Show tooltips on hover

How to show marker popups on hover with Mapbox.js, our open source JavaScript library.

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Show tooltips on hover</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.mapbox.com/mapbox.js/v3.1.0/mapbox.js'></script>
<link href='https://api.mapbox.com/mapbox.js/v3.1.0/mapbox.css' rel='stylesheet' />
<style>
  body { margin:0; padding:0; }
  #map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<div id='map'></div>

<script>
L.mapbox.accessToken = '<your access token here>';
var map = L.mapbox.map('map', 'mapbox.light')
  .setView([39.12367, -76.81229], 9);

var myLayer = L.mapbox.featureLayer().addTo(map);

var geojson = {
    type: 'FeatureCollection',
    features: [{
        type: 'Feature',
        properties: {
            title: 'Washington, D.C.',
            'marker-color': '#f86767',
            'marker-size': 'large',
            'marker-symbol': 'star',
            url: 'http://en.wikipedia.org/wiki/Washington,_D.C.'
        },
        geometry: {
            type: 'Point',
            coordinates: [-77.03201, 38.90065]
        }
    },
    {
        type: 'Feature',
        properties: {
            title: 'Baltimore, MD',
            'marker-color': '#7ec9b1',
            'marker-size': 'large',
            'marker-symbol': 'star',
            url: 'http://en.wikipedia.org/wiki/Baltimore'
        },
        geometry: {
            type: 'Point',
            coordinates: [-76.60767, 39.28755]
        }
    }]
};

myLayer.setGeoJSON(geojson);
myLayer.on('mouseover', function(e) {
    e.layer.openPopup();
});
myLayer.on('mouseout', function(e) {
    e.layer.closePopup();
});
</script>
to create your own custom map and use it in this example.
Use this example by copying its source into your own HTML page and replacing the Map ID with one of your own from your projects. Having trouble with JavaScript? Try out Codecademy or contact our support team.
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