The readyState read-only property of the EventSource interface returns a number representing the state of the connection.
var myReadyState = eventSource.readyState;
A number representing the state of the connection. Possible values are:
0 — connecting1 — open2 — closedvar evtSource = new EventSource('sse.php');
console.log(evtSource.readyState); Note: You can find a full example on GitHub — see Simple SSE demo using PHP.
| Specification | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'readyState' in that specification. | Living Standard | Initial definition |
| 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 | ? |
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https://developer.mozilla.org/en-US/docs/Web/API/EventSource/readyState