Files
hugo-theme-stack/layouts/_partials/cookies/analytics.html
T
4ad88a327e feat: add GDPR cookie consent banner (#1216)
* feat: add GDPR cookie consent banner

Add a GDPR-compliant cookie consent banner that gates analytics (Google
Analytics) and functional cookies (comments) until user consent is given.

Features:
- Theme-consistent styling using CSS variables (light/dark mode)
- Settings panel with category toggles (necessary, analytics, functional)
- Consent stored in cookie for 365 days
- Google Analytics only loads after analytics consent
- Comments only load after functional consent
- Translations for all 32 supported languages
- Accessible with proper ARIA attributes and focus management

Configuration in hugo.yaml:
  params:
    cookies:
      enabled: true
      categories:
        analytics: true
        functional: true

When cookies.enabled is false, scripts load normally without consent gating.

Closes #412

* refactor: move consent-gated GA to cookies/analytics.html

Move Google Analytics consent logic to avoid shadowing Hugo's internal
`_internal/google_analytics.html` template.

Changes:
- Rename google_analytics.html → cookies/analytics.html
- Update head.html to conditionally load:
  - cookies.enabled=true: cookies/analytics.html (consent-gated)
  - cookies.enabled=false: Hugo's _internal/google_analytics.html
- Align cookies/analytics.html with Hugo's internal template:
  - Support Privacy.GoogleAnalytics.Disable setting
  - Support Privacy.GoogleAnalytics.RespectDoNotTrack setting
  - Add UA- prefix deprecation warning

Note: Custom JS is required for consent-gated GA because Hugo templates
render at build time, but consent happens at runtime. We cannot call
Hugo's internal template after the user grants consent - we must
dynamically inject the GA script via JavaScript.

* style: indent cookies/analytics.html

* refactor: don't use default, put default configurations in params.toml

* fix: don't use `description` as translation key because it's reserved and will throw error

* fix: remove footer/components/custom-font.html call

* fix: banner showSettings key

* style: indent comments/include

* Add missing article.alert translation back

* style: format i18n toml files

* style: indent head/head.html

* style adjustment

* style: add missing -

* style: format demo/config/params.toml

* style: remove redundant comments from cookies.scss

* style: update box-shadow for cookie banner content

---------

Co-authored-by: delize <4028612+delize@users.noreply.github.com>
Co-authored-by: Jimmy Cai <jimmy@cai.im>
2026-02-19 17:21:25 +01:00

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HTML

{{- if not site.Config.Privacy.GoogleAnalytics.Disable -}}
{{- with site.Config.Services.GoogleAnalytics.ID -}}
{{- if strings.HasPrefix (lower .) "ua-" -}}
{{- warnf "Google Analytics 4 (GA4) replaced Google Universal Analytics (UA) effective 1 July 2023. See https://support.google.com/analytics/answer/11583528. Create a GA4 property and data stream, then replace the Google Analytics ID in your site configuration with the new value." -}}
{{- else -}}
{{/* Consent-gated Google Analytics - only loads after analytics consent */}}
<script>
(function() {
var gaId = {{ . }};
var loaded = false;
var respectDNT = {{ site.Config.Privacy.GoogleAnalytics.RespectDoNotTrack }};
function loadGA() {
if (loaded) return;
// Respect Do Not Track browser setting if configured
if (respectDNT) {
var dnt = (navigator.doNotTrack || window.doNotTrack || navigator.msDoNotTrack);
if (dnt == "1" || dnt == "yes") {
return;
}
}
loaded = true;
var script = document.createElement('script');
script.async = true;
script.src = 'https://www.googletagmanager.com/gtag/js?id=' + gaId;
document.head.appendChild(script);
window.dataLayer = window.dataLayer || [];
function gtag(){dataLayer.push(arguments);}
gtag('js', new Date());
gtag('config', gaId);
}
window.addEventListener('onCookieConsentChange', function(e) {
if (e.detail && e.detail.analytics) {
loadGA();
}
});
if (window.cookieConsent && window.cookieConsent.hasConsent('analytics')) {
loadGA();
}
})();
</script>
{{- end -}}
{{- end -}}
{{- end -}}