在ngx-传单中单击标记后材料对话框未打开

Question

我用ngx-leaflet和ngx-leaflet-draw来显示传单地图。我可以从工具栏标记图标在地图上显示一个标记。单击标记时，我希望显示“材料对话框”组件。当我单击标记时，我可以在控制台上显示标记坐标。代码是

​

public onMapReady(map: L.Map) {
    map.on(L.Draw.Event.CREATED, function(e) {
      const type = (e as any).layerType,
        layer = (e as any).layer;

      if (type === 'marker') {
        const markerCoordinates = layer._latlng;
        layer.on('click', () => {
          console.log(markerCoordinates); // works properly
        });
      }
    });
  }

​

然后，我尝试修改显示材料对话框组件的代码，但得到了错误。

​

import { NgZone } from '@angular/core';
import { MatDialog, MatDialogRef } from '@angular/material/dialog';
import { MaterialDialogComponent } from './m-dialog.component';
...
...
export class NgxLeafletComponent {
  dialogRef: MatDialogRef<MaterialDialogComponent>;

  public constructor(private zone: NgZone) {}

  public onMapReady(map: L.Map) {
      map.on(L.Draw.Event.CREATED, function(e) {
        const type = (e as any).layerType,
          layer = (e as any).layer;

        if (type === 'marker') {
          const markerCoordinates = layer._latlng;
          layer.on('click', () => {
            console.log(markerCoordinates); 
            this.zone.run(() => this.onClickMarker()); //error
          });
        }
      });
    }

  onClickMarker() {
    this.dialogRef = this.dialog.open(MaterialDialogComponent);
  }
 }

​

错误输出：

​

我也尝试不使用zone.run()方法，直接使用dialog.open()方法，但再次捕获错误。

Uncaught :无法读取未定义的属性“打开”

注意：，当我在onMapReady()外部尝试这个方法时，如果没有ngx-leaflet，它就会工作得很好。

Answer 1

我找到问题并解决了它。在这里，我在map.on(L.Draw.Event.CREATED, function(e) {...}上使用了正则函数()，不允许调用另一个函数。因此，它需要箭头函数来调用其中的另一个方法/函数。

​

import { NgZone } from '@angular/core';
import { MatDialog, MatDialogRef } from '@angular/material/dialog';
import { MaterialDialogComponent } from './m-dialog.component';
...
...
export class NgxLeafletComponent {
  dialogRef: MatDialogRef<MaterialDialogComponent>;

  public constructor(private zone: NgZone) {}

  public onMapReady(map: L.Map) {
      map.on(L.Draw.Event.CREATED, (e) => {
        const type = (e as any).layerType,
          layer = (e as any).layer;

        if (type === 'marker') {
          const markerCoordinates = layer._latlng;
          layer.on('click', () => {
            console.log(markerCoordinates); 
            this.zone.run(() => this.onClickMarker()); //error
          });
        }
      });
    }

  onClickMarker() {
    this.dialogRef = this.dialog.open(MaterialDialogComponent);
  }
 }

​