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feat: Adds alternative routes sample (#750)
* feat: Adds new samples to support Routes GA launch. Change-Id: I7cc50235247b8f7787577d3a584107068866ebe5 * Clean up initMap by removing unused code Removed commented-out code for importing Map library. * Remove unused library variable definition. Co-authored-by: noelle-jung <[email protected]> * Update samples/routes-get-alternatives/style.css Co-authored-by: noelle-jung <[email protected]> * Update samples/routes-get-alternatives/index.ts Co-authored-by: noelle-jung <[email protected]> * Update samples/routes-get-alternatives/index.ts Co-authored-by: noelle-jung <[email protected]> --------- Co-authored-by: noelle-jung <[email protected]>
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‎samples/routes-get-alternatives/README.md‎

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# Google Maps JavaScript Sample
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This sample is generated from @googlemaps/js-samples located at
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https://github.com/googlemaps-samples/js-api-samples.
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## Setup
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### Before starting run:
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`$npm i`
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### Run an example on a local web server
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First `cd` to the folder for the sample to run, then:
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`$npm start`
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### Build an individual example
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From `samples/`:
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`$npm run build --workspace=sample-name/`
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### Build all of the examples.
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From `samples/`:
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`$npm run build-all`
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## Feedback
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For feedback related to this sample, please open a new issue on
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[GitHub](https://github.com/googlemaps-samples/js-api-samples/issues).
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‎samples/routes-get-alternatives/index.html‎

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<!doctype html>
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<!--
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@license
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Copyright 2025 Google LLC. All Rights Reserved.
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SPDX-License-Identifier: Apache-2.0
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-->
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<!--[START maps_routes_get_alternatives]-->
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<html>
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<head>
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<title>Get directions</title>
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<link rel="stylesheet" type="text/css" href="./style.css" />
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<script type="module" src="./index.js"></script>
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</head>
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<body>
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<gmp-map center="37.447646, -122.113878" zoom="10"></gmp-map>
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<!-- prettier-ignore -->
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<script>(g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})
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({key: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8", v: "beta"});</script>
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</body>
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</html>
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<!--[END maps_routes_get_alternatives]-->

‎samples/routes-get-alternatives/index.ts‎

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"use strict";
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/*
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* @license
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* Copyright 2025 Google LLC. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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// [START maps_routes_get_alternatives]
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// Initialize and add the map.
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let mapPolylines: google.maps.Polyline[] = [];
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const mapElement = document.querySelector('gmp-map') as google.maps.MapElement;
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let innerMap;
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// Initialize and add the map.
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async function initMap() {
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// Request the needed libraries.
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await google.maps.importLibrary('maps') as google.maps.MapsLibrary;
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innerMap = mapElement.innerMap;
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innerMap.setOptions({
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mapTypeControl: false,
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mapId: 'DEMO_MAP_ID',
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});
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// Call the function after the map is loaded.
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google.maps.event.addListenerOnce(innerMap, 'idle', () => {
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getDirections();
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});
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}
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async function getDirections() {
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//@ts-ignore
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// Request the needed libraries.
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const [{ Route, RouteLabel }] = await Promise.all([
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google.maps.importLibrary('routes')
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]);
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// [START maps_routes_get_alternatives_request_full]
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// [START maps_routes_get_alternatives_request]
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// Build a request.
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const request = {
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origin: 'San Francisco, CA',
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destination: 'Sunset Dr Pacific Grove, CA 93950',
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travelMode: 'DRIVING',
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computeAlternativeRoutes: true,
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fields: ['path', 'routeLabels', 'viewport'], // Request the routeLabels field.
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};
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// [END maps_routes_get_alternatives_request]
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// [START maps_routes_get_alternatives_compute]
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// Call computeRoutes to get the directions.
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const result = await Route.computeRoutes(request);
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if (!result.routes || result.routes.length === 0) {
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console.warn("No routes found");
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return;
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}
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let primaryRoute;
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for (const route of result.routes) {
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// Save the primary route for last so it's drawn on top.
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if (
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// Check for the default route.
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route.routeLabels?.includes(RouteLabel.DEFAULT_ROUTE)
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) {
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primaryRoute = route;
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} else {
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drawRoute(route, false);
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}
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}
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if (primaryRoute) {
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drawRoute(primaryRoute, true);
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await primaryRoute.createWaypointAdvancedMarkers({ map: innerMap });
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innerMap.fitBounds(primaryRoute.viewport, 100);
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}
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// [END maps_routes_get_alternatives_compute]
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// [END maps_routes_get_alternatives_request_full]
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// Display the raw JSON for the result in the console.
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console.log(`Response:\n ${JSON.stringify(result, null, 2)}`);
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}
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function drawRoute(route, isPrimaryRoute) {
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mapPolylines = mapPolylines.concat(
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route.createPolylines({
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polylineOptions: isPrimaryRoute
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? { map: innerMap }
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: {
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map: innerMap,
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strokeColor: "#669DF6",
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strokeOpacity: 0.5,
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strokeWidth: 8,
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},
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colorScheme: innerMap.get("colorScheme"),
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}),
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);
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}
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initMap();
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// [END maps_routes_get_alternatives]

‎samples/routes-get-alternatives/package.json‎

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{
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"name": "@js-api-samples/routes-get-alternatives",
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"version": "1.0.0",
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"scripts": {
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"build": "tsc && bash ../jsfiddle.sh routes-get-alternatives && bash ../app.sh routes-get-alternatives && bash ../docs.sh routes-get-alternatives && npm run build:vite --workspace=. && bash ../dist.sh routes-get-alternatives",
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"test": "tsc && npm run build:vite --workspace=.",
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"start": "tsc && vite build --base './' && vite",
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"build:vite": "vite build --base './'",
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"preview": "vite preview"
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},
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"dependencies": {
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}
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}

‎samples/routes-get-alternatives/style.css‎

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/*
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* @license
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* Copyright 2025 Google LLC. All Rights Reserved.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/* [START maps_routes_get_alternatives] */
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/*
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* Always set the map height explicitly to define the size of the div element
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* that contains the map.
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*/
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#map {
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height: 100%;
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}
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/*
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* Optional: Makes the sample page fill the window.
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*/
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html,
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body {
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height: 100%;
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margin: 0;
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padding: 0;
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}
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/* [END maps_routes_get_alternatives] */

‎samples/routes-get-alternatives/tsconfig.json‎

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{
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"compilerOptions": {
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"module": "esnext",
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"target": "esnext",
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"strict": true,
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"noImplicitAny": false,
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"lib": [
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"es2015",
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"esnext",
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"es6",
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"dom",
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"dom.iterable"
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],
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"moduleResolution": "Node",
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"jsx": "preserve"
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}
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}

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