Deprecated
This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
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="stateBattery">(charging state unknown)</div>
JavaScript
navigator.getBattery().then(function(battery) {
battery.onlevelchange = function(){
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 | Status | Comment |
---|---|---|
Battery Status API | Candidate Recommendation | Initial definition |
Browser compatibility
BCD tables only load in the browser