How can I find the values of draggable location

Question

var source, destination;

var directionsDisplay;

var directionsService = new google.maps.DirectionsService();

google.maps.event.addDomListener(window, 'load', function () {

var input = document.getElementById('txtSource');

var input1 = document.getElementById('txtDestination');

// var autocomplete = new google.maps.places.Autocomplete(input);

//var autocomplete1 = new google.maps.places.Autocomplete(input1);

new google.maps.places.SearchBox(document.getElementById('txtSource'));

new google.maps.places.SearchBox(document.getElementById('txtDestination'));

directionsDisplay = new google.maps.DirectionsRenderer({ 'draggable': true });

});

window.onload = function () {

GetRoute();

}

function GetRoute() {

var Tuticorin = new google.maps.LatLng(8.7948098,78.1190259);

var mapOptions = {

zoom: 12,

center: Tuticorin

};

map = new google.maps.Map(document.getElementById('dvMap'), mapOptions);

directionsDisplay.setMap(map);

directionsDisplay.setPanel(document.getElementById('dvPanel'));

//*********DIRECTIONS AND ROUTE**********************//

source = document.getElementById("txtSource").value;

destination = document.getElementById("txtDestination").value;

var request = {

origin: source,

destination: destination,

travelMode: google.maps.TravelMode.DRIVING

};

directionsService.route(request, function (response, status) {

if (status == google.maps.DirectionsStatus.OK) {

directionsDisplay.setDirections(response);

}

});

var m1 = document.getElementById("map-cir1");

var m2 = document.getElementById("map-cir2");

if (source=="" && destination=="") {

m1.style.display = "none";

m2.style.display = "block";

} else {

m1.style.display = "block";

m2.style.display = "none";

}

//*********DISTANCE AND DURATION**********************//

var service = new google.maps.DistanceMatrixService();

service.getDistanceMatrix({

origins: [source],

destinations: [destination],

travelMode: google.maps.TravelMode.DRIVING,

unitSystem: google.maps.UnitSystem.METRIC,

avoidHighways: false,

avoidTolls: false

}, function (response, status) {

if (status == google.maps.DistanceMatrixStatus.OK && response.rows[0].elements[0].status != "ZERO_RESULTS")

{

var x1 = response.rows[0].elements[0].distance.value;

var x2 = response.rows[0].elements[0].duration.text;

var locationnew = document.getElementById("locationnew");

var dvDistance = document.getElementById("dvDistance");

var dvDuration = document.getElementById("dvDuration");

var source = document.getElementById("txtSource");

var destination = document.getElementById("txtDestination");