Custom Overview Map

Example of OverviewMap control with advanced customization.

This example demonstrates how you can customize the overviewmap control using its supported options as well as defining custom CSS. You can also rotate the map using the shift key to see how the overview map reacts.

<!DOCTYPE html>
<html>
  <head>
    <title>Custom Overview Map</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css">
    <!-- 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>

    <style>
      .ol-custom-overviewmap,
      .ol-custom-overviewmap.ol-uncollapsible {
        bottom: auto;
        left: auto;
        right: 0;
        top: 0;
      }

      .ol-custom-overviewmap:not(.ol-collapsed)  {
        border: 1px solid black;
      }

      .ol-custom-overviewmap .ol-overviewmap-map {
        border: none;
        width: 300px;
      }

      .ol-custom-overviewmap .ol-overviewmap-box {
        border: 2px solid red;
      }

      .ol-custom-overviewmap:not(.ol-collapsed) button{
        bottom: auto;
        left: auto;
        right: 1px;
        top: 1px;
      }

      .ol-rotate {
        top: 170px;
        right: 0;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script>
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import {defaults as defaultControls, OverviewMap} from 'ol/control.js';
      import {defaults as defaultInteractions, DragRotateAndZoom} from 'ol/interaction.js';
      import TileLayer from 'ol/layer/Tile.js';
      import OSM from 'ol/source/OSM.js';


      var overviewMapControl = new OverviewMap({
        // see in overviewmap-custom.html to see the custom CSS used
        className: 'ol-overviewmap ol-custom-overviewmap',
        layers: [
          new TileLayer({
            source: new OSM({
              'url': 'https://{a-c}.tile.thunderforest.com/cycle/{z}/{x}/{y}.png' +
                  '?apikey=Your API key from http://www.thunderforest.com/docs/apikeys/ here'
            })
          })
        ],
        collapseLabel: '\u00BB',
        label: '\u00AB',
        collapsed: false
      });

      var map = new Map({
        controls: defaultControls().extend([
          overviewMapControl
        ]),
        interactions: defaultInteractions().extend([
          new DragRotateAndZoom()
        ]),
        layers: [
          new TileLayer({
            source: new OSM()
          })
        ],
        target: 'map',
        view: new View({
          center: [500000, 6000000],
          zoom: 7
        })
      });
    </script>
  </body>
</html>