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 vaues are:
0— connecting1— open2— 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 |
|---|---|---|
| WHATWG HTML Living Standard The definition of 'readyState' in that specification. |
Living Standard | Initial definition |
Browser compatibility
| Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| EventSource support | 6 | No support | 6.0 (6.0) | No support | (Yes) | 5 |
| Available in shared and dedicated workers[1] | (Yes) | No support | 53.0 (53.0) | No support | (Yes) | (Yes) |
| Feature | Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| EventSource support | 4.4 | 45 | No support | 12 | 4.1 |
| Available in shared and dedicated workers[1] | (Yes) | 53.0 (53.0) | No support | (Yes) | (Yes) |
[1] But not service workers as yet.
See also
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