BatteryManager.onlevelchange - Web APIs 编辑

Obsolete

This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.

The BatteryManager.onlevelchange property specifies an event listener to receive levelchange events. These events occur when the battery level is updated.

Syntax

navigator.battery.onlevelchange = funcRef

Where battery is a BatteryManager object, and funcRef is a function to be called when the levelchange event occurs.

Example

HTML

<div id="level">(battery level unknown)</div>
<div id="stateBaterry">(charging state unknown)</div>

JavaScript

navigator.getBattery().then(function(battery) {
  battery.onlevelchange = function(){
    document.querySelector('#level').textContent = battery.level;

    if(battery.charging) {
      document.querySelector('#stateBaterry').textContent =
          "Charging time: " + (battery.chargingTime / 60);
    }
    else {
      document.querySelector('#stateBaterry').textContent =
          "Discharging time: " + (battery.dischargingTime / 60);
    }
  };
});

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• BatteryManager
• Navigator.getBattery