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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/BatteryManager/chargingchange_event below:

BatteryManager: chargingchange event - Web APIs

BatteryManager: chargingchange event

Limited availability

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The chargingchange event of the BatteryManager interface is fired when the battery charging property is updated.

Syntax

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

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

onchargingchange = (event) => { }
Event type

A generic Event.

Example HTML
<div id="level">(battery level unknown)</div>
<div id="chargingTime">(charging time unknown)</div>
JavaScript
navigator.getBattery().then((battery) => {
  battery.onchargingchange = () => {
    document.querySelector("#level").textContent = battery.level;
    document.querySelector("#chargingTime").textContent = battery.chargingTime;
  };
});
Specifications Browser compatibility See also

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