ServiceWorkerGlobalScope.onsync

The ServiceWorkerGlobalScope.onsync event of the ServiceWorkerGlobalScope interface is fired whenever a SyncEvent event occurs. This is triggered when a call to SyncManager.register is made from a service worker client page. The attempt to sync is made either immediately if the network is available or as soon as the network becomes available. 

Syntax

ServiceWorkerGlobalScope.onsync = function(SyncEvent) { ... }
self.addEventListener('sync', function(SyncEvent) { ... })

Specifications

Specification Status Comment
Web Background Synchronization
The definition of 'onsync' in that specification.
Living Standard Adds the onsync event.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Experimental
Chrome Full support 49Edge ? Firefox Full support 44
Notes
Full support 44
Notes
Notes Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR).
IE No support NoOpera Full support 24Safari Full support 11.1WebView Android Full support 49Chrome Android Full support 49Edge Mobile ? Firefox Android Full support 44Opera Android Full support 24Safari iOS Full support 11.1Samsung Internet Android Full support 5.0

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
See implementation notes.
See implementation notes.

Document Tags and Contributors

Contributors to this page: fscholz, chrisdavidmills, rolfedh, jpmedley
Last updated by: fscholz,