Reverse Geocoding

This example demonstrates reverse geocoding of coordinates to addresses.

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 },
    (
      results: google.maps.GeocoderResult[],
      status: google.maps.GeocoderStatus
    ) => {
      if (status === "OK") {
        if (results[0]) {
          map.setZoom(11);
          const marker = new google.maps.Marker({
            position: latlng,
            map: map
          });
          infowindow.setContent(results[0].formatted_address);
          infowindow.open(map, marker);
        } else {
          window.alert("No results found");
        }
      } else {
        window.alert("Geocoder failed due to: " + status);
      }
    }
  );
}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 }, (results, status) => {
    if (status === "OK") {
      if (results[0]) {
        map.setZoom(11);
        const marker = new google.maps.Marker({
          position: latlng,
          map: map
        });
        infowindow.setContent(results[0].formatted_address);
        infowindow.open(map, marker);
      } else {
        window.alert("No results found");
      }
    } else {
      window.alert("Geocoder failed due to: " + status);
    }
  });
}
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

<!DOCTYPE html>
<html>
  <head>
    <title>Reverse Geocoding</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./app.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>
  </body>
</html>sample.html

All

<!DOCTYPE html>
<html>
  <head>
    <title>Reverse Geocoding</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <style type="text/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>
    <script>
      "use strict";

      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
          },
          (results, status) => {
            if (status === "OK") {
              if (results[0]) {
                map.setZoom(11);
                const marker = new google.maps.Marker({
                  position: latlng,
                  map: map
                });
                infowindow.setContent(results[0].formatted_address);
                infowindow.open(map, marker);
              } else {
                window.alert("No results found");
              }
            } else {
              window.alert("Geocoder failed due to: " + status);
            }
          }
        );
      }
    </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>
  </body>
</html>
inline.html

"use strict"; 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 }, (results, status) => { if (status === "OK") { if (results[0]) { map.setZoom(11); const marker = new google.maps.Marker({ position: latlng, map: map }); infowindow.setContent(results[0].formatted_address); infowindow.open(map, marker); } else { window.alert("No results found"); } } else { window.alert("Geocoder failed due to: " + status); } } ); }

/* 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; }

<!DOCTYPE html> <html> <head> <title>Reverse Geocoding</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBIwzALxUPNbatRBj3Xi1Uhp0fFzwWNBkE&callback=initMap&libraries=&v=weekly" defer ></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> </body> </html>

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A skeleton starter application using TypeScript, Webpack, and Babel can be generated from this sample using one of the methods below.

Run Locally

Node.js is required to run this sample locally. Follow these instructions to install Node.js and NPM.

npm i -g '@googlemaps/js-samples'
googlemaps-js-samples init geocoding-reverse DESTINATION_FOLDER

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