[英]Google Maps API Centered Marker + Geolocation
我試着寫變量來嘗試並放置一個標記,但它不起作用。 首先應該要求啟用位置服務,然后使用標記顯示用戶的當前位置。 我不確定是否必須單獨調用變量“marker”? 或者語法有問題嗎?
我究竟做錯了什么?
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>GMAP</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Google Maps API -->
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0}
#map-canvas { height: 100%; margin-left:auto; margin-right:auto; }
</style>
<script type="text/javascript"
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCUuNJkdVKOzHyIclOyTki6uHwrYpKxaeg&sensor=true">
</script>
<!-- GMaps GPS -->
<script src="https://maps.googleapis.com/maps/api/js?v=3.exp&sensor=true"></script>
<script type="text/javascript">
function initialize() {
var mapOptions = {
zoom: 6
};
map = new google.maps.Map(document.getElementById('map-canvas'),
mapOptions);
// Try HTML5 geolocation
if(navigator.geolocation) {
navigator.geolocation.getCurrentPosition( function (position) {
var pos = new google.maps.LatLng(position.coords.latitude,
position.coords.longitude);
var showPosition = function (position) {
var userLatLng = new google.maps.LatLng(position.coords.latitude, position.coords.longitude);
var marker = new google.maps.Marker({
position: userLatLng,
title: 'Your Location',
map: map
});
var infowindow = new google.maps.InfoWindow({
map: map,
position: pos,
});
map.setCenter(pos);
};
});
}
else {
// Browser doesn't support Geolocation
handleNoGeolocation(false);
}
}
function handleNoGeolocation(errorFlag) {
if (errorFlag) {
var content = 'Error: The Geolocation service failed.';
} else {
var content = 'Error: Your browser doesn\'t support geolocation.';
}
var options = {
map: map,
position: new google.maps.LatLng(37.774929, -122.419416),
content: content
};
var infowindow = new google.maps.InfoWindow(options);
map.setCenter(options.position);
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<!-- Current Location Google Map API -->
<br />
<div id="map-canvas" style="width: 30%; height: 30%"></div>
</body>
</html>
有兩個錯誤。
Google Maps API包含兩次,因此我們會收到消息: Warning: you have included the Google Maps API multiple times on this page. This may cause unexpected errors.
Warning: you have included the Google Maps API multiple times on this page. This may cause unexpected errors.
其中一個包含的鏈接必須被注釋掉。
下一個是缺少調用showPosition()
函數。 即使你在那里調用它也無法工作,因為變量使用pos
和userLatLng
,應該更正。 這是更改的代碼:
...
navigator.geolocation.getCurrentPosition( function (position) {
//var pos = new google.maps.LatLng(position.coords.latitude,
// position.coords.longitude);
//var showPosition = function (position) {
var userLatLng = new google.maps.LatLng(position.coords.latitude,
position.coords.longitude);
var marker = new google.maps.Marker({
position: userLatLng,
title: 'Your Location',
map: map
});
var infowindow = new google.maps.InfoWindow({
// map: map,
content: 'Info for this place',
position: userLatLng
});
map.setCenter(userLatLng);
//};
}, function (err) {
// message if user denied geolocation
alert('Error(' + err.code + '): ' + err.message);
});
} else {
...
Infowindow不會被打開,因為沒有標記的事件監聽器。
你需要調用showPosition
函數,你現在只是聲明它。
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