Deprecation of unload event in google chrome

[oliverfoster]

Subject of the issue

Lars Halkjær from the community forum brings this up on thread https://community.adaptlearning.org/mod/forum/discuss.php?d=4203#p15459

Reference article: https://developer.chrome.com/blog/deprecating-unload/

[oliverfoster]

Places where this may be an impact.

Locations

• Spoor - stateful session
• Spoor - log debug window
• XAPI - Unload statements

Resources

• Google - Page Lifecycle
• SAP - Successfactors - Support for Browser Unload Event in Chrome Is Deleted
• Articulate - Impact of chrome deprecating unload event
• mdn - unload
• mdn - beforeunload
• mdn - pagehide
• caniuse - unload
• caniuse - beforeunload
• caniuse - pagehide

[oliverfoster]

All of the above event listeners are for both beforeunload and unload, it may be wise to add pagehide as well.

SCORM is a non-restorable connection, such that if a user sends LMS_Finish when leaving the page, re-entering the page through browser navigate cannot alone reinitialise the SCORM session. I don't think we need to worry about the bfcache (back/forward browser history cache) as a result.