Javascript – loading a local GeoJSON file and using it with the Google Maps Javascript API v3 data layer

geojsongoogle-mapshtmljavascriptstyling

I have created a JSON FeatureCollection that works in the DataLayer: Drag and Drop tutorial. It is just a collection of 2 roads so far, but I cannot figure out how to get the JSON file to load. It is a local file for now, so I thought calling it up and styling it ala tutorial would put me on the right path. But it isn't working. Here are the HTML and the JSON files.

    <!DOCTYPE html>
    <html>
    <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <title>FMRE Main Map</title>
    <!-- Style Section for the Window -->
    <style>
    html { height: 610px; width: 575px; }
    body { height: 610px; width:575px; margin: 0; padding: 0 }
    #map-canvas { height: 604px; width: 566px;}
    }
    </style>
    <!-- Calling the Google Map API version 3 -->
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
    <!-- Styling the Custom Main Map -->
    <script>
    var fmreMain = new google.maps.LatLng(29.681418,-95.714802);
    var MY_MAPTYPE_ID = 'custom_style';
    <!-- Styling for the Different Features on the Map from Google -->
    function initialize() {

    var featureOpts = [
      {
        "featureType": "poi.sports_complex",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.attraction",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.business",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "landscape.man_made",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.medical",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.government",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.place_of_worship",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.attraction",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.park",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "poi.park",
        "elementType": "labels.text",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "administrative.land_parcel",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.local",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.arterial",
        "elementType": "labels.text",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.highway",
        "elementType": "labels.icon",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.highway",
        "elementType": "labels.text",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.highway",
        "elementType": "geometry",
        "stylers": [
          {  "visibility": "off" }
        ]
      },
      {
        "featureType": "road.arterial",
        "elementType": "geometry",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.arterial",
        "elementType": "labels.text",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "road.arterial",
        "elementType": "labels.icon",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "water",
        "elementType": "labels.text",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "water",
        "stylers": [
          { "color": "#0000ff" }
        ]
      },
      {
        "featureType": "landscape.natural.landcover",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "landscape.natural.terrain",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "administrative.locality",
        "stylers": [
          { "visibility": "off" }
        ]
      },
      {
        "featureType": "administrative.neighborhood",
        "stylers": [
          { "visibility": "off" }
        ]
      }

    ];

    <!-- Setting for the Main Map -->

    var mapOptions = {
        center: fmreMain,
        backgroundColor: "#330033",
        zoom: 11,
        maxZoom: 12,
        minZoom: 10,
        zoomControl: false,
        mapTypeControl: false,
        streetViewControl: false,
        panControl: false,
        mapTypeId: MY_MAPTYPE_ID
    };

    map = new google.maps.Map(document.getElementById('map-canvas'),
          mapOptions);

    <!-- Settings for the Custom View Box -->

    var styledMapOptions = {
        name: 'FMRE',
        alt: 'Katy Areas'
                };

      var customMapType = new google.maps.StyledMapType(featureOpts,                 styledMapOptions);

    map.data.loadGeoJson('\JSON_MAP_COMPONENTS\Area_Main_Roads.json');

      var featureStyle = {
        strokeColor: '#ff3333',
        strokeWeight: 4
      }

    map.data.setStyle(featureStyle);

    map.mapTypes.set(MY_MAPTYPE_ID, customMapType, featureStyle);

    }

    google.maps.event.addDomListener(window, 'load', initialize);

    </script>

    </head>

    <body>
    <div id="map-canvas"></div>
    </body>
    </html>

GeoJSON File

        { "type": "FeatureCollection",
        "features": [

    { "type": "Feature",
     "geometry": 
    { "type": "LineString",   "coordinates": [
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Best Solution

I wouldn't expect loadGeoJSON to work with a local file (for security reasons most browsers prohibit access to the local filesystem by default). If you want to use local data, use the addGeoJSON method:

var data = {... your GeoJSON ...};

map.data.addGeoJson(data);
var featureStyle = {
    strokeColor: '#ff3333',
    strokeWeight: 4
}

map.data.setStyle(featureStyle);

working fiddle

This works for me on my local computer in Chrome:

  • in the head (SO_20140815_data.js is below):

    <!-- Calling the Google Map API version 3 -->
    <script src="https://maps.googleapis.com/maps/api/js?v=3.exp"></script>
    <script src="SO_20140815_data.js"></script>
    
  • at the end of initialize

    map = new google.maps.Map(document.getElementById('map-canvas'),
          mapOptions);
    
    <!-- Settings for the Custom View Box -->
    
    var styledMapOptions = {
        name: 'FMRE',
        alt: 'Katy Areas'
                };
    
      var customMapType = new google.maps.StyledMapType(featureOpts, styledMapOptions);
    
    map.data.addGeoJson(data);
    
      var featureStyle = {
        strokeColor: '#ff3333',
        strokeWeight: 4
      }
    
    map.data.setStyle(featureStyle);
    
    map.mapTypes.set(MY_MAPTYPE_ID, customMapType, featureStyle);
    
  • SO_20140815_data.js

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