useBattery ​
Reactive Battery Status API, more often referred to as the Battery API, provides information about the system's battery charge level and lets you be notified by events that are sent when the battery level or charging status change. This can be used to adjust your app's resource usage to reduce battery drain when the battery is low, or to save changes before the battery runs out in order to prevent data loss.
Demo ​
isSupported: false
charging: false
chargingTime: 0
dischargingTime: 0
level: 1
Usage ​
js
import { useBattery } from '@vueuse/core'
const { charging, chargingTime, dischargingTime, level } = useBattery()| State | Type | Description |
|---|---|---|
| charging | Boolean | If the device is currently charging. |
| chargingTime | Number | The number of seconds until the device becomes fully charged. |
| dischargingTime | Number | The number of seconds before the device becomes fully discharged. |
| level | Number | A number between 0 and 1 representing the current charge level. |
Use-cases ​
Our applications normally are not empathetic to battery level, we can make a few adjustments to our applications that will be more friendly to low battery users.
- Trigger a special "dark-mode" battery saver theme settings.
- Stop auto playing videos in news feeds.
- Disable some background workers that are not critical.
- Limit network calls and reduce CPU/Memory consumption.
Component Usage ​
This function also provides a renderless component version via the
@vueuse/componentspackage. Learn more about the usage.
vue
<template>
<UseBattery v-slot="{ charging }">
Is Charging: {{ charging }}
</UseBattery>
</template>Type Declarations ​
typescript
export interface BatteryManager extends EventTarget {
charging: boolean
chargingTime: number
dischargingTime: number
level: number
}
/**
* Reactive Battery Status API.
*
* @see https://vueuse.org/useBattery
*/
export declare function useBattery(options?: ConfigurableNavigator): {
isSupported: ComputedRef<boolean>
charging: Ref<boolean, boolean>
chargingTime: Ref<number, number>
dischargingTime: Ref<number, number>
level: Ref<number, number>
}
export type UseBatteryReturn = ReturnType<typeof useBattery>Source ​
Contributors ​
Anthony Fu
Anthony Fu
Tachibana Shin
丶远方
vaakian X
Jelf
Piet Althoff
Shinigami
wheat
Alex Kozack
Antério Vieira