Edit

Geographic Coordinates

Using geographic coordinates for the map view.

Calling the useGeographic function in the 'ol/proj' module makes it so the map view uses geographic coordinates (even if the view projection is not geographic).

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index.html<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Geographic Coordinates</title>
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
    <script src="https://code.jquery.com/jquery-2.2.3.min.js"></script>
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
    <style>
      .map {
        width: 100%;
        height:400px;
      }
      td {
        padding: 0 0.5em;
        text-align: right;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"><div id="popup"></div></div>
    <div id="info"></div>

    <script src="index.js"></script>
  </body>
</html>
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index.jsimport 'ol/ol.css';
import {useGeographic} from 'ol/proj';
import {Map, View, Feature, Overlay} from 'ol/index';
import {Point} from 'ol/geom';
import {Vector as VectorLayer, Tile as TileLayer} from 'ol/layer';
import {OSM, Vector as VectorSource} from 'ol/source';
import {Style, Circle, Fill} from 'ol/style';

useGeographic();

var place = [-110, 45];

var point = new Point(place);

var map = new Map({
  target: 'map',
  view: new View({
    center: place,
    zoom: 8
  }),
  layers: [
    new TileLayer({
      source: new OSM()
    }),
    new VectorLayer({
      source: new VectorSource({
        features: [
          new Feature(point)
        ]
      }),
      style: new Style({
        image: new Circle({
          radius: 9,
          fill: new Fill({color: 'red'})
        })
      })
    })
  ]
});

var element = document.getElementById('popup');

var popup = new Overlay({
  element: element,
  positioning: 'bottom-center',
  stopEvent: false,
  offset: [0, -10]
});
map.addOverlay(popup);

function formatCoordinate(coordinate) {
  return ("\n    <table>\n      <tbody>\n        <tr><th>lon</th><td>" + (coordinate[0].toFixed(2)) + "</td></tr>\n        <tr><th>lat</th><td>" + (coordinate[1].toFixed(2)) + "</td></tr>\n      </tbody>\n    </table>");
}

var info = document.getElementById('info');
map.on('moveend', function() {
  var view = map.getView();
  var center = view.getCenter();
  info.innerHTML = formatCoordinate(center);
});

map.on('click', function(event) {
  var feature = map.getFeaturesAtPixel(event.pixel)[0];
  if (feature) {
    var coordinate = feature.getGeometry().getCoordinates();
    popup.setPosition(coordinate);
    $(element).popover({
      placement: 'top',
      html: true,
      content: formatCoordinate(coordinate)
    });
    $(element).popover('show');
  } else {
    $(element).popover('destroy');
  }
});

map.on('pointermove', function(event) {
  if (map.hasFeatureAtPixel(event.pixel)) {
    map.getViewport().style.cursor = 'pointer';
  } else {
    map.getViewport().style.cursor = 'inherit';
  }
});
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package.json{
  "name": "geographic",
  "dependencies": {
    "ol": "6.1.1"
  },
  "devDependencies": {
    "parcel": "1.11.0"
  },
  "scripts": {
    "start": "parcel index.html",
    "build": "parcel build --experimental-scope-hoisting --public-url . index.html"
  }
}