原文链接及内容

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

运行界面

此示例显示如何向地图添加缩放滑块以及如何对其进行自定义样式。

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';
import {ZoomSlider} from 'ol/control.js';

/**
 * Helper method for map-creation.
 *
 * @param {string} divId The id of the div for the map.
 * @return {Map} The map instance.
 */
function createMap(divId) {
  const source = new OSM();
  const layer = new TileLayer({
    source: source,
  });
  const map = new Map({
    layers: [layer],
    target: divId,
    view: new View({
      center: [0, 0],
      zoom: 2,
    }),
  });
  const zoomslider = new ZoomSlider();
  map.addControl(zoomslider);
  return map;
}

const map1 = createMap('map1');
const map2 = createMap('map2');
const map3 = createMap('map3');

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>Zoom Sliders</title>
    <link rel="stylesheet" href="node_modules/ol/ol.css">
    <style>
      .map {
        width: 100%;
        height: 400px;
      }
      /**
       * The zoomslider in the second map shall be placed between the zoom-in and
       * zoom-out buttons.
       */
      #map2 .ol-zoom .ol-zoom-out {
        margin-top: 200px;
      }
      #map2 .ol-zoomslider {
        background-color: transparent;
        /*
        Zoom control top: 0.5em
        Zoom control padding: 2px
        Zoom in button margin top: 1px
        Zoom in button height: font size 1.14em * 1.375 height
        */
        top: calc(0.5em + 2px + 1px + 1.14 * 1.375em);
      }

      #map2 .ol-touch .ol-zoom .ol-zoom-out {
        margin-top: 212px;
      }
      #map2 .ol-touch .ol-zoomslider {
        top: 2.75em;
      }

      #map2 .ol-zoom-in.ol-has-tooltip:hover [role=tooltip],
      #map2 .ol-zoom-in.ol-has-tooltip:focus [role=tooltip] {
        top: 3px;
      }

      #map2 .ol-zoom-out.ol-has-tooltip:hover [role=tooltip],
      #map2 .ol-zoom-out.ol-has-tooltip:focus [role=tooltip] {
        top: 232px;
      }

      /**
       * The zoomslider in the third map shall be horizontal, placed in the top-right
       * corner, smaller and orange.
       */
      #map3 .ol-zoomslider {
        top: 8px;
        left: auto;
        right: 8px;
        background-color: rgba(255,69,0,0.2);
        width: 200px;
        height: 15px;
        padding: 0;
        box-shadow: 0 0 5px rgb(255,69,0);
        border-radius: 7.5px;
      }

      #map3 .ol-zoomslider:hover {
        background-color: rgba(255,69,0,0.3);
      }

      #map3 .ol-zoomslider-thumb {
        height: 15px;
        width: 15px;
        margin: 0;
        filter: none;
        background-color: rgba(255,69,0,0.6);
        border-radius: 7.5px;
      }
      #map3 a.ol-zoomslider-handle:hover {
        background-color: rgba(255,69,0,0.7);
      }
    </style>
  </head>
  <body>
    <h4>Default style</h4>
    <div id="map1" class="map"></div>

    <h4>Placed between zoom controls</h4>
    <div id="map2" class="map"></div>

    <h4>Horizontal and completely re-styled</h4>
    <div id="map3" class="map"></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>