How Can I Ensure Page-Specific JavaScript Execution in Rails 3.1\'s Asset Pipeline?

Where to Place Page-Specific JavaScript in Rails 3.1

In Rails 3.1, the Asset Pipeline combines all JavaScript files into a single file, improving performance. However, this raises concerns about the execution of page-specific code on all pages.

Controller-Specific JavaScript

The Asset Pipeline documentation provides a solution for including controller-specific JavaScript. By creating separate JavaScript and CSS files in the following locations:

• app/assets/javascripts/[controller_name].js.coffee
• app/assets/stylesheets/[controller_name].css.scss

You can then load these files only for specific controllers using the following tags:

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

Other Options

If the above approach is not suitable, you can consider these options:

• ID/Class Check: Enclose page-specific elements in DIVs with unique IDs or classes. In the JavaScript code, check if these identifiers are present and execute the code accordingly. This ensures that code runs only on pages where it's needed.
• AJAX: Use AJAX to load page-specific JavaScript dynamically.

Conclusion

Page-specific JavaScript can be handled in Rails 3.1 using controller-specific JavaScript files, or the ID/Class check and AJAX methods mentioned above. By choosing the appropriate approach, you can optimize your JavaScript execution and prevent unnecessary code bloat.

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