Utilizing Ionic 2 and Angular 2 to integrate Google Maps and display multiple markers based on coordinates retrieved

I'm currently working on implementing multiple markers on a map within my Ionic 2 app.

    //Establishing connection to locations database
    this.db.connect();
    let locations = this.db.collection('locations');

    //Fetching all user locations from the database
    locations.fetch().subscribe(msg => console.log(msg));

    //Iterating through each location to add markers
    for (let i = 0; i < 10; i++) {

        let pin = locations[i];
        let location: any;

        let marker = new google.maps.Marker({
                map: this.map,
                animation: google.maps.Animation.DROP,
                position : {"lat": 2433, "lng": 234}
        });

        //Information displayed in marker window on the Map
        let content = 
        //User profile details
        '<h3>Name: </h3>' + this.user.details.name + 
        '<h3>Email: </h3>' + this.user.details.email + 
        '<h3>Image: </h3>' + '<img src='+this.user.details.image+'>' +
        '<button id="sendRequest()" (click)>Request Walk</button>';

        this.addInfoWindow(marker, content);
    }
    //end of locations loop

Currently, I'm using placeholder coordinates for latitude and longitude. However, I have actual location data including user email, lat, and lng values in my locations database. I can see this data in my console log.

My main goal is to figure out how to access and utilize this data to accurately plot multiple markers on the map.

Answer №1

If the data stored in the msg variable matches the one in the attached image, you will need to iterate over the records once they are retrieved. Here is an example of how you can achieve this:

locations.fetch().subscribe(msg:Array => {
  var bounds = new google.maps.LatLngBounds();

  for (let record of msg) {    
    var marker = new google.maps.Marker({
      map: this.map,
      animation: google.maps.Animation.DROP,
      position: { lat: record.lat, lng: record.long },
      __infowindow: new google.maps.InfoWindow({
        content: '<h3>Email: </h3>' + record.email
      })
    });

    marker.addListener('click', ()=>{
      this.__infowindow.open(this.map, this);
    });
    bounds.extend(marker.getPosition());
  }
  this.map.fitBounds(bounds);
});

The __infowindow attribute in the Marker object is used as a workaround to prevent JavaScript errors. Using let infowindow =... within the loop would result in the variable being destroyed, while using var infowindow = ... would reference the last infowindow created.

Although the exact code has not been tested, a similar version has been successfully executed.

Additionally, to ensure all markers are visible on the map, the following instructions have been included:

var bounds = new google.maps.LatLngBounds();
...
bounds.extend(marker.getPosition());
...
this.map.fitBounds(bounds);

This feature allows the map to automatically adjust its size to accommodate all markers.

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