ServiceWorkerMessageEvent.data

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.

Warning: 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 data read-only property of the ServiceWorkerMessageEvent interface returns the event's data. It can be any data type.

Syntax

var myData = ServiceWorkerMessageEventInstance.data;

Value

Any data type.

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);
        handleChannelMessage(e.data);
      }

      mySW = reg.active;
      mySW.postMessage('hello', [channel.port2]);
  });

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`data`	45	17	44-55 ["Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.", "In Firefox 55 and later, the standard `MessageEvent` interface must be used instead."]	No	24	No	No	45	44-55	24	No	4.0

ServiceWorkerMessageEvent.data

Syntax

Value

Examples

Browser compatibility

See also