index.html


<!DOCTYPE html>
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<head>
    <title>Geo Search Example</title>
    <meta charset="utf-8" />

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.3.1/leaflet.css" />
    <!--[if lte IE 8]><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.3.1/leaflet.ie.css" /><![endif]-->
</head>
<body>
    <h1>Super Simple GeoJSON Nearby API</h1>
    <hr/>

    <p>For more information, check out the <a href="https://github.com/iandees/geojson-api">code on Github</a>.</p>

    <h3>Example</h3>
    <hr/>

    <p>
        The map below is a quick example of the API in action. Click anywhere to find the 5 closest points.
    </p>

    <div id="map" style="width: 600px; height: 400px"></div><br/>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.3.1/leaflet.js"></script>
    <script>

        var map = L.map('map').setView([39.272, -96.715], 5);

        L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
            maxZoom: 18,
            attribution: 'Map data &copy; <a href="https://openstreetmap.org">OpenStreetMap</a> contributors, <a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>'
        }).addTo(map);

        var geojsonLayer = new L.GeoJSON([], {
            onEachFeature: function (feature, layer) {
                layer.bindPopup("<pre>" + JSON.stringify(feature.properties, null, 1) + "</pre>");
            }
        });

        function onMapClick(e) {
            console.log("You clicked the map at " + e.latlng.toString());
            var xhrequest = new XMLHttpRequest();
            var url= "/points/nearby?lat=" + +e.latlng.lat.toFixed(6) + "&lon=" + +e.latlng.lng.toFixed(6);
            xhrequest.onreadystatechange = function() {
                if (xhrequest.readyState == 4) {
                    if (xhrequest.status == 200) {
                        geojsonLayer.clearLayers();
                        var layerItems =  JSON.parse(xhrequest.responseText);
                        geojsonLayer.addData(layerItems);
                        map.addLayer(geojsonLayer);
                    }
                }
            };
            xhrequest.open('GET', url, true);
            xhrequest.send(null);
        }

        map.on('click', onMapClick);

    </script>
</body>
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