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EventSource.readyState

The readyState read-only property of the EventSource interface returns a number representing the state of the connection.

Syntax

var myReadyState = eventSource.readyState;

Value

A number representing the state of the connection. Possible values are:

  • 0 — connecting
  • 1 — open
  • 2 — closed

Examples

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

Note: You can find a full example on GitHub — see Simple SSE demo using PHP.

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'readyState' in that specification.
Living Standard Initial definition

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Basic support 6 No 6 No Yes 5
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support Yes 18 No 45 12 5 ?

See also

© 2005–2018 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/EventSource/readyState