高精度地理定位Html5

Question

我想找到一个使用嵌入式GPS的设备(如应用程序共享位置).我已经读过它可能了enableHighAccuracy: true.

我enableHighAccuracy: true该如何设置此代码？我试过不同的位置,但它不起作用.

<script type="text/javascript">
    if (navigator.geolocation) {
        navigator.geolocation.getCurrentPosition(function(position) {
            var latitude = position.coords.latitude;
            var longitude = position.coords.longitude;
            var accuracy = position.coords.accuracy;
            var coords = new google.maps.LatLng(latitude, longitude);
            var mapOptions = {
                zoom: 15,
                center: coords,
                mapTypeControl: true,
                navigationControlOptions: {
                    style: google.maps.NavigationControlStyle.SMALL
                },
                mapTypeId: google.maps.MapTypeId.ROADMAP
            };

            var capa = document.getElementById("capa");
            capa.innerHTML = "latitude: " + latitude + ", longitude: " + ", accuracy: " + accuracy;  

            map = new google.maps.Map(document.getElementById("mapContainer"), mapOptions);
            var marker = new google.maps.Marker({
                position: coords,
                map: map,
                title: "ok"
            });
        });

    } else {
        alert("Geolocation API is not supported in your browser.");
    }

</script>

Answer 1

您需要一个PositionOptions对象,在API中设置高精度标志.

我在这里引用:http://diveintohtml5.info/geolocation.html

getCurrentPosition()函数有一个可选的第三个参数,一个PositionOptions对象.您可以在PositionOptions对象中设置三个属性.所有属性都是可选的.您可以设置任何或全部或不设置它们.

POSITIONOPTIONS OBJECT

Property            Type        Default         Notes
--------------------------------------------------------------
enableHighAccuracy  Boolean     false           true might be slower
timeout             long        (no default)    in milliseconds
maximumAge          long        0               in milliseconds

所以,它应该像这样工作:

if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(function(position) {
        var latitude = position.coords.latitude;
        var longitude = position.coords.longitude;
        var accuracy = position.coords.accuracy;
        var coords = new google.maps.LatLng(latitude, longitude);
        var mapOptions = {
            zoom: 15,
            center: coords,
            mapTypeControl: true,
            navigationControlOptions: {
                style: google.maps.NavigationControlStyle.SMALL
            },
            mapTypeId: google.maps.MapTypeId.ROADMAP
        };

        var capa = document.getElementById("capa");
        capa.innerHTML = "latitude: " + latitude + ", longitude: " + ", accuracy: " + accuracy;

        map = new google.maps.Map(document.getElementById("mapContainer"), mapOptions);
        var marker = new google.maps.Marker({
            position: coords,
            map: map,
            title: "ok"
        });

    },
    function error(msg) {alert('Please enable your GPS position feature.');},
    {maximumAge:10000, timeout:5000, enableHighAccuracy: true});
} else {
    alert("Geolocation API is not supported in your browser.");
}

注意到我添加了以下2个参数来getCurrentPosition调用:

1. function error(msg){alert('Please enable your GPS position future.');}

   无法检索GPS或触发超时时调用此功能.

2. {maximumAge:10000, timeout:5000, enableHighAccuracy: true});

   这些是选项.我们不希望gps数据超过10秒(maximumAge:10000).我们不希望等待超过5秒的响应(timeout:5000),我们希望启用高精度(enableHighAccuracy: true).

另请参阅:地理定位HTML5 enableHighAccuracy True,False还是Best Option？

Answer 2

这是enableHighAccuracy: true取自Mozilla Developer Network的简单示例。

var options = {
  enableHighAccuracy: true,
  timeout: 5000,
  maximumAge: 0
};

function success(pos) {
  var crd = pos.coords;

  console.log('Your current position is:');
  console.log(`Latitude : ${crd.latitude}`);
  console.log(`Longitude: ${crd.longitude}`);
  console.log(`More or less ${crd.accuracy} meters.`);
}

function error(err) {
  console.warn(`ERROR(${err.code}): ${err.message}`);
}

navigator.geolocation.getCurrentPosition(success, error, options);