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Revision as of 11:10, 17 April 2012 by jasfox (Talk | contribs)

HERE Maps API - How to calculate a route between two points

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This article explains how to geo-code two locations and show the route between them using Nokia Maps (providing that a valid route can be found).

Article Metadata
Tested with
Devices(s): Internet Explorer, Google chrome, Firefox, Opera
Compatibility
Platform(s): Web browser
Dependencies: Nokia Maps 2.2.0
Article
Created: Maveric (21 Jun 2011)
Updated: avnee.nathani (31 Dec 2011)
Last edited: jasfox (17 Apr 2012)


Contents

Prerequisites

Nokia Maps API supported web browser (basically any modern web browser)

Important about Maps credentials

Nokia provides several services options within the Maps API offering. The service is free to use, but you must obtain and use authentication and authorization credentials to use the services. Please read the Location API Business Models and Usage Restrictions page to decide which business model best fits your needs. Authentication requires unique Maps API credentials, namely an AppId and a token. You can get these credentials free from the Nokia Developer API Registration page.

Implementation

In this example we will define two waypoints for the route; the geographical location of Berlin, Germany to the one of Paris, France. To be able to use the routing we need to initialize a new nokia.maps.routing.Manager. We will cast the waypoints to it with some additional parameters. We want the shortest route with car and no fee roads with avoidTollroad plus having the trafficMode set to default.

Example code

This example has all the required HTML and JavaScript code to perform the routing between Berlin, Germany and Paris, France.

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>A to B Routing Example</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<script type="text/javascript"
src="http://api.maps.nokia.com/2.2.0/jsl.js?with=all" charset="utf-8">
</script>
</head>
<body>
 
<div id="map" style="z-index: -1; left:0px; top:0px; width: 100%; height: 80%; position: absolute;"></div>
<script type="text/javascript">
/////////////////////////////////////////////////////////////////////////////////////
// Don't forget to set your API credentials
//
// Replace with your appId and token which you can obtain when you
// register on http://api.developer.nokia.com/
//
nokia.Settings.set( "appId", "YOUR APP ID GOES HERE");
nokia.Settings.set( "authenticationToken", "YOUR AUTHENTICATION TOKEN GOES HERE");
 
//
/////////////////////////////////////////////////////////////////////////////////////
var map; // Instance of Nokia Maps Display
var router; // New Route search
var geoloc; // New Geocoding search
 
//Define waypoints for the Routing
var waypoints = new nokia.maps.routing.WaypointParameterList();
 
waypoints.addCoordinate( new nokia.maps.geo.Coordinate(52.500556, 13.398889)); // Berlin, Germany
waypoints.addCoordinate( new nokia.maps.geo.Coordinate(48.856667, 2.350833)); // Paris, France
 
//Define Routing parameters
 
var modes = [{
type: "shortest",
transportModes: ["car"],
options: "avoidTollroad",
trafficMode: "default"
}];
 
 
map = new nokia.maps.map.Display(document.getElementById("map"),
{
 
components: [ new nokia.maps.map.component.Behavior(),
new nokia.maps.map.component.ZoomBar(),
new nokia.maps.map.component.Overview(),
new nokia.maps.map.component.TypeSelector(),
new nokia.maps.map.component.ScaleBar()],
'zoomLevel': 3,
});
 
 
router = new nokia.maps.routing.Manager(); //create a route manager
// map.addListener("dblclick", eventListener);
 
//onRouteCalculated will be called when a route was calculated
var onRouteCalculated = function(observedRouter, key, value){
if (value == "finished") {
var routes = observedRouter.getRoutes();
 
//create the default map representation of a route
var mapRoute = new nokia.maps.routing.component.RouteResultSet(routes[0]).container; //first option found
map.objects.add(mapRoute);
 
//Zoom to the bounding box of the route
map.zoomTo(mapRoute.getBoundingBox(), false, "default");
} else if(value == "failed") {
alert("The routing request failed.");
}
};
 
//add the observer function to the router's "state" property
router.addObserver("state", onRouteCalculated);
 
//calculate the route (and call onRouteCalculated afterwards)
router.calculateRoute(waypoints, modes);
</script>
</body>
</html>

Screenshot

NokiaMapsRoute.png

For more on Nokia Maps API

For turn-by-turn routing, check out the advanced routing example here

Please check out the Nokia Maps API full documentation and API reference here:

You may also access the interactive Nokia Maps API playground,

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