javascript - 使用 leaflet-react 时如何调用 fitBounds() ？

Question

我不知道如何在 Leaflet map 上调用 fitBounds()。

如果我只是使用普通传单，这个解决方案将完美工作:Zoom to fit all markers in Mapbox or Leaflet

不幸的是，我正在使用react-leaflet。

如果我只是单独使用传单，这是解决方案。

var leafletMap = new L.featureGroup([marker1, marker2, marker3]);
map.fitBounds(leafletMap.getBounds());

我认为这段代码(我的代码)this.mapRef.current.leafletElement相当于var leafletMap = new L.featureGroup([marker1, marker2, marker3]); leafletMap.getBounds();，但是map.fitBounds();相当于react-leaflet中的什么？

基本上，我试图在 map 上显示多个标记，并相应地调整 View (放大、缩小、飞向等)。

这是我的代码。

import React, { createRef, Component } from 'react'
import { Map, TileLayer, Marker, Popup, FeatureGroup } from 'react-leaflet'

export default class MasterLeafletMap extends Component {
  constructor(props) {
    super(props);
    this.markers = this.markers.bind(this);
    this.handleClick = this.handleClick.bind(this);
    this.mapRef = createRef()
  }

  handleClick() {
    const leafletMap = this.mapRef.current.leafletElement;
    this.mapRef.current.fitBounds(leafletMap.getBounds()); // Doesn't work
    leafletMap.fitBounds(leafletMap.getBounds()); // Doesn't work (just trying to get the bounds of the markers that are there and adjust the view)
    this.mapRef.current.leafletElement.flyToBounds(leafletMap.getBounds()); // Doesn't work
  }
  markers() {
    if (this.props.search.items instanceof Array) {
      return this.props.search.items.map(function(object, i) {
        const position = [object._geoloc.lat, object._geoloc.lng];
        return <Marker position={position}>
          <Popup>
            <span>
              <h4>{object.title}</h4>
              {object.address}, <br /> {object.city}, {object.state}, {object.zip} <br /> {object._geoloc.lat}, {object._geoloc.lng}
            </span>
          </Popup>
        </Marker>
      })
    }

  }
  render() {
    const hasLoaded = this.props.search.items instanceof Array;
    if (!hasLoaded) {
      return null;
    }

    const position = [this.props.search.items[0]._geoloc.lat, this.props.search.items[0]._geoloc.lng];

    return (
      <div className="leaflet-map-container">
        <div onClick={this.handleClick}>Hello</div>
        <Map center={position} zoom={13} ref={this.mapRef}>
          <TileLayer
            attribution="&amp;copy <a href=&quot;http://osm.org/copyright&quot;>OpenStreetMap</a> contributors"
            url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
          />
          <FeatureGroup>
            {this.markers()}
          </FeatureGroup>
        </Map>
      </div>
    )
  }
}

提前致谢。

Answer 1

以下是如何通过 react-leaflet 完成此操作的示例

handleClick() {
    const map = this.mapRef.current.leafletElement;  //get native Map instance
    const group = this.groupRef.current.leafletElement; //get native featureGroup instance
    map.fitBounds(group.getBounds());
}

哪里

<div>
    <button onClick={this.handleClick}>Zoom</button>
    <Map
      center={this.props.center}
      zoom={this.props.zoom}
      ref={this.mapRef}
    >
      <TileLayer
        attribution='&amp;copy <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
        url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
      />
      <FeatureGroup ref={this.groupRef}>
        {this.props.locations.map(location => (
          <Marker
            key={location.name}
            position={{ lat: location.lat, lng: location.lng }}
          >
            <Popup>
              <span>
                <h4>{location.name}</h4>
              </span>
            </Popup>
          </Marker>
        ))}
      </FeatureGroup>
    </Map>
 </div>

对应于

var leafletMap = new L.featureGroup([marker1, marker2, marker3]);
map.fitBounds(leafletMap.getBounds());

Here is a demo