Draw lines between markers

Add a polyline that draws its coordinates from a featureLayer.

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Draw lines between markers</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.mapbox.com/mapbox.js/v3.3.0/mapbox.js'></script>
<link href='https://api.mapbox.com/mapbox.js/v3.3.0/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')
  .setView([37.77396, -122.4366], 12)
  .addLayer(L.mapbox.styleLayer('mapbox://styles/mapbox/streets-v11'));

var myFeatureLayer = L.mapbox.featureLayer('/mapbox.js/assets/data/sf_locations.geojson')
    .addTo(map);

myFeatureLayer.on('ready', function(e) {
  var line = [];

  this.eachLayer(function(marker) {
    line.push(marker.getLatLng());
  });

  var polyline_options = {
    color: '#000'
  };

  var polyline = L.polyline(line, polyline_options).addTo(map);
});
</script>
</body>
</html>
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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