Omnivore with a custom layer

Pass additional data as a third argument in addition to what's loaded with Omnivore.

<!DOCTYPE html>
<meta charset=utf-8 />
<title>Omnivore with a custom layer</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src=''></script>
<link href='' rel='stylesheet' />
  body { margin:0; padding:0; }
  #map { position:absolute; top:0; bottom:0; width:100%; }
<script src=''></script>

<div id='map'></div>

L.mapbox.accessToken = '<your access token here>';
var map ='map')

// Omnivore will AJAX-request this file behind the scenes and parse it:
// note that there are considerations:
// - The file must either be on the same domain as the page that requests it,
//   or both the server it is requested from and the user's browser must
//   support CORS.

// The omnivore functions take three arguments:
// - a URL of the file to fetch
// - options to the parser
// - a custom layer
// And they return the custom layer, which is by default an L.geoJson layer.
// The second two arguments are each optional. In this case we're supplying
// no arguments to the parser (null), but supplying a custom layer
// with custom styles. These styles are the same as any styles you would
// use with the default Leaflet API for L.geoJson, so read the documentation
// at for the full details.
var customLayer = L.geoJson(null, {
    style: function(feature) {
        return {
            color: '#f00'

var runLayer = omnivore.kml('/mapbox.js/assets/data/line.kml', null, customLayer)
    .on('ready', function() {
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.
Copy example