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Custom map element

es2015 web-component custom-element shadow-dom

Example of a custom element with a map.

The example creates and registers a custom element, ol-map, which contains a simple map. Note: Only works in browsers that supports ShadowRoot.

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index.html<!DOCTYPE html>
<html lang="en">
  <head>
    <title>Custom map element</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=fetch,requestAnimationFrame,Element.prototype.classList,URL"></script>
    <style>
      .map {
        width: 100%;
        height:400px;
      }
    </style>
  </head>
  <body>
    <ol-map id="map" class="map"></ol-map>
    <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 OSM from 'ol/source/OSM';

class OLComponent extends HTMLElement {

  constructor() {
    super();
    this.shadow = this.attachShadow({mode: 'open'});
    const link = document.createElement('link');
    link.setAttribute('rel', 'stylesheet');
    link.setAttribute('href', 'css/ol.css');
    this.shadow.appendChild(link);
    const style = document.createElement('style');
    style.innerText = `
      :host {
        display: block;
      }
    `;
    this.shadow.appendChild(style);
    const div = document.createElement('div');
    div.style.width = '100%';
    div.style.height = '100%';
    this.shadow.appendChild(div);

    this.map = new Map({
      target: div,
      layers: [
        new TileLayer({
          source: new OSM()
        })
      ],
      view: new View({
        center: [0, 0],
        zoom: 2
      })
    });

  }
}

customElements.define('ol-map', OLComponent);
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package.json{
  "name": "es2015-custom-element",
  "dependencies": {
    "ol": "6.3.1"
  },
  "devDependencies": {
    "parcel": "1.11.0"
  },
  "scripts": {
    "start": "parcel index.html",
    "build": "parcel build --experimental-scope-hoisting --public-url . index.html"
  }
}