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.
js
addEventListener("levelchange", (event) => { })
onlevelchange = (event) => { }
Event type
A generic Event
.
Example
HTML
html
<div id="level">(battery level unknown)</div>
<div id="stateBattery">(charging state unknown)</div>
JavaScript
js
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}`;
}
};
});
Specifications
Specification |
---|
Battery Status API # ref-for-dfn-levelchange-1 |
Battery Status API # dom-batterymanager-onlevelchange |
Browser compatibility
BCD tables only load in the browser