我正在使用 google-maps-utility-library-v3。我正在尝试放大和缩小,如果点不再出现在屏幕上,我想看到计数 0。但它不起作用。如果我注释掉 mgr.addMarkers(markers,5); 它有效....但它始终为 0,因为没有制造商由经理管理。有人能告诉我为什么吗?
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map_canvas { height: 100% }
</style>
<script type="text/javascript"
src="http://maps.googleapis.com/maps/api/js?key=??????????????&sensor=false">
</script>
<script type="text/javascript" src="downloadxml.js"></script>
<script src="http://google-maps-utility-library-v3.googlecode.com/svn/tags/markermanager/1.0/src/markermanager.js"></script>
<script type="text/javascript">
var map = null;
function initialize() {
var myOptions = {
zoom: 8,
center: new google.maps.LatLng(42.35428, -71.05525),
mapTypeId: google.maps.MapTypeId.ROADMAP
}
map = new google.maps.Map(document.getElementById('map'), myOptions);
//hard code a marker
var lat = 42.35428;
var lng = -71.05525;
var point = new google.maps.LatLng(lat,lng);
var html = "I am a hard-coded dot";
var marker = new google.maps.Marker({
map: map,
position: point,
icon: "http://www.google.com/mapfiles/arrow.png",
shadow: "http://www.google.com/mapfiles/arrowshadow.png"
});
var markers = [];
markers.push(marker);
var mgr = new MarkerManager(map);
mgr.addMarkers(markers,5);
mgr.refresh();
google.maps.event.addListener(map, 'zoom_changed', function() {
var zoomLevel = map.getZoom();
var count = mgr.getMarkerCount(zoomLevel);
document.getElementById("Listing").innerHTML += count + "<BR>";
});
}
</script>