原文链接及内容

原文链接：https://openlayers.org/en/latest/examples/popup.html

运行界面

点击地图得到一个弹出窗口。这个弹出窗口由几个基本元素组成:一个容器、一个关闭按钮和一个放置内容的位置。为了将弹出窗口锚定在地图上，我们用弹出窗口容器创建了一个ol/Overlay。为地图的click事件注册一个侦听器以显示弹出窗口，将另一个侦听器设置为close按钮的click处理程序以隐藏弹出窗口。

main.js代码如下：

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import Map from 'ol/Map.js';
import Overlay from 'ol/Overlay.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';
import XYZ from 'ol/source/XYZ.js';
import {toLonLat} from 'ol/proj.js';
import {toStringHDMS} from 'ol/coordinate.js';

/**
 * Elements that make up the popup.
 */
const container = document.getElementById('popup');
const content = document.getElementById('popup-content');
const closer = document.getElementById('popup-closer');

/**
 * Create an overlay to anchor the popup to the map.
 */
const overlay = new Overlay({
  element: container,
  autoPan: {
    animation: {
      duration: 250,
    },
  },
});

/**
 * Add a click handler to hide the popup.
 * @return {boolean} Don't follow the href.
 */
closer.onclick = function () {
  overlay.setPosition(undefined);
  closer.blur();
  return false;
};

const key = 'Get your own API key at https://www.maptiler.com/cloud/';
const attributions =
  '<a href="https://www.maptiler.com/copyright/" target="_blank">&copy; MapTiler</a> ' +
  '<a href="https://www.openstreetmap.org/copyright" target="_blank">&copy; OpenStreetMap contributors</a>';

/**
 * Create the map.
 */
const map = new Map({
  layers: [
    new TileLayer({
      source: new XYZ({
        attributions: attributions,
        url: 'https://api.maptiler.com/maps/streets/{z}/{x}/{y}.png?key=' + key,
        tileSize: 512,
      }),
    }),
  ],
  overlays: [overlay],
  target: 'map',
  view: new View({
    center: [0, 0],
    zoom: 2,
  }),
});

/**
 * Add a click handler to the map to render the popup.
 */
map.on('singleclick', function (evt) {
  const coordinate = evt.coordinate;
  const hdms = toStringHDMS(toLonLat(coordinate));

  content.innerHTML = '<p>You clicked here:</p><code>' + hdms + '</code>';
  overlay.setPosition(coordinate);
});

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>Popup</title>
    <link rel="stylesheet" href="node_modules/ol/ol.css">
    <style>
      .map {
        width: 100%;
        height: 400px;
      }
      .ol-popup {
        position: absolute;
        background-color: white;
        box-shadow: 0 1px 4px rgba(0,0,0,0.2);
        padding: 15px;
        border-radius: 10px;
        border: 1px solid #cccccc;
        bottom: 12px;
        left: -50px;
        min-width: 280px;
      }
      .ol-popup:after, .ol-popup:before {
        top: 100%;
        border: solid transparent;
        content: " ";
        height: 0;
        width: 0;
        position: absolute;
        pointer-events: none;
      }
      .ol-popup:after {
        border-top-color: white;
        border-width: 10px;
        left: 48px;
        margin-left: -10px;
      }
      .ol-popup:before {
        border-top-color: #cccccc;
        border-width: 11px;
        left: 48px;
        margin-left: -11px;
      }
      .ol-popup-closer {
        text-decoration: none;
        position: absolute;
        top: 2px;
        right: 8px;
      }
      .ol-popup-closer:after {
        content: "✖";
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <div id="popup" class="ol-popup">
      <a href="#" id="popup-closer" class="ol-popup-closer"></a>
      <div id="popup-content"></div>
    </div>
    <!-- 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>