89 lines
2.7 KiB
TypeScript
89 lines
2.7 KiB
TypeScript
type GtagFn = (...args: unknown[]) => void;
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const TEXT_LIMIT = 80;
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function gtag(): GtagFn | null {
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if (typeof window === 'undefined') return null;
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const fn = (window as unknown as { gtag?: GtagFn }).gtag;
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return typeof fn === 'function' ? fn : null;
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}
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export function trackPageView(path: string, title: string): void {
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const send = gtag();
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if (!send) return;
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send('event', 'page_view', {
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page_path: path,
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page_title: title,
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page_location: window.location.href
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});
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}
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function getLabel(el: HTMLElement): string {
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const aria = el.getAttribute('aria-label');
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if (aria) return aria.trim().slice(0, TEXT_LIMIT);
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const text = (el.textContent ?? '').replace(/\s+/g, ' ').trim();
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if (text) return text.slice(0, TEXT_LIMIT);
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const title = el.getAttribute('title');
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if (title) return title.trim().slice(0, TEXT_LIMIT);
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return '';
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}
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function getLocation(el: HTMLElement): string {
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const dataLoc = el.closest<HTMLElement>('[data-track-location]');
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if (dataLoc?.dataset.trackLocation) {
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return dataLoc.dataset.trackLocation.slice(0, TEXT_LIMIT);
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}
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const section = el.closest<HTMLElement>('section[id]');
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if (section?.id) return section.id;
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if (el.closest('header')) return 'header';
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if (el.closest('footer')) return 'footer';
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if (el.closest('nav')) return 'nav';
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return 'body';
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}
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export function initClickTracking(): () => void {
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if (typeof window === 'undefined') return () => {};
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const handler = (event: MouseEvent) => {
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const send = gtag();
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if (!send) return;
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const target = event.target;
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if (!(target instanceof Element)) return;
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const interactive = target.closest<HTMLElement>('a, button, [role="button"]');
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if (!interactive) return;
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const isLink = interactive.tagName === 'A';
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const label = getLabel(interactive);
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const location = getLocation(interactive);
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const params: Record<string, unknown> = {
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element: isLink ? 'link' : 'button',
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label,
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location,
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page_path: window.location.pathname
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};
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if (isLink) {
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const href = (interactive as HTMLAnchorElement).href;
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if (href) {
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params.link_url = href;
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try {
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const url = new URL(href, window.location.href);
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params.outbound = url.hostname !== window.location.hostname;
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} catch {
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params.outbound = false;
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}
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}
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} else {
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const btn = interactive as HTMLButtonElement;
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if (btn.type) params.button_type = btn.type;
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if (btn.name) params.button_name = btn.name;
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}
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send('event', isLink ? 'link_click' : 'button_click', params);
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};
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document.addEventListener('click', handler, { capture: true });
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return () => document.removeEventListener('click', handler, { capture: true });
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}
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