HTML5中可以通过IP，WIFI信息，GPS，来实现地理定位，当然相关精度也是有所不同，所以如果要精确导航就得使用GPS信息。
下面是一段HTML5结合百度地图API来获取位置的代码：
<div id="allmap"></div>当前定位地址：<a id="du-gps"></a><span></span></div><script>
var map = new BMap.Map("allmap")
var geolocation = new BMap.Geolocation()
geolocation.getCurrentPosition(function(r){
if(this.getStatus() == BMAP_STATUS_SUCCESS){
map.panTo(r.point)
//alert('您的位置：'+r.point.lng+','+r.point.lat)
var pt = r.point
var geoc = new BMap.Geocoder()
geoc.getLocation(pt, function(rs){
var addComp = rs.addressComponents
//alert(addComp.province + ", " + addComp.city + ", " + addComp.district + ", " + addComp.street + ", " + addComp.streetNumber)
$("#du-gps").text(addComp.district+addComp.street+addComp.streetNumber)
})
}
else {
alert('failed'+this.getStatus())
}
},{enableHighAccuracy: true})
</script>
代码如下:/**
* 以下为html5代码,获取地理位置
*/
function getLocation() {
//检查浏览器是否支持地理位置获取
if (navigator.geolocation) {
//若支持地理位置获取,成功调用showPosition(),失败调用showError
// alert("正在努力获取位置...")
var config = { enableHighAccuracy: true, timeout: 5000, maximumAge: 30000 }
navigator.geolocation.getCurrentPosition(showPosition, showError, config)
} else {
//alert("Geolocation is not supported by this browser.")
alert("定位失败,用户已禁用位置获取权限")
}
}
/**
* 获取地址位置成功
*/
function showPosition(position) {
//获得经度纬度
var x = position.coords.latitude
var y = position.coords.longitude
//配置Baidu Geocoding API
var url = "http://api.map.baidu.com/geocoder/v2/?ak=C93b5178d7a8ebdb830b9b557abce78b" +
"&callback=renderReverse" +
"&location=" + x + "," + y +
"&output=json" +
"&pois=0"
$.ajax({
type: "GET",
dataType: "jsonp",
url: url,
success: function (json) {
if (json == null || typeof (json) == "undefined") {
return
}
if (json.status != "0") {
return
}
setAddress(json.result.addressComponent)
},
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert("[x:" + x + ",y:" + y + "]地址位置获取失败,请手动选择地址")
}
})
}
/**
* 获取地址位置失败[暂不处理]
*/
function showError(error) {
switch (error.code) {
case error.PERMISSION_DENIED:
alert("定位失败,用户拒绝请求地理定位")
//x.innerHTML = "User denied the request for Geolocation.[用户拒绝请求地理定位]"
break
case error.POSITION_UNAVAILABLE:
alert("定位失败,位置信息是不可用")
//x.innerHTML = "Location information is unavailable.[位置信息是不可用]"
break
case error.TIMEOUT:
alert("定位失败,请求获取用户位置超时")
//x.innerHTML = "The request to get user location timed out.[请求获取用户位置超时]"
break
case error.UNKNOWN_ERROR:
alert("定位失败,定位系统失效")
//x.innerHTML = "An unknown error occurred.[未知错误]"
break
}
}
/**
* 设置地址
*/
function setAddress(json) {
var position = document.getElementById("txtPosition")
//省
var province = json.province
//市
var city = json.city
//区
var district = json.district
province = province.replace('市', '')
position.value = province + "," + city + "," + district
position.style.color = 'black'
}
