react从头搭建工程和openlayer5结合创建可调式地图

fengzheng0603

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博客分类：

react
openlayer
debug

1. npm 命令

mkdir react-webpack-openlayer

cd react-webpack-openlayer

npm init

npm i react react-dom -D

npm i webpack webpack-cli webpack-dev-server  -D

npm i @babel/core babel-loader @babel/preset-env @babel/preset-react --save-dev

npm i css-loader style-loader

npm i ol

2.package.json

{
  "name": "react-webpack-openlayer",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "webpack-dev-server"
  },
  "author": "",
  "license": "ISC",
  "dependencies": {},
  "devDependencies": {
    "@babel/core": "^7.4.4",
    "@babel/preset-env": "^7.4.4",
    "@babel/preset-react": "^7.0.0",
    "babel-loader": "^8.0.6",
    "css-loader": "^2.1.1",
    "ol": "^5.3.2",
    "react": "^16.8.6",
    "react-dom": "^16.8.6",
    "style-loader": "^0.23.1",
    "webpack": "^4.31.0",
    "webpack-cli": "^3.3.2",
    "webpack-dev-server": "^3.3.1"
  }
}

3.webpack.config.js

const path = require('path')

module.exports = {
    devtool: "source-map",
    entry: {
        entry: './src/Main.js', 
    },
    output: {
        path: __dirname, 
        filename: 'index1.js'
    },
    resolve: {
        alias: {
            src: path.resolve(__dirname, 'src/')
        }
    },
    module: {
        rules: [
            {
                test: /\.js$/, 
                exclude: /node_modules/,
                loader: 'babel-loader'
            }, {
                test: /\.css$/,
                exclude: /node_modules/,
                use: [
                  'style-loader',
                  {
                    loader: 'css-loader',
                    options: {
                      modules: true,
                    },
                  },
                ],
            }
        ]
    },
    devServer: {
        inline: true,
        open: 'Chrome'
    }
}

4..babelrc

{
    "presets": ["@babel/preset-env", "@babel/preset-react"]
}

5.index.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Roles and Privileges</title>
    
</head>
<body style="background-color: #f9fafc; margin:0px;">
<div id="app"></div>
<script type="text/javascript" src="index1.js"></script>
</body>
</html>

6.Main.js

import React from 'react';
import ReactDOM from 'react-dom';
import App from './App';

ReactDOM.render(
    <App/>,
    document.getElementById('app')
  )

7.App.js

import React from 'react';
import Map from "./Map";


class App extends React.Component {

    render() {
        
        return  (<div>
           <Map />
        </div>
        
        )
    }
}

export default App

8.Map.js

import React, { Component } from "react";
import Map from 'ol/Map.js';
import View from 'ol/View.js';
import TileLayer from 'ol/layer/Tile.js';
import XYZ from 'ol/source/XYZ.js';
import OlSourceOSM from "ol/source/OSM";

class PublicMap extends Component {
    
    constructor(props) {
        super(props);
        
        let modelDistribution = require('./config/modelDistribution.json');
        this.mapConfig=modelDistribution.map

        this.initMap();

    }

    componentDidMount() {
        this.olmap.setTarget("map");  
    }

    initMap(){

        this.olmap = new Map({
            target: null,
            layers: [
            new TileLayer({
                source: new XYZ({
                        url: "https://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer/tile/{z}/{y}/{x}"
                    })
                })
            ],
            view: new View({
                projection: 'EPSG:4326',
                center:[-83.44, 42.60],
                zoom: 12
            })
        });
  }

    render() {
        return (
        <div id="map" style={{ width: "100%", height: "800px" }}>
        </div>
        );
    }
}

export default PublicMap;

9. 效果图：