elevation-simple

Sample code supporting Google Maps Platform JavaScript API documentation. author(s): Geo Developer IX Documentation Team

HTML

<!doctype html>
<!--
 @license
 Copyright 2026 Google LLC. All Rights Reserved.
 SPDX-License-Identifier: Apache-2.0
-->

<html>
  <head>
    <title>Elevation Service</title>

    <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))})({
            });
    </script>
  </head>
  <body>
    <gmp-map
      center="63.333,-150.5"
      zoom="8"
      map-id="DEMO_MAP_ID"
      map-type-id="terrain"></gmp-map>
  </body>
</html>

CSS

/**
 * @license
 * Copyright 2026 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

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

gmp-map {
  height: 100%;
}

JavaScript

'use strict';
/**
 * @license
 * Copyright 2026 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

async function init() {
  const [{ InfoWindow }, { ElevationService }] = await Promise.all([
    google.maps.importLibrary('maps'),
    google.maps.importLibrary('elevation'),
  ]);

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

  const elevator = new ElevationService();
  const infowindow = new InfoWindow();

  infowindow.open(innerMap);

  // Add a listener for the click event. Display the elevation for the LatLng of
  // the click inside the infowindow.
  innerMap.addListener('click', (event) => {
    displayLocationElevation(event.latLng, elevator, infowindow, innerMap);
  });
}

function displayLocationElevation(location, elevator, infowindow, map) {
  // Format numeric values to two decimal places
  const formatter = new Intl.NumberFormat(undefined, {
    maximumFractionDigits: 2,
  });

  // Initiate the location request
  elevator
    .getElevationForLocations({
      locations: [location],
    })
    .then(({ results }) => {
      if (results[0]) {
        const { elevation, location: resultLocation } = results[0];
        infowindow.setPosition(resultLocation);
        infowindow.setContent(
          `The elevation at ${String(resultLocation)} <br>is ${formatter.format(elevation)} meters.`
        );
      } else {
        infowindow.setPosition(location);
        infowindow.setContent('No results found');
      }

      infowindow.open(map);
    })
    .catch((e) => {
      infowindow.setContent(`Elevation service failed due to: ${String(e)}`);
    });
}

void init();