How Can I Reliably Send AJAX Requests and Execute Scripts Before a User Closes a Browser Window?

Managing Window Closure for AJAX Requests and Scripts in JavaScript

Challenge

Users may leave a webpage through various methods, including closing the window or navigating away via another URL. Determining the moment when a user leaves the page and triggering corresponding actions can be challenging.

Solution

Updated 2024:

• Beacon API: Beacon API offers a reliable solution in modern browsers, ensuring that requests complete even when users leave the page.
• Visibilitychange Event: This event captures the last state change observable in most browsers, including transitions from passive to hidden state.

Implementation

Visibilitychange Event:

Beacon API:

Details

The Beacon API is designed to complete requests even when users leave the page. It's recommended to utilize the visibilitychange event to detect when the user has exited the page, and trigger the Beacon request at that point.

Lifecycle.js Library (for Older Browsers):

For compatibility with older browsers, consider using the lifecycle.js library to manage the page lifecycle.

Considerations

• Adblockers: Adblockers may block Beacon requests to certain tracking domains.
• Cross-site Requests: Beacon requests follow CORS restrictions and include cookies, so ensure appropriate configuration for cross-origin requests.

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