为什么我无法从谷歌地图地点 API 的标记中获取坐标？

Question

我想在谷歌地图中的标记移动到另一个位置时从它获取纬度和经度。

我已经搜索并找到了答案，但我真的不知道我做错了什么。当您选择搜索结果地址时，我可以获取坐标，但是当标记拖放到新位置时，坐标不会改变......

<script>
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
center: {lat: 38.241997, lng: 21.736244},
zoom: 13
});
var card = document.getElementById('pac-card');
var input = document.getElementById('pac-input');
var types = document.getElementById('type-selector');
var strictBounds = document.getElementById('strict-bounds-selector');
map.controls[google.maps.ControlPosition.TOP_RIGHT].push(card);
var autocomplete = new google.maps.places.Autocomplete(input);
// Bind the map's bounds (viewport) property to the autocomplete object,
// so that the autocomplete requests use the current map bounds for the
// bounds option in the request.
autocomplete.bindTo('bounds', map);
// Set the data fields to return when the user selects a place.
autocomplete.setFields(
['address_components', 'geometry', 'icon', 'name']);
var infowindow = new google.maps.InfoWindow();
var infowindowContent = document.getElementById('infowindow-content');
infowindow.setContent(infowindowContent);
var marker = new google.maps.Marker({
map: map,
draggable: true,
anchorPoint: new google.maps.Point(0, -29)
});
google.maps.event.addListener(marker, 'dragend', function() {
document.getElementById('Lat').value = marker.getPosition().lat();
document.getElementById('Lng').value = marker.getPosition().lng();
});
autocomplete.addListener('place_changed', function() {
infowindow.close();
marker.setVisible(true);
var place = autocomplete.getPlace();
document.getElementById('Lat').value = place.geometry.location.lat();
document.getElementById('Lng').value = place.geometry.location.lng();
if (!place.geometry) {
window.alert("No details available for input: '" + place.name + "'");
return;
}
// If the place has a geometry, then present it on a map.
if (place.geometry.viewport) {
map.fitBounds(place.geometry.viewport);
} else {
map.setCenter(place.geometry.location);
map.setZoom(17);  // Why 17? Because it looks good.
}
marker.setPosition(place.geometry.location);
marker.setVisible(true);

var address = '';
if (place.address_components) {
address = [
(place.address_components[0] && place.address_components[0].short_name || ''),
(place.address_components[1] && place.address_components[1].short_name || ''),
(place.address_components[2] && place.address_components[2].short_name || '')
].join(' ');
}
infowindowContent.children['place-icon'].src = place.icon;
infowindowContent.children['place-name'].textContent = place.name;
infowindowContent.children['place-address'].textContent = address;
infowindow.open(map, marker);
});

document.getElementById('use-strict-bounds')
.addEventListener('click', function() {
console.log('Checkbox clicked! New state=' + this.checked);
autocomplete.setOptions({strictBounds: this.checked});
});
}

</script>

然后，我以两种形式输入(Lat 和 Lng(分配坐标，但我不会发布该代码，因为我确定没有问题。正如我告诉你的place_changed它工作得很好。只有标记拖放，什么都不会发生。谢谢。

Answer 1

使用它来获取坐标

var item_lat = place.geometry.location.lat();
var item_lng = place.geometry.location.lng();
var getloc = place.name;
alert("Lat "+item_lat+ "___Lng "+item_lng + " Location "+getloc);