car Mileage" %>
  </div>
  <p> Add a Photo </p>
  <span class="picture">
    <%= f.file_field :picture, accept: 'image/jpeg,image/gif,image/png' %>
  </span>
  <%= f.submit "Add Car", class: "btn btn-add btn-primary" %>
  <% end %>
 <button class="btn btn-hide btn-primary"> Hide Form </button>
<script type="text/javascript">
  $('#car_picture').bind('change', function() {
    size_in_megabytes = this.files[0].size/1024/1024;
    if (size_in_megabytes > 5) {
      alert('Maximum file size is 5MB. Please choose a smaller file.');
    }
  });
</script>

以及应该通过AJAX添加到的提要：

_feed.html.erb

<div id="car_feed">
    <% if @feed_items.any? %>
      <ul class="cars">
        <%= render @feed_items %>
      </ul>
    <% else %>
      <h3> You haven't added any cars yet.</h3>
      <h3> Add one in the sidebar!</h3>
    <% end %>
</div>

轨道日志中的一切看起来都很好：

Started POST "/login" for 128.252.110.217 at 2015-02-27 01:16:38 +0000
Processing by SessionsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"gFDS0iSBZl38m/LMPXulLCxvNgsjMQWMA3P/K+VEVzzTvQfTShKud3UaCRRlz6jL4JFtnwFiA6jukBfxZ7WpIw==", "session"=>{"email"=>"andrew@example.com", "password"=>"[FILTERED]", "remember_me"=>"0"}, "commit"=>"Log in"}
  User Load (1.0ms)  SELECT  "users".* FROM "users" WHERE "users"."email" = ? LIMIT 1  [["email", "andrew@example.com"]]
   (0.2ms)  begin transaction
   (0.1ms)  commit transaction
Redirected to http://rails-tutorial-ajhausdorf.c9.io/
Completed 302 Found in 129ms (ActiveRecord: 1.2ms)