https://geoconfirmed.org/js/page-visibility.j8d3k6t9sd.js

1// Tells .NET when the document becomes visible again (tab re-selected, window restored), so a page
2// that stays open for hours can refresh data it has no push signal for. Listener-based on purpose:
3// nothing is assigned to window.*.
4
5/**
6 * Calls `dotNetRef.invokeMethodAsync(methodName)` each time the document turns visible.
7 * @returns {{ dispose: () => void }} Removes the listener; call it when the component goes away.
8 */
9export function observeVisibility(dotNetRef, methodName) {
10    const handler = () => {
11        if (document.visibilityState !== 'visible') return;
12        // The component may be disposing, or the runtime gone; the refresh is best effort.
13        dotNetRef.invokeMethodAsync(methodName).catch(() => { });
14    };
15    document.addEventListener('visibilitychange', handler);
16    return {
17        dispose() {
18            document.removeEventListener('visibilitychange', handler);
19        }
20    };
21}