Obsolete
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
The levelchange event is fired when the level attribute of the battery API has changed.
BatteryManagerThe event callback doesn't receive any event objects, but properties can be read from the BatteryManager object received from the navigator.getBattery method.
| Property | Type | Description |
|---|---|---|
BatteryManager.level | double (float) | The system's battery charging level scaled from 0 to 1.0. Returns 0 if the battery is empty and the system is about to suspend. Returns 1.0 if the battery is full, if the implementation is unable to report the battery's level, or if there is no battery attached to the system. Read only. |
navigator.getBattery().then(function(battery) {
console.log("Battery level: " + battery.level * 100 + " %");
battery.addEventListener('levelchange', function() {
console.log("Battery level: " + battery.level * 100 + " %");
});
});
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https://developer.mozilla.org/en-US/docs/Web/Events/levelchange