Rails：包括外部 JavaScript
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Rails: Include External JavaScript
提问by Daniel Kehoe
I want to use a JavaScript library such as a jQuery plugin. Do I use the Rails asset pipeline? Or should I include it with a javascript_include_tag? What are my options and what is the recommended practice?
我想使用 JavaScript 库，例如 jQuery 插件。我是否使用 Rails 资产管道？或者我应该将它包含在 javascript_include_tag 中？我有哪些选择，推荐的做法是什么？
回答by Daniel Kehoe
Will you use the JavaScript library on only a few pages or throughout the application? If you will use it throughout the application, use the asset pipeline by adding it to the vendor/assets/javascriptsfolder. If you plan to use the library on a single page, use the javascript_include_tag.
您会只在几个页面上还是在整个应用程序中使用 JavaScript 库？如果您将在整个应用程序中使用它，请通过将其添加到vendor/assets/javascripts文件夹来使用资产管道。如果您打算在单个页面上使用该库，请使用javascript_include_tag.
Here are rules of thumb to guide your use of JavaScript in Rails:
以下是指导您在 Rails 中使用 JavaScript 的经验法则：
Logically organize your site-wide scripts in the app/assets/javascripts/folder.
Copy external JavaScript libraries (such as jQuery plugins) to the vendor/assets/javascriptsfolder.
List site-wide scripts in the app/assets/javascripts/application.jsmanifest.
Let the Rails asset pipeline combine them all in one minimized application.jsfile.
For scripts that are used on a few pages that have few visits, load as page-specific JavaScript.
Put page-specific JavaScript in the lib/assets/javascriptsfolder.
在app/assets/javascripts/文件夹中以逻辑方式组织站点范围的脚本。
将外部 JavaScript 库（例如 jQuery 插件）复制到vendor/assets/javascripts文件夹。
在app/assets/javascripts/application.js清单中列出站点范围的脚本。
让 Rails 资产管道将它们全部合并到一个最小化的application.js文件中。
对于在访问量很少的几个页面上使用的脚本，请加载为特定于页面的 JavaScript。
将特定于页面的 JavaScript 放在lib/assets/javascripts文件夹中。
For page-specific JavaScript, use <%= yield(:head) %>in the application layout and <% content_for :head ... %>in the view.
对于特定于页面的 JavaScript，请<%= yield(:head) %>在应用程序布局和<% content_for :head ... %>视图中使用。
For a full explanation with all the details, see my article:
有关所有细节的完整解释，请参阅我的文章：
回答by Shehryar
To access Javascript on a single file, javascript_include_tagis the best option.
要在单个文件上访问 Javascript，javascript_include_tag是最好的选择。
With that what you can do is too add 'Rails.application.config.assets.precompile += %w( yourfilename.js )' to your 'config/initializers/assets.rb' file.
有了这个，您可以做的也就是将 ' Rails.application.config.assets.precompile += %w( yourfilename.js )'添加到您的 ' config/initializers/assets.rb' 文件中。
回答by Apoorv Agarwal
In Haml
在哈姆
= javascript_include_tag "example"
To load the file assets/javascripts/example.js
加载文件 assets/javascripts/example.js
