Where should page-specific JavaScript code be placed in Rails 3.1?

Managing Page-Specific JavaScript in Rails 3.1

Question:

In Rails 3.1, where should page-specific JavaScript code be placed, considering the default merging of all JavaScript into a single file?

Answer:

Although Rails 3.1 combines all JavaScript into one file by default, the Asset Pipeline documentation provides a solution for controller-specific JavaScript:

• Each controller will have its own corresponding JavaScript and CSS files, located at app/assets/javascripts/[controller_name].js.coffee and app/assets/stylesheets/[controller_name].css.scss respectively.
• Controller-unique code should be placed within these asset files.

• To load these files only for specific controllers, use:

  • <%= javascript_include_tag params[:controller] %>
  • <%= stylesheet_link_tag params[:controller] %>

This approach allows you to ensure that page-specific JavaScript code is executed only on the relevant pages.

Additional Benefits:

• Eliminates conflicts from duplicate code
• Prevents unnecessary instantiation of objects for pages that don't require them
• Simplifies maintenance and eliminates the need for manual script tags

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