SharedWorkerGlobalScope: connect event

The connect event is fired in shared workers at their SharedWorkerGlobalScope when a new client connects.

Bubbles No
Cancelable No
Interface MessageEvent
Event handler property SharedWorkerGlobalScope.onconnect

Examples

This example shows a shared worker file — when a connection to the worker occurs from a main thread via a MessagePort, the onconnect event handler fires. The event object is a MessageEvent.

The connecting port can be referenced through the event object's ports parameter; this reference can have an onmessage handler attached to it to handle messages coming in through the port, and its postMessage() method can be used to send messages back to the main thread using the worker.

self.onconnect = function(e) {
    var port = e.ports[0];

    port.onmessage = function(e) {
      var workerResult = 'Result: ' + (e.data[0] * e.data[1]);
      port.postMessage(workerResult);
    }

    port.start();
}

For a complete running example, see our Basic shared worker example (run shared worker.)

addEventListener equivalent

You could also set up an event handler using the addEventListener() method:

self.addEventListener('connect', function(e) {
  var port = e.ports[0];

  port.onmessage = function(e) {
    var workerResult = 'Result: ' + (e.data[0] * e.data[1]);
    port.postMessage(workerResult);
  }

});

Specifications

Specification Status
HTML Living Standard
The definition of 'connect event' in that specification.
Living Standard

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
connect eventChrome No support NoEdge ? Firefox Full support 29IE No support NoOpera Full support 10.6Safari No support NoWebView Android Full support YesChrome Android Full support 18Edge Mobile ? Firefox Android Full support 29Opera Android Full support YesSafari iOS ? Samsung Internet Android Full support Yes

Legend

Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also

Document Tags and Contributors

Contributors to this page: mfuji09, chrisdavidmills, mdnwebdocs-bot, mfluehr, Claas
Last updated by: mfuji09,