leaflet-webpack Starter series five map shutter (with source code download)

Foreword

leaflet-webpack Starter series of environmental knowledge to understand:

• node installation package download
  webpack package management tools need to rely node environment, so node installation package must be installed above link is the official website Download
• webpack configuration document describes
  in detail the configuration of webpack document describes, for beginners to see, I also watched and learned
  
• vscode download the installation package , I am here with vscode compiler front-end development tools project, this tool personally feel pretty good
• leaflet api document describes , in detail leaflet each class functions and properties, etc.
• Examples leaflet online
• Plug leaflet , leaflet plug-in library, very useful

At a Glance

leaflet map shutter
source code demo download

The effect is as follows:

effects demo of relatively simple, direct use github leaflet is the official map shutter Plug: leaflet-Side-by-Side , the plug-in with time, if the left and right sides of the base map with a case, only a show, not Does this count as a know bug

Step demo integrated plug of the following:

• npm command to install the leaflet-side-by-side plug-in library

npm i leaflet-side-by-side --save

• Reference leaflet-side-by-side to come

import "leaflet-side-by-side";

• Complete the core code is as follows:

import L from 'leaflet';
import 'leaflet/dist/leaflet.css';
import "leaflet-side-by-side";
import config from "./config";
 
let userconfig = {};
//左侧地图
const map = L.map("Map", {
attributionControl: false
}).setView(config.mapInitParams.center, config.mapInitParams.zoom);
//创建底图切换数据源
const baseLayer1 = L.tileLayer(config.baseMaps[0].Url,);//OSM街道图
const baseLayer2 = L.tileLayer(config.baseMaps[1].Url);//ArcGIS影像图
map.addLayer(baseLayer1);//左侧默认卷帘图层
map.addLayer(baseLayer2);//右侧默认卷帘图层
userconfig.leftLayers = [baseLayer1];
userconfig.rightLayers = [baseLayer2];
//卷帘地图效果
userconfig.sideBySide = L.control
.sideBySide(userconfig.leftLayers, userconfig.rightLayers)
.addTo(map);
//左侧下拉框改变事件
document.getElementById("selectLeftV").onchange =function(){
sideBySideChange();
}
//右侧下拉框改变事件
document.getElementById("selectRightV").onchange =function(){
sideBySideChange();
}
function sideBySideChange(){
//这个插件的左右两侧底图不能一样,否则同时只能显示一个,算是一个bug?
var leftvalue = document.getElementById("selectLeftV").value;
var rightvalue = document.getElementById("selectRightV").value;
var LeftLayer = leftvalue === "0" ? baseLayer1 : baseLayer2;
var RightLayer = rightvalue === "0" ? baseLayer2 : baseLayer1;
addLRLayers(LeftLayer,RightLayer);
userconfig.sideBySide.setLeftLayers(userconfig.leftLayers);
userconfig.sideBySide.setRightLayers(userconfig.rightLayers);
}
……

完整demo源码见小专栏文章尾部：GIS之家leaflet小专栏

文章尾部提供源代码下载，对本专栏感兴趣的话，可以关注一波