Cómo crear marcadores con HTML y CSS

Con Marcadores avanzados, puedes utilizar HTML y CSS personalizados para crear marcadores con un alto impacto visual que incluyan animaciones y permitan interacciones. Todas las instancias de AdvancedMarkerElement se agregan al DOM como elementos HTML. Puedes acceder a ellos con la propiedad element y puedes controlarlos de la misma manera que cualquier otro elemento del DOM. Dado que AdvancedMarkerElement es un elemento del DOM, puedes aplicar diseños de CSS directamente en el marcador predeterminado, así como crear marcadores personalizados desde cero completamente con HTML y CSS.

Marcador HTML simple

Este mapa de ejemplo muestra cómo se crea un marcador HTML personalizado simple:

Consulta la fuente

En el siguiente ejemplo, se muestran los pasos que se deben seguir para crear un elemento DIV, asignar una clase de CSS y contenido de texto al DIV y, luego, pasar el DIV como el valor de AdvancedMarkerElement.content:

TypeScript

async function initMap() {
  // Request needed libraries.
  const { Map } = await google.maps.importLibrary("maps") as google.maps.MapsLibrary;
  const { AdvancedMarkerElement } = await google.maps.importLibrary("marker") as google.maps.MarkerLibrary;

  const map = new Map(document.getElementById('map') as HTMLElement, {
    center: { lat: 37.42, lng: -122.1 },
    zoom: 14,
    mapId: '4504f8b37365c3d0',
  });

  const priceTag = document.createElement('div');
  priceTag.className = 'price-tag';
  priceTag.textContent = '$2.5M';

  const marker = new AdvancedMarkerElement({
    map,
    position: { lat: 37.42, lng: -122.1 },
    content: priceTag,
  });
}
initMap();
index.ts

JavaScript

async function initMap() {
  // Request needed libraries.
  const { Map } = await google.maps.importLibrary("maps");
  const { AdvancedMarkerElement } = await google.maps.importLibrary("marker");
  const map = new Map(document.getElementById("map"), {
    center: { lat: 37.42, lng: -122.1 },
    zoom: 14,
    mapId: "4504f8b37365c3d0",
  });
  const priceTag = document.createElement("div");

  priceTag.className = "price-tag";
  priceTag.textContent = "$2.5M";

  const marker = new AdvancedMarkerElement({
    map,
    position: { lat: 37.42, lng: -122.1 },
    content: priceTag,
  });
}

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;
}

/* HTML marker styles */
.price-tag {
  background-color: #4285F4;
  border-radius: 8px;
  color: #FFFFFF;
  font-size: 14px;
  padding: 10px 15px;
  position: relative;
}

.price-tag::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 100%;
  transform: translate(-50%, 0);
  width: 0;
  height: 0;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-top: 8px solid #4285F4;
}

style.css

HTML

<html>
  <head>
    <title>Advanced Marker Simple HTML</title>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>

    <!-- 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: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "weekly"});</script>
  </body>
</html>
index.html

Prueba la muestra

Marcadores interactivos

En este ejemplo, te indicamos cómo crear un conjunto de marcadores interactivos que muestren información ficticia cuando se haga clic en ellos. La mayor parte de la funcionalidad de este ejemplo está incluida en el CSS.

Consulta la fuente

TypeScript

async function initMap() {
  // Request needed libraries.
  const { Map } = await google.maps.importLibrary("maps") as google.maps.MapsLibrary;
  const { AdvancedMarkerElement } = await google.maps.importLibrary("marker") as google.maps.MarkerLibrary;

  const center = {lat: 37.43238031167444, lng: -122.16795397128632};
  const map = new Map(document.getElementById("map") as HTMLElement, {
    zoom: 11,
    center,
    mapId: "4504f8b37365c3d0",
  });

  for (const property of properties) {
    const AdvancedMarkerElement = new google.maps.marker.AdvancedMarkerElement({
      map,
      content: buildContent(property),
      position: property.position,
      title: property.description,
    });

    AdvancedMarkerElement.addListener("click", () => {
      toggleHighlight(AdvancedMarkerElement, property);
    });
  }
}

function toggleHighlight(markerView, property) {
  if (markerView.content.classList.contains("highlight")) {
  	markerView.content.classList.remove("highlight");
  	markerView.zIndex = null;
  } else {
  	markerView.content.classList.add("highlight");
  	markerView.zIndex = 1;
  }
}

function buildContent(property) {
  const content = document.createElement("div");
  content.classList.add("property");
  content.innerHTML = `
    <div class="icon">
        <i aria-hidden="true" class="fa fa-icon fa-${property.type}" title="${property.type}"></i>
        <span class="fa-sr-only">${property.type}</span>
    </div>
    <div class="details">
        <div class="price">${property.price}</div>
        <div class="address">${property.address}</div>
        <div class="features">
        <div>
            <i aria-hidden="true" class="fa fa-bed fa-lg bed" title="bedroom"></i>
            <span class="fa-sr-only">bedroom</span>
            <span>${property.bed}</span>
        </div>
        <div>
            <i aria-hidden="true" class="fa fa-bath fa-lg bath" title="bathroom"></i>
            <span class="fa-sr-only">bathroom</span>
            <span>${property.bath}</span>
        </div>
        <div>
            <i aria-hidden="true" class="fa fa-ruler fa-lg size" title="size"></i>
            <span class="fa-sr-only">size</span>
            <span>${property.size} ft<sup>2</sup></span>
        </div>
        </div>
    </div>
    `;
  return content;
}

const properties = [{
  address: '215 Emily St, MountainView, CA',
  description: 'Single family house with modern design',
  price: '$ 3,889,000',
  type: 'home',
  bed: 5,
  bath: 4.5,
  size: 300,
  position: {
    lat: 37.50024109655184,
    lng: -122.28528451834352,
  },
}, {
  address: '108 Squirrel Ln &#128063;, Menlo Park, CA',
  description: 'Townhouse with friendly neighbors',
  price: '$ 3,050,000',
  type: 'building',
  bed: 4,
  bath: 3,
  size: 200,
  position: {
    lat: 37.44440882321596,
    lng: -122.2160620727,
  },
},
{
  address: '100 Chris St, Portola Valley, CA',
  description: 'Spacious warehouse great for small business',
  price: '$ 3,125,000',
  type: 'warehouse',
  bed: 4,
  bath: 4,
  size: 800,
  position: {
    lat: 37.39561833718522,
    lng: -122.21855116258479,
  },
}, {
  address: '98 Aleh Ave, Palo Alto, CA',
  description: 'A lovely store on busy road',
  price: '$ 4,225,000',
  type: 'store-alt',
  bed: 2,
  bath: 1,
  size: 210,
  position: {
    lat: 37.423928529779644,
    lng: -122.1087629822001,
  },
}, {
  address: '2117 Su St, MountainView, CA',
  description: 'Single family house near golf club',
  price: '$ 1,700,000',
  type: 'home',
  bed: 4,
  bath: 3,
  size: 200,
  position: {
    lat: 37.40578635332598,
    lng: -122.15043378466069,
  },
}, {
  address: '197 Alicia Dr, Santa Clara, CA',
  description: 'Multifloor large warehouse',
  price: '$ 5,000,000',
  type: 'warehouse',
  bed: 5,
  bath: 4,
  size: 700,
  position: {
    lat: 37.36399747905774,
    lng: -122.10465384268522,
  },
}, {
  address: '700 Jose Ave, Sunnyvale, CA',
  description: '3 storey townhouse with 2 car garage',
  price: '$ 3,850,000',
  type: 'building',
  bed: 4,
  bath: 4,
  size: 600,
  position: {
    lat: 37.38343706184458,
    lng: -122.02340436985183,
  },
}, {
  address: '868 Will Ct, Cupertino, CA',
  description: 'Single family house in great school zone',
  price: '$ 2,500,000',
  type: 'home',
  bed: 3,
  bath: 2,
  size: 100,
  position: {
    lat: 37.34576403052,
    lng: -122.04455090047453,
  },
}, {
  address: '655 Haylee St, Santa Clara, CA',
  description: '2 storey store with large storage room',
  price: '$ 2,500,000',
  type: 'store-alt',
  bed: 3,
  bath: 2,
  size: 450,
  position: {
    lat: 37.362863347890716,
    lng: -121.97802139023555,
  },
}, {
  address: '2019 Natasha Dr, San Jose, CA',
  description: 'Single family house',
  price: '$ 2,325,000',
  type: 'home',
  bed: 4,
  bath: 3.5,
  size: 500,
  position: {
    lat: 37.41391636421949,
    lng: -121.94592071575907,
  },
}];

initMap();
index.ts

JavaScript

async function initMap() {
  // Request needed libraries.
  const { Map } = await google.maps.importLibrary("maps");
  const { AdvancedMarkerElement } = await google.maps.importLibrary("marker");
  const center = { lat: 37.43238031167444, lng: -122.16795397128632 };
  const map = new Map(document.getElementById("map"), {
    zoom: 11,
    center,
    mapId: "4504f8b37365c3d0",
  });

  for (const property of properties) {
    const AdvancedMarkerElement = new google.maps.marker.AdvancedMarkerElement({
      map,
      content: buildContent(property),
      position: property.position,
      title: property.description,
    });

    AdvancedMarkerElement.addListener("click", () => {
      toggleHighlight(AdvancedMarkerElement, property);
    });
  }
}

function toggleHighlight(markerView, property) {
  if (markerView.content.classList.contains("highlight")) {
    markerView.content.classList.remove("highlight");
    markerView.zIndex = null;
  } else {
    markerView.content.classList.add("highlight");
    markerView.zIndex = 1;
  }
}

function buildContent(property) {
  const content = document.createElement("div");

  content.classList.add("property");
  content.innerHTML = `
    <div class="icon">
        <i aria-hidden="true" class="fa fa-icon fa-${property.type}" title="${property.type}"></i>
        <span class="fa-sr-only">${property.type}</span>
    </div>
    <div class="details">
        <div class="price">${property.price}</div>
        <div class="address">${property.address}</div>
        <div class="features">
        <div>
            <i aria-hidden="true" class="fa fa-bed fa-lg bed" title="bedroom"></i>
            <span class="fa-sr-only">bedroom</span>
            <span>${property.bed}</span>
        </div>
        <div>
            <i aria-hidden="true" class="fa fa-bath fa-lg bath" title="bathroom"></i>
            <span class="fa-sr-only">bathroom</span>
            <span>${property.bath}</span>
        </div>
        <div>
            <i aria-hidden="true" class="fa fa-ruler fa-lg size" title="size"></i>
            <span class="fa-sr-only">size</span>
            <span>${property.size} ft<sup>2</sup></span>
        </div>
        </div>
    </div>
    `;
  return content;
}

const properties = [
  {
    address: "215 Emily St, MountainView, CA",
    description: "Single family house with modern design",
    price: "$ 3,889,000",
    type: "home",
    bed: 5,
    bath: 4.5,
    size: 300,
    position: {
      lat: 37.50024109655184,
      lng: -122.28528451834352,
    },
  },
  {
    address: "108 Squirrel Ln &#128063;, Menlo Park, CA",
    description: "Townhouse with friendly neighbors",
    price: "$ 3,050,000",
    type: "building",
    bed: 4,
    bath: 3,
    size: 200,
    position: {
      lat: 37.44440882321596,
      lng: -122.2160620727,
    },
  },
  {
    address: "100 Chris St, Portola Valley, CA",
    description: "Spacious warehouse great for small business",
    price: "$ 3,125,000",
    type: "warehouse",
    bed: 4,
    bath: 4,
    size: 800,
    position: {
      lat: 37.39561833718522,
      lng: -122.21855116258479,
    },
  },
  {
    address: "98 Aleh Ave, Palo Alto, CA",
    description: "A lovely store on busy road",
    price: "$ 4,225,000",
    type: "store-alt",
    bed: 2,
    bath: 1,
    size: 210,
    position: {
      lat: 37.423928529779644,
      lng: -122.1087629822001,
    },
  },
  {
    address: "2117 Su St, MountainView, CA",
    description: "Single family house near golf club",
    price: "$ 1,700,000",
    type: "home",
    bed: 4,
    bath: 3,
    size: 200,
    position: {
      lat: 37.40578635332598,
      lng: -122.15043378466069,
    },
  },
  {
    address: "197 Alicia Dr, Santa Clara, CA",
    description: "Multifloor large warehouse",
    price: "$ 5,000,000",
    type: "warehouse",
    bed: 5,
    bath: 4,
    size: 700,
    position: {
      lat: 37.36399747905774,
      lng: -122.10465384268522,
    },
  },
  {
    address: "700 Jose Ave, Sunnyvale, CA",
    description: "3 storey townhouse with 2 car garage",
    price: "$ 3,850,000",
    type: "building",
    bed: 4,
    bath: 4,
    size: 600,
    position: {
      lat: 37.38343706184458,
      lng: -122.02340436985183,
    },
  },
  {
    address: "868 Will Ct, Cupertino, CA",
    description: "Single family house in great school zone",
    price: "$ 2,500,000",
    type: "home",
    bed: 3,
    bath: 2,
    size: 100,
    position: {
      lat: 37.34576403052,
      lng: -122.04455090047453,
    },
  },
  {
    address: "655 Haylee St, Santa Clara, CA",
    description: "2 storey store with large storage room",
    price: "$ 2,500,000",
    type: "store-alt",
    bed: 3,
    bath: 2,
    size: 450,
    position: {
      lat: 37.362863347890716,
      lng: -121.97802139023555,
    },
  },
  {
    address: "2019 Natasha Dr, San Jose, CA",
    description: "Single family house",
    price: "$ 2,325,000",
    type: "home",
    bed: 4,
    bath: 3.5,
    size: 500,
    position: {
      lat: 37.41391636421949,
      lng: -121.94592071575907,
    },
  },
];

initMap();
index.js

CSS

:root {
  --building-color: #FF9800;
  --house-color: #0288D1;
  --shop-color: #7B1FA2;
  --warehouse-color: #558B2F;
}

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

/*
 * Always set the map height explicitly to define the size of the div element
 * that contains the map.
 */
#map {
  height: 100%;
  width: 100%;
}

/*
 * Property styles in unhighlighted state.
 */
.property {
  align-items: center;
  background-color: #FFFFFF;
  border-radius: 50%;
  color: #263238;
  display: flex;
  font-size: 14px;
  gap: 15px;
  height: 30px;
  justify-content: center;
  padding: 4px;
  position: relative;
  position: relative;
  transition: all 0.3s ease-out;
  width: 30px;
}

.property::after {
  border-left: 9px solid transparent;
  border-right: 9px solid transparent;
  border-top: 9px solid #FFFFFF;
  content: "";
  height: 0;
  left: 50%;
  position: absolute;
  top: 95%;
  transform: translate(-50%, 0);
  transition: all 0.3s ease-out;
  width: 0;
  z-index: 1;
}

.property .icon {
  align-items: center;
  display: flex;
  justify-content: center;
  color: #FFFFFF;
}

.property .icon svg {
  height: 20px;
  width: auto;
}

.property .details {
  display: none;
  flex-direction: column;
  flex: 1;
}

.property .address {
  color: #9E9E9E;
  font-size: 10px;
  margin-bottom: 10px;
  margin-top: 5px;
}

.property .features {
  align-items: flex-end;
  display: flex;
  flex-direction: row;
  gap: 10px;
}

.property .features > div {
  align-items: center;
  background: #F5F5F5;
  border-radius: 5px;
  border: 1px solid #ccc;
  display: flex;
  font-size: 10px;
  gap: 5px;
  padding: 5px;
}

/*
 * Property styles in highlighted state.
 */
.property.highlight {
  background-color: #FFFFFF;
  border-radius: 8px;
  box-shadow: 10px 10px 5px rgba(0, 0, 0, 0.2);
  height: 80px;
  padding: 8px 15px;
  width: auto;
}

.property.highlight::after {
  border-top: 9px solid #FFFFFF;
}

.property.highlight .details {
  display: flex;
}

.property.highlight .icon svg {
  width: 50px;
  height: 50px;
}

.property .bed {
  color: #FFA000;
}

.property .bath {
  color: #03A9F4;
}

.property .size {
  color: #388E3C;
}

/*
 * House icon colors.
 */
.property.highlight:has(.fa-house) .icon {
  color: var(--house-color);
}

.property:not(.highlight):has(.fa-house) {
  background-color: var(--house-color);
}

.property:not(.highlight):has(.fa-house)::after {
  border-top: 9px solid var(--house-color);
}

/*
 * Building icon colors.
 */
.property.highlight:has(.fa-building) .icon {
  color: var(--building-color);
}

.property:not(.highlight):has(.fa-building) {
  background-color: var(--building-color);
}

.property:not(.highlight):has(.fa-building)::after {
  border-top: 9px solid var(--building-color);
}

/*
 * Warehouse icon colors.
 */
.property.highlight:has(.fa-warehouse) .icon {
  color: var(--warehouse-color);
}

.property:not(.highlight):has(.fa-warehouse) {
  background-color: var(--warehouse-color);
}

.property:not(.highlight):has(.fa-warehouse)::after {
  border-top: 9px solid var(--warehouse-color);
}

/*
 * Shop icon colors.
 */
.property.highlight:has(.fa-shop) .icon {
  color: var(--shop-color);
}

.property:not(.highlight):has(.fa-shop) {
  background-color: var(--shop-color);
}

.property:not(.highlight):has(.fa-shop)::after {
  border-top: 9px solid var(--shop-color);
}

style.css

HTML

<html>
  <head>
    <title>Advanced Markers with HTML</title>

    <script src="https://use.fontawesome.com/releases/v6.2.0/js/all.js"></script>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>

    <!-- 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: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "weekly"});</script>
  </body>
</html>
index.html

Prueba la muestra

Marcadores animados

En este ejemplo, se crea la animación tradicional de "rebote" con CSS y marcadores avanzados. En IntersectionObserver, se agrega el diseño de CSS drop. IntersectionObserver registra cuándo ingresa cada marcador al viewport, y agrega el diseño. Luego, el objeto de escucha de eventos animationend que la función createMarker() agregó a cada marcador quita el diseño.

Consulta la fuente

TypeScript

/**
   * Returns a random lat lng position within the map bounds.
   * @param {!google.maps.Map} map
   * @return {!google.maps.LatLngLiteral}
   */
 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 total = 100;
  const intersectionObserver = new IntersectionObserver((entries) => {
    for (const entry of entries) {
      if (entry.isIntersecting) {
        entry.target.classList.add('drop');
        intersectionObserver.unobserve(entry.target);
      }
    }
  });

  async function initMap(): Promise<void> {
    // Request needed libraries.
    const { Map } = await google.maps.importLibrary("maps") as google.maps.MapsLibrary;
    const { AdvancedMarkerElement } = await google.maps.importLibrary("marker") as google.maps.MarkerLibrary;

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

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

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

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

    controlUI.classList.add("ui-button");
    controlUI.innerText = "Reset the example";
    controlUI.addEventListener("click", () => {
      // Reset the example by reloading the map iframe.
      refreshMap();
    });
    controlDiv.appendChild(controlUI);
    map.controls[google.maps.ControlPosition.TOP_CENTER].push(controlDiv);
  }

  function createMarker(map, AdvancedMarkerElement) {    
    const advancedMarker = new AdvancedMarkerElement({
      position: getRandomPosition(map),
      map: map,
    });
    const content = advancedMarker.content as HTMLElement;
    content.style.opacity = '0'; 
    content.addEventListener('animationend', (event) => { 
      content.classList.remove('drop');
      content.style.opacity = '1';
    });
    const time = 2 + Math.random(); // 2s delay for easy to see the animation
    content.style.setProperty('--delay-time', time +'s');
    intersectionObserver.observe(content);
  }

  function refreshMap() {
      // Refresh the map.
      const mapContainer = document.getElementById('mapContainer');
      const map = document.getElementById('map');
      map!.remove();
      const mapDiv = document.createElement('div');
      mapDiv.id = 'map';
      mapContainer!.appendChild(mapDiv);
      initMap();
  }

initMap();
index.ts

JavaScript

/**
 * Returns a random lat lng position within the map bounds.
 * @param {!google.maps.Map} map
 * @return {!google.maps.LatLngLiteral}
 */
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 total = 100;
const intersectionObserver = new IntersectionObserver((entries) => {
  for (const entry of entries) {
    if (entry.isIntersecting) {
      entry.target.classList.add("drop");
      intersectionObserver.unobserve(entry.target);
    }
  }
});

async function initMap() {
  // Request needed libraries.
  const { Map } = await google.maps.importLibrary("maps");
  const { AdvancedMarkerElement } = await 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.
  google.maps.event.addListenerOnce(map, "idle", () => {
    for (let i = 0; i < 100; i++) {
      createMarker(map, AdvancedMarkerElement);
    }
  });

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

  controlUI.classList.add("ui-button");
  controlUI.innerText = "Reset the example";
  controlUI.addEventListener("click", () => {
    // Reset the example by reloading the map iframe.
    refreshMap();
  });
  controlDiv.appendChild(controlUI);
  map.controls[google.maps.ControlPosition.TOP_CENTER].push(controlDiv);
}

function createMarker(map, AdvancedMarkerElement) {
  const advancedMarker = new AdvancedMarkerElement({
    position: getRandomPosition(map),
    map: map,
  });
  const content = advancedMarker.content;

  content.style.opacity = "0";
  content.addEventListener("animationend", (event) => {
    content.classList.remove("drop");
    content.style.opacity = "1";
  });

  const time = 2 + Math.random(); // 2s delay for easy to see the animation

  content.style.setProperty("--delay-time", time + "s");
  intersectionObserver.observe(content);
}

function refreshMap() {
  // Refresh the map.
  const mapContainer = document.getElementById("mapContainer");
  const map = document.getElementById("map");

  map.remove();

  const mapDiv = document.createElement("div");

  mapDiv.id = "map";
  mapContainer.appendChild(mapDiv);
  initMap();
}

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;
}

/* set the default transition time */
:root {
  --delay-time: .5s;
}

#map {
  height: 100%;
}

#mapContainer {
  height: 100%;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

@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);
}

style.css

HTML

<html>
  <head>
    <title>Advanced Markers CSS Animation</title>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <div id="mapContainer">
      <div id="map" style="height: 100%"></div>
    </div>

    <!-- 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: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "weekly"});</script>
  </body>
</html>
index.html

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