BatteryManager: levelchange event
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
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 # dfn-levelchange |
| Battery Status API # dom-batterymanager-onlevelchange |
Browser compatibility
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levelchange event
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Legend
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- Full support
- Full support
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- No support