cookieguard/src/services/GoogleAnalytics.js

Handle third party services in compliance with the GDPR

import Service from './Service.js';
import { expireCookie } from '../helpers.js';

export default class GoogleAnalytics extends Service {
    constructor(id, domain, path) {
        super(domain, path);

        this.id = id;
    }

    enable() {
        this._embedScript();

        window.dataLayer = window.dataLayer || [];

        window.gtag = function () {
            dataLayer.push(arguments);
        }

        window.gtag('js', new Date());

        this.config({ anonymize_ip: true });
    }

    config(settings) {
        window.gtag('config', this.id, settings);
    }

    disable() {
        let _gtag = `_gat_gtag_${this.id.replace(/-/g, '_')}`;

        expireCookie('_ga', this.cookie.domain, this.cookie.path);
        expireCookie('_gid', this.cookie.domain, this.cookie.path);
        expireCookie('_gat', this.cookie.domain, this.cookie.path);
        expireCookie(_gtag, this.cookie.domain, this.cookie.path);
    }

    _embedScript() {
        let script = document.createElement('script');
        script.async = true;
        script.src = `https://www.googletagmanager.com/gtag/js?id=${this.id}`;
        document
            .getElementsByTagName('head')[0]
            .appendChild(script, document.getElementsByTagName('head')[0]);
    }
}