Capturing Window Closing Events in JavaScript
Identifying user page abandonment is crucial in web analytics. This article explores techniques to detect when a user closes a browser tab or navigates away from a specific page.
Window.close Event
Previously, the window.close event provided a reliable method for tracking window closures. However, changes in page lifecycle management render this event less reliable.
Visibilitychange Event
For modern browsers, the visibilitychange event offers a more accurate representation of when a user exits a page. This event triggers when the page's visibility state transitions from visible to hidden.
document.addEventListener('visibilitychange', function() { if (document.visibilityState === "hidden") { // Perform actions on page exit } });
Beacon API
For comprehensive cross-browser support, consider using the Beacon API. Beacon requests are designed to complete even when a user leaves the page, ensuring data capture of sessions and analytics.
var url = "https://example.com/foo"; var data = "bar"; navigator.sendBeacon(url, data);
Lifecycle.js Library
For compatibility with legacy browsers, the lifecycle.js library provides additional support. It implements best practices for the page lifecycle, ensuring reliable event handling.
lifecycle.addEventListener('statechange', function(event) { if (event.originalEvent === 'visibilitychange' && event.newState === 'hidden') { navigator.sendBeacon(url, data); } });
Considerations
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