@dfds-platform/tracking NPM

@dfds-platform/tracking

Installation

npm install @dfds-platform/tracking
yarn add @dfds-platform/tracking

Setup Google Tag Manager

When using the Tracking Package client side, tracking events are being dispatched to the dataLayer which is where Google Tag Manager picks up events. You have to setup Google Tag Manager to pick up evnets automatically from the dataLayer. You can follow these instructions. Alternatively, you can use an existing package to set up GTM. For example you can use this plugin in a Gatsby applicaiton. **GTM-WZLN3V4** is the Google Tag Manager ID you should use in both development and production.

Tracking events

You can track events multiple ways:

Use the general tracking function track<Event>( {event: 'eventName' ...payload })
⚠️ THIS METHOD IS BEING DEPRECATED Use the old client tracking functions found within ./src/client/general-events
⚠️ THIS METHOD IS BEING DEPRECATED Use the old server tracking functions found within ./src/server/tracking-methods/events see this

Creating a new tracking event

New events should be created by the following method:

Create an event in Stoplight
Export Tracking.json
Overwrite DataContract.json with the downloaded .json
Run yarn run compile:schema within packages/tracking
Create PR; merge; and publish changes

This will update the general tracking function to accept the new event.

⚠️ No events should should be created by using the old pattern of creating a hook/function for each type of event.

Data contract

The data contract is a JSON schema which represents all the events that is accepted. The goal is that no tracking event should ever be instantiated within DFDS which is not defined within this schema. The schema is compiled into a TypeScript function type signature. This can be done by running:

yarn run compile:schema # within packages/tracking

This type contract is only being, and should only be, used by the general tracking function in this repository.

General tracking function

The general tracking function is responsible for two tasks:

Making sure that events being triggered are correctly formatted by using the TypeScript function type signature which is derived from the JSON schema data contract.
Dispatching events to two locations:
- To the dataLayer if in a browser
- To our Server Google Tag Manger server regardless of being in a browser or on a server

In the future all events will be dispatched to Kafka as well.

See deprecation events through linting

Every library consuming the tracking package should have eslint-plugin-deprecation installed such that deprecated events will be shown as follows:

track<Event>({ event: 'fizz' })

The strikethrough will be accompanied with a message on when the event will be obsolete and how change it to complie with a new version of the event, if any.

Tracking context provider setup

⚠️ DO NOT USED THIS CAPABILITY. IT IS CURRENTLY BEING DEPRECATED. Once the code related to the Tracking context provider has been removed through out DFDS this sections should also be removed

Wrap your top app component with TrackingProvider to provide tracking context in order to use various tracking hooks.

import { TrackingProvider } from '@dfds-platform/tracking'

return (
  <TrackingProvider>
    <YourApp />
  </TrackingProvider>
)

Now you can use pre-defined tracking hooks / events. The list of tracking events and their implementation guidelines can be found in "Tracking events" folder. Alternatively, you can dispatch custom javascript events and TrackingProvider will catch and track those events. Additional information can be found in "Custom event listener" folder.

Visit Storybook to see a full list of available tracking hooks.

Developing using `yarn link`

It can be handy to use developing functionality in the context of an existing app. yarn link can be used in that case.

Getting started

A common problem when using yarn link is that you end of with multiple versions of packages (eg. react). This is because dependencies are resolved upwards from within the symlinked react-components folder.

webpack

If you are using webpack you can try setting resolve.symlinks to false in your webpack.config.js to only resolve dependencies from the apps node_modules folder.

Gatsby

Gatsby uses webpack under the hood, so in order to set resolve.symlinks add the following to the gatsby-node.js file

exports.onCreateWebpackConfig = ({ getConfig, actions, stage }) => {
  const config = getConfig()
  config.resolve.symlinks = false
  actions.replaceWebpackConfig(config)
}

Setting up the link

cd ./packages/tracking # Navigate to the packages/tracking folder
yarn run build # Run build which will create a dist folder
yarn run watch # Run watch to watch for changes and re-build
cd ./dist # Navigate into the dist folder
yarn link # Run `yarn link`

You are now ready to use the linked package from within you app while developing. Change to you app source folder, where the package.json file is located, and use the linked version of the @dfds-platform/tracking package

yarn link @dfds-platform/tracking

Publishing new releases

This should always be done the GitHub repositories release page. Create a release here and an automized pipeline will do the rest for you.

Tracking package accepts CustomEvents

⚠️ DO NOT USED THIS CAPABILITY. IT IS CURRENTLY BEING DEPRECATED. Once the code related to CustomEvents has been removed through out DFDS this sections should also be removed

You can dispatch custom javascript events and TrackingProvider will catch and track those events. This might be benefitial if you e.g. are building a microfrontend or a package that is beying implemented in a hosting application that already has tracking package and TrackingProvider installed. Then instead of setting tracking package as dependency for your microfrontend or package, you could rely on the tracking implementation in the hosting application and simply expose custom events that will get captured and tracked by a TrackingProvider in the hosting application. However, if you decide to use CustomEvents instead of the pre-defined tracking hooks, then it is your application and not the tracking package that is fully responsible for those tracking events and their payloads / types. So always make sure that tracking events and their payloads are aligned with the MarTech team.

Example of a CustomEvent dispatch

First, make sure that the hosting application is wrapper in a TrackingProvider (this is where the custom event listener lives) Then you may dispatch a custom event in you app as following:

window.dispatchEvent(
    new CustomEvent('track-event', {
      detail: {
        event: 'formSubmit',
        eventOrigin: 'ukAPI',
        formName: 'ukApi_login',
        formId: 'ukApi_login',
        ..rest,
      },
    })
  )

The name of your CustomEvent must always be 'track-event' event and eventOrigin must always be a part of the event payload. The rest of the event payload will vary depending on an event beying sent.

event - the name of the event that is beying captured by Google Tag Manager
eventOrigin - the name of the microfrontend or package or application where the event is being sent from. Ususally a hardcoded value representing your app, needs to be agreed with MarTech team.

Cypress tests for verify tracking

See docs for testing tracking here

analytics-node nanostores uuid

@infinitebrahmanuniverse/nolb-_df @everything-registry/sub-chunk-239 @dfds-dynamic-forms/forms-ui

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