EventSource.onopen

The onopen property of the EventSource interface is an EventHandler called when an open event is received, that is when the connection was just opened.

Syntax

eventSource.onopen = function

Examples

evtSource.onopen = function() {
  console.log("Connection to server opened.");
};

Note: You can find a full example on GitHub — see Simple SSE demo using PHP.

Specifications

Specification Status Comment
HTML Living Standard
The definition of 'onopen' in that specification.
Living Standard Initial definition

Browser compatibility

BCD tables only load in the browser

See also