Building Heights

map of building heights

by Keir Clarke

HTML

<link rel="stylesheet" href="https://api.tiles.mapbox.com/mapbox-gl-js/v0.25.1/mapbox-gl.css">
<script src="https://api.tiles.mapbox.com/mapbox-gl-js/v0.25.1/mapbox-gl.js"></script>
<div id='map'></div>
<div class='map-overlay top'>
    <div class='map-overlay-inner'>
        <fieldset>
            <label>Select layer</label>
            <select id='layer' name='layer'>
                <option value='0-5'>0-5</option>
                <option value='5-15'>5-15</option>
				<option value='15-30'>15-30</option>
				<option value='30-60'>30-60</option>
				<option value='60-145'>60-145</option>
				<option value='145-190'>145-190</option>
				<option value='190-240'>190-240</option>
				<option value='240+'>240+</option>
            </select>
        </fieldset>
        <fieldset>
            <label>Choose a color</label>
            <div id='swatches'></div>
        </fieldset>
    </div>
</div>

CSS

body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
.map-overlay {
    font: 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
    position: absolute;
    width: 200px;
    top: 0;
    left: 0;
    padding: 10px;
}

.map-overlay .map-overlay-inner {
    background-color: #fff;
    box-shadow:0 1px 2px rgba(0, 0, 0, 0.10);
    border-radius: 3px;
    padding: 10px;
    margin-bottom: 10px;
}

.map-overlay-inner fieldset {
    border: none;
    padding: 0;
    margin: 0 0 10px;
}

.map-overlay-inner fieldset:last-child {
    margin: 0;
}

.map-overlay-inner select {
    width: 100%;
}

.map-overlay-inner label {
    display: block;
    font-weight: bold;
    margin: 0 0 5px;
}

.map-overlay-inner button {
    display: inline-block;
    width: 36px;
    height: 20px;
    border: none;
    cursor: pointer;
}

.map-overlay-inner button:focus {
    outline: none;
}

.map-overlay-inner button:hover {
    box-shadow:inset 0 0 0 3px rgba(0, 0, 0, 0.10);
}

JavaScript

mapboxgl.accessToken = 'pk.eyJ1IjoiZ21hcHNtYW5pYSIsImEiOiJOYnlnSFpvIn0.5f62d0cnrWCA1KioxzXtqg';
var map = new mapboxgl.Map({
    container: 'map',
    style: 'mapbox://styles/gmapsmania/cityw8bmg00f22irqlwr84zju',
    center: [-74.0015212,40.7312319],
    zoom: 17.4
});

var swatches = document.getElementById('swatches');
var layer = document.getElementById('layer');
var colors = [
    '#ffffcc',
    '#a1dab4',
    '#41b6c4',
    '#2c7fb8',
    '#253494',
    '#fed976',
    '#feb24c',
    '#fd8d3c',
    '#f03b20',
    '#bd0026'
];

colors.forEach(function(color) {
    var swatch = document.createElement('button');
    swatch.style.backgroundColor = color;
    swatch.addEventListener('click', function() {
        map.setPaintProperty(layer.value, 'fill-color', color);
    });
    swatches.appendChild(swatch);
});