我正在尝试在谷歌地图上绘制数百个建筑足迹。但我遇到了回调问题（我认为）......
为此，在加载 Google 地图后，我从数据库中获取建筑物 ID 的列表，并为每个 ID 创建一个新的建筑物对象。
主页
function load_buildings() {
var url='/api/get_imaged_buildings/';
$.getJSON(url, function(buildings) {
for(var building in buildings) {
var new_building = new Building(buildings[building].id, buildings[building].footprint);
}
})
.error(function(jqXhr, textStatus, error) {
alert("ERROR: " + textStatus + ", " + error);
});
}
返回：
{"507ca17f0f53664a62000fc0": {"footprint": [[-71.06344334281945, 42.354043084935846], [-71.0637134471212, 42.35412603649889], [-71.06333405397038, 42.35480611690739], [-71.06338439864643, 42.35482782501911], [-71.0632517948924, 42.355064458152995], [-71.063047338961, 42.35496617995809], [-71.06308636758757, 42.35492158377903], [-71.06293828848663, 42.35485043826673], [-71.06289913717758, 42.354895213988364], [-71.06272577376158, 42.35481190819347], [-71.06319845721484, 42.35438624633442], [-71.06344334281945, 42.354043084935846]], "id": "507ca17f0f53664a62000fc0"},
构建.js
function Building(id, footprint) {
this.id = id;
this.footprint = footprint;
}
Building.prototype.plotFootprint = function() {
var footprint = [];
var footprint_from_db = this.footprint;
for(var i=0; i<footprint_from_db.length; i++)
{
var location = footprint_from_db[i];
var point = new google.maps.LatLng(location[0], location[1]);
bounds.extend(point);
footprint.push(point);
}
var building = new google.maps.Polyline({
path: footprint,
strokeColor: '#e81971',
strokeOpacity: 1.0,
strokeWeight: 2
});
building.setMap(map);
}
我想要做的是在所有建筑物都加载后绘制所有建筑物。做这个的最好方式是什么？我想优化速度。
谢谢。
编辑：我取出了错误的代码并使用了有效的方法。现在我想知道如何确定何时将所有足迹加载到所有对象中，然后我应该在哪里绘制它们。