Geolocation: moving only google maps marker without reload the map

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I need to update only the marker when the device is moving or when the device is getting more accuracy. When the position change also reload the map and I need to move only

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梦毁少年i

2020-12-29 00:20

one easy way to do is, simply call map.clearOverlays(); then read add new positions with map.addOverlay(<marker>)

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逝去的感伤

2020-12-29 00:32

I believe that the problem is that you create a new map inside the watchPosition function. You only need to create one marker and then update its position inside the watchPosition function.

navigator.geolocation.watchPosition(
    function (position) {
        setMarkerPosition(
            currentPositionMarker,
            position
        );
    });

function setMarkerPosition(marker, position) {
    marker.setPosition(
        new google.maps.LatLng(
            position.coords.latitude,
            position.coords.longitude)
    );
}

Maybe this example will help you:

<!doctype html>
<html lang="en">

    <head>
        <title>Google maps</title>
        <script src="http://code.jquery.com/jquery-1.8.2.min.js"></script>
        <script type="text/javascript" src="http://maps.google.com/maps/api/js?v=3&sensor=false&language=en"></script>
        <script type="text/javascript">

            var map,
                currentPositionMarker,
                mapCenter = new google.maps.LatLng(40.700683, -73.925972),
                map;

            function initializeMap()
            {
                map = new google.maps.Map(document.getElementById('map_canvas'), {
                   zoom: 13,
                   center: mapCenter,
                   mapTypeId: google.maps.MapTypeId.ROADMAP
                 });
            }

            function locError(error) {
                // the current position could not be located
                alert("The current position could not be found!");
            }

            function setCurrentPosition(pos) {
                currentPositionMarker = new google.maps.Marker({
                    map: map,
                    position: new google.maps.LatLng(
                        pos.coords.latitude,
                        pos.coords.longitude
                    ),
                    title: "Current Position"
                });
                map.panTo(new google.maps.LatLng(
                        pos.coords.latitude,
                        pos.coords.longitude
                    ));
            }

            function displayAndWatch(position) {
                // set current position
                setCurrentPosition(position);
                // watch position
                watchCurrentPosition();
            }

            function watchCurrentPosition() {
                var positionTimer = navigator.geolocation.watchPosition(
                    function (position) {
                        setMarkerPosition(
                            currentPositionMarker,
                            position
                        );
                    });
            }

            function setMarkerPosition(marker, position) {
                marker.setPosition(
                    new google.maps.LatLng(
                        position.coords.latitude,
                        position.coords.longitude)
                );
            }

            function initLocationProcedure() {
                initializeMap();
                if (navigator.geolocation) {
                    navigator.geolocation.getCurrentPosition(displayAndWatch, locError);
                } else {
                    alert("Your browser does not support the Geolocation API");
                }
            }

            $(document).ready(function() {
                initLocationProcedure();
            });

        </script>
    </head>

    <body>
        <div id="map_canvas" style="height:600px;"></div>
    </body>

</html>

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