如何在geojson层中手动控制react-leaflet弹出窗口（通过props）？

Question

我正在使用 React-leaflet 渲染包含点和线串的 geojson 要素集合：

我能够让实际功能本身的单击和悬停事件正常工作。但我希望能够将鼠标悬停在列表项（与地图上的项目相关）上并打开弹出窗口。我一直在整理文档、github，并尝试不同的东西。但似乎没有办法做到这一点。或者我必须手动渲染我的线串和点，而不是使用<GeoJSON data=

我的地图与点击事件配合得很好：

return (
        <Map
            style={{
                height: '100%',
                width: '100%',
                margin: '0 auto'
            }}
            ref={(el) => {
                this.leafletMap = el;
            }}
            center={position}
            zoom={10}>
            <TileLayer url='https://api.mapbox.com/v4/mapbox.outdoors/{z}/{x}/{y}@2x.png?access_token=pk.eyJ1IjoiYWJlbnMwefwefEiOiJjajJ1bDRtMzcwMDssmMzJydHdvcjF6ODA5In0.xdZi4pmkhj1zb9Krr64CXw' attribution='&copy; <a href="https://www.mapbox.com/about/maps/">Mapbox</a>' />
            <GeoJSON data={locations} onEachFeature={this.onEachFeature} />{' '}
        </Map>
    );

onEachFeature 正常工作

onEachFeature = (feature, layer) => {
        console.log('onEachFeature fired: ');
        layer.on({
            mouseover: (e) => this.MouseOverFeature(e, feature),
            mouseout: (e) => this.MouseOutFeature(e, feature)

        });
    };

但我不知道如何在不使用的情况下调用layer.bindPopup onEachFeature。一项更改如何使用 prop 值调用这些方法？我想让人们将鼠标悬停在列表项上并让它切换弹出窗口。

Answer 1

您可以考虑扩展 GeoJSON组件，例如：

const GeoJSONWithLayer = props => {
  const handleOnEachFeature = (feature, layer) => {
    let popupContent = "";
    if (props.popupContent.length) popupContent = props.popupContent;
    else if (feature.properties && feature.properties.popupContent) {
      popupContent = feature.properties.popupContent;
    }

    layer.bindPopup(popupContent);
    layer.on({
      mouseover: e => {
        layer.openPopup();
      },
      mouseout: e => {
        layer.closePopup();
      }
    });
  };
  return <GeoJSON {...props} onEachFeature={handleOnEachFeature} />;
}


GeoJSONWithLayer.defaultProps = {
  popupContent: '',
}

它支持传递额外的属性和默认属性，并包含图层的弹出绑定逻辑。现在它可以像这样使用：

const MapExample = props => {
  const style = () => ({
    color: "green",
    weight: 20
  });

  const freeBus = {
    type: "FeatureCollection",
    features: [
      {
        type: "Feature",
        geometry: {
          type: "LineString",
          coordinates: [
            [-105.00341892242432, 39.75383843460583],
            [-105.0008225440979, 39.751891803969535],
            [-104.99820470809937, 39.74979664004068],
            [-104.98689651489258, 39.741052354709055]
          ]
        },
        properties: {
          popupContent:
            "This is a free bus line that will take you across downtown.",
          underConstruction: false
        },
        id: 1
      }
    ]
  };

  return (
    <Map zoom={14} center={{ lat: 39.74739, lng: -105 }}>
      <TileLayer url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png" />
      <GeoJSONWithLayer
        popupContent={"Some content goes here..."}
        data={freeBus}
        style={style}
      />
    </Map>
  );
};