Example sources in the examples dir

examples/tile-load-events.js

@@ -0,0 +1,104 @@
+goog.require('ol.Map');
+goog.require('ol.View');
+goog.require('ol.layer.Tile');
+goog.require('ol.source.TileJSON');
+
+
+
+/**
+ * Renders a progress bar.
+ * @param {Element} el The target element.
+ * @constructor
+ */
+function Progress(el) {
+  this.el = el;
+  this.loading = 0;
+  this.loaded = 0;
+}
+
+
+/**
+ * Increment the count of loading tiles.
+ */
+Progress.prototype.addLoading = function() {
+  if (this.loading === 0) {
+    this.show();
+  }
+  ++this.loading;
+  this.update();
+};
+
+
+/**
+ * Increment the count of loaded tiles.
+ */
+Progress.prototype.addLoaded = function() {
+  setTimeout(function() {
+    ++this.loaded;
+    this.update();
+  }.bind(this), 100);
+};
+
+
+/**
+ * Update the progress bar.
+ */
+Progress.prototype.update = function() {
+  var width = (this.loaded / this.loading * 100).toFixed(1) + '%';
+  this.el.style.width = width;
+  if (this.loading === this.loaded) {
+    this.loading = 0;
+    this.loaded = 0;
+    setTimeout(this.hide.bind(this), 500);
+  }
+};
+
+
+/**
+ * Show the progress bar.
+ */
+Progress.prototype.show = function() {
+  this.el.style.visibility = 'visible';
+};
+
+
+/**
+ * Hide the progress bar.
+ */
+Progress.prototype.hide = function() {
+  if (this.loading === this.loaded) {
+    this.el.style.visibility = 'hidden';
+    this.el.style.width = 0;
+  }
+};
+
+var progress = new Progress(document.getElementById('progress'));
+
+var source = new ol.source.TileJSON({
+  url: 'http://api.tiles.mapbox.com/v3/mapbox.world-bright.jsonp',
+  crossOrigin: 'anonymous'
+});
+
+source.on('tileloadstart', function(event) {
+  progress.addLoading();
+});
+
+source.on('tileloadend', function(event) {
+  progress.addLoaded();
+});
+source.on('tileloaderror', function(event) {
+  progress.addLoaded();
+});
+
+var map = new ol.Map({
+  logo: false,
+  layers: [
+    new ol.layer.Tile({source: source})
+  ],
+  renderer: exampleNS.getRendererFromQueryString(),
+  target: 'map',
+  view: new ol.View({
+    center: [0, 0],
+    zoom: 2
+  })
+});