https://www.theodorehq.com/atlas/source-capture.js

1/* Attribution capture + Polar checkout metadata - Content ROI.
2   Loaded on every Atlas page. Captures the first-touch landing path of the
3   session and forwards it onto Polar checkout links/buttons as metadata, so the
4   analytics dashboard can attribute each sale to the page that earned the visit.
5
6   The dashboard reads order.metadata.landing_path (primary) or .ta_landing
7   (fallback) and matches it against Umami entry-page paths. Value is a bare
8   pathname (window.location.pathname) - no domain, query or hash.
9
10   NOTE: custom metadata via checkout-LINK query params is best-effort per Polar
11   docs (they document only reference_id + utm_* as link params; custom metadata
12   officially needs the Checkout API). We send both metadata[landing_path] and a
13   reference_id backstop, and verify with a test purchase. If metadata[] does not
14   land on order.metadata, switch to a server-side Checkout Session. */
15(function () {
16  var STORAGE;
17  try { STORAGE = window.localStorage; } catch (e) { return; }
18
19  function setIfMissing(key, value) {
20    if (!value) return;
21    try { if (!STORAGE.getItem(key)) STORAGE.setItem(key, value); } catch (e) {}
22  }
23
24  /* ---- Capture first-touch attribution (never overwritten on later pages) ---- */
25  try {
26    var params = new URLSearchParams(window.location.search);
27    var refHost = null;
28    if (document.referrer) {
29      try {
30        var ru = new URL(document.referrer);
31        if (ru.hostname && ru.hostname !== window.location.hostname) {
32          refHost = ru.hostname.replace(/^www\./, '');
33        }
34      } catch (e) {}
35    }
36    setIfMissing('ta_source', params.get('utm_source') || refHost);
37    setIfMissing('ta_medium', params.get('utm_medium'));
38    setIfMissing('ta_campaign', params.get('utm_campaign'));
39    setIfMissing('ta_term', params.get('utm_term'));
40    setIfMissing('ta_content', params.get('utm_content'));
41    setIfMissing('ta_ref', refHost);
42    setIfMissing('ta_landing', window.location.pathname); // the entry page that earned the visit
43    setIfMissing('ta_first_at', new Date().toISOString());
44  } catch (e) {}
45
46  /* ---- Build a Polar checkout URL carrying attribution + landing_path ---- */
47  function buildPolarUrl(rawUrl) {
48    var u;
49    try { u = new URL(rawUrl, window.location.origin); } catch (e) { return rawUrl; }
50    var utm = { utm_source: 'ta_source', utm_medium: 'ta_medium', utm_campaign: 'ta_campaign', utm_term: 'ta_term', utm_content: 'ta_content' };
51    Object.keys(utm).forEach(function (k) {
52      var v = STORAGE.getItem(utm[k]); if (v) u.searchParams.set(k, v);
53    });
54    var landing = STORAGE.getItem('ta_landing') || window.location.pathname || '';
55    var firstAt = STORAGE.getItem('ta_first_at') || '';
56    if (landing) {
57      u.searchParams.set('metadata[landing_path]', landing); // primary key the dashboard reads
58      u.searchParams.set('metadata[ta_landing]', landing);   // fallback key
59    }
60    // Officially-supported backstop: reference_id -> order.metadata.reference_id
61    var refId = ['atlas', landing, firstAt].filter(Boolean).join('|');
62    if (refId) u.searchParams.set('reference_id', refId);
63    return u.toString();
64  }
65  window.atlasBuildCheckout = buildPolarUrl; // used by demo.js buy buttons
66
67  /* ---- Intercept clicks on static Polar checkout links (e.g. blog CTAs) ---- */
68  document.addEventListener('click', function (e) {
69    var link = e.target.closest ? e.target.closest('a[href*="buy.polar.sh"]') : null;
70    if (!link) return;
71    e.preventDefault();
72    var url = buildPolarUrl(link.getAttribute('href'));
73    try {
74      if (typeof umami !== 'undefined' && umami.track) {
75        umami.track('purchase_click', { source: STORAGE.getItem('ta_source') || 'direct', product: 'atlas' });
76      }
77    } catch (e) {}
78    setTimeout(function () { window.location.href = url; }, 120);
79  });
80
81  /* ---- Keep the footer copyright year current (house standard) ---- */
82  function atlasUpdateCopyYear() {
83    var y = String(new Date().getFullYear());
84    var els = document.querySelectorAll('.copy-year');
85    for (var i = 0; i < els.length;

85 i++) els[i].textContent = y;
86  }
87  if (document.readyState === 'loading') {
88    document.addEventListener('DOMContentLoaded', atlasUpdateCopyYear);
89  } else {
90    atlasUpdateCopyYear();
91  }
92})();