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Javascript Battery Status API

Battery Events


// Get the battery API
navigator.getBattery().then(function(battery) {
 battery.addEventListener('chargingchange', function(){
 console.log( 'New charging state: ', battery.charging );
 });
 battery.addEventListener('levelchange', function(){
 console.log( 'New battery level: ', battery.level * 100 + "%" );
 });
 battery.addEventListener('chargingtimechange', function(){
 console.log( 'New time left until full: ', battery.chargingTime, " seconds" );
 });
 battery.addEventListener('dischargingtimechange', function(){
 console.log( 'New time left until empty: ', battery.dischargingTime, " seconds" );
 });
});

Getting current battery level


// Get the battery API
navigator.getBattery().then(function(battery) {
 // Battery level is between 0 and 1, so we multiply it by 100 to get in percents
 console.log("Battery level: " + battery.level * 100 + "%");
});

Output



Is battery charging?


// Get the battery API
navigator.getBattery().then(function(battery) {
 if (battery.charging) {
 console.log("Battery is charging");
 } else {
 console.log("Battery is discharging");
 }
});

Output



Get time left until battery is empty


// Get the battery API
navigator.getBattery().then(function(battery) {
 console.log( "Battery will drain in ", battery.dischargingTime, " seconds" );
});

Output



Get time left until battery is fully charged


// Get the battery API
navigator.getBattery().then(function(battery) {
 console.log( "Battery will get fully charged in ", battery.chargingTime, " seconds" );
});

Output




Conclusion

In this page (written and validated by ) you learned about Javascript Battery Status API . What's Next? If you are interested in completing Javascript tutorial, your next topic will be learning about: Javascript Global error handling in browsers.



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