How to use the cordova.addWindowEventHandler function in cordova

function hookOnlineApis() {
    function proxyEvent(e) {
        cordova.fireWindowEvent(e.type);
    }
    // The network module takes care of firing online and offline events.
    // It currently fires them only on document though, so we bridge them
    // to window here (while first listening for exec()-releated online/offline
    // events).
    window.addEventListener('online', pollOnce, false);
    window.addEventListener('offline', pollOnce, false);
    cordova.addWindowEventHandler('online');
    cordova.addWindowEventHandler('offline');
    document.addEventListener('online', proxyEvent, false);
    document.addEventListener('offline', proxyEvent, false);
}

function hookOnlineApis() {
    function proxyEvent(e) {
        cordova.fireWindowEvent(e.type);
    }
    // The network module takes care of firing online and offline events.
    // It currently fires them only on document though, so we bridge them
    // to window here (while first listening for exec()-releated online/offline
    // events).
    window.addEventListener('online', pollOnceFromOnlineEvent, false);
    window.addEventListener('offline', pollOnceFromOnlineEvent, false);
    cordova.addWindowEventHandler('online');
    cordova.addWindowEventHandler('offline');
    document.addEventListener('online', proxyEvent, false);
    document.addEventListener('offline', proxyEvent, false);
}

function hookOnlineApis() {
    function proxyEvent(e) {
        cordova.fireWindowEvent(e.type);
    }
    // The network module takes care of firing online and offline events.
    // It currently fires them only on document though, so we bridge them
    // to window here (while first listening for exec()-releated online/offline
    // events).
    window.addEventListener('online', pollOnceFromOnlineEvent, false);
    window.addEventListener('offline', pollOnceFromOnlineEvent, false);
    cordova.addWindowEventHandler('online');
    cordova.addWindowEventHandler('offline');
    document.addEventListener('online', proxyEvent, false);
    document.addEventListener('offline', proxyEvent, false);
}

function hookOnlineApis() {
    function proxyEvent(e) {
        cordova.fireWindowEvent(e.type);
    }
    // The network module takes care of firing online and offline events.
    // It currently fires them only on document though, so we bridge them
    // to window here (while first listening for exec()-releated online/offline
    // events).
    window.addEventListener('online', pollOnceFromOnlineEvent, false);
    window.addEventListener('offline', pollOnceFromOnlineEvent, false);
    cordova.addWindowEventHandler('online');
    cordova.addWindowEventHandler('offline');
    document.addEventListener('online', proxyEvent, false);
    document.addEventListener('offline', proxyEvent, false);
}

function hookOnlineApis() {
    function proxyEvent(e) {
        cordova.fireWindowEvent(e.type);
    }
    // The network module takes care of firing online and offline events.
    // It currently fires them only on document though, so we bridge them
    // to window here (while first listening for exec()-releated online/offline
    // events).
    window.addEventListener('online', pollOnceFromOnlineEvent, false);
    window.addEventListener('offline', pollOnceFromOnlineEvent, false);
    cordova.addWindowEventHandler('online');
    cordova.addWindowEventHandler('offline');
    document.addEventListener('online', proxyEvent, false);
    document.addEventListener('offline', proxyEvent, false);
}

function hookOnlineApis() {
    function proxyEvent(e) {
        cordova.fireWindowEvent(e.type);
    }
    // The network module takes care of firing online and offline events.
    // It currently fires them only on document though, so we bridge them
    // to window here (while first listening for exec()-releated online/offline
    // events).
    window.addEventListener('online', pollOnceFromOnlineEvent, false);
    window.addEventListener('offline', pollOnceFromOnlineEvent, false);
    cordova.addWindowEventHandler('online');
    cordova.addWindowEventHandler('offline');
    document.addEventListener('online', proxyEvent, false);
    document.addEventListener('offline', proxyEvent, false);
}

function hookOnlineApis() {
    function proxyEvent(e) {
        cordova.fireWindowEvent(e.type);
    }
    // The network module takes care of firing online and offline events.
    // It currently fires them only on document though, so we bridge them
    // to window here (while first listening for exec()-releated online/offline
    // events).
    window.addEventListener('online', pollOnceFromOnlineEvent, false);
    window.addEventListener('offline', pollOnceFromOnlineEvent, false);
    cordova.addWindowEventHandler('online');
    cordova.addWindowEventHandler('offline');
    document.addEventListener('online', proxyEvent, false);
    document.addEventListener('offline', proxyEvent, false);
}

function hookOnlineApis() {
    function proxyEvent(e) {
        cordova.fireWindowEvent(e.type);
    }
    // The network module takes care of firing online and offline events.
    // It currently fires them only on document though, so we bridge them
    // to window here (while first listening for exec()-releated online/offline
    // events).
    window.addEventListener('online', pollOnceFromOnlineEvent, false);
    window.addEventListener('offline', pollOnceFromOnlineEvent, false);
    cordova.addWindowEventHandler('online');
    cordova.addWindowEventHandler('offline');
    document.addEventListener('online', proxyEvent, false);
    document.addEventListener('offline', proxyEvent, false);
}

function hookOnlineApis() {
    function proxyEvent(e) {
        cordova.fireWindowEvent(e.type);
    }
    // The network module takes care of firing online and offline events.
    // It currently fires them only on document though, so we bridge them
    // to window here (while first listening for exec()-releated online/offline
    // events).
    window.addEventListener('online', pollOnceFromOnlineEvent, false);
    window.addEventListener('offline', pollOnceFromOnlineEvent, false);
    cordova.addWindowEventHandler('online');
    cordova.addWindowEventHandler('offline');
    document.addEventListener('online', proxyEvent, false);
    document.addEventListener('offline', proxyEvent, false);
}

var Battery = function () {
    this._level = null;
    this._isPlugged = null;
    // Create new event handlers on the window (returns a channel instance)
    this.channels = {
        batterystatus: cordova.addWindowEventHandler('batterystatus'),
        batterylow: cordova.addWindowEventHandler('batterylow'),
        batterycritical: cordova.addWindowEventHandler('batterycritical')
    };
    for (var key in this.channels) {
        this.channels[key].onHasSubscribersChange = Battery.onHasSubscribersChange;
    }
};