react-leaflet <GeoJSON /> pointToLayer 选项改变图标

Question

我目前正在尝试学习反应，我想使用传单图（react-leaflet）。

我有两个（点，多边形）GeoJson 对象我想显示，这是工作，但我想替换默认标记图标。

传单文档 http://leafletjs.com/examples/geojson/ 告诉我使用 pointToLayer 选项。

代码：

onEachFeaturePoint、onEachfeaturePolygon、pointToLayer

onEachFeaturePoint(feature, layer) {
  console.log('feature: ', feature);
  console.log('layer: ', layer);
  layer.on({
    'click': function (e) {
       console.log('e: ', e);
       console.log('click');
     }
  })
}

onEachFeaturePolygon(feature, layer) {
  console.log('feature: ', feature);
  console.log('layer: ', layer);
  layer.on({
    'click': function (e) {
       console.log('e: ', e);
       console.log('click');
     }
  })
}

pointToLayer(feature, latlng) {
  console.log('--- Point to layer');
  console.log('feature: ', feature);
  console.log('latlng: ', latlng);
  return <CircleMarker center={latlng} />;
}

渲染

render() {
  const center = [9.4921875, 51.83577752045248];

  return (
    <Map center={center} zoom={1}>
      <GeoJSON ref='marker1' data={this.state.point} onEachFeature={this.onEachFeaturePoint.bind(this)} pointToLayer={this.pointToLayer.bind(this)} />
      <GeoJSON ref='polygon1' data={this.state.polygon} onEachFeature={this.onEachFeaturePolygon.bind(this)} />
    </Map>
  )
}

如果我保留 pointToLayer={this.pointToLayer.bind(this)} 它会停止工作并出现以下错误：

Uncaught TypeError: layer.on is not a function
    at CustomMarker.onEachFeaturePoint (MapDemo.js:73)
    at NewClass.addData (leaflet-src.js:10455)
    at NewClass.addData (leaflet-src.js:10435)
    at NewClass.initialize (leaflet-src.js:10420)
    at new NewClass (leaflet-src.js:310)
    at L.geoJSON (leaflet-src.js:10732)

我无法弄清楚为什么会出现错误，也许有人知道如何解决这个问题或帮助我理解我犯的错误。

编辑： 通过在 pointToLayer 函数中用 return L.circleMarker() 替换 return <CirleMarker />，我让它工作了。

Answer 1

如果您只是想显示自定义图标，我认为您最好尝试使用 Marker 组件而不是 GeoJSON 组件。

<Map center={center} zoom={1}>
  <Marker
    icon={homeIcon}
    key='marker1'
    onClick={this._handleClick}
    position={leafletLatLng}
    />
</Map>

...

const homeIconUrl = 'home-2.png'
const homeIcon = icon({
  iconUrl: homeIconUrl,
  iconSize: [32, 37],
  iconAnchor: [16, 37]
})

Answer 2

通过在 pointToLayer 函数中用 return L.circleMarker() 替换 return <CirleMarker />，我让它工作了。

import L from 'leaflet';

...

pointToLayer(feature, latlng) {
   return L.circleMarker(latlng, null); // Change marker to circle
   // return L.marker(latlng, { icon: {}}); // Change the icon to a custom icon
}

react-leaflet <GeoJSON /> pointToLayer 选项改变图标

react-leaflet <GeoJSON /> pointToLayer option to change the icon

react-leaflet