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 inWeb Workers.
ThereadyState read-only property of theEventSource interface returns a number representing the state of theconnection.
Value
A number which is one of the three possible state constants defined on theEventSource 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
js
const evtSource = new EventSource("sse.php");console.log(evtSource.readyState);Note:You can find a full example on GitHub — seeSimple SSE demo using PHP.
Specifications
| Specification |
|---|
| HTML # dom-eventsource-readystate-dev |