保存并重新加载后，Rails Server仅成功运行一次表单

Question

I have 2 pieces of code that will only run once when I make a change and save the code in the form and then reload the form. The next time I open and run the form it fails to run. Every other part of my application runs just fine.

The first is a datepicker:

The datepicker only shows up the first time.

Here is the coffee script:

$.fn.extend {
  integrateDatepicker: (selector)->
    selector = selector || '.datepicker'
    $(@).find(selector).datepicker({"format": "dd/mm/yyyy"}) 
}
$(document).ready () ->
  $('body').integrateDatepicker()

Here is the form snippet:

<div class="row">
  <div class="span6 offset3">
    <%= simple_form_for([@council_report]) do |f| %>
      <p>
        <%= f.input :report_title %>
      </p>
      <p>
        <%= f.input :report_desc %>
      </p>
      <p>
        <%= f.input :report_date, as: :string, input_html: {class: 'datepicker'} %>
      </p>       
      <p>
        <%= f.submit  class: "btn btn-large btn-primary" %>
      </p>
    <% end %>
  </div>
</div>

The second is a form post:

The "create" action runs successfully only the first time the form loads.

Here is the form snippet:

<%= form_for(:select_asset, url: {action: "create"}) do |form| %>
  <% @assets_not_in.each_with_index do |asset_not_in, index|
       asset = Asset.find(asset_not_in.id) %>
       <%= fields_for "assets_to_check[#{index}]", asset_not_in do |f| %>
         <%= f.hidden_field :id, :value => asset.id %>
         <tr>
           <td><%= asset.asset_name %></td>
           <td><%= asset_type_desc(asset.asset_type_code) %></td>
           <td><%= asset.address.address_long %></td>
           <td><%= asset.address.postcode %></td>
           <td><%= asset.address.state_code %></td>
           <td><%= f.check_box :add_asset %></td>
         </tr>
       <% end %>
  <% end %>
</table>

  <%= link_to 'Back', council_report_report_assets_path(@council_report) %>
  <%= form.submit "Add Assets", class: "btn btn-large btn-primary" %>
<% end %>

Questions:

1. Has anyone out there experienced this behaviour?
2. What is wrong with my application causing this bizaire behaviour?
3. Of course, how do I fix it?

Answer 1

Turbolinks is enabled by default in rails 4 and will cause issues with jQuery's $(document).ready .

To verify you're runnign turbolinks, check your app/views/layouts/application.html.erb . Look for the lines

<%= stylesheet_link_tag "application", media: "all", "data-turbolinks-track" => true %>
<%= javascript_include_tag "application", "data-turbolinks-track" => true %>

in the head . If they are set to true, try adding the jquery-turbolinks gem to your Gemfile.

Turbolinks renders some parts of the page via ajax, so $(document).ready will not fire unless you enter the site through that page OR do a hard refresh. The gem fixes this by automatically changing your $(document).ready listeners: http://edgeguides.rubyonrails.org/working_with_javascript_in_rails.html#turbolinks