I am creating and refreshing a KML file every 30 seconds. It contains
vehicle's reports over a Google map V3, with ASP.NET 2010. The first
time I open the page it shows all the points on the map, including the
ones just reported, about 70 in total. After 30 seconds a timer re-
generates the KML file and reloads it with the following code:
First the map is loaded :
function init_map(map_canvas_id, lat, lng, zoomLevel) {
var myLatLng = new google.maps.LatLng(lat, lng);
var options =
{
zoom: 11,
center: myLatLng,
mapTypeId: google.maps.MapTypeId.ROADMAP,
mapTypeControl: true,
mapTypeControlOptions:
{
style: google.maps.MapTypeControlStyle.DROPDOWN_MENU,
position: google.maps.ControlPosition.TOP_LEFT
},
scaleControl: true,
scaleControlOptions: { position:
google.maps.ControlPosition.LEFT_BOTTOM },
navigationControl: true,
navigationControlOptions:
{
style: google.maps.NavigationControlStyle.SMALL, //
ZOOM_PAN
position: google.maps.ControlPosition.LEFT_TOP
}
}
var map_canvas = document.getElementById(map_canvas_id);
map = new google.maps.Map(map_canvas, options);
ctaLayer = new google.maps.KmlLayer(kml_url); // Carga en 'map'
el arc. KML
ctaLayer.setMap(map);
}
after that, and every 30 seconds i regenerate the KML file and refresh
the map:
function timer1()
{ // every 30 seconds
grid2.Refresh();
cpanel.PerformCallback();
try {
ctaLayer.setMap(null); // Borrar KML de memoria
}
catch (e) {
}
kml_url = "http://autorastreo.net/downloads/"; + g_fname;
try
{
ctaLayer = new google.maps.KmlLayer(kml_url,
{ preserveViewport: true });
ctaLayer.setMap(map);
}
catch (e)
{
}
}
I have not found a way to make it show the current data, only the
first file generated is shown, like if it was chached or buffered
someway. It always shows the first one. I even tried deleting the
files in the server side before executing:
ctaLayer = new google.maps.KmlLayer(kml_url, { preserveViewport:
true });
ctaLayer.setMap(map);
I also tried to find in the client side (windows XP IE 8) if the files
where cached, I found it and deleted it but with no success...!
Is there a cache function in Google Maps that I can desable? I tried
with Firefox and the problem is the same...! Any help will be very
appreciated. Thanks.
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