我在这里完全不解.我有一个对象列表,每个对象包含一个位置.我使用google.maps.geocoder查找此位置,然后我在地图上放置了该位置的标记.
但由于某种原因,只出现一个标记.我想这与我在这里的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,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.
更新：为了避免第一个答案中建议的循环闭包,我已将代码更改为：
//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(),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,results[0].geometry.location);
} else {
console.log("Geocode Failed " + status);
}
}
}
function addMarker(map,location) {
console.log("Setting marker for " + item.location + " (location: " + location + ")");
var marker = new google.maps.Marker({ map : map,300)
});
new google.maps.event.addListener(marker,function() {
infowindow.open(map,marker);
});
}
根据日志语句,我现在在正确的位置有正确的对象,这意味着每次设置标记时项目和位置对象都不同,但我仍然只在地图上得到一个标记.怎么会这样？
解决方法
不要在循环中创建闭包.
That just won’t work.这可能是解决问题的方法：
function callback() {
return function(results,results[0].geometry.location);
} else {
console.log("Geocode Failed " + status);
}
};
}
for (var item in list) {
var geocoder = new google.maps.Geocoder();
var geoOptions = {
address: item.location,callback());
}
