Customizing a Google Map: Custom Markers

Overview

This tutorial teaches you how to change the icon of a Google maps marker. It is beneficial to know the basics of creating markers when using this tutorial.

The following map is an example of a map that uses customized markers.

The section below lists all of the code that you need to create the map in this tutorial.

var map;
function initMap() {
  map = new google.maps.Map(document.getElementById('map'), {
    zoom: 16,
    center: new google.maps.LatLng(-33.91722, 151.23064),
    mapTypeId: 'roadmap'
  });

  var iconBase = 'https://maps.google.com/mapfiles/kml/shapes/';
  var icons = {
    parking: {
      icon: iconBase + 'parking_lot_maps.png'
    },
    library: {
      icon: iconBase + 'library_maps.png'
    },
    info: {
      icon: iconBase + 'info-i_maps.png'
    }
  };

  var features = [
    {
      position: new google.maps.LatLng(-33.91721, 151.22630),
      type: 'info'
    }, {
      position: new google.maps.LatLng(-33.91539, 151.22820),
      type: 'info'
    }, {
      position: new google.maps.LatLng(-33.91747, 151.22912),
      type: 'info'
    }, {
      position: new google.maps.LatLng(-33.91910, 151.22907),
      type: 'info'
    }, {
      position: new google.maps.LatLng(-33.91725, 151.23011),
      type: 'info'
    }, {
      position: new google.maps.LatLng(-33.91872, 151.23089),
      type: 'info'
    }, {
      position: new google.maps.LatLng(-33.91784, 151.23094),
      type: 'info'
    }, {
      position: new google.maps.LatLng(-33.91682, 151.23149),
      type: 'info'
    }, {
      position: new google.maps.LatLng(-33.91790, 151.23463),
      type: 'info'
    }, {
      position: new google.maps.LatLng(-33.91666, 151.23468),
      type: 'info'
    }, {
      position: new google.maps.LatLng(-33.916988, 151.233640),
      type: 'info'
    }, {
      position: new google.maps.LatLng(-33.91662347903106, 151.22879464019775),
      type: 'parking'
    }, {
      position: new google.maps.LatLng(-33.916365282092855, 151.22937399734496),
      type: 'parking'
    }, {
      position: new google.maps.LatLng(-33.91665018901448, 151.2282474695587),
      type: 'parking'
    }, {
      position: new google.maps.LatLng(-33.919543720969806, 151.23112279762267),
      type: 'parking'
    }, {
      position: new google.maps.LatLng(-33.91608037421864, 151.23288232673644),
      type: 'parking'
    }, {
      position: new google.maps.LatLng(-33.91851096391805, 151.2344058214569),
      type: 'parking'
    }, {
      position: new google.maps.LatLng(-33.91818154739766, 151.2346203981781),
      type: 'parking'
    }, {
      position: new google.maps.LatLng(-33.91727341958453, 151.23348314155578),
      type: 'library'
    }
  ];

  // Create markers.
  features.forEach(function(feature) {
    var marker = new google.maps.Marker({
      position: feature.position,
      icon: icons[feature.type].icon,
      map: map
    });
  });
}
<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;
}
<!-- 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>
    <title>Custom Markers</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <style>
<span class="metadata-marker" style="display: none;" data-region_tag="css"></span>      /* 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;
      }
    </style>
  </head>
  <body>
<span class="metadata-marker" style="display: none;" data-region_tag="html-body"></span>    <div id="map"></div>
    <script>
<span class="metadata-marker" style="display: none;" data-region_tag="script-body"></span>      var map;
      function initMap() {
        map = new google.maps.Map(document.getElementById('map'), {
          zoom: 16,
          center: new google.maps.LatLng(-33.91722, 151.23064),
          mapTypeId: 'roadmap'
        });

        var iconBase = 'https://maps.google.com/mapfiles/kml/shapes/';
        var icons = {
          parking: {
            icon: iconBase + 'parking_lot_maps.png'
          },
          library: {
            icon: iconBase + 'library_maps.png'
          },
          info: {
            icon: iconBase + 'info-i_maps.png'
          }
        };

        var features = [
          {
            position: new google.maps.LatLng(-33.91721, 151.22630),
            type: 'info'
          }, {
            position: new google.maps.LatLng(-33.91539, 151.22820),
            type: 'info'
          }, {
            position: new google.maps.LatLng(-33.91747, 151.22912),
            type: 'info'
          }, {
            position: new google.maps.LatLng(-33.91910, 151.22907),
            type: 'info'
          }, {
            position: new google.maps.LatLng(-33.91725, 151.23011),
            type: 'info'
          }, {
            position: new google.maps.LatLng(-33.91872, 151.23089),
            type: 'info'
          }, {
            position: new google.maps.LatLng(-33.91784, 151.23094),
            type: 'info'
          }, {
            position: new google.maps.LatLng(-33.91682, 151.23149),
            type: 'info'
          }, {
            position: new google.maps.LatLng(-33.91790, 151.23463),
            type: 'info'
          }, {
            position: new google.maps.LatLng(-33.91666, 151.23468),
            type: 'info'
          }, {
            position: new google.maps.LatLng(-33.916988, 151.233640),
            type: 'info'
          }, {
            position: new google.maps.LatLng(-33.91662347903106, 151.22879464019775),
            type: 'parking'
          }, {
            position: new google.maps.LatLng(-33.916365282092855, 151.22937399734496),
            type: 'parking'
          }, {
            position: new google.maps.LatLng(-33.91665018901448, 151.2282474695587),
            type: 'parking'
          }, {
            position: new google.maps.LatLng(-33.919543720969806, 151.23112279762267),
            type: 'parking'
          }, {
            position: new google.maps.LatLng(-33.91608037421864, 151.23288232673644),
            type: 'parking'
          }, {
            position: new google.maps.LatLng(-33.91851096391805, 151.2344058214569),
            type: 'parking'
          }, {
            position: new google.maps.LatLng(-33.91818154739766, 151.2346203981781),
            type: 'parking'
          }, {
            position: new google.maps.LatLng(-33.91727341958453, 151.23348314155578),
            type: 'library'
          }
        ];

        // Create markers.
        features.forEach(function(feature) {
          var marker = new google.maps.Marker({
            position: feature.position,
            icon: icons[feature.type].icon,
            map: map
          });
        });
      }
    </script>
    <script async defer
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
    </script>
  </body>
</html>

Customizing a map marker

The image below displays a Google maps marker with the default red icon.

You can change this icon to an image of your choice. The table below explains the code that customizes the default marker to use an icon for parking lots.

Code and description
var iconBase = 'https://maps.google.com/mapfiles/kml/shapes/';
  var marker = new google.maps.Marker({
    position: myLatLng,
    map: map,
    icon: iconBase + 'parking_lot_maps.png'
  });

Adds the icon property to the MarkerOptions object, to change the marker’s icon.
The icon property can be either a string (the URL to the marker icon), or an Icon object.
See the customized marker icon below.

Customizing markers by map features

Each point of interest in the list of campus features has a type attribute. Notice how the code extract below specifies the parking, library and info types. You can customize the marker icon depending on the map feature type you set it to.

var iconBase = 'https://maps.google.com/mapfiles/kml/shapes/';
var icons = {
  parking: {
    icon: iconBase + 'parking_lot_maps.png'
  },
  library: {
    icon: iconBase + 'library_maps.png'
  },
  info: {
    icon: iconBase + 'info-i_maps.png'
  }
};

function addMarker(feature) {
  var marker = new google.maps.Marker({
    position: feature.position,
    icon: icons[feature.type].icon,
    map: map
  });
}

More information

  • The image on a marker is called its 'icon'.
  • A marker is also known as a 'pin'.

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ご不明な点がありましたら、Google のサポートページをご覧ください。