Data Layer: Simple

  • This example demonstrates loading a GeoJSON file to display geographical data on a Google Map.

  • It uses the map.data.loadGeoJson function to fetch and render the GeoJSON data.

  • The map is centered on Australia and uses a zoom level of 4.

  • Included are code snippets in TypeScript, JavaScript, CSS, and HTML to showcase the implementation.

  • The sample can be run locally with Git and Node.js or tried online through provided links.

This example uses a data layer to set the stroke width and fill color for the samples provided from a GeoJSON file.

Read the documentation.

TypeScript

async function initMap() {
  (await google.maps.importLibrary("maps")) as google.maps.MapsLibrary;

  const mapElement = document.querySelector(
    "gmp-map"
  ) as google.maps.MapElement;

  let innerMap = mapElement.innerMap;

  innerMap.data.loadGeoJson("google.json");
}

initMap();
index.ts

JavaScript

async function initMap() {
    (await google.maps.importLibrary("maps"));
    const mapElement = document.querySelector("gmp-map");
    let innerMap = mapElement.innerMap;
    innerMap.data.loadGeoJson("google.json");
}
initMap();
index.js

CSS

/* 
 * 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;
}

style.css

HTML

<html>
  <head>
    <title>Data Layer: Simple</title>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <!-- Add a comment. -->
    <gmp-map center="-28,137" zoom="4"></gmp-map>

    <!-- prettier-ignore -->
    <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))})
        ({key: "AIzaSyA6myHzS10YXdcazAFalmXvDkrYCp5cLc8", v: "weekly"});</script>
  </body>
</html>
index.html

Try Sample

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-data-simple
  npm i
  npm start