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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 the maker. I have the following code:
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.");
}
Thanks!
200
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>
one easy way to do is, simply call map.clearOverlays(); then read add new positions with map.addOverlay(<marker>)
45
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