www/battery/index.js

var deviceReady = false;

/**
 * Function called when page has finished loading.
 */
function init() {
    document.addEventListener("deviceready", function() {
            deviceReady = true;
            console.log("Device="+device.platform+" "+device.version);
        }, false);
    window.setTimeout(function() {
        if (!deviceReady) {
            alert("Error: Apache Cordova did not initialize.  Demo will not run correctly.");
        }
    },1000);
}

/* Battery */
function updateInfo(info) {
    document.getElementById('level').innerText = info.level;
    document.getElementById('isPlugged').innerText = info.isPlugged;
    if (info.level > 5) {
        document.getElementById('crit').innerText = "false";
    }
    if (info.level > 20) {
        document.getElementById('low').innerText = "false";
    }
}

function batteryLow(info) {
    document.getElementById('low').innerText = "true";
}

function batteryCritical(info) {
    document.getElementById('crit').innerText = "true";
}

function addBattery() {
    window.addEventListener("batterystatus", updateInfo, false);
}

function removeBattery() {
    window.removeEventListener("batterystatus", updateInfo, false);
}

function addLow() {
    window.addEventListener("batterylow", batteryLow, false);
}

function removeLow() {
    window.removeEventListener("batterylow", batteryLow, false);
}

function addCritical() {
    window.addEventListener("batterycritical", batteryCritical, false);
}

function removeCritical() {
    window.removeEventListener("batterycritical", batteryCritical, false);
}

window.onload = function() {
  addListenerToClass('addBattery', addBattery);
  addListenerToClass('removeBattery', removeBattery);
  addListenerToClass('addLow', addLow);
  addListenerToClass('removeLow', removeLow);
  addListenerToClass('addCritical', addCritical);
  addListenerToClass('removeCritical', removeCritical);
  
  addListenerToClass('backBtn', backHome);
  init();
}