Use the event name in methods likeaddEventListener(), or set an event handler property.

addEventListener("messageerror", (event) => { })onmessageerror = (event) => { }

AMessageEvent. Inherits fromEvent.

This interface also inherits properties from its parent,Event.

MessageEvent.dataRead only

The data sent by the message emitter.

MessageEvent.originRead only

A string representing the origin of the message emitter.

MessageEvent.lastEventIdRead only

A string representing a unique ID for the event.

MessageEvent.sourceRead only

AMessageEventSource (which can be aWindowProxy,MessagePort, orServiceWorker object) representing the message emitter.

MessageEvent.portsRead only

An array ofMessagePort 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).

Listen formessageerror usingaddEventListener():

window.addEventListener("messageerror", (event) => {  console.error(event);});

The same, but using theonmessageerror event handler property:

window.onmessageerror = (event) => {  console.error(event);};

• Window.postMessage()
• Related events:message.