Learn how to find a route and directions with the route service .
Routing is the process of finding the path from an origin to a destination in a street network. You can use the route service to find routes , get driving directions, calculate drive times, and solve complicated, multiple vehicle routing problems. To create a route, you typically define a set of stops (origin and one or more destinations) and use the service to find a route with directions. You can also use a number of additional parameters such as barriers and mode of travel to refine the results.
In this tutorial, you use ArcGIS REST JS to access the routing service to get route. You click on the map to get an origin and destination that are used to get a route and directions from the route service. The directions are also displayed on the map.
Prerequisites You need an ArcGIS Developer or ArcGIS Online account to access the developer dashboard and create an API key .
Steps Create a new pen To get started, either complete the Display a map tutorial or use this pen . Set the API key To access location services , you need an API key or OAuth 2.0 access token . To learn how to create and scope your key, visit the Create an API key tutorial.
Go to your dashboard to get an API key. The API key must be scoped to access the services used in this tutorial.
In CodePen , update api Key
to use your key.
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const apiKey = "YOUR_API_KEY" ;
const basemapEnum = "ArcGIS:Streets" ;
const map = new maplibregl.Map({
container : "map" , // the id of the div element
style : `https://basemaps-api.arcgis.com/arcgis/rest/services/styles/ ${basemapEnum} ?type=style&token= ${apiKey} ` ,
zoom : 12 , // starting zoom
center : [- 118.805 , 34.027 ] // starting location [longitude, latitude]
});
Add references to ArcGIS REST JS In the <head>
element, add references to the ArcGIS REST JS library. Expand
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< head >
< meta charset = "utf-8" />
< meta name = "viewport" content = "initial-scale=1,maximum-scale=1,user-scalable=no" />
< script src = https://unpkg.com/maplibre-gl@2.4.0/dist/maplibre-gl.js > </ script >
< link href = https://unpkg.com/maplibre-gl@2.4.0/dist/maplibre-gl.css rel = "stylesheet" />
< script src = "https://unpkg.com/@esri/arcgis-rest-request@4.0.0/dist/bundled/request.umd.js" > </ script >
< script src = "https://unpkg.com/@esri/arcgis-rest-routing@4.0.0/dist/bundled/routing.umd.js" > </ script >
< style >
html ,
body ,
#map {
padding : 0 ;
margin : 0 ;
height : 100% ;
width : 100% ;
font-family : Arial, Helvetica, sans-serif;
font-size : 14px ;
color : #323232 ;
}
</ style >
</ head >
Update the map A navigation basemap layer is typically used in geocoding and routing applications. Update the basemap layer to use ArcGIS: Navigation
.
Update the basemap and the map initialization to center on location [-79.3832,43.6532]
, Toronto.
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const apiKey = "YOUR_API_KEY" ;
const basemapEnum = "ArcGIS:Navigation" ;
const map = new maplibregl.Map({
container : "map" , // the id of the div element
style : `https://basemaps-api.arcgis.com/arcgis/rest/services/styles/ ${basemapEnum} ?type=style&token= ${apiKey} ` ,
zoom : 12 , // starting zoom
center : [- 79.3832 , 43.6532 ] // Toronto
});
Add end point layers To display circles for the start and end of the route, you will two circle layers . Each layer needs a GeoJSON source which holds the data.
Create a function called add Circle Layers
.
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const map = new maplibregl.Map({
container : "map" , // the id of the div element
style : `https://basemaps-api.arcgis.com/arcgis/rest/services/styles/ ${basemapEnum} ?type=style&token= ${apiKey} ` ,
zoom : 12 , // starting zoom
center : [- 79.3832 , 43.6532 ] // Toronto
});
function addCircleLayers ( ) {
}
Add a GeoJSON source for the start and end, with ids route-start
and route-end
. Set the data
attribute of each source to be an empty FeatureCollection.
More info This source will later contain the geometry information of the start or end point that the user has selected. For now, you can simply provide it with an empty piece of GeoJSON: a feature collection that contains no features.
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function addCircleLayers ( ) {
map.addSource( "start" , {
type : "geojson" ,
data : {
type : "FeatureCollection" ,
features : []
}
});
map.addSource( "end" , {
type : "geojson" ,
data : {
type : "FeatureCollection" ,
features : []
}
});
}
Add a layer of type circle
for the start and end, connected to those sources. Use the circle-color
paint property to make the start circle white and the end circle black.
More info Each layer will display the data in its source. Since there is no data in those sources for now, nothing will display yet.
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function addCircleLayers ( ) {
map.addSource( "start" , {
type : "geojson" ,
data : {
type : "FeatureCollection" ,
features : []
}
});
map.addSource( "end" , {
type : "geojson" ,
data : {
type : "FeatureCollection" ,
features : []
}
});
map.addLayer({
id : "start-circle" ,
type : "circle" ,
source : "start" ,
paint : {
"circle-radius" : 6 ,
"circle-color" : "white" ,
"circle-stroke-color" : "black" ,
"circle-stroke-width" : 2
}
});
map.addLayer({
id : "end-circle" ,
type : "circle" ,
source : "end" ,
paint : {
"circle-radius" : 7 ,
"circle-color" : "black"
}
});
}
Add a load event handler At this stage, the layers have not been added to the map. It is important to wait for the map to finish loading before adding the layers.
Add an event handler to the map load
event. Call the add Circle Layers
function.
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map.addLayer({
id : "end-circle" ,
type : "circle" ,
source : "end" ,
paint : {
"circle-radius" : 7 ,
"circle-color" : "black"
}
});
}
map.on( "load" , () => {
addCircleLayers();
addRouteLayer();
});
Add a click handler You will click twice to set a start and end for the route. The first click will update the start
source . The second click will update the end
source. To set the GeoJSON data you use map.get Source
to get the Source
, then call set Data
.
You use a click
event handler to respond to these clicks.
More info The object passed to the click
event contains several useful properties, including:
lng Lat
: the map location where the click took place.point
: the screen location in pixels where the click took place.original Event
: the DOM event, which contains information about modifier keys.For more information, see the MapLibre GL JS documentation .
Add a variable to store whether the next click will be for the start or end of the route. Set it initially to start
. Add a variable to store the coordinates for each end.
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map.on( "load" , () => {
addCircleLayers();
addRouteLayer();
});
let currentStep = "start" ;
let startCoords, endCoords;
Add a click
event handler to the map. Use the lng Lat
property of the event parameter to create a GeoJSON Point
object.
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let currentStep = "start" ;
let startCoords, endCoords;
map.on( "click" , ( e ) => {
const coordinates = e.lngLat.toArray();
const point = {
type : "Point" ,
coordinates
};
});
Use map.get Source
and the set Data
method to update the correct source with the GeoJSON object.
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map.on( "click" , ( e ) => {
const coordinates = e.lngLat.toArray();
const point = {
type : "Point" ,
coordinates
};
if (currentStep === "start" ) {
map.getSource( "start" ).setData(point);
startCoords = coordinates;
const empty = {
type : "FeatureCollection" ,
features : []
};
map.getSource( "end" ).setData(empty);
map.getSource( "route" ).setData(empty);
endCoords = null ;
currentStep = "end" ;
} else {
map.getSource( "end" ).setData(point);
endCoords = coordinates;
currentStep = "start" ;
}
});
At the top right, click Run . You should be able to click in two places to set a white circle for the start, and a black circle for the end.
Add route layer The route object that will be retrieved is a GeoJSON Line String
object. To display it, you define a GeoJSON source and a line layer .
Create a add Route Layer
function. Inside, add a source of type geojson
with id route
. Set its data
attribute to be an empty Feature Collection
.
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map.addLayer({
id : "end-circle" ,
type : "circle" ,
source : "end" ,
paint : {
"circle-radius" : 7 ,
"circle-color" : "black"
}
});
}
function addRouteLayer ( ) {
map.addSource( "route" , {
type : "geojson" ,
data : {
type : "FeatureCollection" ,
features : []
}
});
}
Add a layer of type line
with id route-line
. Set its source to be route
, and give it width, color and opacity attributes.
More info This source will later contain the geometry information of the route between points that the user has selected. For now, you can simply provide it with an empty piece of GeoJSON: a feature collection that contains no features.
The layer will display the source. Since there is no data in the source for now, nothing will display yet.
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function addRouteLayer ( ) {
map.addSource( "route" , {
type : "geojson" ,
data : {
type : "FeatureCollection" ,
features : []
}
});
map.addLayer({
id : "route-line" ,
type : "line" ,
source : "route" ,
paint : {
"line-color" : "hsl(205, 100%, 50%)" ,
"line-width" : 4 ,
"line-opacity" : 0.6
}
});
}
Get the route To find the route, you use ArcGIS REST JS to call the solve Route
function to access the route service . Make sure to warn the user if there is a problem accessing the service.
To update the route
source with the result, get the Source with map.get Source
to get the Source, then call set Data
.
Create a function called update Route
. Inside, create a new Api K e y Manager
to access the route service . Call solve Route
with the two sets of coordinates as a stops
array.
In order to access ArcGIS location services with ArcGIS REST JS , you need an access token , either an API key or a token created by OAuth 2.0 authentication. API keys have scopes, so make sure to scope your API key with permissions to access the service.
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paint : {
"line-color" : "hsl(205, 100%, 50%)" ,
"line-width" : 4 ,
"line-opacity" : 0.6
}
});
}
function updateRoute ( ) {
const authentication = arcgisRest.ApiKeyManager.fromKey(apiKey);
arcgisRest
.solveRoute({
stops : [startCoords, endCoords],
endpoint : "https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World/solve" ,
authentication
})
}
Create a response handler. Inside, use the set Data
method to update the route
source's geometry from the response's routes.geojson
property.
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arcgisRest
.solveRoute({
stops : [startCoords, endCoords],
endpoint : "https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World/solve" ,
authentication
})
.then( ( response ) => {
map.getSource( "route" ).setData(response.routes.geoJson);
})
Add an error handler. Show a message and log a message if there is a problem.
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.then( ( response ) => {
map.getSource( "route" ).setData(response.routes.geoJson);
})
.catch( ( error ) => {
console .error(error);
alert( "There was a problem using the route service. See the console for details." );
});
Update the click handler If the start and end coordinates have been set by the user, you can now call your update Route
function.
Check that the start and end coordinates have been set. Then call update Route
.
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map.on( "click" , ( e ) => {
const coordinates = e.lngLat.toArray();
const point = {
type : "Point" ,
coordinates
};
if (currentStep === "start" ) {
map.getSource( "start" ).setData(point);
startCoords = coordinates;
const empty = {
type : "FeatureCollection" ,
features : []
};
map.getSource( "end" ).setData(empty);
map.getSource( "route" ).setData(empty);
endCoords = null ;
currentStep = "end" ;
} else {
map.getSource( "end" ).setData(point);
endCoords = coordinates;
currentStep = "start" ;
}
if (startCoords && endCoords) {
updateRoute(startCoords, endCoords);
}
});
Show directions The data returned from the route service contains directions information. To display it, you can create a styled <div>
element. You will populate this with data drawn from the directions
attribute of the response.
In the <body>
, add a <div>
element with an id of directions
.
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< body >
< div id = "map" > </ div >
< div id = "directions" > Click on the map to create a start and end for the route. </ div >
In the <style>
section, style the #directions
element with absolute
position so it sits in front of the map, and a fixed width and height.
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