如何在角4中使用/集成谷歌地图apis

Question

how to use google maps apis in angular 4.

I am trying to use google maps. gave reference to google maps api with the key. but not able to use it. while integrating it . got the error google is not defined and to resolve i declared var google:any error got resolved but it is not building the map and now i am getting "Cannot read property 'firstChild' of null"

Answer 1

You can try this:

Step 1: npm install @types/googlemaps --save

Step 2 : Add below line into your index.html with correct google API key ( Don't forget it )

<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_GOOGLE_API_KEY&callback=initMap"
async defer></script>

Step 3 : Add below line to your html where you want to add google map

<div #googleMap style=”width:300%;height:300px”></div>

Step 4: Now you add below code into your angular component

import { Component, ViewChild } from '@angular/core';
import { } from '@types/googlemaps';

@Component({
  selector: 'map-component',
  templateUrl: './map.component.html',
  styleUrls: ['./map.component.css']
})

export class MapComponent {
  @ViewChild('googleMap') gmapElement: any;
  map: google.maps.Map;

  ngOnInit() {
    var mapProp = {
      center: new google.maps.LatLng(28.4595, 77.0266),
      zoom: 14,
      // mapTypeId: google.maps.MapTypeId.ROADMAP
      mapTypeId: google.maps.MapTypeId.HYBRID
      // mapTypeId: google.maps.MapTypeId.SATELLITE
      // mapTypeId: google.maps.MapTypeId.TERRAIN
    };

    this.map = new google.maps.Map(this.gmapElement.nativeElement, mapProp);
    var marker = new google.maps.Marker({ position: mapProp.center });
    marker.setMap(this.map);

    var infowindow = new google.maps.InfoWindow({
      content: "Hey, We are here"
    });

    infowindow.open(this.map, marker);
  }
}

Congratulations !!!

Here is the snapshot what you did.