/**
* 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';
}