HTML5獲取地理位置

時間 2019-12-07

原文原文鏈接

包含了如下功能：
(1)經過IP地址獲取城市地址（並不徹底準確，存在代理IP或IP中轉時定位與實際位置不一致的狀況）
(2)經過移動端瀏覽器及GPS定位位置座標
(3)根據位置座標轉換百度地圖座標
(4)根據位置座標逆推城市具體地址功能（存在必定偏差）
(5)經過使用百度API展現地理位置及添加標註功能
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>地理位置測試</title>
    <script type="text/javascript" src="http://api.map.baidu.com/api?v=1.3"></script>
    <script type="text/javascript"

src="http://developer.baidu.com/map/jsdemo/demo/convertor.js"></script>
    <script type="text/javascript">
        var map;
        var gpsPoint;
        var baiduPoint;
        var gpsAddress;
        var baiduAddress;

        function getLocation() {
            //根據IP獲取城市
            var myCity = new BMap.LocalCity();
            myCity.get(getCityByIP);

            //獲取GPS座標
            if (navigator.geolocation) {
                navigator.geolocation.getCurrentPosition(showMap, handleError, {

enableHighAccuracy: true, maximumAge: 1000 });
            } else {
                alert("您的瀏覽器不支持使用HTML 5來獲取地理位置服務");
            }
        }

        function showMap(value) {
            var longitude = value.coords.longitude;
            var latitude = value.coords.latitude;
            map = new BMap.Map("map");
            //alert("座標經度爲：" + latitude + "，緯度爲：" + longitude );
            gpsPoint = new BMap.Point(longitude, latitude);    // 建立點座標
            map.centerAndZoom(gpsPoint, 15);

            //根據座標逆解析地址
            var geoc = new BMap.Geocoder();
            geoc.getLocation(gpsPoint, getCityByCoordinate);

            BMap.Convertor.translate(gpsPoint, 0, translateCallback);
        }

        translateCallback = function (point) {
            baiduPoint = point;
            var geoc = new BMap.Geocoder();
            geoc.getLocation(baiduPoint, getCityByBaiduCoordinate);
        }

        function getCityByCoordinate(rs) {
            gpsAddress = rs.addressComponents;
            var address = "GPS標註：" + gpsAddress.province + "," + gpsAddress.city + "," +

gpsAddress.district + "," + gpsAddress.street + "," + gpsAddress.streetNumber;
            var marker = new BMap.Marker(gpsPoint); // 建立標註
            map.addOverlay(marker);              // 將標註添加到地圖中
            var labelgps = new BMap.Label(address, { offset: new BMap.Size(20, -10) });
            marker.setLabel(labelgps); //添加GPS標註
        }

        function getCityByBaiduCoordinate(rs) {
            baiduAddress = rs.addressComponents;
            var address = "百度標註：" + baiduAddress.province + "," + baiduAddress.city + ","

+ baiduAddress.district + "," + baiduAddress.street + "," + baiduAddress.streetNumber;
            var marker = new BMap.Marker(baiduPoint); // 建立標註
            map.addOverlay(marker);              // 將標註添加到地圖中
            var labelbaidu = new BMap.Label(address, { offset: new BMap.Size(20, -10) });
            marker.setLabel(labelbaidu); //添加百度標註
        }

        //根據IP獲取城市
        function getCityByIP(rs) {
            var cityName = rs.name;
            alert("根據IP定位您所在的城市爲:" + cityName);
        }

        function handleError(value) {
            switch (value.code) {
                case 1:
                    alert("位置服務被拒絕");
                    break;
                case 2:
                    alert("暫時獲取不到位置信息");
                    break;
                case 3:
                    alert("獲取信息超時");
                    break;
                case 4:
                    alert("未知錯誤");
                    break;
            }
        }

        function init() {
            getLocation();
        }

        window.onload = init;

    </script>
</head>
<body>
    <div id="map" style="width:600px;height:600px;"></div>
</body>
</html>javascript

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