原文链接及内容

原文链接：https://openlayers.org/en/latest/examples/mouse-position.html

运行界面

位于地图外部的鼠标位置控件的示例。

main.js代码如下：

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import Map from 'ol/Map.js';
import MousePosition from 'ol/control/MousePosition.js';
import OSM from 'ol/source/OSM.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';
import {createStringXY} from 'ol/coordinate.js';
import {defaults as defaultControls} from 'ol/control.js';

const mousePositionControl = new MousePosition({
  coordinateFormat: createStringXY(4),
  projection: 'EPSG:4326',
  // comment the following two lines to have the mouse position
  // be placed within the map.
  className: 'custom-mouse-position',
  target: document.getElementById('mouse-position'),
});

const map = new Map({
  controls: defaultControls().extend([mousePositionControl]),
  layers: [
    new TileLayer({
      source: new OSM(),
    }),
  ],
  target: 'map',
  view: new View({
    center: [0, 0],
    zoom: 2,
  }),
});

const projectionSelect = document.getElementById('projection');
projectionSelect.addEventListener('change', function (event) {
  mousePositionControl.setProjection(event.target.value);
});

const precisionInput = document.getElementById('precision');
precisionInput.addEventListener('change', function (event) {
  const format = createStringXY(event.target.valueAsNumber);
  mousePositionControl.setCoordinateFormat(format);
});

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>Mouse Position</title>
    <link rel="stylesheet" href="node_modules/ol/ol.css">
    <style>
      .map {
        width: 100%;
        height: 400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <div id="mouse-position"></div>
    <form>
      <label for="projection">Projection </label>
      <select id="projection">
        <option value="EPSG:4326">EPSG:4326</option>
        <option value="EPSG:3857">EPSG:3857</option>
      </select>
      <label for="precision">Precision</label>
      <input id="precision" type="number" min="0" max="12" value="4"/>
    </form>
    <!-- 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>