The onopen property of the EventSource interface is an event handler called when an open event is received, that is when the connection was just opened.
eventSource.onopen = function
evtSource.onopen = function() { console.log("Connection to server opened."); };
Note: You can find a full example on GitHub — see Simple SSE demo using PHP.
| Specification |
|---|
| HTML Standard (HTML) # handler-eventsource-onopen |
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
onopen |
6 |
79 |
6 |
No |
Yes |
5 |
≤37 |
18 |
45 |
12 |
5 |
1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/EventSource/onopen