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Create a time slider

Drag the range slider to visualize earthquakes that were greater than 5.9 magnitude in 2015.

<!DOCTYPE html>
<meta charset="utf-8" />
<title>Create a time slider</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://api.mapbox.com/mapbox-gl-js/v1.6.1/mapbox-gl.js"></script>
<link href="https://api.mapbox.com/mapbox-gl-js/v1.6.1/mapbox-gl.css" rel="stylesheet" />
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: 25%;
top: 0;
left: 0;
padding: 10px;
.map-overlay .map-overlay-inner {
background-color: #fff;
box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
border-radius: 3px;
padding: 10px;
margin-bottom: 10px;
.map-overlay h2 {
line-height: 24px;
display: block;
margin: 0 0 10px;
.map-overlay .legend .bar {
height: 10px;
width: 100%;
background: linear-gradient(to right, #fca107, #7f3121);
.map-overlay input {
background-color: transparent;
display: inline-block;
width: 100%;
position: relative;
margin: 0;
cursor: ew-resize;
<div id="map"></div>
<div class="map-overlay top">
<div class="map-overlay-inner">
<h2>Significant earthquakes in 2015</h2>
<label id="month"></label>
<input id="slider" type="range" min="0" max="11" step="1" value="0" />
<div class="map-overlay-inner">
<div id="legend" class="legend">
<div class="bar"></div>
<div>Magnitude (m)</div>
<script src="//d3js.org/d3.v3.min.js" charset="utf-8"></script>
mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/light-v10',
center: [31.4606, 20.7927],
zoom: 0.5
var months = [
function filterBy(month) {
var filters = ['==', 'month', month];
map.setFilter('earthquake-circles', filters);
map.setFilter('earthquake-labels', filters);
// Set the label to the month
document.getElementById('month').textContent = months[month];
map.on('load', function() {
// Data courtesy of http://earthquake.usgs.gov/
// Query for significant earthquakes in 2015 URL request looked like this:
// http://earthquake.usgs.gov/fdsnws/event/1/query
// ?format=geojson
// &starttime=2015-01-01
// &endtime=2015-12-31
// &minmagnitude=6'
// Here we're using d3 to help us make the ajax request but you can use
// Any request method (library or otherwise) you wish.
function(err, data) {
if (err) throw err;
// Create a month property value based on time
// used to filter against.
data.features = data.features.map(function(d) {
d.properties.month = new Date(d.properties.time).getMonth();
return d;
map.addSource('earthquakes', {
'type': 'geojson',
data: data
'id': 'earthquake-circles',
'type': 'circle',
'source': 'earthquakes',
'paint': {
'circle-color': [
['get', 'mag'],
'circle-opacity': 0.75,
'circle-radius': [
['get', 'mag'],
'id': 'earthquake-labels',
'type': 'symbol',
'source': 'earthquakes',
'layout': {
'text-field': [
['to-string', ['get', 'mag']],
'text-font': [
'Open Sans Bold',
'Arial Unicode MS Bold'
'text-size': 12
'paint': {
'text-color': 'rgba(0,0,0,0.5)'
// Set filter to first month of the year
// 0 = January
.addEventListener('input', function(e) {
var month = parseInt(e.target.value, 10);
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