This example demonstrates the use of the DirectionsService
object to fetch directions between landmarks in New York City. Markers are
placed at each waypoint along the route. Click on a marker to display the
directions associated with that waypoint.
Read the documentation.
function initMap() { var markerArray = []; // Instantiate a directions service. var directionsService = new google.maps.DirectionsService; // Create a map and center it on Manhattan. var map = new google.maps.Map(document.getElementById('map'), { zoom: 13, center: {lat: 40.771, lng: -73.974} }); // Create a renderer for directions and bind it to the map. var directionsRenderer = new google.maps.DirectionsRenderer({map: map}); // Instantiate an info window to hold step text. var stepDisplay = new google.maps.InfoWindow; // Display the route between the initial start and end selections. calculateAndDisplayRoute( directionsRenderer, directionsService, markerArray, stepDisplay, map); // Listen to change events from the start and end lists. var onChangeHandler = function() { calculateAndDisplayRoute( directionsRenderer, directionsService, markerArray, stepDisplay, map); }; document.getElementById('start').addEventListener('change', onChangeHandler); document.getElementById('end').addEventListener('change', onChangeHandler); } function calculateAndDisplayRoute(directionsRenderer, directionsService, markerArray, stepDisplay, map) { // First, remove any existing markers from the map. for (var i = 0; i < markerArray.length; i++) { markerArray[i].setMap(null); } // Retrieve the start and end locations and create a DirectionsRequest using // WALKING directions. directionsService.route({ origin: document.getElementById('start').value, destination: document.getElementById('end').value, travelMode: 'WALKING' }, function(response, status) { // Route the directions and pass the response to a function to create // markers for each step. if (status === 'OK') { document.getElementById('warnings-panel').innerHTML = '<b>' + response.routes[0].warnings + '</b>'; directionsRenderer.setDirections(response); showSteps(response, markerArray, stepDisplay, map); } else { window.alert('Directions request failed due to ' + status); } }); } function showSteps(directionResult, markerArray, stepDisplay, map) { // For each step, place a marker, and add the text to the marker's infowindow. // Also attach the marker to an array so we can keep track of it and remove it // when calculating new routes. var myRoute = directionResult.routes[0].legs[0]; for (var i = 0; i < myRoute.steps.length; i++) { var marker = markerArray[i] = markerArray[i] || new google.maps.Marker; marker.setMap(map); marker.setPosition(myRoute.steps[i].start_location); attachInstructionText( stepDisplay, marker, myRoute.steps[i].instructions, map); } } function attachInstructionText(stepDisplay, marker, text, map) { google.maps.event.addListener(marker, 'click', function() { // Open an info window when the marker is clicked on, containing the text // of the step. stepDisplay.setContent(text); stepDisplay.open(map, marker); }); }
<div id="floating-panel"> <b>Start: </b> <select id="start"> <option value="penn station, new york, ny">Penn Station</option> <option value="grand central station, new york, ny">Grand Central Station</option> <option value="625 8th Avenue, New York, NY, 10018">Port Authority Bus Terminal</option> <option value="staten island ferry terminal, new york, ny">Staten Island Ferry Terminal</option> <option value="101 E 125th Street, New York, NY">Harlem - 125th St Station</option> </select> <b>End: </b> <select id="end"> <option value="260 Broadway New York NY 10007">City Hall</option> <option value="W 49th St & 5th Ave, New York, NY 10020">Rockefeller Center</option> <option value="moma, New York, NY">MOMA</option> <option value="350 5th Ave, New York, NY, 10118">Empire State Building</option> <option value="253 West 125th Street, New York, NY">Apollo Theater</option> <option value="1 Wall St, New York, NY">Wall St</option> </select> </div> <div id="map"></div> <div id="warnings-panel"></div>
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; }
#floating-panel { position: absolute; top: 10px; left: 25%; z-index: 5; background-color: #fff; padding: 5px; border: 1px solid #999; text-align: center; font-family: 'Roboto','sans-serif'; line-height: 30px; padding-left: 10px; }
#warnings-panel { width: 100%; height:10%; text-align: center; }
<!-- Replace the value of the key parameter with your own API key. --> <script async defer src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap"> </script>
Try it yourself
You can experiment with this code in JSFiddle by clicking the <>
icon in the
top-right corner of the code window.
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Directions Service (Complex)</title>
<style>
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#floating-panel {
position: absolute;
top: 10px;
left: 25%;
z-index: 5;
background-color: #fff;
padding: 5px;
border: 1px solid #999;
text-align: center;
font-family: 'Roboto','sans-serif';
line-height: 30px;
padding-left: 10px;
}
#warnings-panel {
width: 100%;
height:10%;
text-align: center;
}
</style>
</head>
<body>
<div id="floating-panel">
<b>Start: </b>
<select id="start">
<option value="penn station, new york, ny">Penn Station</option>
<option value="grand central station, new york, ny">Grand Central Station</option>
<option value="625 8th Avenue, New York, NY, 10018">Port Authority Bus Terminal</option>
<option value="staten island ferry terminal, new york, ny">Staten Island Ferry Terminal</option>
<option value="101 E 125th Street, New York, NY">Harlem - 125th St Station</option>
</select>
<b>End: </b>
<select id="end">
<option value="260 Broadway New York NY 10007">City Hall</option>
<option value="W 49th St & 5th Ave, New York, NY 10020">Rockefeller Center</option>
<option value="moma, New York, NY">MOMA</option>
<option value="350 5th Ave, New York, NY, 10118">Empire State Building</option>
<option value="253 West 125th Street, New York, NY">Apollo Theater</option>
<option value="1 Wall St, New York, NY">Wall St</option>
</select>
</div>
<div id="map"></div>
<div id="warnings-panel"></div>
<script>
function initMap() {
var markerArray = [];
// Instantiate a directions service.
var directionsService = new google.maps.DirectionsService;
// Create a map and center it on Manhattan.
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 13,
center: {lat: 40.771, lng: -73.974}
});
// Create a renderer for directions and bind it to the map.
var directionsRenderer = new google.maps.DirectionsRenderer({map: map});
// Instantiate an info window to hold step text.
var stepDisplay = new google.maps.InfoWindow;
// Display the route between the initial start and end selections.
calculateAndDisplayRoute(
directionsRenderer, directionsService, markerArray, stepDisplay, map);
// Listen to change events from the start and end lists.
var onChangeHandler = function() {
calculateAndDisplayRoute(
directionsRenderer, directionsService, markerArray, stepDisplay, map);
};
document.getElementById('start').addEventListener('change', onChangeHandler);
document.getElementById('end').addEventListener('change', onChangeHandler);
}
function calculateAndDisplayRoute(directionsRenderer, directionsService,
markerArray, stepDisplay, map) {
// First, remove any existing markers from the map.
for (var i = 0; i < markerArray.length; i++) {
markerArray[i].setMap(null);
}
// Retrieve the start and end locations and create a DirectionsRequest using
// WALKING directions.
directionsService.route({
origin: document.getElementById('start').value,
destination: document.getElementById('end').value,
travelMode: 'WALKING'
}, function(response, status) {
// Route the directions and pass the response to a function to create
// markers for each step.
if (status === 'OK') {
document.getElementById('warnings-panel').innerHTML =
'<b>' + response.routes[0].warnings + '</b>';
directionsRenderer.setDirections(response);
showSteps(response, markerArray, stepDisplay, map);
} else {
window.alert('Directions request failed due to ' + status);
}
});
}
function showSteps(directionResult, markerArray, stepDisplay, map) {
// For each step, place a marker, and add the text to the marker's infowindow.
// Also attach the marker to an array so we can keep track of it and remove it
// when calculating new routes.
var myRoute = directionResult.routes[0].legs[0];
for (var i = 0; i < myRoute.steps.length; i++) {
var marker = markerArray[i] = markerArray[i] || new google.maps.Marker;
marker.setMap(map);
marker.setPosition(myRoute.steps[i].start_location);
attachInstructionText(
stepDisplay, marker, myRoute.steps[i].instructions, map);
}
}
function attachInstructionText(stepDisplay, marker, text, map) {
google.maps.event.addListener(marker, 'click', function() {
// Open an info window when the marker is clicked on, containing the text
// of the step.
stepDisplay.setContent(text);
stepDisplay.open(map, marker);
});
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
</script>
</body>
</html>