Marker Animations With setTimeout()

This example uses window.setTimeout() to place markers on the map consecutively rather than all at once when a Drop Markers button is clicked.

Read the documentation.

TypeScript

// If you're adding a number of markers, you may want to drop them on the map
// consecutively rather than all at once. This example shows how to use
// window.setTimeout() to space your markers' animation.

const neighborhoods: google.maps.LatLngLiteral[] = [
  { lat: 52.511, lng: 13.447 },
  { lat: 52.549, lng: 13.422 },
  { lat: 52.497, lng: 13.396 },
  { lat: 52.517, lng: 13.394 },
];

let markers: google.maps.Marker[] = [];
let map: google.maps.Map;

function initMap(): void {
  map = new google.maps.Map(document.getElementById("map") as HTMLElement, {
    zoom: 12,
    center: { lat: 52.52, lng: 13.41 },
  });

  document.getElementById("drop")!.addEventListener("click", drop);
}

function drop(): void {
  clearMarkers();

  for (let i = 0; i < neighborhoods.length; i++) {
    addMarkerWithTimeout(neighborhoods[i], i * 200);
  }
}

function addMarkerWithTimeout(
  position: google.maps.LatLngLiteral,
  timeout: number
): void {
  window.setTimeout(() => {
    markers.push(
      new google.maps.Marker({
        position: position,
        map,
        animation: google.maps.Animation.DROP,
      })
    );
  }, timeout);
}

function clearMarkers(): void {
  for (let i = 0; i < markers.length; i++) {
    markers[i].setMap(null);
  }

  markers = [];
}

declare global {
  interface Window {
    initMap: () => void;
  }
}
window.initMap = initMap;
index.ts

JavaScript

// If you're adding a number of markers, you may want to drop them on the map
// consecutively rather than all at once. This example shows how to use
// window.setTimeout() to space your markers' animation.
const neighborhoods = [
  { lat: 52.511, lng: 13.447 },
  { lat: 52.549, lng: 13.422 },
  { lat: 52.497, lng: 13.396 },
  { lat: 52.517, lng: 13.394 },
];
let markers = [];
let map;

function initMap() {
  map = new google.maps.Map(document.getElementById("map"), {
    zoom: 12,
    center: { lat: 52.52, lng: 13.41 },
  });
  document.getElementById("drop").addEventListener("click", drop);
}

function drop() {
  clearMarkers();

  for (let i = 0; i < neighborhoods.length; i++) {
    addMarkerWithTimeout(neighborhoods[i], i * 200);
  }
}

function addMarkerWithTimeout(position, timeout) {
  window.setTimeout(() => {
    markers.push(
      new google.maps.Marker({
        position: position,
        map,
        animation: google.maps.Animation.DROP,
      }),
    );
  }, timeout);
}

function clearMarkers() {
  for (let i = 0; i < markers.length; i++) {
    markers[i].setMap(null);
  }

  markers = [];
}

window.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;
}

#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: "Roboto", "sans-serif";
  line-height: 30px;
  padding-left: 10px;
}

#floating-panel {
  margin-left: -52px;
}

style.css

HTML

<html>
  <head>
    <title>Marker Animations With setTimeout()</title>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <div id="floating-panel">
      <button id="drop">Drop Markers</button>
    </div>
    <div id="map"></div>

    <!-- 
      The `defer` attribute causes the script to execute after the full HTML
      document has been parsed. For non-blocking uses, avoiding race conditions,
      and consistent behavior across browsers, consider loading using Promises. See
      https://developers.google.com/maps/documentation/javascript/load-maps-js-api
      for more information.
      -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly"
      defer
    ></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 -b sample-marker-animations-iteration https://github.com/googlemaps/js-samples.git
  cd js-samples
  npm i
  npm start

Other samples can be tried by switching to any branch beginning with sample-SAMPLE_NAME. 

  git checkout sample-SAMPLE_NAME
  npm i
  npm start