The offline event of the Window interface is fired when the browser has lost access to the network and the value of Navigator.onLine switches to false.
Window: offline event
Syntax
Use the event name in methods like addEventListener(), or set an event handler property.
js
addEventListener("offline", (event) => {});
onoffline = (event) => {};
Event type
A generic Event.
Event handler aliases
In addition to the Window interface, the event handler property onoffline is also available on the following targets:
Examples
js
// addEventListener version
window.addEventListener("offline", (event) => {
console.log("The network connection has been lost.");
});
// onoffline version
window.onoffline = (event) => {
console.log("The network connection has been lost.");
};
Specifications
Browser compatibility
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
offline_event |
3 | 12 | 9 | 9 | 15 | 4 | ≤37 | 18 | 9 | 14 | 3 | 1.0 |
See also
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https://developer.mozilla.org/en-US/docs/Web/API/Window/offline_event