地理定位：在不重新加载地图的情况下只移动谷歌地图标记

Question

地理定位：在不重新加载地图的情况下只移动谷歌地图标记

javascripthtmlgoogle-mapsgoogle-maps-api-3geolocation

7

当设备移动或获取更高的精度时，我只需要更新标记。当位置改变时重新加载地图，并且我只需要移动标记。以下是我的代码：

if (navigator.geolocation) {
    navigator.geolocation.watchPosition(

    function(position){
    var latitude = position.coords.latitude;
    var longitude = position.coords.longitude;
    var accuracy = position.coords.accuracy;
    var coords = new google.maps.LatLng(latitude, longitude);
    var mapOptions = {
        zoom: 20,
        center: coords,
        streetViewControl: false,
        mapTypeControl: false,
        navigationControlOptions: {
            style: google.maps.NavigationControlStyle.SMALL
        },
        mapTypeId: google.maps.MapTypeId.ROADMAP
        };

     var capa = document.getElementById("capa");
     capa.innerHTML = "latitud: " + latitude + " longitud: " + "   aquesta es la precisio en metres  :  " + accuracy;  

        map = new google.maps.Map(
            document.getElementById("mapContainer"), mapOptions
            );
        var marker = new google.maps.Marker({
                position: coords,
                map: map,
                title: "ok"
        });


    },function error(msg){alert('Please enable your GPS position future.');  

  }, {maximumAge:0, timeout:5000, enableHighAccuracy: false});

}else {
    alert("Geolocation API is not supported in your browser.");
}

谢谢！

- Francesc VE

2个回答

3

一个简单的方法是，只需调用map.clearOverlays();然后使用map.addOverlay(<marker>)添加新位置。

- amit

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- Apostolos Emmanouilidis · Accepted Answer

我相信问题在于你在watchPosition函数内创建了一个新地图。你只需要创建一个标记，然后在watchPosition函数内更新其位置。

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

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

也许这个例子能帮到您：

<!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>