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.
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 | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'onopen' in that specification. | Living Standard | Initial definition |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 6 | No | 6 | No | Yes | 5 |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | Yes | 18 | No | 45 | 12 | 5 | ? |
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/EventSource/onopen