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

BCD tables only load in the browser

See also