react-leaflet：如何根据geojson设置缩放

时间：2016-11-06 16:13:00

标签： javascript reactjs leaflet react-leaflet

我正在使用react-leaflet，到目前为止我的地图显示正常。我还成功地使用<GeoJson>来覆盖多边形。

我目前已经对我的中心和缩放值进行了硬编码，但我希望设置默认缩放，以便可以看到整个GeoJSON多边形。我正在努力学习我在网上找到的文档/答案（我只是初学者/中级JS）。

这是我的组件：

import React from 'react';
import { StyleSheet, css } from 'aphrodite/no-important';
import L from 'leaflet';
import { Map, TileLayer, Marker, Popup, GeoJson } from 'react-leaflet';
import axios from 'axios';

const styles = StyleSheet.create({
  map: {
    height: 240,
    width: '100%'
  }
});

const geodatas = { "type": "Polygon", "coordinates": [ [ [ 0.901409326032148, 51.87846074983652 ], [ 0.900728205963941, 51.87844428860128 ], [ 0.899345524616457, 51.8784325381963 ], [ 0.898758899468915, 51.878417331772674 ], [ 0.898382518544509, 51.87839424237513 ], [ 0.897325195329164, 51.878223304667991 ], [ 0.89594922021314, 51.877976588301692 ], [ 0.894955640203439, 51.877846407999037 ], [ 0.894280316390969, 51.877785709788448 ], [ 0.893320356777677, 51.877703150758911 ], [ 0.892628493048771, 51.877632959777358 ], [ 0.892139172447305, 51.877548791413972 ], [ 0.891852225577892, 51.877468544876464 ], [ 0.891748332612011, 51.877548514557468 ], [ 0.891456640213901, 51.877849701135801 ], [ 0.891291905863462, 51.878157745192553 ], [ 0.891212527716225, 51.878460992695949 ], [ 0.891079390830871, 51.879306113637384 ], [ 0.891068489722895, 51.879386403461886 ], [ 0.890532814748409, 51.879394179295069 ], [ 0.890012032842571, 51.879477202674821 ], [ 0.889375209183071, 51.879561187317655 ], [ 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class MapHolder extends React.Component {
  constructor() {
    super();
    this.state = {
      geodatas: geodatas,
      lat: 51.881403,
      lng: 0.918583,
      zoom: 17,
    };
  }


  render() {
const accessToken = 'pk.eyJ1IjoiZ2F6YXN0b24iLCJhIjoiY2loa21hNzRoMG50eHQ0bHp2azNpeHhwaiJ9.h81FekBCVUufbqxc9ywySQ'
const position = [this.state.lat, this.state.lng];

console.log(this.refs.geojson);
console.log(this.refs.foo.leafletElement);

this.refs.foo.leafletElement.fitBounds(this.refs.geojson.getBounds());

return (
  <div>
    <Map ref="foo" style={{height: "260px"}} center={position} zoom={this.state.zoom} scrollWheelZoom={false} >
    <TileLayer
      attribution='&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
      url={`https://api.mapbox.com/styles/v1/gazaston/cihkojpjh00whrom498ghjoc5/tiles/256/{z}/{x}/{y}?access_token=${accessToken}`}
      id='gazaston.o9phia6g'
      detectRetina={true}
    />
    <GeoJson ref="geojson" data={this.state.geodatas} />
  </Map>
  </div>
);

}

export default MapHolder;

更新

当我使用React dev工具时，选择我的<MapHolder>组件，切换到控制台，然后运行

$r.refs.foo.leafletElement.fitBounds($r.refs.geojson.leafletElement.getBounds());

一切都按预期工作。但是，在我的代码中

this.refs.foo.leafletElement.fitBounds(this.refs.geojson.leafletElement.getBounds());

返回Uncaught TypeError: Cannot read property 'leafletElement' of undefined

我太近了！我错过了什么？

3 个答案:

答案 0 :(得分：0)

基于@IvanSanchez的回复以及react-leaflet如何工作我建议先为你的GeoJson图层添加一个参考

 <GeoJson  ref="geojson" data={this.state.geodatas} />

然后使用其参考

访问地图 
this.refs.foo.leafletElement.fitBounds(this.refs.geojson.leafletElement.getBounds())

答案 1 :(得分：0)

由于react-leaflet处理其lifecycle的方式，它在安装Map组件后立即将控件转换为传单，因此访问子组件引用可能很棘手。

我用两种方式解决了这个问题。

我的第一次尝试涉及存储在我的外部组件状态中添加的功能的数量，如上所述附加layeradd的地图对象事件处理程序，然后在所有多边形都被访问后访问Geojson ref。加入。

```

componentDidMount() {
   let count = 0;
   const map = this.refs.map.leafletElement;
   map.on('layeradd', () => {
       count += 1;
       if (count > this.state.polygonCount) {
            setTimeout(()=>{DO STUFF}, 200)
        }
   });
}

```

虽然这有效，但它闻起来有点味道。

我解决这个问题的第二种方法是使用turf-bbox预先计算geojson的边界，然后我将其传递给我的render方法中的Map对象。

```

const bboxArray = bbox(geojson);
const corner1 = [bboxArray[1], bboxArray[0]];
const corner2 = [bboxArray[3], bboxArray[2]];
this.state.bounds = [corner1, corner2];

```

然后

```

 <Map bounds={this.state.bounds} ref="map">

```

如果您不需要使用GeoJSON leafletElement做更多的事情，第二种方法会更清晰，但第一种方法是让您设置任意数量的事件处理程序等。

答案 2 :(得分：0)

看起来像你一样99％的方式！为了将来的读者的利益，您可以逃避挥之不去的未捕获类型错误：

Uncaught TypeError: Cannot read property 'leafletElement' of undefined

...在检查中包含fitBounds方法调用以确保this.refs.foo，this.refs.geojson和朋友存在：

if (this.refs.foo && this.refs.foo.leafletElement && this.refs.geojson && this.refs.geojson.leafletElement) {
    this.refs.foo.leafletElement.fitBounds(this.refs.geojson.leafletElement.getBounds());
}

当前实现抛出错误的原因是，在调用render方法一次之前，不会设置map和GeoJSON refs。这意味着this.refs.foo和this.refs.geojson在第一次调用render方法时无法设置。

您还可以考虑将整个fitBounds操作移出渲染方法并移至componentWillReceiveProps;如果geodata可能通过发送到地图组件的道具动态更新，那么这将特别值得。

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