Geocoding Component Restrictions

  • This example demonstrates how to use the Google Maps Geocoding service to find an address ("483 George St.") while restricting the results to a specific postal code ("2000") and country ("AU").

  • The provided code snippets show implementations in both TypeScript and JavaScript, along with HTML and CSS for displaying the results on a map.

  • Component restrictions are used to narrow down the search area and ensure the returned location is within the desired area of Sydney, Australia.

  • Users can interact with the map by clicking a "Geocode" button, which triggers the geocoding request and places a marker on the map at the identified location.

  • This sample can be run locally using Git and Node.js, or tested directly through provided links to JSFiddle and Google Cloud Shell.

This example creates a request to the geocoding service that restricts the results to a particular postal area within Sydney, Australia.

Read the documentation.

TypeScript

function initMap(): void {
  const geocoder = new google.maps.Geocoder();
  const map = new google.maps.Map(
    document.getElementById("map") as HTMLElement,
    {
      zoom: 8,
      center: { lat: -33.865, lng: 151.209 },
    }
  );

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

function geocodeAddress(geocoder: google.maps.Geocoder, map: google.maps.Map) {
  geocoder
    .geocode({
      address: "483 George St.",
      componentRestrictions: {
        country: "AU",
        postalCode: "2000",
      },
    })
    .then(({ results }) => {
      map.setCenter(results[0].geometry.location);
      new google.maps.Marker({
        map,
        position: results[0].geometry.location,
      });
    })
    .catch((e) =>
      window.alert("Geocode was not successful for the following reason: " + e)
    );
}

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

JavaScript

function initMap() {
  const geocoder = new google.maps.Geocoder();
  const map = new google.maps.Map(document.getElementById("map"), {
    zoom: 8,
    center: { lat: -33.865, lng: 151.209 },
  });

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

function geocodeAddress(geocoder, map) {
  geocoder
    .geocode({
      address: "483 George St.",
      componentRestrictions: {
        country: "AU",
        postalCode: "2000",
      },
    })
    .then(({ results }) => {
      map.setCenter(results[0].geometry.location);
      new google.maps.Marker({
        map,
        position: results[0].geometry.location,
      });
    })
    .catch((e) =>
      window.alert("Geocode was not successful for the following reason: " + 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;
}

style.css

HTML

<html>
  <head>
    <title>Geocoding Component Restriction</title>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <div id="floating-panel">
      <code>componentRestrictions: {country: "AU", postalCode: "2000"}</code
      ><br />
      <button id="submit">Geocode</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-geocoding-component-restriction 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