angular - Angular2 - How to setup a google.maps.OverlayView? (translate JS prototype into Typescript)

Question

I'd like to create a google map component that work like that : https://jsfiddle.net/gvvy5vxz/2/

It's based on this : https://developers.google.com/maps/documentation/javascript/examples/overlay-simple

I'm new to typescript and i'm stuck with the prototype implementation, specially with this JS snippet:

USGSOverlay.prototype = new google.maps.OverlayView();

USGSOverlay(bounds, image, map) {

    // Initialize all properties.
    this.bounds_ = bounds;
    this.image_ = image;
    this.map_ = map;

    // Define a property to hold the image's div. We'll
    // actually create this div upon receipt of the onAdd()
    // method so we'll leave it null for now.
    this.div_ = null;

    // Explicitly call setMap on this overlay.
    this.setMap(map);
  }

I have no clue how to translate that in a typescript way and how to declare things properly.

I guess I should create a class USGSOverlay that extends google.maps.OverlayView but it doesn't work.

class USGSOverlay extends google.maps.OverlayView{

  bounds_;
  image_;
  map_;
  div_;

  constructor(bounds, image, map){
    // Initialize all properties.
    this.bounds_ = bounds;
    this.image_ = image;
    this.map_ = map;

    // Define a property to hold the image's div. We'll
    // actually create this div upon receipt of the onAdd()
    // method so we'll leave it null for now.
    this.div_ = null;

    // Explicitly call setMap on this overlay.
    this.setMap(map);
  }
}

This my working base component. It creates a simple map inside #map:

import { Component } from '@angular/core';
declare const google: any;
/*
/*  Component Map
*/
@Component({
  selector: 'map',
  template: `
    <div id="map"></div>
  `,
  styles: [
    `#map{ width:100%; height:100%; position: absolute; width:100%; height:100%; top:0; left:0;}`
  ],
})
export class MapComponent {

  ngOnInit(){
    google.maps.event.addDomListener(window, 'load', this.initMap);
  }

  initMap() {

    const map = new google.maps.Map(document.getElementById('map'), {
      zoom: 11,
      center: {lat: 62.323907, lng: -150.109291},
      mapTypeId: google.maps.MapTypeId.SATELLITE
    });

    const bounds = new google.maps.LatLngBounds(
        new google.maps.LatLng(62.281819, -150.287132),
        new google.maps.LatLng(62.400471, -150.005608));
  }
}

Answer 1

Here is what worked for me (using ionic 2):

1. Use these commands:

   npm install typings --global
   typings install dt~google.maps --global --save
   typings install google.maps --global
   

2. Add "typings/*.d.ts" in your tsconfig.json:

   "include": [
     "src/**/*.ts",
     "typings/*.d.ts"
   ]
   

3. Here is the TypeScript code:

   import { Component, ViewChild, ElementRef } from '@angular/core';
   import { NavController } from 'ionic-angular';
   // import typings
   import { } from '@types/googlemaps';
   /*
   /*  Component Map
   */
   @Component({
       selector: 'page-overlay',
       templateUrl: 'overlay.html'
   })
   export class OverlayPage {
       @ViewChild('map') mapElement: ElementRef;
       map: any;
       // weird syntax, I know, but it works
       constructor(public navCtrl: NavController) {
       }
       USGSOverlay = class extends google.maps.OverlayView {
           bounds_: any;
           image_: any;
           map_: any;
           div_: any;
           constructor(bounds, image, private map) {
               super();
               // Initialize all properties.
               this.bounds_ = bounds;
               this.image_ = image;
               this.map_ = map;
               // Define a property to hold the image's div. We'll
               // actually create this div upon receipt of the onAdd()
               // method so we'll leave it null for now.
               this.div_ = null;
               // Explicitly call setMap on this overlay.
               this.setMap(map);
               this.set
           }
           /**
            * onAdd is called when the map's panes are ready and the overlay has been
            * added to the map.
            */
           onAdd() {
               const div = document.createElement('div');
               div.style.borderStyle = 'none';
               div.style.borderWidth = '0px';
               div.style.position = 'absolute';
               // Create the img element and attach it to the div.
               const img = document.createElement('img');
               img.src = this.image_;
               img.style.width = '100%';
               img.style.height = '100%';
               img.style.position = 'absolute';
               div.appendChild(img);
               this.div_ = div;
               // Add the element to the "overlayLayer" pane.
               const panes = this.getPanes();
               panes.overlayLayer.appendChild(div);
           };
           draw() {
               // We use the south-west and north-east
               // coordinates of the overlay to peg it to the correct position and size.
               // To do this, we need to retrieve the projection from the overlay.
               const overlayProjection = this.getProjection();
               // Retrieve the south-west and north-east coordinates of this overlay
               // in LatLngs and convert them to pixel coordinates.
               // We'll use these coordinates to resize the div.
               const sw = overlayProjection.fromLatLngToDivPixel(this.bounds_.getSouthWest());
               const ne = overlayProjection.fromLatLngToDivPixel(this.bounds_.getNorthEast());
               // Resize the image's div to fit the indicated dimensions.
               const div = this.div_;
               div.style.left = sw.x + 'px';
               div.style.top = ne.y + 'px';
               div.style.width = (ne.x - sw.x) + 'px';
               div.style.height = (sw.y - ne.y) + 'px';
           };
           // The onRemove() method will be called automatically from the API if
           // we ever set the overlay's map property to 'null'.
           onRemove() {
               this.div_.parentNode.removeChild(this.div_);
               this.div_ = null;
           };
       };
       ngOnInit() {
           this.loadMap();
           var bounds = new google.maps.LatLngBounds(
               new google.maps.LatLng(62.281819, -150.287132),
               new google.maps.LatLng(62.400471, -150.005608));
           // The photograph is courtesy of the U.S. Geological Survey.
           var srcImage = 'https://developers.google.com/maps/documentation/' +
               'javascript/examples/full/images/talkeetna.png';
           const overlay = new this.USGSOverlay(bounds, srcImage, this.map);
           //overlay.setMap(this.map);
       }
       ionViewDidLoad() {
           this.loadMap();
           var bounds = new google.maps.LatLngBounds(
               new google.maps.LatLng(62.281819, -150.287132),
               new google.maps.LatLng(62.400471, -150.005608));
           // The photograph is courtesy of the U.S. Geological Survey.
           var srcImage = 'https://developers.google.com/maps/documentation/' +
               'javascript/examples/full/images/talkeetna.png';
           const overlay = new this.USGSOverlay(bounds, srcImage, this.map);
           //overlay.setMap(this.map);
       }
       loadMap() {        
           let latLng = new google.maps.LatLng(62.323907, -150.109291);
           var mapOptions = {
               zoom :15,
               center : latLng,
               enableHighAccuracy: true,
               timeout: 5000,
               maximumAge: 0
           };
           this.map = new google.maps.Map(this.mapElement.nativeElement, mapOptions);
       }
   }