BroadcastChannel.onmessage

The BroadcastChannel.onmessage event handler is a property that specifies the function to execute when a message event, of type MessageEvent, is received by this BroadcastChannel. Such an event is sent by the browser with a message broadcasted to the channel.

Note: This feature is available in Web Workers.

Syntax

channel.onmessage = function;

Values

  • function is the name of a user-defined function, without the () suffix or any parameters, or an anonymous function declaration, such as function(event) {...}. An event handler always has one single parameter, containing the event, here of type MessageEvent.

Example

bc.onmessage = function(ev) { console.log(`message event received! '${ev.data}'`); };

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'BroadcastChannel.onmessage' in that specification.
Living Standard Initial definition.

Browser compatibility

DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
onmessageChrome Full support 54Edge Full support ≤79Firefox Full support 38IE No support NoOpera Full support 41Safari No support NoWebView Android Full support 54Chrome Android Full support 54Firefox Android ? Opera Android Full support 41Safari iOS No support NoSamsung Internet Android Full support 6.0

Legend

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

See also

  • Another, more heavy weight, way of communicating between browser contexts: ServiceWorker