cordova plugin add cordova-plugin-network-information

if(navigator.connection.type == "none"){
        $ionicLoading.hide()
        $ionicPopup.alert({
            title: "Internet Disconnected",
            content: "There is no internet connection. Please check the connection and try again."
        })
        .then(function(result) {
            ionic.Platform.exitApp();
        });
    }