我在这里完全困惑了。我有一个对象列表,每个对象都包含一个位置。我使用 google.maps.geocoder 查找这个位置,然后在地图上为该位置放置一个标记。
但由于某种原因,只出现一个标记。我想这与我在其他线程中看到的闭包问题有关,但我似乎无法将解决方案应用于我所拥有的。
我的代码如下:
var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
map.fitBounds(bounds);
for (var item in list) {
var geocoder = new google.maps.Geocoder();
var geoOptions = {
address: item.location,
bounds: bounds,
region: "NO"
};
geocoder.geocode(geoOptions, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
addMarker(map, item, results[0].geometry.location);
} else {
console.log("Geocode failed " + status);
}
});
}
function addMarker(map, item, location) {
var marker = new google.maps.Marker({ map : map, position : location});
marker.setTitle(item.title);
var infowindow = new google.maps.InfoWindow( {
content : item.body,
size : new google.maps.Size(100, 300)
});
(function(map, marker) {
new google.maps.event.addListener(marker, "click", function() {
infowindow.open(map, marker);
});
})(map, marker);
}
任何帮助表示赞赏。
Update:为了避免第一个答案中建议的循环闭包,我将代码更改为:
//This is the entry
function codeLocations(list, map) {
for (var i = 0; i < list.length; i++) {
console.log("Looping " + list[i].location);
var geocoder = new google.maps.Geocoder();
var geoOptions = {
address: list[i].location,
bounds: getBounds(),
region: "NO"
};
geocoder.geocode(geoOptions, createGeocodeCallback(list[i], map));
}
}
function createGeocodeCallback(item, map) {
console.log("Generating geocode callback for " + item.location);
return function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
console.log("Geocoding " + item.location + " OK");
addMarker(map, item, results[0].geometry.location);
} else {
console.log("Geocode failed " + status);
}
}
}
function addMarker(map, item, location) {
console.log("Setting marker for " + item.location + " (location: " + location + ")");
var marker = new google.maps.Marker({ map : map, position : location});
marker.setTitle(item.title);
var infowindow = new google.maps.InfoWindow( {
content : item.body,
size : new google.maps.Size(100, 300)
});
new google.maps.event.addListener(marker, "click", function() {
infowindow.open(map, marker);
});
}
根据日志语句,我现在在正确的位置拥有正确的对象,这意味着每次设置标记时,项目和位置对象都是不同的,但我在地图上仍然只得到一个标记。怎么会这样?