Geocoding Component Restrictions

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

Read the documentation.

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

  document.getElementById('submit').addEventListener('click', function() {
    geocodeAddress(geocoder, map);
  });
}

function geocodeAddress(geocoder, map) {
  geocoder.geocode({
    componentRestrictions: {
      country: 'AU',
      postalCode: '2000'
    }
  }, function(results, status) {
    if (status === 'OK') {
      map.setCenter(results[0].geometry.location);
      new google.maps.Marker({
        map: map,
        position: results[0].geometry.location
      });
    } else {
      window.alert('Geocode was not successful for the following reason: ' +
          status);
    }
  });
}
<div id="floating-panel">
  <pre>componentRestrictions: {country: "AU", postalCode: "2000"}</pre>
  <button id="submit">Geocode</button>
</div>
<div id="map"></div>
/* 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;
}
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>

Try it yourself

You can experiment with this code in JSFiddle by clicking the <> icon in the top-right corner of the code window.

<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Geocoding Component Restriction</title>
    <style>
      /* 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>
  </head>
  <body>
    <div id="floating-panel">
      <pre>componentRestrictions: {country: "AU", postalCode: "2000"}</pre>
      <button id="submit">Geocode</button>
    </div>
    <div id="map"></div>
    <script>
      function initMap() {
        var geocoder = new google.maps.Geocoder;
        var map = new google.maps.Map(document.getElementById('map'), {
          zoom: 8,
          center: {lat: -33.865, lng: 151.209}
        });

        document.getElementById('submit').addEventListener('click', function() {
          geocodeAddress(geocoder, map);
        });
      }

      function geocodeAddress(geocoder, map) {
        geocoder.geocode({
          componentRestrictions: {
            country: 'AU',
            postalCode: '2000'
          }
        }, function(results, status) {
          if (status === 'OK') {
            map.setCenter(results[0].geometry.location);
            new google.maps.Marker({
              map: map,
              position: results[0].geometry.location
            });
          } else {
            window.alert('Geocode was not successful for the following reason: ' +
                status);
          }
        });
      }
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
    </script>
  </body>
</html>