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The source read-only property of the MessageEvent interface is a MessageEventSource (which can be a WindowProxy, MessagePort, or ServiceWorker object) representing the message emitter.
Syntax
var mySource = messageEvent.source;
Value
a MessageEventSource (which can be a WindowProxy, MessagePort, or ServiceWorker object) representing the message emitter.
Example
myWorker.onmessage = function(e) {
result.textContent = e.data;
console.log('Message received from worker');
console.log(e.source);
};
Specifications
| Specification | Status | Comment |
|---|---|---|
| Unknown The definition of 'source' in that specification. |
Unknown | Initial definition |
Browser compatibility
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 1 | (Yes) | 4.0 (2.0) | 9 | ? | 10.0+ |
source as MessageEventSource |
(Yes) | ? | 55.0 (55.0) | No support | ? | ? |
| Feature | Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | ? | (Yes) | ? | ? | ? | 3.0+ |
source as MessageEventSource |
? | ? | 55.0 (55.0) | No support | ? | ? |
See also
ExtendableMessageEvent— similar to this interface but used in interfaces that needs to give more flexibility to authors.