Angular 2-外部传单字体库的导入

Question

我正试图将一个typescript传单库导入到我的angular 2应用程序中。

这是我的地图组件。我用tsd安装了leaflet.dts，我的应用程序没有抱怨/// <reference path="../../typings/leaflet/leaflet.d.ts"/>，但当我尝试使用leaflet.d.ts中导出的模块L.map时，我得到了错误"ReferenceError:L未定义"。这是我第一次尝试在angular 2中导入外部字体库，很明显我做错了什么。

/// <reference path="../../typings/leaflet/leaflet.d.ts"/>
import { Component } from 'angular2/core';
@Component({
  selector: 'map',
  template: `
        <div id="map"></div>
  `,
})
export class Map{
    constructor(){
          var map = new L.Map('map', {
             zoomControl: false
         });
    }

软件包.json

{
  "dependencies": {
    "angular2": "^2.0.0-beta.3",
    "es6-promise": "^3.0.2",
    "es6-shim": "^0.33.3",
    "normalize.css": "^3.0.3",
    "reflect-metadata": "0.1.2",
    "rxjs": "5.0.0-beta.2",
    "systemjs": "0.19.6",
    "typings": "^0.6.4",
    "zone.js": "^0.5.11"
  },
  "devDependencies": {
    "concurrently": "^1.0.0",
    "gh-pages": "^0.11.0",
    "grunt": "~0.4.5",
    "grunt-contrib-clean": "^1.0.0",
    "grunt-contrib-copy": "^1.0.0",
    "grunt-contrib-cssmin": "^1.0.0",
    "grunt-contrib-nodeunit": "~0.4.1",
    "grunt-contrib-sass": "~0.9.0",
    "grunt-contrib-uglify": "~0.5.0",
    "grunt-shell": "^1.2.1",
    "lite-server": "^2.0.1",
    "normalize.css": "^3.0.3",
    "typescript": "^1.7.5"
  },
  "scripts": {
    "publish": "node publish.js",
    "tsc": "tsc",
    "tsc:w": "tsc -w",
    "lite": "lite-server",
    "start": "concurrent "npm run tsc:w" "npm run lite" "
  }
}

tsd.json

{
  "version": "v4",
  "repo": "borisyankov/DefinitelyTyped",
  "ref": "master",
  "path": "typings",
  "bundle": "typings/tsd.d.ts",
  "installed": {
    "leaflet/leaflet.d.ts": {
      "commit": "1da639a106527e0c4010b354a1efe52a3059a291"
    }
  }
}

有人能告诉我我做错了什么吗？

谢谢！

Answer 1

您需要包含传单JS文件：

System.config({
  map: {
    leaflet: 'https://cdnjs.cloudflare.com/ajax/libs/leaflet/0.7.7/leaflet.js'
  },
  packages: {'app': {defaultExtension: 'ts'}} 
});
System.import('app/main')
        .then(null, console.error.bind(console));

然后你可以通过这种方式将其导入到你的模块中：

import {Component, OnInit} from 'angular2/core';
import leaflet from 'leaflet';

看到这个plunkr：http://plnkr.co/edit/aUo2uvlxC5ji32u01jfF?p=preview.

Answer 2

我可以建议您一个解决方法，直到angular cli更好地支持第三方libs。它对我有效：）

首先转到项目目录并键入

npm install leaflet --save

然后打开angular-cli-build.js并添加这行

vendorNpmFiles: [
   ..................
   'leaflet/**/*.js',
    ....................
  ]

现在打开你的src/system-config.ts，写

const map:any ={
     ..................
   'leaflet': 'vendor/leaflet/dist',
    ....................
}

和

const packages: any = {
  'leaflet': {
    format: 'cjs'
  }
};

打开你的src/index.html，添加这个

 <script type="text/javascript" src="vendor/leaflet/dist/leaflet.js"></script>

不要忘记添加css文件也

  <link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet/v0.7.7/leaflet.css" />

现在打开您想要使用传单的组件

declare let L: any;
@Component({
  moduleId: module.id,
  selector: 'app-map',
  templateUrl: 'map.component.html',
  styleUrls: ['map.component.css']
})
export class MapComponent implements OnInit, AfterViewInit {
 leafletMap: any;
 ngAfterViewInit() {
    this.leafletMap = L.map("map").setView([23.709921, 90.407143], 7);
 }
}

Tada！！您的地图已加载：D

Answer 3

为了让Thierry Templier的答案能够使用systemjs和Angular 2.4，我不得不做一些更改。

正如他所说，我在system.config.js文件中添加了传单，但在我的组件中，我不得不以这种方式导入：

import * as L from 'leaflet';

然后L类在我的MapComponent 中被识别

export class MapComponent {
    let map = L.map("map").setView([38, -77], 13);
            L.tileLayer('http://{s}.tile.osm.org/{z}/{x}/{y}.png', {
            attribution: '&copy; <a href="http://osm.org/copyright">OpenStreetMap</a> contributors'
            }).addTo(map);
    }

Answer 4

同时，您所要做的一切都是调用

npm install @types/leaflet@latest --save

并将源代码包含在index.html.中

无需其他进口或申报。然后，进口可能看起来像

import {control, LatLng, layerGroup, LayerGroup, Map} from "leaflet";

此外，映射初始化应该在ngOnInit()中进行，构造函数的使用不适用于逻辑。