BatteryManager: levelchange event

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.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("levelchange", (event) => { })

onlevelchange = (event) => { }

Event type

A generic Event.

Example

undefined

HTML

html

<div id="level">(battery level unknown)</div>
<div id="stateBattery">(charging state unknown)</div>

JavaScript

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}`;
    }
  };
});