高得地图js api，你地理编码的异步延时

来源：互联网发布：网络趣事排行编辑：程序博客网时间：2024/04/29 18:08

高得地图js api，你地理编码的异步延时问题，

1.如果只有一对坐标点时没有延时，

2.而当多对坐标点的数组时就会有一种延时，并且遍历时，数组次序会乱的情况。

参考网址：http://lbs.amap.com/api/webservice/guide/api/georegeo/

参考例子：http://lbs.amap.com/api/javascript-api/example/geocoder/regeocoding

解决的方法是：一种：在遍历时，在index等于长度时给其加上一种延时1秒，来获取这块。

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<link href="css/special.css" rel="stylesheet" />
<link href="css/demo.Default.css" rel="stylesheet" />
<link href="css/home.css?v=1.5" rel="stylesheet" />
<script src="js/jquery-1.8.3.min.js"></script>
<script src="js/special.js"></script>
<script src="js/es5.min.js"></script>
<script src="http://webapi.amap.com/maps?v=1.3&key=你自己的key"></script>
</head>
<body onLoad="mapInit()">
<div id="iCenter"></div>
<div id="iControlbox">
<ul>
<li>
<input type="text" id="key_11" value="116.51413" />
<input type="text" id="key_12" value="39.912896" />
<button onclick="javascript:geocoder2();">逆地址解析</button>
</li>
</ul>
</div>
<div id="result" style="height:400px;"></div>
</body>
<script type="text/javascript">
var mapObj;
var MGeocoder;
var marker = [];
function mapInit() {
mapObj = new AMap.Map('iCenter'); //默认定位：初始化加载地图时，center及level属性缺省，地图默认显示用户所在城市范围
};
var addressArr = [];
var addressStr = "";
//坐标转地址
var json = [{ "lngX": "117.1419139142", "latY": "39.1157409540" }, { "lngX": "117.183078", "latY": "39.121749" }, { "lngX": "117.183078", "latY": "39.121749" }, { "lngX": "117.183078", "latY": "39.121749" }];
var jsonArray = [];
for (var i = 0 ; i < json.length; i++) {
jsonArray[i] = json[i];
}
//console.log(typeof (jsonArray));

function geocoder2() { //POI搜索，关键字查询
var getLen = jsonArray.length;
$.each(jsonArray, function (index, item) {
var getlngX = parseFloat(item.lngX); //
var getlatY = parseFloat(item.latY); //
var arr_dingwei = GPS.gcj_encrypt(getlatY, getlngX); //定位，将gps坐标转成火星坐标
getlngX = arr_dingwei.lon.toFixed(6);
getlatY = arr_dingwei.lat.toFixed(6);
var lnglatXY = new AMap.LngLat(getlngX, getlatY);
//加载地理编码插件
mapObj.plugin(["AMap.Geocoder"], function () {
MGeocoder = new AMap.Geocoder({
city: "010" //城市，默认：“全国”
});
//返回逆地理编码结果
AMap.event.addListener(MGeocoder, "complete", getAddress_CallBack);
//逆地理编码
MGeocoder.getAddress(lnglatXY);
});
////加点
var marker = new AMap.Marker({
map: mapObj,
icon: "http://webapi.amap.com/images/0.png",
position: lnglatXY,
offset: new AMap.Pixel(-5, -30)
});
mapObj.setFitView();

var index2 = index + 1;

if (index2 == getLen) {
setTimeout(function () {
//alert(json.length);
console.log(addressStr);
}, 1000)
}

});
}

//回调函数
function getAddress_CallBack(data) {
var resultStr = "";
var address;
//返回地址描述
address = data.regeocode.formattedAddress;
//alert(address);
addressStr += address+",";
//addressArr.push(address);
//返回地址结果拼接输出
resultStr = "<div style=\"font-size: 12px;padding:0px 0 4px 2px; border-bottom:1px solid #C1FFC1;\">" + "<b>地址</b>：" + address + "</div>";

$("#result").append(resultStr);
}

//几种坐标的转换
var GPS = {
PI: 3.14159265358979324,
x_pi: 3.14159265358979324 * 3000.0 / 180.0,
delta: function (lat, lon) {
var a = 6378245.0; // a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
var ee = 0.00669342162296594323; // ee: 椭球的偏心率。
var dLat = this.transformLat(lon - 105.0, lat - 35.0);
var dLon = this.transformLon(lon - 105.0, lat - 35.0);
var radLat = lat / 180.0 * this.PI;
var magic = Math.sin(radLat);
magic = 1 - ee * magic * magic;
var sqrtMagic = Math.sqrt(magic);
dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * this.PI);
dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * this.PI);
return { 'lat': dLat, 'lon': dLon };
},
//WGS－84原始坐标系 to GCJ-02火星坐标系
gcj_encrypt: function (wgsLat, wgsLon) {
if (this.outOfChina(wgsLat, wgsLon))
return { 'lat': wgsLat, 'lon': wgsLon };
var d = this.delta(wgsLat, wgsLon);
return { 'lat': wgsLat + d.lat, 'lon': wgsLon + d.lon };
},
//GCJ-02火星坐标系 to WGS－84原始坐标系 exactly
gcj_decrypt_exact: function (gcjLat, gcjLon) {
var initDelta = 0.01;
var threshold = 0.000000001;
var dLat = initDelta, dLon = initDelta;
var mLat = gcjLat - dLat, mLon = gcjLon - dLon;
var pLat = gcjLat + dLat, pLon = gcjLon + dLon;
var wgsLat, wgsLon, i = 0;
while (1) {
wgsLat = (mLat + pLat) / 2;
wgsLon = (mLon + pLon) / 2;
var tmp = this.gcj_encrypt(wgsLat, wgsLon)
dLat = tmp.lat - gcjLat;
dLon = tmp.lon - gcjLon;
if ((Math.abs(dLat) < threshold) && (Math.abs(dLon) < threshold))
break;
if (dLat > 0) pLat = wgsLat; else mLat = wgsLat;
if (dLon > 0) pLon = wgsLon; else mLon = wgsLon;
if (++i > 10000) break;
}
return { 'lat': wgsLat, 'lon': wgsLon };
},
outOfChina: function (lat, lon) {
if (lon < 72.004 || lon > 137.8347)
return true;
if (lat < 0.8293 || lat > 55.8271)
return true;
return false;
},
transformLat: function (x, y) {
var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
ret += (20.0 * Math.sin(6.0 * x * this.PI) + 20.0 * Math.sin(2.0 * x * this.PI)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(y * this.PI) + 40.0 * Math.sin(y / 3.0 * this.PI)) * 2.0 / 3.0;
ret += (160.0 * Math.sin(y / 12.0 * this.PI) + 320 * Math.sin(y * this.PI / 30.0)) * 2.0 / 3.0;
return ret;
},
transformLon: function (x, y) {
var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
ret += (20.0 * Math.sin(6.0 * x * this.PI) + 20.0 * Math.sin(2.0 * x * this.PI)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(x * this.PI) + 40.0 * Math.sin(x / 3.0 * this.PI)) * 2.0 / 3.0;
ret += (150.0 * Math.sin(x / 12.0 * this.PI) + 300.0 * Math.sin(x / 30.0 * this.PI)) * 2.0 / 3.0;
return ret;
}
};
</script>
</html>

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