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Showing content from https://webplatform.github.io/docs/apis/appcache/ApplicationCache/onobsolete below:

onobsolete · WebPlatform Docs

The Webpage is associated with an application cache whose group is marked as obsolete.

Property of apis/appcache/ApplicationCacheapis/appcache/ApplicationCache

var result = window.applicationCache.onobsolete;
window.applicationCache.onobsolete = value;

Returns an object of type nullnull

Checking fo the obsolete status

window.applicationCache.update();



if (window.applicationCache.status === window.applicationCache.OBSOLETE) {
   console.log('The cache manifest is gone!');
}

Listening for obsolete events

window.applicationCache.addEventListener('obsolete',function () {
   console.log('The cache manifest is gone!');
}, false);

If the manifest file can’t be found, the cache is considered to be deleted. If there is more than one event, the obsolete event will be the last one in the sequence. Alternatively, you could use an anonymous delegate function such as

object.onobsolete = function (e) { … }

where e is the cached event.

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