Question about Google Map get direction service V3 - google-maps

Question

I want to use Direction service of google map for my website. Since I use it first time, I don't know how to start with it. One good example code that is exactly what I want is here:
Direction example
When I download it and run in my browser (any browser) for getting deal with it, map is rendered only a moment and then goes away! I don't know why?!
And second Question: Is there any such example that you know?
Thanks a lot in advance

Answer 1

To draw route on map click on map two times so route created on two that points
var map;
var infowindow = new google.maps.InfoWindow();
var wayA;
var wayB;
var geocoder = new google.maps.Geocoder();
var directionsDisplay = new google.maps.DirectionsRenderer({
suppressMarkers: true,
panel: document.getElementById('right-panel'),
draggable: true
});
var directionsService = new google.maps.DirectionsService();
var data = {};
initMap();
function initMap() {
debugger;
map = new google.maps.Map(document.getElementById('rmap'), {
center: new google.maps.LatLng(23.030357, 72.517845),
zoom: 15
});
google.maps.event.addListener(map, "click", function (event) {
if (!wayA) {
wayA = new google.maps.Marker({
position: event.latLng,
map: map,
icon: "https://chart.googleapis.com/chart?chst=d_map_pin_letter&chld=S|00FF00|000000"
});
// calculateAndDisplayRoute(directionsService, directionsDisplay, wayA, wayB);
} else {
if (!wayB) {
debugger;
wayB = new google.maps.Marker({
position: event.latLng,
map: map,
icon: "https://chart.googleapis.com/chart?chst=d_map_pin_letter&chld=E|FF0000|000000"
});
calculateAndDisplayRoute(directionsService, directionsDisplay, wayA, wayB);
}
}
});
}
function computeTotalDistance(result) {
var total = 0;
var myroute = result.routes[0];
for (var i = 0; i < myroute.legs.length; i++) {
total += myroute.legs[i].distance.value;
}
total = total / 1000;
return total;
}
function computeTotalDuration(result) {
var total = 0;
var myroute = result.routes[0].legs[0].duration.text;
return myroute;
}
function calculateAndDisplayRoute(directionsService, directionsDisplay, wayA, wayB) {
debugger;
directionsDisplay.setMap(map);
// directionsDisplay.setPanel(document.getElementById('dvPanel'));
google.maps.event.addListener(directionsDisplay, 'directions_changed', function () {
debugger;
calculateAndDisplayRoute(directionsService, directionsDisplay.getDirections(), wayA, wayB);
});
directionsService.route({
origin: wayA.getPosition(),
destination: wayB.getPosition(),
optimizeWaypoints: true,
travelMode: 'DRIVING'
}, function (response, status) {
if (status === 'OK') {
debugger;
var route = response.routes[0];
wayA.setMap(null);
wayB.setMap(null);
pinA = new google.maps.Marker({
position: route.legs[0].start_location,
map: map,
icon: "https://chart.googleapis.com/chart?chst=d_map_pin_letter&chld=S|00FF00|000000"
}),
pinB = new google.maps.Marker({
position: route.legs[0].end_location,
map: map,
icon: "https://chart.googleapis.com/chart?chst=d_map_pin_letter&chld=E|FF0000|000000"
});
google.maps.event.addListener(pinA, 'click', function () {
infowindow.setContent("<b>Route Start Address = </b>" + route.legs[0].start_address + " <br/>" + route.legs[0].start_location);
infowindow.open(map, this);
});
google.maps.event.addListener(pinB, 'click', function () {
debugger;
infowindow.setContent("<b>Route End Address = </b>" + route.legs[0].end_address + " <br/><b>Distance=</b> " + computeTotalDistance(directionsDisplay.getDirections()) + " Km <br/><b>Travel time=</b> " + computeTotalDuration(directionsDisplay.getDirections()) + " <br/> " + route.legs[0].end_location);
infowindow.open(map, this);
});
} else {
window.alert('Directions request failed due to ' + status);
}
directionsDisplay.setDirections(response);
});
}