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Add GA4 tag and countdown/countup event #6

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Merged
vpetersson merged 1 commit into from
Jul 13, 2026
Merged

Add GA4 tag and countdown/countup event #6

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14 changes: 14 additions & 0 deletions assets/static/js/main.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,14 @@ const setLine = (id: string, value: string): void => {
el.hidden = value.length === 0
}

// Send a GA4 event via the gtag stub in index.html. Guarded so the app keeps
// working when Analytics is blocked, offline, or absent (common on signage).
type Gtag = (...args: unknown[]) => void
const track = (event: string, params: Record<string, unknown>): void => {
const gtag = (window as unknown as { gtag?: Gtag }).gtag
if (typeof gtag === 'function') gtag('event', event, params)
}

// Human-readable target datetime for the sub-line, rendered in the chosen zone.
const formatTarget = (targetMs: number, tz: string): string => {
try {
Expand Down Expand Up @@ -86,6 +94,12 @@ const render = (): void => {
document.documentElement.dataset.state = targetMs === null ? 'invalid' : 'ready'
if (targetMs === null) {
setLine('target-line', 'Set a target date to start the timer.')
} else {
// Report once per load whether this timer is counting down to a future
// target or up from a past one — the page reloads periodically, so each
// load re-reports the current mode.
const { direction } = computeState(targetMs, Date.now())
track('timer_direction', { direction: direction === 'down' ? 'countdown' : 'countup' })
}
setLine('message', '')
// paint() fills the target line and digits for a valid target and keeps them
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10 changes: 10 additions & 0 deletions index.html
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Expand Up @@ -2,6 +2,16 @@
<html lang="en">
<head>
<meta charset="utf-8" />
<!-- Google tag (gtag.js) -->
<script async src="https://www.googletagmanager.com/gtag/js?id=G-3V92EN0SBN"></script>
<script>
window.dataLayer = window.dataLayer || []
function gtag() {
dataLayer.push(arguments)
}
gtag('js', new Date())
gtag('config', 'G-3V92EN0SBN')
</script>
<title>Timer</title>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<meta
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