在服务器端渲染中反应传单地图错误

Question

已解决 --- 请阅读更新 2

你好，我在使用 React-leaflet 地图的 React 入门套件中遇到此错误

它就像 github 模块示例，但我不知道问题是什么！我认为SSR有问题

React 版本：16.x 和 React 入门套件

更新1

ReferenceError: window is not defined
    at D:\project\react-starterkit\node_modules\leaflet\src\core\Util.js:217:24
    at version (D:\project\react-starterkit\node_modules\leaflet\dist\leaflet-src.js:7:65)
    at Object.<anonymous> (D:\project\react-starterkit\node_modules\leaflet\dist\leaflet-src.js:10:2)
    at Module._compile (module.js:635:30)
    at Module._extensions..js (module.js:646:10)
    at Object.require.extensions.(anonymous function) [as .js] (D:\project\react-starterkit\node_modules\babel-register\lib\node.js:152:7)
    at Module.load (module.js:554:32)
    at tryModuleLoad (module.js:497:12)
    at Function.Module._load (module.js:489:3)
    at Module.require (module.js:579:17)

通过更新反应解决最新版本 16.x

TypeError: (0 , _react.createContext) is not a function
    at Object.<anonymous> (D:\project\react-starterkit\node_modules\react-leaflet\lib\context.js:18:47)
    at Module._compile (module.js:635:30)
    at Module._extensions..js (module.js:646:10)
    at Object.require.extensions.(anonymous function) [as .js] (D:\project\react-starterkit\node_modules\babel-register\lib\node.js:152:7)
    at Module.load (module.js:554:32)
    at tryModuleLoad (module.js:497:12)
    at Function.Module._load (module.js:489:3)
    at Module.require (module.js:579:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (D:\project\react-starterkit\node_modules\react-leaflet\lib\index.js:5:16)

这是我的代码：

import React from 'react';
import { Map, TileLayer, Marker, Popup } from 'react-leaflet';
import withStyles from 'isomorphic-style-loader/lib/withStyles';
import s from './Home.css';

class Home extends React.Component {
  constructor(props){
    super(props);
    this.state = {
      lat: 51.505,
      lng: -0.09,
      zoom: 13,
    }
  }
  render() {
    const position = [this.state.lat, this.state.lng]
    return (
      <Map center={position} zoom={this.state.zoom}>
        <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"
        />
        <Marker position={position}>
          <Popup>
            A pretty CSS3 popup. <br /> Easily customizable.
          </Popup>
        </Marker>
      </Map>
    );
  }
}

export default withStyles(s)(Home);

UPDATE 2 我自己解决了

import React from 'react';
import withStyles from 'isomorphic-style-loader/lib/withStyles';
import leafletCss from '!isomorphic-style-loader!css-loader?modules=false!leaflet/dist/leaflet.css'; //if use isomorphic-style-loader
import s from './GenerateMap.css';

let RL = false;
let Map = false;
let TileLayer = false;
let Marker = false;
let Popup = false;
if (process.env.BROWSER) {
  RL = require('react-leaflet');
  Map = RL.Map;
  TileLayer = RL.TileLayer;
  Marker = RL.Marker;
  Popup = RL.Popup;
}

class GenerateMap extends React.Component {
  render() {
    const position = [51.505, -0.09]

    return (
      <div className={s.root}>
        {process.env.BROWSER && (
          <Map style={{width:'100%',height: '500px'}} center={position} zoom={13}>
            <TileLayer
              url="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png"
              attribution="&copy; <a href=&quot;http://osm.org/copyright&quot;>OpenStreetMap</a> contributors"
            />
            <Marker position={position} icon=''>
              <Popup>A pretty CSS3 popup.<br />Easily customizable.</Popup>
            </Marker>
          </Map>
        )}
      </div>
    );
  }
}

export default withStyles(s, leafletCss)(GenerateMap);

Answer 1

从堆栈跟踪中，我看到react-leaflet正在使用createContext()React Context API 的一部分。这仅在React 16.3中可用。

您检查过您正在使用的版本吗？react-leaflet您可能使用依赖于 React 16.3 的版本。您可以尝试降级到react-leaflet1.9.1，看看是否有效。

Updated answer:

window is not defined is an error that most likely happened when your code is trying to access the global variable window which is only defined when your code run in browser (not SSR). Check your code to see if that error happened because of your code. If it is caused by react-leaflet, read below...

After more searching, it seems that react-leaflet isn't built with server side rendering in mind. You could try checking react-leaflet-universal to implement it. If all else fail, you might need to build your own wrapper for leaflet to achieve this.