Example sources in the examples dir

examples/tileutfgrid.js

@@ -0,0 +1,71 @@
+goog.require('ol.Map');
+goog.require('ol.Overlay');
+goog.require('ol.View');
+goog.require('ol.layer.Tile');
+goog.require('ol.source.TileJSON');
+goog.require('ol.source.TileUTFGrid');
+
+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);
+});