我正在向您寻求帮助,因为我在一个问题上停留了几个小时,但我没有找到这个问题的结束......每次当访客在地图上移动时更新我的标记列表时,都会添加标记在那些已经添加的之上。我尝试了几种方法在更新之前删除所有标记,但没有成功。
这是我的initialize
功能:
function initalize() {
// Creating a new map
var mapDiv = document.getElementById("googlemap");
mapCanvas = new google.maps.Map(mapDiv, {
mapTypeId : google.maps.MapTypeId.ROADMAP,
noClear : true
});
var latlng = new google.maps.LatLng(49, 2);
// Add a control
// Generate bunch markers
var sw = new google.maps.LatLng(-19.,-152.);
var ne = new google.maps.LatLng(76,58 );
var bounds = new google.maps.LatLngBounds(sw, ne);
mapCanvas.setCenter(latlng);
mapCanvas.setZoom(10);
var lat, lng, category, json = [];
var categories = ["cat1", "cat2", "cat3"];
// Creating a global infoWindow object that will be reused by all markers
infoWnd = new google.maps.InfoWindow();
// Marker Clusterer setup
clusterer.cat1 = new MarkerClusterer(mapCanvas, [], mcOptions);
clusterer.cat2 = new MarkerClusterer(mapCanvas, [], mcOptions);
clusterer.cat3 = new MarkerClusterer(mapCanvas, [], mcOptions);
google.maps.event.addListener(mapCanvas, 'tilesloaded', function () {
loadMapFromCurrentBounds(mapCanvas);
});
google.maps.event.addListener(mapCanvas, 'rightclick', function(event) {
placeMarker(event.latLng, mapCanvas);
});
google.maps.event.addListener(mapCanvas, 'click', function() {
infoWnd.close();
});
}
加载地图时,会调用 loadMapFromCurrentBounds 函数:
function loadMapFromCurrentBounds(map)
{
// We first remove the markers before updating
for(var i=0; i < markers.length; i++){
markers[i].setMap(null);
}
markers = new Array();
// First, determine the map bounds
var bounds = map.getBounds();
// Then the points
var swPoint = bounds.getSouthWest();
var nePoint = bounds.getNorthEast();
// Now, each individual coordinate
var swLat = swPoint.lat();
var swLng = swPoint.lng();
var neLat = nePoint.lat();
var neLng = nePoint.lng();
var radius = google.maps.geometry.spherical.computeDistanceBetween(swPoint, nePoint);
var center = map.getCenter();
var searchUrl = 'searchdatabase.php5?lat=' + center.lat() + '&lng=' + center.lng() + '&radius=' + radius;
downloadUrl(searchUrl, function(data) {
var xml = parseXml(data);
var markerNodes = xml.documentElement.getElementsByTagName("marker");
var bounds1 = new google.maps.LatLngBounds();
for (var i = 0; i < markerNodes.length; i++)
{
var categorie = markerNodes[i].getAttribute("categorie");
var name = markerNodes[i].getAttribute("name");
var address = markerNodes[i].getAttribute("address");
//var icon = markerNodes[i].getAttribute("typeicon");
var distance = parseFloat(markerNodes[i].getAttribute("distance"));
var latlng = new google.maps.LatLng(
parseFloat(markerNodes[i].getAttribute("lat")),
parseFloat(markerNodes[i].getAttribute("lng"))
);
if ( categorie in markers == false) {
markers[categorie] = [];
}
var marker = createMarker({
idvar : idvar,
idtypelieu : TypeLieu[categorie],
position : latlng,
title : name,
// draggable: true,
icon : categoryIcons[categorie],
description : address,
categorie : categorie,
});
}
})
}
这是createMarker
功能:
function createMarker(options)
{
var marker = new google.maps.Marker(options);
google.maps.event.addListener(marker, "click", function(){
infoWnd.setContent(options.description);
infoWnd.open(mapCanvas, marker);
});
if(mapCanvas.getBounds().contains(marker.getPosition()))
{
var lacategorie = options.categorie;
$("#"+lacategorie).append("<span class=SubList><a href=Lieu-" +options.idvar+ "-"+options.idtypelieu+"-1.html>" + options.title + "</a></span>");
}
markers[options.categorie].push(marker);
return marker;
}
所以我的问题是,每次loadMapFromCurrentBounds
在用户放大或移动地图时调用,都会添加标记但不会替换前一个,因此每个集群在更新时都会增加,并且标记会叠加。
我尝试了几种方法来删除标记,但没有成功。
有人可以帮我找出我的错误在哪里吗?