Dispatch an error on Geolocation failure

examples/geolocation.html

@@ -53,7 +53,8 @@
           <button id="locate"><i class="icon-screenshot"></i> locate</button>
           <div id="tags">geolocation, openstreetmap</div>
         </div>
-
+        <div class="span4 pull-right">
+          <div id="info" class="alert alert-error" style="display: none;"></div>
         </div>
 
     </div>

examples/geolocation.js

@@ -36,6 +36,12 @@ geolocation.addEventListener('accuracy_changed', function() {
     title: this.getAccuracy() + 'm from this point'
   });
 });
+geolocation.on('error', function(error) {
+  var info = document.getElementById('info');
+  info.innerHTML = error.message;
+  info.style.display = '';
+});
+
 
 $('#locate').click(function() {
   geolocation.setTracking(true);

src/ol/geolocation.js

@@ -1,10 +1,10 @@
 // FIXME handle geolocation not supported
-// FIXME handle geolocation errors
 
 goog.provide('ol.Geolocation');
 goog.provide('ol.GeolocationProperty');
 
 goog.require('goog.events');
+goog.require('goog.events.EventType');
 goog.require('goog.math');
 goog.require('ol.Coordinate');
 goog.require('ol.Object');
@@ -163,6 +163,8 @@ ol.Geolocation.prototype.positionChange_ = function(position) {
  * @param {GeolocationPositionError} error error object.
  */
 ol.Geolocation.prototype.positionError_ = function(error) {
+  error.type = goog.events.EventType.ERROR;
+  this.dispatchEvent(error);
 };