How to Include Page-Specific JavaScript in Rails 3.1 Without Manual Script Tags?

In Rails 3.1, Where Do You Place Your "Page Specific" JavaScript Code?

Question:

In Rails 3.1, when all JavaScript is merged into a single file due to //= require_tree ., how can you include page-specific JavaScript code without it executing on all pages? Is it possible to prevent code clashes and avoid the use of manual script tags?

Answer:

Controller-Specific JavaScript:

Rails provides a solution for this through controller-specific asset files. For example, a ProjectsController will have corresponding asset files at:

• app/assets/javascripts/projects.js.coffee
• app/assets/stylesheets/projects.css.scss

Any unique JavaScript or CSS code for that controller can be placed in these files. Then, include them only when needed with:

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

Wrapping Features in Divs:

An alternative approach is to wrap features in div tags with unique IDs or classes. The JavaScript code can check for the presence of these elements and execute accordingly, ensuring it only runs on the intended pages. This allows for modular JavaScript code that can be selectively included based on the page's content.

Avoiding Code Clashes:

By using namespace prefixes or module patterns, code clashes can be avoided. For instance, code for a specific page could be wrapped in:

(function() {
  var PageSpecificCode = {};
  // ...
})();

Eliminating Manual Script Tags:

With the above approaches, the need for manual script tags on individual pages is eliminated. JavaScript code can be centralized and managed through the application.js manifest file and controller-specific asset files, providing cleaner and more efficient code organization.

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