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

onupdateready · WebPlatform Docs

The ApplicationCache object’s cache host is associated with an application cache whose application cache group’s update status is idle, and whose application cache group is not marked as obsolete, but that application cache is not the newest cache in its group.

Property of apis/appcache/ApplicationCacheapis/appcache/ApplicationCache

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

Returns an object of type nullnull

Checking fo the updateready status

window.applicationCache.update();

if (window.applicationCache.status === window.applicationCache.UPDATEREADY) {
   console.log('Cache is now ready for an update');
   
   window.applicationCache.swapCache();
}

Listening for updateready events

window.applicationCache.addEventListener('updateready',function () {
  console.log('The manifest update download has been completed successfully');
}, false);

If this event indicates that the resources have been redownloaded, the script can use swapCache to switch to the new cache. If there is more than one event, the updateready event will be the last one in the sequence. Alternatively, you could use an anonymous delegate function such as

object.onupdateready = function (e) { … }

where e is the cached event.

W3C ApplicationCache Specification

W3C Editor’s Draft

• Microsoft Developer Network: Article

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