How to add marker on google map with two locations

Question

I would like to add markers on google map with two locations, that are clickable. When I click on the button it should change the map marker with the location.

 <script>
    var map;
    function initialize()
    {
        map = new google.maps.Map(document.getElementById('map-canvas'), {
            center: new google.maps.LatLng(52.302516, 16.414546), //Setting Initial Position
            zoom: 14,

        });
        var marker = new google.maps.Marker({
            position: newLocation(),
            map: map,
            title: 'AGM-CORP',
            icon: 'img/agm-marker.png'
        });
    }

    function newLocation(newLat, newLng)
    {
        map.setCenter({
            lat: newLat,
            lng: newLng
        });
    }

    google.maps.event.addDomListener(window, 'load', initialize);
    $(document).ready(function ()
    {
        $("#1").on('click', function ()
        {
            newLocation(52.302516, 16.414546);
        });

        $("#2").on('click', function ()
        {
            newLocation(51.706478, 15.274753);
        });
    });
</script>
<div id="map-canvas"></div>
</div>
    <h3>Zobacz lokalizację:</h3>
    <button id="1" style="padding:10px; cursor:pointer;">Siedziba Firmy</button>
    <button id="2" style="padding:10px;cursor:pointer;">Kopalnia Kruszyw</button>
</div>

Answer 1

var map = null
var marker = null;
var myLatLng = {
  lat: 52.302516,
  lng: 16.414546
};

function initMap() {

  map = new google.maps.Map(document.getElementById('map'), {
    center: new google.maps.LatLng(myLatLng.lat, myLatLng.lng),
    zoom: 14,
  });

  marker = new google.maps.Marker({
    position: myLatLng,
    map: map,
    title: 'Hello World!'
  });
}

function updateMap(lat, lng) {;
  myLatLng.lat = lat;
  myLatLng.lng = lng
  map.setCenter(myLatLng);
  marker.setPosition(myLatLng);
}


$(document).ready(function() {
  $("#1").on('click', function() {
    updateMap(52.302516, 16.414546);
  });

  $("#2").on('click', function() {
    updateMap(51.706478, 15.274753);
  });
});

I am initing the map with new marker. Working jffiddle is here

Answer 2

this function will only switch the location of the view:

map.setCenter({
   lat: newLat,
   lng: newLng
});

use this instead:

new google.maps.LatLng(-25.363882,131.044922);

secondly to you need to add event listner to the marker object for it to work properly:

// create markers on the map
marker1 = new google.maps.Marker({ ... })
marker2 = new google.maps.Marker({ ... })
marker3 = new google.maps.Marker({ ... })

// add event listener
marker1.addListener('click', function() { ... })
marker2.addListener('click', function() { ... })

further check out the docs they are pretty straight forward.

Answer 3

This will work. Have a global variable that holds the marker. Whenever the location is changed, set the marker in the position of Lat and Lng using the setPosition method and use setCenter method to show the marker in the center. No need to init the map every time.

var map,marker;
function initialize()
{
    map = new google.maps.Map(document.getElementById('googleMap'), {
        center: new google.maps.LatLng(52.302516, 16.414546), //Setting Initial Position
        zoom: 6,
    });
    setLocation(52.302516,16.414546);
}

function setLocation(newLat, newLng)
{
    var latlng = new google.maps.LatLng(newLat,newLng);
    if(marker) //Remove the marker, if already set
    {
        marker.setMap(null);
    }
    marker = new google.maps.Marker({
        position: latlng,
        map: map,
        title: 'AGM-CORP'
    });
    map.setCenter(latlng);

}

$(document).ready(function ()
{
    $("#1").on('click', function ()
    {
        setLocation(13.070814558816117, 80.2656996835234);
    });

    $("#2").on('click', function ()
    {
        setLocation(59.4739316352335,-110.89646088128342);
    });
});