Leaflet GeoJson

Access

A web application employing LeafletJS and GeoJson is enabled upon installation.

It can be access via the Leaflet tab on the home page:

../_images/leaflet-tab.png

It can also be access directly via url at:

http://domain.com/LeafletJSDemo.html

Usage

Once accessed using above, the app will appear as shown below:

../_images/leaflet-app1.png

Click on the US layer to view the getFeature info for the State.

The data will be displayed as below:

../_images/leaflet-app.png

Structure

The app is located at:

/vaw/www/html/LeafletJSDemo.html

On installation, data from PostgreSQL is exported to GeoJson format and saved to:

/var/www/html/states.json

Content

The content of the html page is displayed below.

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     <!doctype html>
     <html>
     <head>
     <style type="text/css">
     body {
     padding: 0;
     margin: 0;
     }

     html, body, #map {
     height: 100%;
     }

     </style>

     <link rel="stylesheet" href="https://unpkg.com/leaflet@1.1.0/dist/leaflet.css"
     integrity="sha512-wcw6ts8Anuw10Mzh9Ytw4pylW8+NAD4ch3lqm9lzAsTxg0GFeJgoAtxuCLREZSC5lUXdVyo/7yfsqFjQ4S+aKw=="
     crossorigin=""/>

     <script src="https://unpkg.com/leaflet@1.1.0/dist/leaflet.js"
     integrity="sha512-mNqn2Wg7tSToJhvHcqfzLMU6J4mkOImSPTxVZAdo+lcPlk+GhZmYgACEe0x35K7YzW1zJ7XyJV/TT1MrdXvMcA=="
     crossorigin=""></script>
     </head>

     <script src="http://code.jquery.com/jquery-2.1.0.min.js"></script>
     </head>
     <body>
     <div id="map"></div>
     <script>
     var osmUrl='http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png';
     var osmAttrib='Data &copy <a href="http://openstreetmap.org">OpenStreetMap</a> contributors';
     var osm = new L.TileLayer(osmUrl, {minZoom: 2, maxZoom: 8, attribution: osmAttrib});

     $.getJSON("states.geojson", function(data) {
     function onEachFeature(feature, layer) {
     layer.bindPopup("Name: " + feature.properties.STATE_NAME + "<br>" + "Abbreviation: " + feature.properties.STATE_ABBR);
     }
     var geojson = L.geoJson(data, {
     onEachFeature: onEachFeature
     });

     var map = L.map('map').fitBounds(geojson.getBounds());
     osm.addTo(map);
     geojson.addTo(map);
     });
       </script>
     </body>
     </html>