反向地理编码v3
问题描述：
我无法使此代码正常工作。我正在做的是使用地理位置获取设备的lat和lng值，将其保存在变量pos中并且它可以工作。我能够在警报窗口中查看这些值。我无法工作的是反向地理编码。它不会使用变量pos中的值返回任何地址。反向地理编码v3
<!DOCTYPE html>
<html>
<head>
<title>Geolocation</title>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<style>
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 50%;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
var pos=[];
var geocoder = new google.maps.Geocoder;
var infowindow = new google.maps.InfoWindow;
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
center: {lat: -34.397, lng: 150.644},
zoom: 16
});
// Try HTML5 geolocation.
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
pos = {
lat: position.coords.latitude,
lng: position.coords.longitude
};
alert(position.coords.latitude+" "+position.coords.longitude);
geocodeLatLng(geocoder, map, infowindow);
map.setCenter(pos);
}, function() {
handleLocationError(true, infoWindow, map.getCenter());
});
} else {
// Browser doesn't support Geolocation
handleLocationError(false, infoWindow, map.getCenter());
}
}
function handleLocationError(browserHasGeolocation, infoWindow, pos) {
infoWindow.setPosition(pos);
infoWindow.setContent(browserHasGeolocation ?
'Error: The Geolocation service failed.' :
'Error: Your browser doesn\'t support geolocation.');
}
function geocodeLatLng(geocoder, map, infowindow) {
geocoder.geocode({'location': pos}, function(results, status) {
if (status === google.maps.GeocoderStatus.OK) {
if (results[1]) {
map.setZoom(11);
var marker = new google.maps.Marker({
position: pos,
map: map
});
infowindow.setContent(results[1].formatted_address);
infowindow.open(map, marker);
} else {
window.alert('No results found');
}
} else {
window.alert('Geocoder failed due to: ' + status);
}
});
}
</script>
<script src="https://maps.googleapis.com/maps/api/js?callback=initMap"
async defer>
</script>
</body>
</html>
答
<script src="https://maps.googleapis.com/maps/api/js?callback=initMap"
async defer>
</script>
要异步加载API，你不能使用，直到回调运行的API（内部和initMap运行之后，而不是之前）
代码片段：
var pos = [];
var geocoder;
var infoWindow;
var map;
function initMap() {
geocoder = new google.maps.Geocoder();
infoWindow = new google.maps.InfoWindow();
map = new google.maps.Map(document.getElementById('map'), {
center: {
lat: -34.397,
lng: 150.644
},
zoom: 15
});
// Try HTML5 geolocation.
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
pos = {
lat: position.coords.latitude,
lng: position.coords.longitude
};
// alert(position.coords.latitude + " " + position.coords.longitude);
geocodeLatLng(geocoder, map, infoWindow, pos);
map.setCenter(pos);
}, function() {
handleLocationError(true, infoWindow, map.getCenter());
});
} else {
// Browser doesn't support Geolocation
handleLocationError(false, infoWindow, map.getCenter());
}
}
function handleLocationError(browserHasGeolocation, infoWindow, pos) {
infoWindow.setPosition(pos);
infoWindow.setContent(browserHasGeolocation ?
'Error: The Geolocation service failed.' :
'Error: Your browser doesn\'t support geolocation.');
}
function geocodeLatLng(geocoder, map, infowindow, pos) {
document.getElementById('info').innerHTML = pos.lat.toFixed(6) + "," + pos.lng.toFixed(6);
geocoder.geocode({
'location': pos
}, function(results, status) {
if (status === google.maps.GeocoderStatus.OK) {
if (results[0]) {
map.setZoom(11);
var marker = new google.maps.Marker({
position: pos,
map: map
});
infowindow.setContent(results[1].formatted_address);
infowindow.open(map, marker);
} else {
window.alert('No results found');
}
} else {
window.alert('Geocoder failed due to: ' + status);
}
});
}html,
body {
height: 100%;
margin: 0;
padding: 0;
}
#map {
height: 50%;
}<script src="https://maps.googleapis.com/maps/api/js?callback=initMap" async defer></script>
<div id="info"></div>
<div id="map"></div>+0
现在我明白了。谢谢。 ：d – RJDO
嗨，没有足够的信息，因为我们没有看到谁叫'geocodeLatLng'函数，我们看不到'pos'是否在你的范围内可用 – Saar
@Saar嗨，我已经添加了更多的代码。我真的无法让它工作。我正在调用navigator.geolocation.getCurrentPosition（） – RJDO
Owww中的geocodeLatLng函数..我在外面声明了变量geocoder和infowindow。我试着把它们放在initMap（）里面，现在就开始工作。感谢您的帮助@Saar – RJDO