我有一个很简单的JS使用navigator。geolocation。getcurrentposition jammy。
$(document).ready(function(){
$("#business-locate, #people-locate").click(function() {
navigator.geolocation.getCurrentPosition(foundLocation, noLocation);
});
navigator.geolocation.getCurrentPosition(foundLocation, noLocation);
function foundLocation(position) {
var lat = position.coords.latitude;
var lon = position.coords.longitude;
var userLocation = lat + ', ' + lon;
$("#business-current-location, #people-current-location").remove();
$("#Near-Me")
.watermark("Current Location")
.after("<input type='hidden' name='business-current-location' id='business-current-location' value='"+userLocation+"' />");
$("#people-Near-Me")
.watermark("Current Location")
.after("<input type='hidden' name='people-current-location' id='people-current-location' value='"+userLocation+"' />");
}
function noLocation() {
$("#Near-Me").watermark("Could not find location");
$("#people-Near-Me").watermark("Could not find location");
}
})//end DocReady
基本上,这里发生的事情是我们得到当前位置,如果它得到了,两个“水印”被放置在两个字段中,表示“当前位置”,两个隐藏字段被创建,并使用latong数据作为它们的值(它们在开始时被删除,这样它们就不会每次都重复)。还有两个按钮,它们有一个点击功能,做同样的事情。
不幸的是,每隔三次左右,它就会奏效。
这里有什么问题?
大家也一样,顺便说一句,这在Chrome(稳定,开发和金丝雀)中工作完美,只是在FF和Safari中不合适。它在我的iPhone和iPad上也很好用(Safari!)这可能是由于这个功能相对较新(即它是一个bug)。我现在花了差不多一个星期的时间在这个上面,我就是不能让它在那些浏览器上工作
以下是我的发现:
第一次调用getCurrentPosition时,它工作得很完美。任何后续调用都不会返回,也就是说,它不会触发successCallback或errorCallback函数。为了证明我的观点,我在看涨期权中添加了几个仓位选项:
navigator.geolocation.getCurrentPosition(successCallback, errorCallback, {timeout: 10000});
并且每次都超时(在第一次成功调用之后)。我认为我可以用maximumAge来修复它,但这似乎并不像它应该工作的那样工作:
navigator.geolocation.getCurrentPosition(successCallback, errorCallback, {maximumAge:60000, timeout: 2000});
这应该防止实际调用getCurrentPosition函数,如果你在60秒内调用它,但它忽略了这一点(然而,这可能是因为我实际上刷新了我的页面来触发第二次调用,不确定这是否持久跨调用)
顺便说一句,即使谷歌的例子失败在这些浏览器上,这让我相信这确实是浏览器的bug,尝试一下,在Safari中加载两次,第二次就不会工作了。
如果有人找到了解决方案,请告诉我:-)
欢呼。
我发现,这种方法行不通
navigator.geolocation.getCurrentPosition(function() {...}, function(err) {...}, {});
But
这种方法非常有效
function storeCoordinates(position) {
console.log(position.coords.latitude, position.coords.longitude);
}
function errorHandler() {...}
navigator.geolocation.getCurrentPosition(storeCoordinates, errorHandler, { enableHighAccuracy: true, timeout: 20000, maximumAge: 0 });
我也遇到了同样的情况。我尝试了超时解决方案,但不可靠。我发现如果你只调用它两次,位置就会正确刷新
function getLocation(callback)
{
if(navigator.geolocation)
{
navigator.geolocation.getCurrentPosition(function(position)
{
navigator.geolocation.getCurrentPosition(callback, function(){},{maximumAge:0, timeout:10000});
},function(){}, {maximumAge:0, timeout:10000});
}
return true;
}
这当然是有点慢,但我没有给我错误的位置一次。我有它击中超时几次,没有返回任何东西,但除此之外,它工作得很好。我知道这仍然有点老套,我期待有人找到真正的解决方案。
或者,如果你想确保它会一直尝试,直到你想放弃,你可以试试这样的方法。
//example
$(document).ready(function(){
getLocation(function(position){
//do something cool with position
console.log(position);
});
});
var GPSTimeout = 10; //init global var NOTE: I noticed that 10 gives me the quickest result but play around with this number to your own liking
//function to be called where you want the location with the callback(position)
function getLocation(callback)
{
if(navigator.geolocation)
{
var clickedTime = (new Date()).getTime(); //get the current time
GPSTimeout = 10; //reset the timeout just in case you call it more then once
ensurePosition(callback, clickedTime); //call recursive function to get position
}
return true;
}
//recursive position function
function ensurePosition(callback, timestamp)
{
if(GPSTimeout < 6000)//set at what point you want to just give up
{
//call the geolocation function
navigator.geolocation.getCurrentPosition(
function(position) //on success
{
//if the timestamp that is returned minus the time that was set when called is greater then 0 the position is up to date
if(position.timestamp - timestamp >= 0)
{
GPSTimeout = 10; //reset timeout just in case
callback(position); //call the callback function you created
}
else //the gps that was returned is not current and needs to be refreshed
{
GPSTimeout += GPSTimeout; //increase the timeout by itself n*2
ensurePosition(callback, timestamp); //call itself to refresh
}
},
function() //error: gps failed so we will try again
{
GPSTimeout += GPSTimeout; //increase the timeout by itself n*2
ensurePosition(callback, timestamp);//call itself to try again
},
{maximumAge:0, timeout:GPSTimeout}
)
}
}
我可能在这里有一些打字和拼写错误,但我希望你能明白。如果有人有问题或者找到更好的建议,请告诉我。
以下是我的解决方案,感谢一个闭包:
function geoloc(success, fail){
var is_echo = false;
if(navigator && navigator.geolocation) {
navigator.geolocation.getCurrentPosition(
function(pos) {
if (is_echo){ return; }
is_echo = true;
success(pos.coords.latitude,pos.coords.longitude);
},
function() {
if (is_echo){ return; }
is_echo = true;
fail();
}
);
} else {
fail();
}
}
function success(lat, lng){
alert(lat + " , " + lng);
}
function fail(){
alert("failed");
}
geoloc(success, fail);