EventSource: error event
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
Note: This feature is available in Web Workers.
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