Awesome

angularjs-rails-cdn

Adds CDN support to

• angularjs-rails.

Serving javascripts and stylesheets from a publicly available CDN has clear benefits:

• Speed: Users will be able to download AngularJS from the closest physical location.
• Caching: CDN is used so widely that potentially your users may not need to download AngularJS and others at all.
• Parallelism: Browsers have a limitation on how many connections can be made to a single host. Using CDN for AngularJS offloads a big one.

Features

This gem offers the following features:

• Can support multiple CDNs, but currently only Google provider is available.
• AngularJS version is automatically detected via angularjs-rails (can be overriden).
• Automatically fallback to angularjs-rails bundled AngularJS when:
  • You're on a development environment so that you can work offline.
  • The CDN is down or unavailable.

Implications of externalizing AngularJS from application.js are:

• Updating your JS code won't evict the entire cache in browsers - your code changes more often than AngularJS upgrades, right?
• rake assets:precompile takes less peak memory usage.

Changelog:

• v0.1.4: Clean up and missing specs
• v0.1.3: Be a bit more html_safe
• v0.1.2: Specified license in spec file
• v0.1.1: Pass options to javascript_include_tag
• v0.1.0: Initial release

Installation

Add this line to your application's Gemfile:

gem 'angularjs-rails-cdn'

Usage

This gem adds methods to generate a script tag to the AngularJS on a CDN of your preference: angularjs_include_tag and angularjs_url

If you're using assets pipeline with Rails 3.1+, first remove //= require angular (or other special files if you are using not full version) from application.js.

Then in layout:

= angularjs_include_tag :google
= javascript_include_tag 'application'

Other possible usages:

# To override version
= angularjs_include_tag :google, version: '1.1.5'
# To load additional AngularJS modules
= angularjs_include_tag :google, modules: [:resources,
:cookies]

Note: currently only valid CDN symbols is:

:google

It will generate the following for AngularJS on production:

<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js" type="text/javascript"></script>
<script type="text/javascript">
//<![CDATA[
window.angular || document.write(unescape('%3Cscript src="/assets/angular-3aaa3fa0b0207a1abcd30555987cd4cc.js" type="text/javascript">%3C/script>'))
//]]>
</script>

on development:

<script src="/assets/angular.js?body=1" type="text/javascript"></script>

If you want to check the production URL, you can pass force: true as an option.

angularjs_include_tag :google, force: true

To fallback to rails assets when CDN is not available, add angular.js in config/environments/production.rb

config.assets.precompile += %w( angular.js )