Use Google Analytics' Event Tracking everywhere in your Rails app!

This gem alllows you to annotate events everywhere in the code of your Rails app. A rack middleware is automatically inserted into the stack. It transports the event data to the client. Normal requests get a DIV injected, Ajax requests get a data-pounded custom HTTP header appended. In case of redirects the data survives inside of rack a rack session. The asset pipeline-ready CoffeeScript extracts this data on the client-side and pushes it to Google Analytics via gtag.js or Google Tag Manager.


  • Ruby >= 3.2
  • Rails 4.2 onwards
  • jQuery


Add it to your Gemfile with:

gem 'ga_events'

Run the bundle command to install it.

Add to the top of your application.js (but after requiring jQuery):

//= require ga_events.js

After requiring ga_events.js, you have to choose an adapter.

Google Analytics 4 (gtag.js)

GaEvents.Event.adapter = function() {
  return new GaEvents.GTagAdapter();

Optionally you can specify a custom tracker GA_MEASUREMENT_ID where you want your events to be sent to:

GaEvents.Event.adapter = function() {
  return new GaEvents.GTagAdapter(
    {tracker_name: "GA_MEASUREMENT_ID"}

Optional custom object name

The default names of the analytics object for gtag.js is window.gtag(). If you have renamed your analytics object, you can specify the name:

GaEvents.Event.adapter = function() {
  return new GaEvents.GTagAdapter(
    {analytics_object_name: "analytics"} // calls

Google TagManager

If you are using Google Tag Manager you can add custom events which are then passed through to Google Analytics.

GaEvents.Event.adapter = function() {
  return new GaEvents.GoogleTagManagerAdapter("event_name"); // defaults to ga_event

Events are flushed immediatly by default. If you need to wait for user consent you can set GaEvents.Event.require_user_consent = true.

With require_user_consent enabled all events are buffered until GaEvents.Event.user_consent_given = true is set. Events are flushed as soon as GaEvents.Event.flush() is called.


For your testing pleasure we included NullAdapter.

GaEvents.Event.adapter = function() {
  return new GaEvents.NullAdapter();


On the server-side a new event is added to a list, serialized into a container element and then added to your HTML response. On Ajax requests a custom HTTP header is added to the response.

You can create a new event like this:'example_event', { extra: 'dimension' })

On the client-side there is a similar interface to GaEvents:

new GaEvents.Event('example_event', { extra: 'dimension' })

We have taken special care of tracking events while the DOM is loading. Events get collected until the DOM is ready and flushed afterwards.

Too many events

Use something like this snippet to get informed of bloating HTTP headers with event data:

class ApplicationController < ActionController::Base
  after_filter :too_many_ga_events?
  def too_many_ga_events?
    if (serialized = GaEvents::List.to_s).length > 1_024
      notify("GaEvents too big: #{serialized}")


Middlewares aren't loaded in controller specs, so you have to initialize GaEvents by hand. You can do this eg. in your spec_helper.rb:

RSpec.configure do |config|
  config.before(:each, type: :controller) do


Yes please! Use pull requests.


More docs and tools