Limited availability
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The levelchange event of the BatteryManager interface is fired when the battery level property is updated.
Use the event name in methods like addEventListener(), or set an event handler property.
addEventListener("levelchange", (event) => { })
onlevelchange = (event) => { }
A generic Event.
<div id="level">(battery level unknown)</div>
<div id="stateBattery">(charging state unknown)</div>
navigator.getBattery().then((battery) => {
battery.onlevelchange = () => {
document.querySelector("#level").textContent = battery.level;
if (battery.charging) {
document.querySelector("#stateBattery").textContent = `Charging time: ${
battery.chargingTime / 60
}`;
} else {
document.querySelector("#stateBattery").textContent =
`Discharging time: ${battery.dischargingTime / 60}`;
}
};
});
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