原文链接及内容

运行界面

这个例子创建并注册了一个自定义元素ol-map,并为它引入了一幅简单的地图。注意:仅适用于支持ShadowRoot的浏览器。

注:关于ShadowRoot的内容请参见MDN的解释:https://developer.mozilla.org/zh-CN/docs/Web/API/ShadowRoot ,以及掘金上一篇不错的博客能够更通俗地进行了讲解:https://juejin.cn/post/7137112423613333541

main.js代码如下:

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import Map from 'ol/Map.js';
import OSM from 'ol/source/OSM.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';

class OLComponent extends HTMLElement {
constructor() {
super();
this.shadow = this.attachShadow({mode: 'open'});
const link = document.createElement('link');
link.setAttribute('rel', 'stylesheet');
link.setAttribute('href', 'theme/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);

界面布局文件index.html代码如下:

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Custom map element</title>
<link rel="stylesheet" href="node_modules/ol/ol.css">
<style>
.map {
width: 100%;
height: 400px;
}
</style>
</head>
<body>
<ol-map id="map" class="map"></ol-map>
<!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
<script src="https://cdn.jsdelivr.net/npm/elm-pep@1.0.6/dist/elm-pep.js"></script>
<script type="module" src="main.js"></script>
</body>
</html>