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Tile Transitions

Custom configuration for opacity transitions on tiles.

By default tiles are rendered with an opacity transition - fading in over 250 ms. To disable this behavior, set the transition option of the tile source to 0.

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index.html<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Tile Transitions</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>
    <style>
      .map {
        width: 100%;
        height:400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <label>
      render with an opacity transition
      <input id="transition" type="checkbox" checked>
    </label>
    <script src="index.js"></script>
  </body>
</html>
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index.jsimport 'ol/ol.css';
import Map from 'ol/Map';
import View from 'ol/View';
import TileLayer from 'ol/layer/Tile';
import XYZ from 'ol/source/XYZ';

var key = 'pk.eyJ1IjoidHNjaGF1YiIsImEiOiJjaW5zYW5lNHkxMTNmdWttM3JyOHZtMmNtIn0.CDIBD8H-G2Gf-cPkIuWtRg';
var url = 'https://{a-c}.tiles.mapbox.com/v4/mapbox.world-bright/{z}/{x}/{y}.png?access_token=' + key;

var withTransition = new TileLayer({
  source: new XYZ({url: url})
});

var withoutTransition = new TileLayer({
  source: new XYZ({url: url, transition: 0}),
  visible: false
});

var map = new Map({
  layers: [withTransition, withoutTransition],
  target: 'map',
  view: new View({
    center: [0, 0],
    zoom: 2,
    maxZoom: 11
  })
});

document.getElementById('transition').addEventListener('change', function(event) {
  var transition = event.target.checked;
  withTransition.setVisible(transition);
  withoutTransition.setVisible(!transition);
});
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package.json{
  "name": "tile-transitions",
  "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"
  }
}