EventSource: open event

The open event of the EventSource API is fired when a connection with an event source is opened.

Bubbles No
Cancelable No
Interface Event
Event handler property EventSource.onopen

Examples

var evtSource = new EventSource('sse.php');

// addEventListener version
evtSource.addEventListener('open', (e) => {
  console.log("The connection has been established.");
});

// onopen version
evtSource.onopen = (e) => {
  console.log("The connection has been established.");
};

Specifications

Specification Status
HTML Living Standard
The definition of 'open event' in that specification.		 Living Standard

Browser compatibility

BCD tables only load in the browser

See also