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Create a time slider

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

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<!DOCTYPE html>
<html>
<head>
<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.tiles.mapbox.com/mapbox-gl-js/v1.0.0/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v1.0.0/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<style>
.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, 0.20);
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;
}
</style>
<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>
<div class='map-overlay-inner'>
<div id='legend' class='legend'>
<div class='bar'></div>
<div>Magnitude (m)</div>
</div>
</div>
</div>
<script src='//d3js.org/d3.v3.min.js' charset='utf-8'></script>
<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 = [
'January',
'February',
'March',
'April',
'May',
'June',
'July',
'August',
'September',
'October',
'November',
'December'
];
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.
d3.json('https://docs.mapbox.com/mapbox-gl-js/assets/significant-earthquakes-2015.geojson', 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
});
map.addLayer({
'id': 'earthquake-circles',
'type': 'circle',
'source': 'earthquakes',
'paint': {
'circle-color': [
'interpolate',
['linear'],
['get', 'mag'],
6, '#FCA107',
8, '#7F3121'
],
'circle-opacity': 0.75,
'circle-radius': [
'interpolate',
['linear'],
['get', 'mag'],
6, 20,
8, 40
]
}
});
map.addLayer({
'id': 'earthquake-labels',
'type': 'symbol',
'source': 'earthquakes',
'layout': {
'text-field': ['concat', ['to-string', ['get', 'mag']], 'm'],
'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
filterBy(0);
document.getElementById('slider').addEventListener('input', function(e) {
var month = parseInt(e.target.value, 10);
filterBy(month);
});
});
});
</script>
</body>
</html>