lib/liquid-rails/tags/google_analytics_tag.rb
# Returns a Google Analytics tag.
#
# Usage:
#
# {% google_analytics_tag 'UA-XXXXX-X' %}
module Liquid
module Rails
class GoogleAnalyticsTag < ::Liquid::Tag
Syntax = /(#{::Liquid::QuotedFragment}+)?/
def initialize(tag_name, markup, tokens)
if markup =~ Syntax
@account_id = $1.gsub('\'', '')
else
raise ::Liquid::SyntaxError.new("Syntax Error in 'google_analytics_tag' - Valid syntax: google_analytics_tag <account_id>")
end
super
end
def render(context)
%{
<script type="text/javascript">
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','//www.google-analytics.com/analytics.js','ga');
ga('create', '#{@account_id}', 'auto');
ga('send', 'pageview');
</script>
}
end
end
end
end
Liquid::Template.register_tag('google_analytics_tag', Liquid::Rails::GoogleAnalyticsTag)