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Angular 10|9|8 Google Maps with Places Search and Draggable Marker using Angular Google Maps (@agm/core)

 1.Install Angular Google Maps

To use Google Maps in Angular application, install the @agm/core package

Run the following command to install AGM in Angular

Install Types for GoogleMaps


$ npm install @types/googlemaps --save-dev

Update App Module

Next, open the app.module.ts file, import AgmCoreModule then update the imports array

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

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

import { AgmCoreModule } from '@agm/core';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AgmCoreModule.forRoot({
      apiKey: 'YOUR-API-KEY-HERE',
      libraries: ['places']
    })
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }



Adding Google Maps in Component

For creating a Google Map in the template, we add the <agm-map/> component with binding properties for setting latitude, longitude, zoom, and other configurations.

The map will also have a Marker, which is created by adding the <agm-marker/> component.

# Update App Template

Add the AGM template in the App component to show basic Google Map with the current location. To get current coordinates like longitude & latitude, we will use geolocation service in the navigator.

<!-- app.component.html -->
<agm-map 
[latitude]="latitude" 
[longitude]="longitude" 
[zoom]="zoom" >
  <agm-marker 
  [latitude]="latitude" 
  [longitude]="longitude"></agm-marker>
</agm-map>
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# Update Component Class

On component load, we’ll call the navigator.geolocation API service to get current position of the user. The setCurrentLocation() method will fetch latitude and longitude to set Google Map to the current location.

//app.component.ts

import { Component, OnInit } from '@angular/core';
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent  implements OnInit {
  title: string = 'AGM project';
  latitude: number;
  longitude: number;
  zoom:number;


  ngOnInit() {
    this.setCurrentLocation();
  }

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

}

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Add Map height in app.component.scss

agm-map {
    height: 300px;


Location/ Places Search bar

In app.component.html we will now add a search bar with address and Latitude & Longitude information.

The marker is now draggable so that the user can drag it to the desired location.

[markerDraggable]option is set to true.

(dragEnd)the event will fire to get the address of the current drop.

# Update the App component template

<!-- app.component.html -->
<div class="container">

  <h1>Angular Google Maps with Places Search Example</h1>

  <div class="form-group">
    <label>Enter address</label>
    <input type="text" class="form-control" (keydown.enter)="$event.preventDefault()" placeholder="Search Nearest Location" autocorrect="off" autocapitalize="off" spellcheck="off" type="text" #search>
  </div>

  <agm-map [latitude]="latitude" [longitude]="longitude" [zoom]="zoom">
    <agm-marker [latitude]="latitude" [longitude]="longitude" [markerDraggable]="true"
      (dragEnd)="markerDragEnd($event)"></agm-marker>
  </agm-map>

  <h5>Address: {{address}}</h5>
  <div>Latitude: {{latitude}}</div>
  <div>Longitude: {{longitude}}</div>
</div>
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# Update Component Class

In app.component.ts we will add Google map Autocomplete method to return address data set.

Geocoder location service will return address based on provided Latitude & Longitude in the method getAddress()

The template reference variable #search on Input field is used to find the key events for fetching addresses based on current location.

The markerDragEnd() method is called after the user stops marker drag to fetch the address of the current marker position.

//app.component.ts

import { Component, OnInit, ViewChild, ElementRef, NgZone } from '@angular/core';
import { MapsAPILoader, MouseEvent } from '@agm/core';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
  title: string = 'AGM project';
  latitude: number;
  longitude: number;
  zoom: number;
  address: string;
  private geoCoder;

  @ViewChild('search')
  public searchElementRef: ElementRef;


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


  ngOnInit() {
    //load Places Autocomplete
    this.mapsAPILoader.load().then(() => {
      this.setCurrentLocation();
      this.geoCoder = new google.maps.Geocoder;

      let autocomplete = new google.maps.places.Autocomplete(this.searchElementRef.nativeElement);
      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 and zoom
          this.latitude = place.geometry.location.lat();
          this.longitude = place.geometry.location.lng();
          this.zoom = 12;
        });
      });
    });
  }

  // Get Current Location Coordinates
  private setCurrentLocation() {
    if ('geolocation' in navigator) {
      navigator.geolocation.getCurrentPosition((position) => {
        this.latitude = position.coords.latitude;
        this.longitude = position.coords.longitude;
        this.zoom = 8;
        this.getAddress(this.latitude, this.longitude);
      });
    }
  }


  markerDragEnd($event: MouseEvent) {
    console.log($event);
    this.latitude = $event.coords.lat;
    this.longitude = $event.coords.lng;
    this.getAddress(this.latitude, this.longitude);
  }

  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('Geocoder failed due to: ' + status);
      }

    });
  }

}

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For making it look beautiful we have added bootstrap.css in index.html

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">



Comments

  1. Emma HazelSeptember 18, 2023 at 5:38 AM

    Superb Post!
    Thanks for providing such a comprehensive overview of this topic.
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