Deprecated
This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Important: In modern browsers, this property has been deprecated.
Service worker messages will now use the MessageEvent
interface, for
consistency with other web messaging features.
The source
read-only property of the
ServiceWorkerMessageEvent
interface returns an array of
MessagePort
objects connected with the message channel the message is
being sent through.
Syntax
var myPorts = ServiceWorkerMessageEventInstance.ports;
Value
An array of MessagePort
objects.
Examples
When the following code is used inside the main thread to set up a message channel
between it and a service worker for sending messages between the two, the event object
of onmessage
will be a ServiceWorkerMessageEvent
.
navigator.serviceWorker.ready.then(function(reg) {
...
// set up a message channel to communicate with the SW
var channel = new MessageChannel();
channel.port1.onmessage = function(e) {
console.log(e.ports);
handleChannelMessage(e.data);
}
mySW = reg.active;
mySW.postMessage('hello', [channel.port2]);
});
Browser compatibility
BCD tables only load in the browser