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Editorial Team
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Asked: 2026-05-22T00:37:09+00:00

In Rails, the common idiom for page-specific Javascript is: (layout) <head> <% yield :javascript

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In Rails, the common idiom for page-specific Javascript is:

(layout)

<head>
  <% yield :javascript %>
</head>

(view)

<% content_for :javascript do %>
  <script type="text/javascript">
    $().whatever;
  </script>
<% end %>

I hate repeating the script tags. Is there any reason why the following is a bad idea?

(layout)

<head>
  <script type="text/javascript">
    <% yield :javascript %>
  </script>
</head>

(view)

<% content_for :javascript do %>
    $().whatever;
<% end %>
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1 Answer

  1. Editorial Team

    I agree that it’s what is most specific to your use case. Generally, when I use the <% yield :javascript %>, it’s purpose is to add in page specific libraries, which would be a limitation to the approach you proposed. If you want to support both, I have done the following:

    (layout)

    <head>
  <% yield :javascript_libraries %>
  <script type="text/javascript">
    <% yield :javascript %>
  </script>
</head>

    (view)

    <% content_for :javascript do %>
    $().whatever;
<% end %>
<% content_for :javascript_library do %>
    <%= javascript_include_tag 'page-specific.js' %>
<% end %>

    Of course most people put javascript libraries at the bottom for optimization of page loading, so then you could just move it in your layout.

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