Feature selecting examples

examples/select-hover-features.js

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+import Map from '../src/ol/Map.js';
+import View from '../src/ol/View.js';
+import GeoJSON from '../src/ol/format/GeoJSON.js';
+import {Tile as TileLayer, Vector as VectorLayer} from '../src/ol/layer.js';
+import OSM from '../src/ol/source/OSM.js';
+import VectorSource from '../src/ol/source/Vector.js';
+import Style from '../src/ol/style/Style.js';
+import Fill from '../src/ol/style/Fill.js';
+import Stroke from '../src/ol/style/Stroke.js';
+
+const raster = new TileLayer({
+  source: new OSM()
+});
+
+const highlightStyle = new Style({
+  fill: new Fill({
+    color: 'rgba(255,255,255,0.7)'
+  }),
+  stroke: new Stroke({
+    color: '#3399CC',
+    width: 3
+  })
+});
+
+const vector = new VectorLayer({
+  source: new VectorSource({
+    url: 'data/geojson/countries.geojson',
+    format: new GeoJSON()
+  })
+});
+
+const map = new Map({
+  layers: [raster, vector],
+  target: 'map',
+  view: new View({
+    center: [0, 0],
+    zoom: 2
+  })
+});
+
+let selected = null;
+const status = document.getElementById('status');
+
+map.on('pointermove', function(e) {
+  if (selected !== null) {
+    selected.setStyle(undefined);
+    selected = null;
+  }
+
+  map.forEachFeatureAtPixel(e.pixel, function(f) {
+    selected = f;
+    f.setStyle(highlightStyle);
+    return true;
+  });
+
+  if (selected) {
+    status.innerHTML = ' Hovering: ' + selected.get('name');
+  } else {
+    status.innerHTML = ' ';
+  }
+});