この記事はまだボランティアによって 日本語 に翻訳されていません。ぜひ MDN に参加して翻訳を手伝ってください！
The levelchange event is fired when the level attribute of the battery API has changed.
General info
- Specification
- Battery
- Interface
- Event
- Bubbles
- No
- Cancelable
- No
- Target
BatteryManager- Default Action
- None
Properties
The event callback doesn't receive any event objects, but properties can be read from the BatteryManager object received from the navigator.getBattery method.
| Property | Type | Description |
BatteryManager.level |
double (float) | The system's battery charging level scaled from 0 to 1.0. Returns 0 if the battery is empty and the system is about to suspend. Returns 1.0 if the battery is full, if the implementation is unable to report the battery's level, or if there is no battery attached to the system. Read only. |
Example
navigator.getBattery().then(function(battery) {
console.log("Battery level: " + battery.level * 100 + " %");
battery.addEventListener('levelchange', function() {
console.log("Battery level: " + battery.level * 100 + " %");
});
});