在Angular中未定义的Geocoder类型错误

时间:2019-06-20 18:13:20

标签: angular google-maps google-geocoder angular-google-maps

我的Angular项目中的Geocoder由于未定义而崩溃。我尝试了这个: Getting 'Uncaught TypeError: Cannot read property 'geocode' of undefined ' error

但是如果我首先对其进行初始化或分配,它将不起作用。两者都不起作用。

我的代码,第一行出现错误:

private geoCoder = new google.maps.Geocoder();

  @ViewChild('search', { static: false })
  public searchElementRef: ElementRef;

  constructor(private maps: MapsAPILoader, private ngZone: NgZone){ }

  ngOnInit() {
    // Load places autocomplete
    this.maps.load().then(() => {
      this.setCurrentLocation();

      let autocomplete = new google.place.Autocomplete(this.searchElementRef.nativeElement, {
        types: ["address"]
      });

      autocomplete.addListener("place_changed", () => {
        this.ngZone.run(() => {
          // Get the place result
          let place: google.maps.places.PlaceResult = autocomplete.getPlace();

          // Verify result
          if (place.geometry === undefined || place.geometry === null) {
            return;
          }

          // Set latitude, longitude & zoom
          this.userLat = place.geometry.location.lat();
          this.userLng = place.geometry.location.lng();
          this.zoom = 12;
        });
      });
    });
  }

  // Get Current Location Coordinates
  private setCurrentLocation() {
    if ('geolocation' in navigator) {
      navigator.geolocation.getCurrentPosition((position) => {
        this.userLat = position.coords.latitude;
        this.userLng = position.coords.longitude;
        this.zoom = 15;
      });
    }
  }

getaddress(latitude, longitude) {
    this.geoCoder.geocode({ "location": { lat: latitude, lng: longitude } }, (results, status) => {
      console.log(results);
      console.log(status);

      if (status === "Ok") {
        if (results[0]) {
          this.zoom = 12;
          this.address = results[0].formatted_address;
        } else {
          window.alert("No results found.");
        }
      } else {
        window.alert("Something went wrong, please try again.");
      }
    });
  }

从(向下滚动到“添加位置/地点搜索”栏):

https://www.freakyjolly.com/angular-7-6-add-google-maps-in-angular-2-plus-applications-using-angular-google-maps-module-agm-core-easily/

如何防止崩溃?谢谢!

编辑:固定: https://stackblitz.com/edit/angular-rhbjrx

3 个答案:

答案 0 :(得分:0)

等待地图加载器,然后在Geocoder()中分配ngOnInit()

this.mapsAPILoader.load().then(() => {
      this.setCurrentLocation();
      this.geoCoder = new google.maps.Geocoder;
  .....
}

请确保安装:

npm install @types/googlemaps --save-dev

编辑:

正确导入module.ts:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { AgmCoreModule } from '@agm/core';

import { AppComponent } from './app.component';

@NgModule({
  imports:      [ 
    AgmCoreModule.forRoot({
      apiKey: 'AIzaSyCnn-_D68N95BaSpYRYn1E3N_DHGs1vz0Y',
      libraries: ["places"]
    }),
    BrowserModule,
    FormsModule,
    ReactiveFormsModule
   ],
  declarations: [ AppComponent ],
  bootstrap:    [ AppComponent ]
})
export class AppModule { }

答案 1 :(得分:0)

Geocoder初始化以来,尚未加载Google Maps API,因此发生了错误。在Angular Google MapsMapsAPILoader中,可以利用服务来确保Google Maps API已加载,然后初始化Geocoder

this.mapsAPILoader.load().then(() => {
   this.geoCoder = new google.maps.Geocoder;  
});

下面是一个示例(改编自official Geocoding Service example),该示例演示了如何将Goolge Maps地理编码服务与Angular Google Maps一起使用

export class AppComponent implements OnInit {
  center = {lat: -34.397, lng: 150.644};
  position= {lat: null, lng: null};
  zoom: number = 8;
  address: string;
  private geoCoder;


  constructor(
    private mapsAPILoader: MapsAPILoader,
    private ngZone: NgZone
  ) { }


  ngOnInit() {
    this.mapsAPILoader.load().then(() => {
       this.geoCoder = new google.maps.Geocoder;  
    });
  }


  geocodeAddress(addressInput) {
    const address = addressInput.value;
    this.geoCoder.geocode({'address': address}, (results, status) => {
          if (status === 'OK') {
            this.position = {
              "lat": results[0].geometry.location.lat(),
              "lng": results[0].geometry.location.lng()
            }
          } else {
            alert('Geocode was not successful for the following reason: ' + status);
          }
    });
  }

}

这是demo

答案 2 :(得分:0)

您需要确保您具有正确的import语句并使用正确的库。

由于Geocoder并未在@agm中定义,而是在@types/googlemaps中定义,如果没有npm install --save @types/googlemaps,则需要下载。

使用以下导入语句:import { } from 'googlemaps';制成此文件后,将index.d.ts放在src文件夹或根目录下,并在其中声明以下内容:

index.d.ts

declare module "googlemaps";

并确保将您的Geocoder放在括号中:Geocoder()

这应该可以解决问题,就像对我一样。

请参见https://stackblitz.com/edit/angular-rhbjrx