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 |
|---|---|---|
| WHATWG HTML Living Standard The definition of 'onopen' in that specification. |
Living Standard | Initial definition |
Browser compatibility
[1] But not service workers as yet.
See also
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