Transit Layer

  • This example demonstrates how to display the public transit network of London using the Google Maps JavaScript API.

  • It uses the TransitLayer class to overlay transit data onto a basic map centered on London.

  • The code provides implementations in both TypeScript and JavaScript, with the JavaScript version being compiled from TypeScript.

  • The sample includes HTML, CSS, and JavaScript/TypeScript code to create a fully functional web page displaying the map.

  • Users can interact with the sample via provided links to JSFiddle, Google Cloud Shell, or by cloning and running the code locally.

This example creates a map that displays the public transit network of London, UK.

Read the documentation.

TypeScript

async function init(): Promise<void> {
    const { TransitLayer } = await google.maps.importLibrary('maps');

    const mapElement =
        document.querySelector<google.maps.MapElement>('gmp-map')!;
    const innerMap = mapElement.innerMap;

    const transitLayer = new TransitLayer();

    transitLayer.setMap(innerMap);
}

void init();

JavaScript

async function init() {
    const { TransitLayer } = await google.maps.importLibrary('maps');

    const mapElement = document.querySelector('gmp-map');
    const innerMap = mapElement.innerMap;

    const transitLayer = new TransitLayer();

    transitLayer.setMap(innerMap);
}

void init();

CSS

/* 
 * Optional: Makes the sample page fill the window. 
 */
html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
}

gmp-map {
    height: 100%;
}

HTML

<html>
    <head>
        <title>Transit Layer</title>

        <link rel="stylesheet" type="text/css" href="./style.css" />
        <script type="module" src="./index.js"></script>
        <script>
            // prettier-ignore
            (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))})({
                key: "GOOGLE_MAPS_API_KEY"
            });
        </script>
    </head>
    <body>
        <gmp-map
            center="51.501904,-0.115871"
            zoom="13"
            map-id="DEMO_MAP_ID"></gmp-map>
    </body>
</html>

Clone Sample

Git and Node.js are required to run this sample locally. Follow these instructions to install Node.js and NPM. The following commands clone, install dependencies and start the sample application. 

  git clone https://github.com/googlemaps-samples/js-api-samples.git
  cd samples/layer-transit
  npm i
  npm start