Nog我有以下页面，其中包含前往预定义目的地的说明：
example directions
使用以下代码可以完美工作：
<body>
<h3>My Google Maps Demo</h3>
<div id="map"></div>
<script>
function initMap() {
var directionsDisplay = new google.maps.DirectionsRenderer;
var directionsService = new google.maps.DirectionsService;
var lattp = <?php echo json_encode($lattp);?>;
var lngtp = <?php echo json_encode($lngtp);?>;
var zoomtp = <?php echo json_encode($zoomtp);?>;
var tp = {lat: JSON.parse(lattp), lng: JSON.parse(lngtp)};
var map = new google.maps.Map(document.getElementById('map'), {
zoom: JSON.parse(zoomtp),
center: tp
});
directionsDisplay.setMap(map);
calculateAndDisplayRoute(directionsService, directionsDisplay);
}
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
var pos = {
lat: position.coords.latitude,
lng: position.coords.longitude
};
}, function() {
handleLocationError(true, markerme);
});
} else {
// Browser doesn't support Geolocation
window.alert('Geolocation is not supported');
}
function calculateAndDisplayRoute(directionsService, directionsDisplay) {
var latrest = <?php echo json_encode($latrest);?>;
var lngrest = <?php echo json_encode($lngrest);?>;
var rest = {lat: JSON.parse(latrest), lng: JSON.parse(lngrest)};
//var selectedMode = "WALKING";
directionsService.route({
origin: {lat: 51.203278, lng: 2.758969}, // current position.
destination: rest, // restaurant.
// Note that Javascript allows us to access the constant
// using square brackets and a string value as its
// "property."
travelMode: google.maps.TravelMode.WALKING
}, function(response, status) {
if (status == 'OK') {
directionsDisplay.setDirections(response);
} else {
window.alert('Directions request failed due to ' + status);
}
});
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyBWTXOkLL3td_c8oQni-qi74ICSypn7GM8&callback=initMap">
</script>
</body>
如您所见，我尝试将当前职位作为起点。
我已经尝试获取变量
pos作为原点，但这不起作用...就连Google指南对我来说也不清楚。
感谢您的帮助！
最佳答案
您的当前位置是在另一个函数中声明的，因此其他函数基本上看不到它。
navigator.geolocation.getCurrentPosition(function(position) {
var pos = {
lat: position.coords.latitude,
lng: position.coords.longitude
};
}, function() {
handleLocationError(true, markerme);
});
我建议计算您在
initMap内的位置，然后将当前位置作为参数传递给calculateAndDisplayRoute。function initMap() {
...
var map = new google.maps.Map(document.getElementById('map'), {
zoom: JSON.parse(zoomtp),
center: tp
});
directionsDisplay.setMap(map);
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(function(position) {
var pos = {
lat: position.coords.latitude,
lng: position.coords.longitude
};
calculateAndDisplayRoute(directionsService, directionsDisplay, pos);
}, function() {
handleLocationError(true, markerme);
});
} else {
// Browser doesn't support Geolocation
window.alert('Geolocation is not supported');
}
}
function calculateAndDisplayRoute(directionsService, directionsDisplay, pos) {
var latrest = <?php echo json_encode($latrest);?>;
var lngrest = <?php echo json_encode($lngrest);?>;
var rest = {lat: JSON.parse(latrest), lng: JSON.parse(lngrest)};
//var selectedMode = "WALKING";
directionsService.route({
origin: pos, // current position.
destination: rest, // restaurant.
// Note that Javascript allows us to access the constant
// using square brackets and a string value as its
// "property."
travelMode: google.maps.TravelMode.WALKING
}, function(response, status) {
if (status == 'OK') {
directionsDisplay.setDirections(response);
} else {
window.alert('Directions request failed due to ' + status);
}
});
}