EventSource: readyState property
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since January 2020.
Note: This feature is available in Web Workers.
The readyState
read-only property of the
EventSource
interface returns a number representing the state of the
connection.
Value
A number which is one of the three possible state constants defined on the EventSource
interface:
EventSource.CONNECTING
(0)-
The connection is not yet open.
EventSource.OPEN
(1)-
The connection is open and ready to communicate.
EventSource.CLOSED
(2)-
The connection is closed or couldn't be opened.
Examples
const 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 |
---|
HTML # dom-eventsource-readystate-dev |
Browser compatibility
Report problems with this compatibility data on GitHubdesktop | mobile | server | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
readyState |
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support