Rails page specific asset bundles

This is my memo about page specific assets.

Single asset bundle vs multiple asset bundles

• We can create a multiple asset bundles instead of default application.js.
• Pros: Useful if some code is used only on certain occasions.
• Cons: More http requests.

Page Specific Javascript

• In a js file, we can conditionally execute code fragments based on attributes on body tag.

doctype html
html
  /...
  = content_tag :body, class: "#{action_name}_view", id: controller_name, data: { action: action_name, controller: controller_name } do
    /...

doctype html
html
  /...
  - body_class = user_signed_in? ? "body--logged-in" : "body"
  - body_data = { action: action_name.dasherize, controller: controller_path.parameterize.dasherize }
  = content_tag :body, class: body_class, data: body_data do
    /...

Resources

• https://www.driftingruby.com/episodes/page-specific-javascript-in-ruby-on-rails
• https://schneems.com/2017/11/22/self-hosted-config-introducing-the-sprockets-manifestjs/
• 任意の view のみで、特定の js を読み込む方法