在openlayer 6.4.3中创建集群-捕获到TypeError：this.source.loadFeatures不是函数

问题描述

我正在尝试使用OL 6.4.3创建集群。我的脚本是

var cluster_data = {
            "type": "Feature",'features': [
            {
              'type': 'Feature','geometry': {
                'type': 'Point','coordinates': [686213.47091037,1093486.3776117],},{
              'type': 'Feature','coordinates': [687067.04391223,1094462.7275206],'coordinates': [687214.60645801,1094362.868384],}

            ],};
var features = new Array(3);
 var source = new ol.layer.Vector({
          features: new ol.format.GeoJSON().readFeatures(cluster_data),});

var clusterSource = new ol.source.Cluster({
  distance: 40,source: source,});

var styleCache = {};
var clusters = new ol.layer.Vector({
  source: clusterSource,style: function (feature) {
    var size = feature.get('features').length;
    var style = styleCache[size];
    if (!style) {
      style = new Style({
        image: new CircleStyle({
          radius: 10,stroke: new Stroke({
            color: '#fff',}),fill: new Fill({
            color: '#3399CC',text: new Text({
          text: size.toString(),fill: new Fill({
            color: '#fff',});
      styleCache[size] = style;
    }
    return style;
  },});
map.addLayer(clusters);

我添加了其他3个Tile层 map.getLayers（）。extend（[bm，road，landmark]）; 并尝试在此之上添加集群。但是在添加群集时出现错误 Uncaught TypeError：this.source.loadFeatures不是函数。

添加图层后得到的地图是

解决方法

错误是因为

var source = new ol.layer.Vector({

应该是

var source = new ol.source.Vector({

同样，数据应该是要素之前的第一种类型

"type": "FeatureCollection",

如果您使用的是OpenLayers完整版 new Style new CircleStyle new Stroke new Fill和new Text 应该 new ol.style.Style new ol.style.Circle new ol.style.Stroke new ol.style.Fill和new ol.style.Text

<!DOCTYPE html>
<html>
  <head>
    <link rel="stylesheet" href="https://openlayers.org/en/v6.4.3/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>
    <script src="https://openlayers.org/en/v6.4.3/build/ol.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.6.1/proj4.js"></script>
    <style>
      html,body,.map {
        margin: 0;
        padding: 0;
        width: 100%;
        height: 100%;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script>

proj4.defs("EPSG:32643","+proj=utm +zone=43 +datum=WGS84 +units=m +no_defs");
ol.proj.proj4.register(proj4);

var cluster_data = {
          "type": "FeatureCollection",'features': [
            {
              'type': 'Feature','geometry': {
                'type': 'Point','coordinates': [686213.47091037,1093486.3776117],},{
              'type': 'Feature','coordinates': [687067.04391223,1094462.7275206],'coordinates': [687214.60645801,1094362.868384],}

            ],};

var source = new ol.source.Vector({
          features: new ol.format.GeoJSON().readFeatures(cluster_data),});

var clusterSource = new ol.source.Cluster({
  distance: 40,source: source,});

var styleCache = {};
var clusters = new ol.layer.Vector({
  source: clusterSource,style: function (feature) {
    var size = feature.get('features').length;
    var style = styleCache[size];
    if (!style) {
      style = new ol.style.Style({
        image: new ol.style.Circle({
          radius: 10,stroke: new ol.style.Stroke({
            color: '#fff',}),fill: new ol.style.Fill({
            color: '#3399CC',text: new ol.style.Text({
          text: size.toString(),fill: new ol.style.Fill({
            color: '#fff',});
      styleCache[size] = style;
    }
    return style;
  },});

var map = new ol.Map({
  target: 'map',layers: [
    new ol.layer.Tile({
      source: new ol.source.OSM()
    })
  ],view: new ol.View({
    projection: "EPSG:32643"
  })
});

map.addLayer(clusters);

map.getView().fit(source.getExtent());
map.getView().setZoom(map.getView().getZoom() - 6);

    </script>
  </body>
</html>

cluster-analysis openlayers openlayers-3 openlayers-6

在openlayer 6.4.3中创建集群-捕获到TypeError：this.source.loadFeatures不是函数

问题描述

解决方法

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