gistfile1.txt

# comments.js.coffee
    jQuery ->
      # Create a comment
      $(".comment-form")
        .on "ajax:beforeSend", (evt, xhr, settings) ->
          $(this).find('textarea')
            .addClass('uneditable-input')
            .attr('disabled', 'disabled');
        .on "ajax:success", (evt, data, status, xhr) ->
          $(this).find('textarea')
            .removeClass('uneditable-input')
            .removeAttr('disabled', 'disabled')
            .val('');
          $(xhr.responseText).hide().insertAfter($(this)).show('slow')

          # Delete a comment
      $(document)
        .on "ajax:beforeSend", ".comment", ->
          $(this).fadeTo('fast', 0.5)
        .on "ajax:success", ".comment", ->
          $(this).hide('fast')
        .on "ajax:error", ".comment", ->
          $(this).fadeTo('fast', 1)

#_comment.html.erb
  <div class="comment" id=<%=comment.id %>>
      <div class="well"><%= comment.body %><br>
          <%= comment.user.username %>
      	<small><%= comment.updated_at.strftime('%b %d, %Y at %I:%M %p') %></small>
      	<%= link_to "×", comment_path(comment), :method => :delete, :remote => true, :confirm => "Are you sure you want to remove this comment?", :disable_with => "×", :class => 'close' %></div>
  </div>

#_form.html.erb
<h3>Add Comment</h3>

<div class="comment-form">
<%= simple_form_for @new_comment, :remote => true do |f| %>
  <%= f.error_notification %>

<%= f.input :body, :input_html => {:rows =>"4"}, :label => false %>
<%= f.hidden_field :commentable_id, :value => @new_comment.commentable_id %>
<%= f.hidden_field :commentable_type, :value => @new_comment.commentable_type %>
<%= f.submit "Submit", class: "btn btn-primary", :disable_with => "Submitting..." %>
<% end %>
</div>
<br clear="both">

#show.html.erb
<%= render :partial => 'comments/form', :locals => { :comment => @new_comment } %>
<%= render :partial => 'comments/comment', :collection => @comments, :as => :comment %>