The ononline property of the WorkerGlobalScope interface represents an EventHandler to be called when the online event occurs and bubbles through the Worker.


self.ononline = function() { ... };


The following code snippet shows an ononline handler set inside a worker:

self.ononline = function() {
  console.log('Your worker is now online');


Specification Status Comment
HTML Living Standard
The definition of 'WorkerGlobalScope.ononline' in that specification.
Living Standard

Browser compatibility

ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
ononlineChrome Full support 4Edge Full support ≤79Firefox Full support 29IE ? Opera ? Safari ? WebView Android Full support YesChrome Android Full support 40Firefox Android Full support 29Opera Android ? Safari iOS ? Samsung Internet Android Full support 4.0


Full support
Full support
Compatibility unknown
Compatibility unknown

See also

The WorkerGlobalScope interface it belongs to.