EventSource.close()

The close() method of the EventSource interface closes the connection, if one is made, and sets the EventSource.readyState attribute to 2 (closed).

Note: If the connection is already closed, the method does nothing.

Syntax

eventSource.close();

Parameters

None.

Return value

Void.

Examples

var button = document.querySelector('button');
var evtSource = new EventSource('sse.php');
button.onclick = function() {
  console.log('Connection closed');
  evtSource.close();
}

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 'close()' in that specification.	Living Standard	Initial definition

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.