This example shows how to read data from a TileUTFGrid layer.
Point to a country to see its name and flag.
<!DOCTYPE html> <html> <head> <title>TileUTFGrid example</title> <script src="https://code.jquery.com/jquery-1.11.2.min.js"></script> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css"> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script> <link rel="stylesheet" href="http://openlayers.org/en/3.8.1/css/ol.css" type="text/css"> <script src="http://openlayers.org/en/3.8.1/build/ol.js"></script> <style> #country-name { color: black; font-size: 12pt; font-weight: bold; text-shadow: white 0.1em 0.1em 0.2em; } </style> </head> <body> <div class="container-fluid"> <div class="row-fluid"> <div class="span12"> <div id="map" class="map"></div> </div> </div> <div style="display: none;"> <!-- Overlay with the country info --> <div id="country-info"> <div id="country-name"> </div> <img id="country-flag" src="" /> </div> </div> </div> <script> var mapLayer = new ol.layer.Tile({ source: new ol.source.TileJSON({ url: 'http://api.tiles.mapbox.com/v3/mapbox.geography-class.json' }) }); var gridSource = new ol.source.TileUTFGrid({ url: 'http://api.tiles.mapbox.com/v3/mapbox.geography-class.json' }); var gridLayer = new ol.layer.Tile({source: gridSource}); var view = new ol.View({ center: [0, 0], zoom: 1 }); var mapElement = document.getElementById('map'); var map = new ol.Map({ layers: [mapLayer, gridLayer], target: mapElement, view: view }); var infoElement = document.getElementById('country-info'); var flagElement = document.getElementById('country-flag'); var nameElement = document.getElementById('country-name'); var infoOverlay = new ol.Overlay({ element: infoElement, offset: [15, 15], stopEvent: false }); map.addOverlay(infoOverlay); var displayCountryInfo = function(coordinate) { var viewResolution = /** @type {number} */ (view.getResolution()); gridSource.forDataAtCoordinateAndResolution(coordinate, viewResolution, function(data) { // If you want to use the template from the TileJSON, // load the mustache.js library separately and call // info.innerHTML = Mustache.render(gridSource.getTemplate(), data); mapElement.style.cursor = data ? 'pointer' : ''; if (data) { /* jshint -W069 */ flagElement.src = 'data:image/png;base64,' + data['flag_png']; nameElement.innerHTML = data['admin']; /* jshint +W069 */ } infoOverlay.setPosition(data ? coordinate : undefined); }); }; map.on('pointermove', function(evt) { if (evt.dragging) { return; } var coordinate = map.getEventCoordinate(evt.originalEvent); displayCountryInfo(coordinate); }); map.on('click', function(evt) { displayCountryInfo(evt.coordinate); }); </script> </body> </html>