3d-map-light-dark-toggle

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>3d-map-light-dark-toggle</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>
    <button id="toggle-button" class="toggle-button" type="button">
      Switch to dark mode
    </button>
  </body>
</html>

CSS

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

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: 'Roboto', 'Helvetica', 'Arial', sans-serif;
}

gmp-map-3d {
  height: 100%;
  width: 100%;
}

.toggle-button {
  background: rgb(235, 235, 235);
  color: black;
  border: none;
  padding: 10px 20px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 16px;
  border-radius: 4px;
  cursor: pointer;
  /* Top center avoids the default UI controls and Google attribution. */
  position: fixed;
  top: 10px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1000;
}

.toggle-button:hover {
  background-color: #007bff;
  color: white;
}

JavaScript

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

async function init() {
  const { Map3DElement } = await google.maps.importLibrary('maps3d');

  // By default, the map follows the system's light or dark mode setting.
  const map = new Map3DElement({
    center: {
      lat: 40.758,
      lng: -73.9855,
      altitude: 0,
    },
    range: 2000,
    tilt: 60,
    heading: 30,
    mode: 'ROADMAP',
  });

  document.body.append(map);

  const toggleButton = document.getElementById('toggle-button');

  // Start from the system setting so that the button matches the map.
  let isDarkMode = window.matchMedia('(prefers-color-scheme: dark)').matches;
  updateButtonText();

  toggleButton.addEventListener('click', () => {
    isDarkMode = !isDarkMode;
    // Override the system setting by switching to light or dark mode.
    map.colorScheme = isDarkMode ? 'DARK' : 'LIGHT';
    updateButtonText();
  });

  function updateButtonText() {
    toggleButton.textContent = isDarkMode
      ? 'Switch to light mode'
      : 'Switch to dark mode';
  }
}

void init();