https://www.beautyrest.com/scripts/gtm.js

1/* eslint-disable */
2/**
3 * Google Tag Manager initialization script
4 * Gets brand, environment, containerId, and GTM URL from config values
5 * Uses a page-level flag to prevent duplicate GTM script injection within
6 * the same JS context, while allowing GTM to load on each new page navigation.
7 */
8
9import { getConfigValue } from './configs.js';
10
11// Data Layer Initialization
12window.dataLayer = window.dataLayer || [];
13
14// Module-level flag: resets on every page load (new JS context).
15// Prevents duplicate GTM script injection if initGTM() is called more than
16// once within the same page (e.g. AEM editor soft-refresh or block re-init),
17// without blocking GTM from loading on subsequent full-page navigations.
18let gtmInitializedThisPage = false;
19
20// Initialize GTM with values from config
21async function initGTM() {
22  // Check if GTM is enabled (defaults to true if not specified)
23  const enableGTM = (await getConfigValue('enable-gtm')) || 'true';
24  if (enableGTM === 'false') {
25    return; // Skip GTM initialization if explicitly disabled
26  }
27
28  // Get values from config without defaults
29  const brand = await getConfigValue('brand-name');
30  const environment = await getConfigValue('environment');
31  const containerId = await getConfigValue('gtm-containerId');
32  const gtmUrl = await getConfigValue('gtm-url') || 'https://www.googletagmanager.com/gtm.js';
33
34  // Only initialize if we have a container ID
35  if (!containerId) {
36    console.warn('GTM initialization skipped: No container ID found in config');
37    return;
38  }
39
40  // Guard against duplicate initialization within the same page/JS context.
41  // Using a module-level variable (not sessionStorage) so it resets on each
42  // full page navigation while still protecting against same-page double calls.
43  if (gtmInitializedThisPage) {
44    // Ensure dataLayer has current page context without firing gtm.js event
45    const dataLayerObj = { siteType: 'aem' };
46    if (brand) dataLayerObj.brand = brand;
47    if (environment) dataLayerObj.environment = environment;
48    window.dataLayer.push(dataLayerObj);
49    return;
50  }
51
52  // Prepare dataLayer object with only valid values
53  const dataLayerObj = { siteType: 'aem' };
54
55  // Only add brand and environment if they exist
56  if (brand) dataLayerObj.brand = brand;
57  if (environment) dataLayerObj.environment = environment;
58
59  // Push the variables into the dataLayer
60  window.dataLayer.push(dataLayerObj);
61
62  // Initialize GTM with the container ID and URL from config
63  (function initGTMScript(w, d, s, l, i) {
64    w[l] = w[l] || [];
65    w[l].push({ 'gtm.start': new Date().getTime(), event: 'gtm.js' });
66    const f = d.getElementsByTagName(s)[0];
67    const j = d.createElement(s);
68    const dl = l !== 'dataLayer' ? `&l=${l}` : '';
69    j.async = true;
70    j.src = `${gtmUrl}?id=${i}${dl}`;
71    f.parentNode.insertBefore(j, f);
72  }(window, document, 'script', 'dataLayer', containerId));
73
74  // Mark GTM as initialized for this page load
75  gtmInitializedThisPage = true;
76
77  // GTM initialized with container ID
78}
79
80// Export the function for use in other modules
81export default initGTM;