ERROR TypeError: Cannot read property 'topleft' of undefined on ngx-leaflet and esri-leaflet-geocoder

Question

我在 Angular 9 项目中使用 @asymmetrik/ngx-leaflet 和 @asymmetrik/ngx-leaflet-draw 作为传单地图。我尝试通过 'esri-leaflet-geocoder' 在地图中添加搜索选项。没有 @asymmetrik/ngx-leaflet 和 @asymmetrik/ngx-leaflet-draw 使用我成功地将搜索选项放置在地图中没有错误。完全没问题。这是我的工作代码：

/*npm install esri-leaflet esri-leaflet-geocoder*/
import * as L from 'leaflet';
import * as esriGeo from 'esri-leaflet-geocoder';

export class MapComponent implements OnInit {
  public searchControl = new esriGeo.Geosearch();
  
  ngOnInit() {
    this.initMap();        // not all codes are here;
    this.tiles.addTo(L.map);   // not all codes are here;
    
    this.searchControl.addTo(L.map);
  }
}

输出图像：

但是当我尝试在之前完成 @asymmetrik/ngx-leaflet 和 @asymmetrik/ngx-leaflet-draw 的地方实现相同的代码时，它说一些错误： ERROR TypeError: Cannot read property 'topleft' of undefined 。 错误输出图像：

Answer 1

我刚刚解决了这个问题。虽然我使用的是 ngx-leaflet 所以这里 L.Map 不是地图的当前实例。 ngx-leaflet 从 LeafletDirective 初始化地图。所以工作代码是：

/*npm install esri-leaflet esri-leaflet-geocoder*/
import * as L from 'leaflet';
import * as esriGeo from 'esri-leaflet-geocoder';
import { LeafletDirective } from '@asymmetrik/ngx-leaflet'; //new import

export class MapComponent implements OnInit {
  public searchControl = new esriGeo.Geosearch();
  
  ngOnInit() {
    const map = this.leafletDirective.getMap(); // initialize map
    
    this.searchControl.addTo(map);
  }
}