Mapbox-gl.js 地图在加载事件的 angular-cli 项目中未定义

Question

启动了一个 angular-cli 项目并通过 npm 安装了 mapbox-gl。在 angular-cli.json 文件中包含 mapbox-gl 脚本和样式。我可以显示地图，但无法在加载事件中添加图层。地图突然未定义？这是模板 html (app.component.html):

<div id="map" style="margin:0; padding:0; position:absolute; top:25px; bottom:0; width:100%;">
</div>

这是我的组件代码 (app.component.ts):

import { Component, ViewChild, AfterViewInit, OnInit } from '@angular/core';
import * as mapboxgl from 'mapbox-gl';
import { Map } from 'mapbox-gl';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
  @ViewChild("map") map: Map;
  title = 'app';

  ngOnInit() {

    mapboxgl.accessToken = 'blah';   

    this.map = new Map({
      container: 'map',
      style: 'mapbox://styles/mapbox/light-v9',
      zoom: 5,
      center: [-78.880453, 42.897852]
    });

    this.map.on('load', this.onLoad);
  }

  onLoad(){
    console.log("map is loaded, can I still talk to it?");

    this.map.addLayer({
      "id": "points",
      "type": "symbol",
      "source": {
          "type": "geojson",
          "data": {
              "type": "FeatureCollection",
              "features": [{
                  "type": "Feature",
                  "geometry": {
                      "type": "Point",
                      "coordinates": [-77.03238901390978, 38.913188059745586]
                  },
                  "properties": {
                      "title": "Mapbox DC",
                      "icon": "monument"
                  }
              }, {
                  "type": "Feature",
                  "geometry": {
                      "type": "Point",
                      "coordinates": [-122.414, 37.776]
                  },
                  "properties": {
                      "title": "Mapbox SF",
                      "icon": "harbor"
                  }
              }]
          }
      },
      "layout": {
          "icon-image": "{icon}-15",
          "text-field": "{title}",
          "text-font": ["Open Sans Semibold", "Arial Unicode MS Bold"],
          "text-offset": [0, 0.6],
          "text-anchor": "top"
      }
  });

  }

}

项目位于 https://github.com/derobiom/mapboxAngularCli

Answer 1

尝试使用任一bind方法

this.map.on('load', this.onLoad.bind(this));

或局部箭头函数

this.map.on('load', () => this.onLoad());

或实例箭头函数

load = () => {
  ...

这样this将引用组件实例

Mapbox-gl.js 地图在加载事件的 angular-cli 项目中未定义

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