advanced-markers-animation

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

HTML

<!doctype html>
<!--
 @license
 Copyright 2025 Google LLC. All Rights Reserved.
 SPDX-License-Identifier: Apache-2.0
-->

<html>
  <head>
    <title>Advanced Markers CSS Animation</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>
    <div id="mapContainer">
      <div id="map" style="height: 100%"></div>
    </div>
  </body>
</html>

CSS

/**
 * @license
 * Copyright 2025 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

/* 
 * 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;
}

/* set the default transition time */
:root {
  --delay-time: 0.5s;
}

#map {
  height: 100%;
}

#mapContainer {
  height: 100%;
}

@keyframes drop {
  0% {
    transform: translateY(-200px) scaleY(0.9);
    opacity: 0;
  }
  5% {
    opacity: 0.7;
  }
  50% {
    transform: translateY(0px) scaleY(1);
    opacity: 1;
  }
  65% {
    transform: translateY(-17px) scaleY(0.9);
    opacity: 1;
  }
  75% {
    transform: translateY(-22px) scaleY(0.9);
    opacity: 1;
  }
  100% {
    transform: translateY(0px) scaleY(1);
    opacity: 1;
  }
}
.drop {
  animation: drop 0.3s linear forwards var(--delay-time);
}

.ui-button {
  background-color: #fff;
  border: 0;
  border-radius: 2px;
  box-shadow: 0 1px 4px -1px rgba(0, 0, 0, 0.3);
  margin: 10px;
  padding: 0 0.5em;
  font:
    400 18px Roboto,
    Arial,
    sans-serif;
  overflow: hidden;
  height: 40px;
  cursor: pointer;
}

.ui-button:hover {
  background: rgb(235, 235, 235);
}

JavaScript

'use strict';
/**
 * @license
 * Copyright 2025 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

/**
 * Returns a random lat lng position within the map bounds.
 */
function getRandomPosition(map) {
  const bounds = map.getBounds();
  const minLat = bounds.getSouthWest().lat();
  const minLng = bounds.getSouthWest().lng();
  const maxLat = bounds.getNorthEast().lat();
  const maxLng = bounds.getNorthEast().lng();

  const latRange = maxLat - minLat;

  // Note: longitude can span from a positive longitude in the west to a
  // negative one in the east. e.g. 150lng (150E) <-> -30lng (30W) is a large
  // span that covers the whole USA.
  let lngRange = maxLng - minLng;
  if (maxLng < minLng) {
    lngRange += 360;
  }

  return {
    lat: minLat + Math.random() * latRange,
    lng: minLng + Math.random() * lngRange,
  };
}

const intersectionObserver = new IntersectionObserver((entries) => {
  for (const entry of entries) {
    if (entry.isIntersecting) {
      entry.target.classList.add('drop');
      intersectionObserver.unobserve(entry.target);
    }
  }
});

async function init() {
  // Request needed libraries.
  const [
    { Map },
    { event, ControlPosition },
    { AdvancedMarkerElement, PinElement },
  ] = await Promise.all([
    google.maps.importLibrary('maps'),
    google.maps.importLibrary('core'),
    google.maps.importLibrary('marker'),
  ]);

  const position = { lat: 37.4242011827985, lng: -122.09242296450893 };

  const map = new Map(document.getElementById('map'), {
    zoom: 14,
    center: position,
    mapId: '4504f8b37365c3d0',
  });

  // Create 100 markers to animate.
  event.addListenerOnce(map, 'idle', () => {
    for (let i = 0; i < 100; i++) {
      createMarker(map, AdvancedMarkerElement, PinElement);
    }
  });

  // Add a button to reset the example.
  const controlDiv = document.createElement('div');
  const controlUI = document.createElement('button');

  controlUI.classList.add('ui-button');
 ...