7456574 by wboykinm

index.html

<!DOCTYPE html>
<html>
<head>
    <style>
        body { margin:0; padding:0; }
        #map { position:absolute; top:0; bottom:0; width:100%; }
    </style>
</head>
<div class="leaflet-marker-icon datacenter-marker edge leaflet-zoom-animated leaflet-clickable" tabindex="0" style="margin-left: -6px; margin-top: -6px; width: 12px; height: 12px; -webkit-transform: translate3d(738px, 323px, 0); z-index: 323;"><span class="dot"></span></div>
<body>
<style>
    .map-legend i {
        width: 18px;
        height: 18px;
        float: left;
        margin-right: 8px;
        opacity: 0.7;
    }
    .leaflet-popup-close-button {
        display: none;
    }
    .leaflet-popup-content-wrapper {
        pointer-events: none;
    }
</style>
<div id='map'></div>
<script type="text/javascript" src="//leafletjs.com/examples/us-states.js"></script>
<script type='text/javascript'>
    // Based on the Leaflet example from //leafletjs.com/examples/choropleth.html

    var map = L.mapbox.map('map', 'examples.map-vyofok3q').setView([37.8, -96], 4);

    var legend = L.mapbox.legendControl().addLegend(getLegendHTML()).addTo(map);

    var popup = new L.Popup({ autoPan: false });

    // statesData comes from the 'us-states.js' script included above
    var statesLayer = L.geoJson(statesData,  {
        style: getStyle,
        onEachFeature: onEachFeature
    }).addTo(map);

    function getStyle(feature) {
        return {
            weight: 2,
            opacity: 0.1,
            color: 'black',
            fillOpacity: 0.7,
            fillColor: getColor(feature.properties.density)
        };
    }

    // get color depending on population density value
    function getColor(d) {
        return d > 1000 ? '#8c2d04' :
            d > 500  ? '#cc4c02' :
            d > 200  ? '#ec7014' :
            d > 100  ? '#fe9929' :
            d > 50   ? '#fec44f' :
            d > 20   ? '#fee391' :
            d > 10   ? '#fff7bc' :
            '#ffffe5';
    }

    function onEachFeature(feature, layer) {
        layer.on({
            mousemove: mousemove,
            mouseout: mouseout,
            click: zoomToFeature
        });
    }

    var closeTooltip;

    function mousemove(e) {
        var layer = e.target;

        popup.setLatLng(e.latlng);
        popup.setContent('<h2>' + layer.feature.properties.name + '</h2>' +
            layer.feature.properties.density + ' people per square mile');

        if (!popup._map) popup.openOn(map);
        window.clearTimeout(closeTooltip);

        // highlight feature
        layer.setStyle({
            weight: 3,
            opacity: 0.3,
            fillOpacity: 0.9
        });

        if (!L.Browser.ie && !L.Browser.opera) {
            layer.bringToFront();
        }
    }

    function mouseout(e) {
        statesLayer.resetStyle(e.target);
        closeTooltip = window.setTimeout(function() {
            map.closePopup();
        }, 100);
    }

    function zoomToFeature(e) {
        map.fitBounds(e.target.getBounds());
    }

    function getLegendHTML() {
        var grades = [0, 10, 20, 50, 100, 200, 500, 1000],
            labels = [],
            from, to;

        for (var i = 0; i < grades.length; i++) {
            from = grades[i];
            to = grades[i + 1];

            labels.push(
                '<i style="background:' + getColor(from + 1) + '"></i> ' +
                from + (to ? '&ndash;' + to : '+'));
        }

        return '<span>People per square mile</span><br>' + labels.join('<br>');
    }

</script>
</body>
</html>