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React Google Tag Manager
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README.md

react-gtm

React Google Tag Manager

This is a Javascript module to React based apps that implement Google Tag Manager. It is designed to use GTM snnipets.

You can easily use custom dataLayer, multiple dataLayers and additional events, as well as environments.

Fork

This is a fork from https://github.com/alinemorelli/react-gtm with the following improvements (from https://github.com/alinemorelli/react-gtm/commit/d075e27a84970e5f7b6a0ecf38119331fbdfc877)

  • Environments (recent GTM feature)
  • Use of HTTPS by default (instead of HTTP)
  • Different way of using events (followed the official documentation), which doesn't recreate a new <script> tag at every call (see https://github.com/alinemorelli/react-gtm/issues/3)
  • Renamed the package from react-gtm-module to react-gtm
  • Added more tests

Installation

npm:

npm install Vadorequest/react-gtm#2.0.0 --save

Staging environment

GTM has released Environments quite recently, and they're very useful to test your setup in a particular environment.

If you have a staging/preprod environment and would like to know more about it, see https://www.simoahava.com/analytics/better-qa-with-google-tag-manager-environments/

Otherwise, just ignore everything related to staging in the documentation, it's optional anyway.

Usage

Properties

Value Type Required Notes
id String Yes GTM id, must be something like GTM-000000.
auth String No When using a staging environment
preview String No When using a staging environment
dataLayer Object No Object that contains all of the information that you want to pass to Google Tag Manager.
dataLayerName String No Custom name for dataLayer object.
events Object No Additional events such as 'gtm.start': new Date().getTime(),event:'gtm.js'.

Initializing GTM Module:

import React from 'react'
import ReactDOM from 'react-dom'
import Router from 'react-router'
import routes from './routes'

...
import TagManager from 'react-gtm'

const tagManagerArgs = {
    id: 'GTM-000000',
    auth: 'KDJ8JDhbskdshzjz73kals', // Optional, see GTM => Admin => Environments, useful when using staging environment
    preview: 'env-2' // Optional
}

TagManager.initialize(tagManagerArgs)
...

const app = document.getElementById('app')
ReactDOM.render(<Router routes={routes} />, app)

DataLayer

Custom dataLayer example:

import React from 'react'
import ReactDOM from 'react-dom'
import Router from 'react-router'
import routes from './routes'

...
import TagManager from 'react-gtm'

const tagManagerArgs = {
    id: 'GTM-000000',
    dataLayer: {
        userId: '001',
        userProject: 'project'
    }
}

TagManager.initialize(tagManagerArgs)
...

const app = document.getElementById('app')
ReactDOM.render(<Router routes={routes} />, app)

Multiple dataLayer example:

If you need send multiple custom dataLayer you can initialize GTM Module on different components sending different dataLayers

You can initialize it normally:

import React from 'react'
import ReactDOM from 'react-dom'
import Router from 'react-router'
import routes from './routes'

...
import TagManager from 'react-gtm'

const tagManagerArgs = {
    id: 'GTM-000000',
    dataLayerName: 'PageDataLayer'
}

TagManager.initialize(tagManagerArgs)
...

const app = document.getElementById('app')
ReactDOM.render(<Router routes={routes} />, app)

And send your data in each page you want

import React from 'react'

...
import TagManager from 'react-gtm'

const tagManagerArgs = {
    dataLayer: {
        userId: '001',
        userProject: 'project',
        page: 'home'
    },
    dataLayerName: 'PageDataLayer'
}
...

const Home = () => {
    ...
    TagManager.dataLayer(tagManagerArgs)
    ...

    return (
        <div className='home'>
            //your component code
        </div>
    )
}

export default Home

Pre-defined Events

Example:

import React from 'react'
import ReactDOM from 'react-dom'
import Router from 'react-router'
import routes from './routes'

...
import TagManager from 'react-gtm'

const tagManagerArgs = {
    id: 'GTM-000000',
    events: {
        sendUserInfo: 'userInfo'
    }
}

TagManager.initialize(tagManagerArgs)
...

const app = document.getElementById('app')
ReactDOM.render(<Router routes={routes} />, app)

Dynamic events

See official documentation for proper usage: https://developers.google.com/tag-manager/devguide#events

import React from 'react'

import TagManager from 'react-gtm'

const tagManagerArgs = {
    id: 'GTM-000000'
}

TagManager.initialize(tagManagerArgs)

// Later, in the same file or another file, you can use TagManager.sendEvent or just import sendEvent
import {sendEvent} from 'react-gtm'

<button onclick={() => sendEvent({'event': 'button1-click'})} />

<button onclick={() => sendEvent({
  'event': 'customizeCar',
  'color': 'red',
  'conversionValue': 50
})} />

Get the DataLayer from DOM

Once you have initialized the GTM in your page, you can get the dataLayer from TagManager.getExistingDataLayer or import { getExistingDataLayer } from 'react-gtm'

During the initialize, a global variable is created, storing the key used to store the dataLayer, which allows to retrieve it later on.

You can also just use window.dataLayer if you're not using a custom 'dataLayerName'. (which is the default behavior)

Know issues

  • When using a custom dataLayerName, the test kinda fail (they've been deactivated for this particular use case) I do not know if it's an issue with the tests itself (seems likely), or with the feature. Nevertheless, if you use a custom dataLayerName, be aware of that and make sure it works properly.

Notes:

  • Disabling javascript in the browser can prevent the correct operation of this library if React is only being rendered on the client side.
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