The ports
read-only property of the MessageEvent
interface is an array of MessagePort
objects representing the ports associated with the channel the message is being sent through (where appropriate, e.g. in channel messaging or when sending a message to a shared worker).
Syntax
var myPorts = messageEvent.ports;
Value
An array of MessagePort
objects.
Example
onconnect = function(e) {
var port = e.ports[0];
port.addEventListener('message', function(e) {
var workerResult = 'Result: ' + (e.data[0] * e.data[1]);
port.postMessage(workerResult);
});
port.start(); // Required when using addEventListener. Otherwise called implicitly by onmessage setter.
}
Specifications
Specification | Status | Comment |
---|---|---|
HTML Living Standard The definition of 'ports' in that specification. |
Living Standard | Initial definition |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
ports | Chrome Full support 1 | Edge Full support 12 | Firefox Full support 4 | IE Full support 9 | Opera Full support Yes | Safari Full support 4 | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support Yes | Opera Android Full support Yes | Safari iOS Full support 3 | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
See also
ExtendableMessageEvent
— similar to this interface but used in interfaces that needs to give more flexibility to authors.