rakeen/battery-checker

initQuote();
initBattery();


function initQuote(){
    var quoteUrl1 = 'http://quotes.stormconsultancy.co.uk/random.json';  
    var quoteUrl2 = './quote.json';

    var req1 = fetch(quoteUrl1);
    var req2 = fetch(quoteUrl2);

    Promise.race([req1,req2]).
            then(function(res){
                res.json().then(function(data){
                    var q;
                    if(data.local==="yes")    q=randLocal(data.quotes);
                    else q=data.quote;
                    document.querySelector('.quote').textContent = q;
                });
            }).
            catch(function(err){
                console.error('Error:\t'+err);
            });


    function randLocal(d){
        var len = d.length;
        var rand = parseInt( Math.random()*100 );
        rand = rand%len;
        return d[rand];
    }
}


function initBattery(){
    
    if(typeof navigator.getBattery === "undefined"){
        document.querySelector('#dinosaur').style.display = 'block';
        console.error('you\'re a dinosaur');
    }
    else{
        var battery = navigator.getBattery();  
        battery.then(function(res){
            console.log(res);
            window.battery = res;
            window.indicator = document.querySelector('#indicator');

            res.addEventListener('chargingchange',updateBatteryStatus);
            res.addEventListener('levelchange',updateBatteryStatus);
            updateBatteryStatus();
        });
    }

}


function updateBatteryStatus(){

    if(battery.level*100 === 100) indicator.style.width = '97%'; /* or else it overflows */
    else indicator.style.width = battery.level * 100 + '%';


    console.log();

    var lvl = battery.level*100 + ' %';
    indicator.className = battery.charging ? 'charging' : 'notCharging';

    document.querySelector('.indicator-info').textContent = battery.charging ? 'Plugged-In '+lvl : 'Not Charging '+lvl;        
    document.querySelector('.discharge').textContent = battery.dischargingTime===Infinity ? "Discharging Time:\t Infinity" : "Discharging Time:\t "+ parseInt(battery.dischargingTime/60);
}