Google Maps in Angular 12

Google map integration using google api in angular 12 example; In this tutorial, i am going to show you how to integrate google maps in Angular 12 Application.

Google Maps is a Web-based service that provides detailed information about geographical regions and sites around the world. In addition to conventional road maps, Google Maps offers aerial and satellite views of many places. In some cities, Google Maps offers street views comprising photographs taken from vehicles.

Angular 12 Integrate Google Maps Example Tutorial

Step 1 – Create New App

Execute the following command on terminal to create your angular app using bellow command:

ng new myNewApp

Then Open app.component.html file and put the below html markup:

<div class="row mt-5">
    <div class="col-md-9 mx-auto">
        <h2 class="text-left">Google Map</h2>
        <div class="card mt-3">
            <div class="card-body">
                <div #mapRef style="width:100%;height:400px"></div>
            </div>
        </div>
    </div>
</div>

Next, Open the app.component.ts file and add the below code:

@ViewChild('mapRef', {static: true }) mapElement: ElementRef;

Access <div #mapRef>: mapElement is a reference to <div #mapRef> inside app.component.html file. ViewChild directive creates a direct link between <div> element and a mapElement member variable.

Step 2 – Loading the Maps JavaScript API

You need to load the Maps JavaScript API in the app.module.ts file. If you don’t want to load it globally. You can create a new component and load it.

So, open the app.component.ts file and put the below two methods on this:

renderMap() {
   
  window['initMap'] = () => {
    this.loadMap();      
  }
  if(!window.document.getElementById('google-map-script')) {
    var s = window.document.createElement("script");
    s.id = "google-map-script";
    s.type = "text/javascript";
    s.src = "https://maps.googleapis.com/maps/api/js?key=AIzaSyDRmqZ-1VD-DbsccElMGtMtlRz9FndbPB4&callback=initMap";
     
    window.document.body.appendChild(s);
  } else {
    this.loadMap();
  }
}

loadMap = () => {
  var map = new window['google'].maps.Map(this.mapElement.nativeElement, {
    center: {lat: 24.5373, lng: 81.3042},
    zoom: 8
  });
 
  var marker = new window['google'].maps.Marker({
    position: {lat: 24.5373, lng: 81.3042},
    map: map,
    title: 'Hello World!',
    draggable: true,
    animation: window['google'].maps.Animation.DROP,
  });
 
  var contentString = '<div id="content">'+
  '<div id="siteNotice">'+
  '</div>'+
  '<h3 id="thirdHeading" class="thirdHeading">laratutorials.com</h3>'+
  '<div id="bodyContent">'+
  '<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>'+
  '</div>'+
  '</div>';
 
  var infowindow = new window['google'].maps.InfoWindow({
    content: contentString
  });
 
    marker.addListener('click', function() {
      infowindow.open(map, marker);
    });

In order to do any kind of interaction with the Maps API, you need an API key from Google. Follow the instructions here to get that set up. After the setup complete, You need to replace YOUR_API_KEYwith google map key.

You may noticed that, we have load the Google Maps JavaScript CDN under the renderMap method.

The renderMap method will check that the Google Maps JavaScript CDN is already loaded or not. If not then it will load the Google Maps JavaScript CDN. If already loaded then will call the loadMapmethod.

The loadMap will draw the map.

Next, you will call the renderMap method under ngOnInit method. like this:

ngOnInit() {
    this.renderMap();
}

Angular will invoked the ngOnInit only once when the directive is instantiated.

After above changes our app.component.ts file will looks like this

import {AfterViewInit, Component, ElementRef, ViewChild, OnInit} from '@angular/core';
 
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
 
  @ViewChild('mapRef', {static: true }) mapElement: ElementRef;
 
  constructor() {};
 
  ngOnInit() {    
    this.renderMap();
  }
 
  loadMap = () => {
    var map = new window['google'].maps.Map(this.mapElement.nativeElement, {
      center: {lat: 24.5373, lng: 81.3042},
      zoom: 8
    });
 
    var marker = new window['google'].maps.Marker({
      position: {lat: 24.5373, lng: 81.3042},
      map: map,
      title: 'Hello World!',
      draggable: true,
      animation: window['google'].maps.Animation.DROP,
    });
 
    var contentString = '<div id="content">'+
    '<div id="siteNotice">'+
    '</div>'+
    '<h3 id="thirdHeading" class="thirdHeading">laratutorials.com</h3>'+
    '<div id="bodyContent">'+
    '<p>Lorem ipsum dolor sit amet, consectetur adipiscing elit.</p>'+
    '</div>'+
    '</div>';
 
    var infowindow = new window['google'].maps.InfoWindow({
      content: contentString
    });
 
      marker.addListener('click', function() {
        infowindow.open(map, marker);
      });
 
  }
  renderMap() {
     
    window['initMap'] = () => {
      this.loadMap();      
    }
    if(!window.document.getElementById('google-map-script')) {
      var s = window.document.createElement("script");
      s.id = "google-map-script";
      s.type = "text/javascript";
      s.src = "https://maps.googleapis.com/maps/api/js?key=AIzaSyDRmqZ-1VD-DbsccElMGtMtlRz9FndbPB4&callback=initMap";
       
      window.document.body.appendChild(s);
    } else {
      this.loadMap();
    }
  }

Step 3 – Running application:

Run application using ng serve –o and you should see Google Maps inside browser. Congrats!! See, it was easy.

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