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;

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

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.

Specification
HTML Standard (HTML) # dom-eventsource-readystate-dev

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`readyState`	6	79	6	No	Yes	5	≤37	18	45	12	5	1.0