Remove jQuery use from IGC example

examples/igc.js

@@ -51,9 +51,18 @@ var igcUrls = [
   'data/igc/Ulrich-Prinz.igc'
 ];
 
+function get(url, callback) {
+  var client = new XMLHttpRequest();
+  client.open('GET', url);
+  client.onload = function() {
+    callback(client.responseText);
+  };
+  client.send();
+}
+
 var igcFormat = new ol.format.IGC();
 for (var i = 0; i < igcUrls.length; ++i) {
-  $.ajax(igcUrls[i]).then(function(data) {
+  get(igcUrls[i], function(data) {
     var features = igcFormat.readFeatures(data,
         {featureProjection: 'EPSG:3857'});
     vectorSource.addFeatures(features);
@@ -184,8 +193,8 @@ var featureOverlay = new ol.FeatureOverlay({
   })
 });
 
-$('#time').on('input', function(event) {
-  var value = parseInt($(this).val(), 10) / 100;
+document.getElementById('time').addEventListener('input', function() {
+  var value = parseInt(this.value, 10) / 100;
   var m = time.start + (time.duration * value);
   vectorSource.forEachFeature(function(feature) {
     var geometry = /** @type {ol.geom.LineString} */ (feature.getGeometry());