EventSource: open event

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  1. Examples
  2. Specifications
  3. Browser compatibility
  4. See also

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

No compatibility data found. Please contribute data for "api.EventSource.open_event" (depth: 1) to the MDN compatibility data repository.

See also

Document Tags and Contributors

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Contributors to this page: chrisdavidmills, irenesmith, mdnwebdocs-bot, fscholz, teoli, Sheppy, ethertank, louisremi
Last updated by: chrisdavidmills,