Reverse Geocoding

This example demonstrates reverse geocoding of coordinates to addresses.

Read the documentation.

TypeScript

function initMap(): void {
  const map = new google.maps.Map(
    document.getElementById("map") as HTMLElement,
    {
      zoom: 8,
      center: { lat: 40.731, lng: -73.997 },
    }
  );
  const geocoder = new google.maps.Geocoder();
  const infowindow = new google.maps.InfoWindow();

  (document.getElementById("submit") as HTMLElement).addEventListener(
    "click",
    () => {
      geocodeLatLng(geocoder, map, infowindow);
    }
  );
}

function geocodeLatLng(
  geocoder: google.maps.Geocoder,
  map: google.maps.Map,
  infowindow: google.maps.InfoWindow
) {
  const input = (document.getElementById("latlng") as HTMLInputElement).value;
  const latlngStr = input.split(",", 2);
  const latlng = {
    lat: parseFloat(latlngStr[0]),
    lng: parseFloat(latlngStr[1]),
  };

  geocoder
    .geocode({ location: latlng })
    .then((response) => {
      if (response.results[0]) {
        map.setZoom(11);

        const marker = new google.maps.Marker({
          position: latlng,
          map: map,
        });

        infowindow.setContent(response.results[0].formatted_address);
        infowindow.open(map, marker);
      } else {
        window.alert("No results found");
      }
    })
    .catch((e) => window.alert("Geocoder failed due to: " + e));
}

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

JavaScript

function initMap() {
  const map = new google.maps.Map(document.getElementById("map"), {
    zoom: 8,
    center: { lat: 40.731, lng: -73.997 },
  });
  const geocoder = new google.maps.Geocoder();
  const infowindow = new google.maps.InfoWindow();

  document.getElementById("submit").addEventListener("click", () => {
    geocodeLatLng(geocoder, map, infowindow);
  });
}

function geocodeLatLng(geocoder, map, infowindow) {
  const input = document.getElementById("latlng").value;
  const latlngStr = input.split(",", 2);
  const latlng = {
    lat: parseFloat(latlngStr[0]),
    lng: parseFloat(latlngStr[1]),
  };

  geocoder
    .geocode({ location: latlng })
    .then((response) => {
      if (response.results[0]) {
        map.setZoom(11);

        const marker = new google.maps.Marker({
          position: latlng,
          map: map,
        });

        infowindow.setContent(response.results[0].formatted_address);
        infowindow.open(map, marker);
      } else {
        window.alert("No results found");
      }
    })
    .catch((e) => window.alert("Geocoder failed due to: " + e));
}

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 {
  position: absolute;
  top: 5px;
  left: 50%;
  margin-left: -180px;
  width: 350px;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
}

#latlng {
  width: 225px;
}

style.css

HTML

<html>
  <head>
    <title>Reverse Geocoding</title>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <div id="floating-panel">
      <input id="latlng" type="text" value="40.714224,-73.961452" />
      <input id="submit" type="button" value="Reverse Geocode" />
    </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-geocoding-reverse 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