UTFGrid interactivity from multiple layers

Pulling interactivity from overlapping layers made in TileMill

<!DOCTYPE html>
<meta charset=utf-8 />
<title>UTFGrid interactivity from multiple layers</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.mapbox.com/mapbox.js/v3.3.1/mapbox.js'></script>
<link href='https://api.mapbox.com/mapbox.js/v3.3.1/mapbox.css' rel='stylesheet' />
  body { margin:0; padding:0; }
  #map { position:absolute; top:0; bottom:0; width:100%; }
<div id='map'></div>
L.mapbox.accessToken = '<your access token here>';
var map = L.mapbox.map('map')
    .setView([40, -100], 4)

// Pulling multiple layers of interactivity isn't too tricky, it
// just requires that you don't use compositing, and instead add each
// layer as its components: a tileLayer, a gridLayer, and a gridControl
var birdTiles = L.mapbox.tileLayer('examples.bird-species').addTo(map),
    nprTiles = L.mapbox.tileLayer('examples.npr-stations').addTo(map);

var nprGrid = L.mapbox.gridLayer('examples.npr-stations').addTo(map),
    birdGrid = L.mapbox.gridLayer('examples.bird-species').addTo(map);

var nprControl = L.mapbox.gridControl(nprGrid).addTo(map),
    birdControl = L.mapbox.gridControl(birdGrid).addTo(map);
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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