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Railsで任意のjavascriptだけを読み込む

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1. 共通で読み込みたいjavascrptをマニフェストに記述

app/assets/javascripts/application.js
-  //= require_tree .  
+  //= require bootstrap
+  //= require calendar
+  //= require events

2. app/assets/javascripts/ 配下に置かれているJSファイル群はAssets Pipeline の対象外になってしまうので以下の行を追加

config/environments/production.rb
+  config.assets.precompile += ['*.js']

3. 特定のページのみでjavascript読み込む

assets/javascript/chat.js.coffeeを読み込む場合

html.erb
<%= javascript_include_tag 'assets/chat' %>
config/initializers/assets.rb
Rails.application.config.assets.precompile += %w( chat.js )
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