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.

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

onerror = (event) => {};

Event type

A generic Event.

Examples

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

Docs

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