Question

52

Reload Markers on Google's Maps API

rated 0 times [ 53] [ 1] / answers: 1 / hits: 48639 / 10 Years ago, mon, march 31, 2014, 12:00:00

Here is my code(most code from Google's API page).

<script>

    var beaches = [

      ['Bondi Beach', -12.890542, 120.274856, 4],

      ['Coogee Beach', -12.923036, 520.259052, 5],

      ['Cronulla Beach', -12.028249, 1221.157507, 3],

      ['Manly Beach', -12.80010128657071, 1121.28747820854187, 2],

      ['Maroubra Beach', -33.950198, 121.259302, 1]

    ];



    function setMarkers(map, locations) {

      for (var i = 0; i < locations.length; i++) {

        var beach = locations[i];

        var myLatLng = new google.maps.LatLng(beach[1], beach[2]);

        var marker = new google.maps.Marker({

            position: myLatLng,

            map: map,

            title: beach[0],

            zIndex: beach[3]

        });

      }

    }



    function initialize() {

      var mapOptions = {

        zoom: 3,

        center: new google.maps.LatLng(38.77417, -9.13417),

        mapTypeId: google.maps.MapTypeId.SATELLITE

      }

      var map = new google.maps.Map(document.getElementById('map-canvas'),

                                    mapOptions);



      setMarkers(map, beaches);

    }



    google.maps.event.addDomListener(window, 'load', initialize);



    setInterval(function() { setMarkers(map, beaches); }, 5000);



</script>

What I simply want to do is reload only the markers. I tried reloading the map using initialize function but it didn't work. Then I tried to reloading using setMarkers function and still no luck...

Thanks for your help.

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davonte

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3 Years ago

answered 10 Years ago lucillemariselal · Accepted Answer

Few things you should do / things that I have changed from your original code:

Use valid lat/lng coordinates for your markers (1121.28747820854187 for example is not a valid lng)

Create a global variable for your map (easier to reference in your script)

Create an array to hold your markers

I have added a marker animation animation: google.maps.Animation.DROP, to your markers, so that you can see when they are reloaded, and a reload markers button to call the reload function.

Basically what you want to do is:

Create each marker within the setMarkers function

Push each marker to the markers array

When reloading your markers, loop through your markers array and call setMap(null) on each marker to remove it from the map

Once done, call setMarkers again to re-draw your markers

Updated code:

var map;

var markers = []; // Create a marker array to hold your markers

var beaches = [

    ['Bondi Beach', 10, 10, 4],

    ['Coogee Beach', 10, 11, 5],

    ['Cronulla Beach', 10, 12, 3],

    ['Manly Beach', 10, 13, 2],

    ['Maroubra Beach', 10, 14, 1]

];



function setMarkers(locations) {



    for (var i = 0; i < locations.length; i++) {

        var beach = locations[i];

        var myLatLng = new google.maps.LatLng(beach[1], beach[2]);

        var marker = new google.maps.Marker({

            position: myLatLng,

            map: map,

            animation: google.maps.Animation.DROP,

            title: beach[0],

            zIndex: beach[3]

        });



        // Push marker to markers array

        markers.push(marker);

    }

}



function reloadMarkers() {



    // Loop through markers and set map to null for each

    for (var i=0; i<markers.length; i++) {



        markers[i].setMap(null);

    }



    // Reset the markers array

    markers = [];



    // Call set markers to re-add markers

    setMarkers(beaches);

}



function initialize() {



    var mapOptions = {

        zoom: 5,

        center: new google.maps.LatLng(10,12),

        mapTypeId: google.maps.MapTypeId.SATELLITE

    }



    map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);



    setMarkers(beaches);



    // Bind event listener on button to reload markers

    document.getElementById('reloadMarkers').addEventListener('click', reloadMarkers);

}



initialize();

Working example:

JSFiddle demo