AMP in Rails apps
Utilities to simplify Accelerated Mobile Pages (AMP) implementation in Rails apps.
Features
Implemented:
- Tag to include AMP boilerplate CSS.
- Tag to include AMP base JS.
- Tag to include custom CSS.
- Google Analytics integration.
Todo:
- AMP validation via Ruby tests.
- ...
Platforms
Minimum supported MRI version is 2.2.6
. JRuby is not supported.
The gem should work on Mac, Linux and Windows, however testing
is limited as follows:
- Mac OS X (development machine)
- Windows (via appveyor)
- Ubuntu (via travis-ci)
Installation
Add this line to your application's Gemfile:
gem 'roll-amp'
And then execute:
$ bundle
Or install it yourself as:
$ gem install roll-amp
Usage
Include main JS
<%= amp_js %>
Includes https://cdn.ampproject.org/v0.js
script at a place where the amp_js
tag was specified.
This tag is required for AMP.
Include boilerplate CSS
<%= amp_boilerplate %>
Includes basic CSS suggested at https://www.ampproject.org/docs/get_started/create/basic_markup
Include custom CSS
- Create CSS (SASS, SCSS) file under
app/stylesheets
of your Rails app.
For example app/stylesheets/amp/application.scss
. - Add the following line to your AMP layout:
<%= amp_custom_style('amp/application') %>
When amp/application
is available in the assets pipeline,
its content will be loaded from there. Otherwise such file will be searched in
the public
directory.
Usually it’s sufficient to create CSS file and Rails will handle the rest.
Please note, AMP sets 50K limit on CSS size. If you include larger stylesheet
your pages won’t be valid.
Google Analytics
- Insert the following tag before
amp_js
:
<%= amp_analytics_js %>
- Add analytics configuration to the body:
<%=
amp_google_analytics(
'UA-00000-1',
{
trackPageview: {
on: 'visible',
request: 'pageview'
}
}
)
%>
First parameter is Google Analytics account ID.
Second parameter defines triggers. Please see Adding Analytics to your AMP pages
to learn about triggers. The example above shows the most common configuration.
Layout example
<!doctype html>
<html ⚡>
<head>
<%= amp_analytics_js %>
<%= amp_js %>
<%= csrf_meta_tags %>
<%= amp_boilerplate %>
<%= amp_custom_style('amp/application') %>
</head>
<body>
<%=
amp_google_analytics(
'UA-00000-1',
{
trackPageview: {
on: 'visible',
request: 'pageview'
}
}
)
%>
<%= yield %>
</body>
</html>
Development
After checking out the repo, run bin/setup
to install dependencies.
Then, run rake spec
to run the tests. You can also run bin/console
for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run bundle exec rake install
.
To release a new version, update the version number in version.rb
,
and then run bundle exec rake release
, which will create a git tag for
the version, push git commits and tags, and push the .gem
file to rubygems.org.
Contributing
Bug reports and pull requests are welcome on GitHub
at https://github.com/roll-rails/roll-amp. This project is intended to be
a safe, welcoming space for collaboration, and contributors are expected
to adhere to the Contributor Covenant
code of conduct.
License
The gem is available as open source under the terms of the
MIT License.