DedicatedWorkerGlobalScope: messageerror event
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2023.
Note: This feature is only available in Dedicated Web Workers.
The messageerror event is fired on a DedicatedWorkerGlobalScope object when it receives a message that can't be deserialized.
This event is not cancellable and does not bubble.
Syntax
Use the event name in addEventListener():
js
addEventListener("messageerror", (event) => { })
Alternatively, assign to the event handler property of the interface:
js
onmessageerror = (event) => { }
Event type
A MessageEvent. Inherits from Event.
Examples
Listen for messageerror using addEventListener():
js
// worker.js
self.addEventListener("messageerror", (event) => {
self.postMessage("Error receiving message");
console.error(event);
});
The same, but using the onmessageerror event handler property (but note that this replaces other event listeners added using onmessageerror, if any):
js
// worker.js
self.onmessageerror = (event) => {
self.postMessage("Error receiving message");
console.error(event);
};
Specifications
| Specification |
|---|
| HTML> # event-messageerror> |
| HTML> # handler-messageeventtarget-onmessageerror> |