Question

我想练习openlayers.org中的Geolocation示例。在此示例中，用户的位置显示在地图上。地图是OSM。在此示例中，导入了OpenLayer库。但是我想使用脚本标签。并且无需添加库即可执行此操作。我更改了密码。但是没有显示用户的位置。我更改的代码有什么问题？示例中显示了以下代码以及已更改的代码。结果在图片中。

开放层代码：

<!DOCTYPE html>
<html>
  <head>
    <title>Geolocation</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css">
    <!-- 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=requestAnimationFrame,Element.prototype.classList,URL"></script>

  </head>
  <body>
    <div id="map" class="map"></div>
    <div id="info" style="display: none;"></div>
    <label for="track">
      track position
      <input id="track" type="checkbox"/>
    </label>
    <p>
      position accuracy : <code id="accuracy"></code>&nbsp;&nbsp;
      altitude : <code id="altitude"></code>&nbsp;&nbsp;
      altitude accuracy : <code id="altitudeAccuracy"></code>&nbsp;&nbsp;
      heading : <code id="heading"></code>&nbsp;&nbsp;
      speed : <code id="speed"></code>
    </p>
    <script>
      import Feature from 'ol/Feature.js';
      import Geolocation from 'ol/Geolocation.js';
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import Point from 'ol/geom/Point.js';
      import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
      import {OSM, Vector as VectorSource} from 'ol/source.js';
      import {Circle as CircleStyle, Fill, Stroke, Style} from 'ol/style.js';

      var view = new View({
        center: [0, 0],
        zoom: 2
      });

      var map = new Map({
        layers: [
          new TileLayer({
            source: new OSM()
          })
        ],
        target: 'map',
        view: view
      });

      var geolocation = new Geolocation({
        // enableHighAccuracy must be set to true to have the heading value.
        trackingOptions: {
          enableHighAccuracy: true
        },
        projection: view.getProjection()
      });

      function el(id) {
        return document.getElementById(id);
      }

      el('track').addEventListener('change', function() {
        geolocation.setTracking(this.checked);
      });

      // update the HTML page when the position changes.
      geolocation.on('change', function() {
        el('accuracy').innerText = geolocation.getAccuracy() + ' [m]';
        el('altitude').innerText = geolocation.getAltitude() + ' [m]';
        el('altitudeAccuracy').innerText = geolocation.getAltitudeAccuracy() + ' [m]';
        el('heading').innerText = geolocation.getHeading() + ' [rad]';
        el('speed').innerText = geolocation.getSpeed() + ' [m/s]';
      });

      // handle geolocation error.
      geolocation.on('error', function(error) {
        var info = document.getElementById('info');
        info.innerHTML = error.message;
        info.style.display = '';
      });

      var accuracyFeature = new Feature();
      geolocation.on('change:accuracyGeometry', function() {
        accuracyFeature.setGeometry(geolocation.getAccuracyGeometry());
      });

      var positionFeature = new Feature();
      positionFeature.setStyle(new Style({
        image: new CircleStyle({
          radius: 6,
          fill: new Fill({
            color: '#3399CC'
          }),
          stroke: new Stroke({
            color: '#fff',
            width: 2
          })
        })
      }));

      geolocation.on('change:position', function() {
        var coordinates = geolocation.getPosition();
        positionFeature.setGeometry(coordinates ?
          new Point(coordinates) : null);
      });

      new VectorLayer({
        map: map,
        source: new VectorSource({
          features: [accuracyFeature, positionFeature]
        })
      });
    </script>
  </body>
</html>

结果 enter image description here

我的代码：

<!DOCTYPE html>
<html>
  <head>
    <title>Geolocation</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    
    <script src="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.3.0/build/ol.js"></script>
  </head>
  <body>
    <div id="map" class="map"></div>
    <div id="info" style="display: none;"></div>
    <label for="track">
      track position
      <input id="track" type="checkbox"/>
    </label>
    <p>
	positionshowingtouser: <code id="positionshowingtouser1"></code>&nbsp;&nbsp;
      position accuracy : <code id="accuracy"></code>&nbsp;&nbsp;
      altitude : <code id="altitude"></code>&nbsp;&nbsp;
      altitude accuracy : <code id="altitudeAccuracy"></code>&nbsp;&nbsp;
      heading : <code id="heading"></code>&nbsp;&nbsp;
      speed : <code id="speed"></code>
    </p>
	<button onclick="showPosition1()">Try It</button>

    <p id="demo"></p>
    <script>
      /*import Feature from 'ol/Feature.js';
      import Geolocation from 'ol/Geolocation.js';
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import Point from 'ol/geom/Point.js';
      import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
      import {OSM, Vector as VectorSource} from 'ol/source.js';
      import {Circle as CircleStyle, Fill, Stroke, Style} from 'ol/style.js';*/

      var view = new ol.View({
        center: ol.proj.fromLonLat([51.3, 35.6]),
          zoom: 10
      });

      var map = new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          })
        ],
        target: 'map',
        view: view
      });

      var geolocation = new ol.Geolocation({
        // enableHighAccuracy must be set to true to have the heading value.
        trackingOptions: {
          enableHighAccuracy: true
        },
        projection: view.getProjection()
      });

      function el(id) {
        return document.getElementById(id);
      }

      el('track').addEventListener('change', function() {
        geolocation.setTracking(this.checked);
      });

      // update the HTML page when the position changes.
      geolocation.on('change', function() {
	    el('positionshowingtouser1').innerText = geolocation.getPosition();
        el('accuracy').innerText = geolocation.getAccuracy() + ' [m]';
        el('altitude').innerText = geolocation.getAltitude() + ' [m]';
        el('altitudeAccuracy').innerText = geolocation.getAltitudeAccuracy() + ' [m]';
        el('heading').innerText = geolocation.getHeading() + ' [rad]';
        el('speed').innerText = geolocation.getSpeed() + ' [m/s]';
      });

      // handle geolocation error.
      geolocation.on('error', function(error) {
        var info = document.getElementById('info');
        info.innerHTML = error.message;
        info.style.display = '';
      });

      var accuracyFeature = new ol.Feature();
      geolocation.on('change:accuracyGeometry', function() {
        accuracyFeature.setGeometry(geolocation.getAccuracyGeometry());
      });

      var positionFeature = new ol.Feature();
      positionFeature.setStyle(new Style({
        image: new ol.style.Circle({
          radius: 6,
          fill: new ol.style.Fill({
            color: '#3399CC'
          }),
          stroke: new ol.style.Stroke({
            color: '#fff',
            width: 2
          })
        })
      }));

      geolocation.on('change:position', function() {
        var coordinates = geolocation.getPosition();
        positionFeature.setGeometry(coordinates ?
          new ol.geom.Point(coordinates) : null);
      });

      new ol.layer.Vector({
        map: map,
        source: new ol.source.VectorSource({
          features: [accuracyFeature, positionFeature]
        })
      });
	 
    </script>
  </body>
</html>

结果 enter image description here

Answer 1

更新代码时出现语法错误：

第92行：Uncaught ReferenceError: Style is not defined（应为ol.style.Style）
第113行：Uncaught TypeError: ol.source.VectorSource is not a constructor（应为ol.source.Vector）

然后它可以工作（只要它在我的本地计算机上或安全的[https：]服务器上）。

live version

<!DOCTYPE html>
<html>
  <head>
    <title>Geolocation</title>
    <link rel="stylesheet" href="https://openlayers.org/en/v5.3.0/css/ol.css" type="text/css">
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    
    <script src="https://cdn.rawgit.com/openlayers/openlayers.github.io/master/en/v5.3.0/build/ol.js"></script>
  </head>
  <body>
    <div id="map" class="map"></div>
    <div id="info" style="display: none;"></div>
    <label for="track">
      track position
      <input id="track" type="checkbox"/>
    </label>
    <p>
	positionshowingtouser: <code id="positionshowingtouser1"></code>&nbsp;&nbsp;
      position accuracy : <code id="accuracy"></code>&nbsp;&nbsp;
      altitude : <code id="altitude"></code>&nbsp;&nbsp;
      altitude accuracy : <code id="altitudeAccuracy"></code>&nbsp;&nbsp;
      heading : <code id="heading"></code>&nbsp;&nbsp;
      speed : <code id="speed"></code>
    </p>
	<button onclick="showPosition1()">Try It</button>

    <p id="demo"></p>
    <script>
      /*import Feature from 'ol/Feature.js';
      import Geolocation from 'ol/Geolocation.js';
      import Map from 'ol/Map.js';
      import View from 'ol/View.js';
      import Point from 'ol/geom/Point.js';
      import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer.js';
      import {OSM, Vector as VectorSource} from 'ol/source.js';
      import {Circle as CircleStyle, Fill, Stroke, Style} from 'ol/style.js';*/

      var view = new ol.View({
        center: ol.proj.fromLonLat([51.3, 35.6]),
          zoom: 10
      });

      var map = new ol.Map({
        layers: [
          new ol.layer.Tile({
            source: new ol.source.OSM()
          })
        ],
        target: 'map',
        view: view
      });

      var geolocation = new ol.Geolocation({
        // enableHighAccuracy must be set to true to have the heading value.
        trackingOptions: {
          enableHighAccuracy: true
        },
        projection: view.getProjection()
      });

      function el(id) {
        return document.getElementById(id);
      }

      el('track').addEventListener('change', function() {
        geolocation.setTracking(this.checked);
      });

      // update the HTML page when the position changes.
      geolocation.on('change', function() {
	    el('positionshowingtouser1').innerText = geolocation.getPosition();
        el('accuracy').innerText = geolocation.getAccuracy() + ' [m]';
        el('altitude').innerText = geolocation.getAltitude() + ' [m]';
        el('altitudeAccuracy').innerText = geolocation.getAltitudeAccuracy() + ' [m]';
        el('heading').innerText = geolocation.getHeading() + ' [rad]';
        el('speed').innerText = geolocation.getSpeed() + ' [m/s]';
      });

      // handle geolocation error.
      geolocation.on('error', function(error) {
        var info = document.getElementById('info');
        info.innerHTML = error.message;
        info.style.display = '';
      });

      var accuracyFeature = new ol.Feature();
      geolocation.on('change:accuracyGeometry', function() {
        accuracyFeature.setGeometry(geolocation.getAccuracyGeometry());
      });

      var positionFeature = new ol.Feature();
      positionFeature.setStyle(new ol.style.Style({
        image: new ol.style.Circle({
          radius: 6,
          fill: new ol.style.Fill({
            color: '#3399CC'
          }),
          stroke: new ol.style.Stroke({
            color: '#fff',
            width: 2
          })
        })
      }));

      geolocation.on('change:position', function() {
        var coordinates = geolocation.getPosition();
        positionFeature.setGeometry(coordinates ?
          new ol.geom.Point(coordinates) : null);
      });

      new ol.layer.Vector({
        map: map,
        source: new ol.source.Vector({
          features: [accuracyFeature, positionFeature]
        })
      });
	 
    </script>
  </body>
</html>

Answer 2

对于没有图书馆的地理位置，您可以使用def check(subtotal, item_quantity, item_product_price): if subtotal == (item_quantity * item_product_price): return "Y" else: return "N" validate = udf(check) orderitems = orderitems.withColumn("valid", validate("order_item_subtotal", "order_item_quantity", "order_item_product_price")) https://developer.mozilla.org/en-US/docs/Web/API/Geolocation/watchPosition

navigator.geolocation.watchPosition()

带有Openlayer示例的Geolocation Java代码

2 个答案: