Adding multiple markers in ionic google map

问题:

I am trying to integrate google map in ionic project and got succeeded in displaying the google map on ionic page. But i want to display multiple markers on the this google map. tried different code but not getting this multiple markers thing. below is my code:

html:

<ion-content>

<div #mapElement class="map" >

</div>

.ts file:

import {AfterViewInit, Component, ElementRef, OnInit, ViewChild} from '@angular/core';

 declare var google;

@Component({
selector: 'app-home',
templateUrl: 'home.page.html',
styleUrls: ['home.page.scss'],
 })
   export class HomePage implements OnInit, AfterViewInit{

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

constructor() {}

ngOnInit() {
}

ngAfterViewInit(): void {
var locations = [
  ['Bondi Beach', -33.890542, 151.274856, 4],
  ['Coogee Beach', -33.923036, 151.259052, 5],
  ['Cronulla Beach', -34.028249, 151.157507, 3],
  ['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
  ['Maroubra Beach', -33.950198, 151.259302, 1]
];

var map = new google.maps.Map(document.getElementById('map'), {
  zoom: 10,
  center: new google.maps.LatLng(-33.92, 151.25),
  mapTypeId: google.maps.MapTypeId.ROADMAP
});

var infowindow = new google.maps.InfoWindow();

var marker, i;

for (i = 0; i < locations.length; i++) { 
  marker = new google.maps.Marker({
    position: new google.maps.LatLng(locations[i][1], locations[i][2]),
    map: map
  });

  google.maps.event.addListener(marker, 'click', (function(marker, i) {
    return function() {
      infowindow.setContent(locations[i][0]);
      infowindow.open(map, marker);
    }
  })(marker, i));
}

}

 }

i want to add diffent location markers on the map using latitude and longitude values similar to below reference image

please help me how can i do this. thank you

回答1:

On one project i needed to do the same so i made this function. So you only need to put a for/foreach with the list you want to print and thats all.

Hope this help you.

private createMarker(position, label, element, icon) {

if (this.map != undefined) {
  let marker = new google.maps.Marker({
    position: position,
    map: this.map,
    icon: {
      url: icon, // url
      scaledSize: new google.maps.Size(40, 40), // scaled size
    }

  });
  google.maps.event.addListener(marker, 'click', function () {

    var infowindow = new google.maps.InfoWindow({
      content: "content"
    });
    infowindow.open(this.map, marker);

  });
} else {
  console.log("map is undefined");
}

}

with loop you should be able to create the markers correctly with the function above:

this.markers.forEach(element => {

  this.infomarkers.forEach(info => {

    if (element.id == info.id) {

      this.createMarker(element.position, element.label, info, element.icon);

    }

  });

});

回答2:

you can define some markers like this:

new google.maps.Marker({
  map: map,
  position: {lat: -34.397, lng: 150.644},
  icon: {
    url: "http://maps.google.com/mapfiles/ms/icons/blue-dot.png"
  }
});

for more information see the tutorial here: https://medium.com/free-code-camp/how-to-change-javascript-google-map-marker-color-8a72131d1207