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Geocoding service

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JavaScript
function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 8,
    center: {lat: -34.397, lng: 150.644}
  });
  var geocoder = new google.maps.Geocoder();

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

function geocodeAddress(geocoder, resultsMap) {
  var address = document.getElementById('address').value;
  geocoder.geocode({'address': address}, function(results, status) {
    if (status === google.maps.GeocoderStatus.OK) {
      resultsMap.setCenter(results[0].geometry.location);
      var marker = new google.maps.Marker({
        map: resultsMap,
        position: results[0].geometry.location
      });
    } else {
      alert('Geocode was not successful for the following reason: ' + status);
    }
  });
}
JavaScript + HTML
<!DOCTYPE html>
<html>
  <head>
    <title>Geocoding service</title>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
#panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
}

/**
 * Provide the following styles for both ID and class, where ID represents an
 * actual existing "panel" with JS bound to its name, and the class is just
 * non-map content that may already have a different ID with JS bound to its
 * name.
 */

#panel, .panel {
  font-family: 'Roboto','sans-serif';
  line-height: 30px;
  padding-left: 10px;
}

#panel select, #panel input, .panel select, .panel input {
  font-size: 15px;
}

#panel select, .panel select {
  width: 100%;
}

#panel i, .panel i {
  font-size: 12px;
}

    </style>
  </head>
  <body>
    <div id="panel">
      <input id="address" type="textbox" value="Sydney, NSW">
      <input id="submit" type="button" value="Geocode">
    </div>
    <div id="map"></div>
    <script>
function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    zoom: 8,
    center: {lat: -34.397, lng: 150.644}
  });
  var geocoder = new google.maps.Geocoder();

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

function geocodeAddress(geocoder, resultsMap) {
  var address = document.getElementById('address').value;
  geocoder.geocode({'address': address}, function(results, status) {
    if (status === google.maps.GeocoderStatus.OK) {
      resultsMap.setCenter(results[0].geometry.location);
      var marker = new google.maps.Marker({
        map: resultsMap,
        position: results[0].geometry.location
      });
    } else {
      alert('Geocode was not successful for the following reason: ' + status);
    }
  });
}

    </script>
    <script src="https://maps.googleapis.com/maps/api/js?signed_in=true&callback=initMap"
        async defer></script>
  </body>
</html>

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