我想练习来自 openlayers.org 的地理定位示例。 在此示例中，用户的位置显示在 map 上。 map 是OSM。 在此示例中，导入了 OpenLayer 库。但我想使用脚本标签。并且无需添加库即可完成此操作。我改变了代码。但是用户的位置没有显示。我更改的代码有什么问题？示例中显示了以下代码以及我更改的代码。结果如图所示。
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>
altitude : <code id="altitude"></code>
altitude accuracy : <code id="altitudeAccuracy"></code>
heading : <code id="heading"></code>
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>
position accuracy : <code id="accuracy"></code>
altitude : <code id="altitude"></code>
altitude accuracy : <code id="altitudeAccuracy"></code>
heading : <code id="heading"></code>
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>
最佳答案
您更新代码时出现语法错误:
第 92 行:
Uncaught ReferenceError :未定义样式(应为ol.style.Style)第 113 行:
<未捕获类型错误:ol.source.VectorSource 不是构造函数(应为ol.source.Vector)
然后它就可以工作了(只要它位于我的本地计算机或安全的 [https:] 服务器上)。
<!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>
position accuracy : <code id="accuracy"></code>
altitude : <code id="altitude"></code>
altitude accuracy : <code id="altitudeAccuracy"></code>
heading : <code id="heading"></code>
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>关于使用 openlayer 示例进行地理定位的 Javascript 代码，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/54846057/