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EventSource: error event

The error event of the EventSource API is fired when a connection with an event source fails to be opened.

This event is not cancelable and does not bubble.

Syntax

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

js

addEventListener("error", (event) => {});

onerror = (event) => {};

Event type

A generic Event.

Examples

js

const evtSource = new EventSource("sse.php");

// addEventListener version
evtSource.addEventListener("error", (e) => {
  console.log("An error occurred while attempting to connect.");
});

// onerror version
evtSource.onerror = (e) => {
  console.log("An error occurred while attempting to connect.");
};

Specifications

Specification
HTML Standard
# event-error
HTML Standard
# handler-eventsource-onerror

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
error_event 6 79 6 No 12 5 4.4 18 45 12 5 1.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/EventSource/error_event