通常，地名（例如孟买）有不同的名称显示在Google地图中 - 例如孟买马哈拉施特拉邦，孟买印度或孟买。
我们如何识别它是同一个地方（不依赖于已知变化的坐标）？像我可以用来查看我的应用程序的唯一键或字符串名称？
答案 0 :(得分：1)
此密钥存在。它是Place ID的名称。地点ID对于世界上的每个地址都是唯一的。您可以使用此功能将地址转换为地点ID：
var request = {
location: map.getCenter(),
radius: '500',
query: 'Google Sydney'
};
var service = new google.maps.places.PlacesService(map);
service.textSearch(request, callback);
// Checks that the PlacesServiceStatus is OK, and adds a marker
// using the place ID and location from the PlacesService.
function callback(results, status) {
if (status == google.maps.places.PlacesServiceStatus.OK) {
console.log (results[0].place_id);
var marker = new google.maps.Marker({
map: map,
place: {
placeId: results[0].place_id,
location: results[0].geometry.location
}
});
}
}
这是另一个可能相当复杂的例子：
// This sample uses the Place Autocomplete widget to allow the user to search
// for and select a place. The sample then displays an info window containing
// the place ID and other information about the place that the user has
// selected.
// This example requires the Places library. Include the libraries=places
// parameter when you first load the API. For example:
// <script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&libraries=places">
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
center: {lat: -33.8688, lng: 151.2195},
zoom: 13
});
var input = document.getElementById('pac-input');
var autocomplete = new google.maps.places.Autocomplete(input);
autocomplete.bindTo('bounds', map);
map.controls[google.maps.ControlPosition.TOP_LEFT].push(input);
var infowindow = new google.maps.InfoWindow();
var marker = new google.maps.Marker({
map: map
});
marker.addListener('click', function() {
infowindow.open(map, marker);
});
autocomplete.addListener('place_changed', function() {
infowindow.close();
var place = autocomplete.getPlace();
if (!place.geometry) {
return;
}
if (place.geometry.viewport) {
map.fitBounds(place.geometry.viewport);
} else {
map.setCenter(place.geometry.location);
map.setZoom(17);
}
// Set the position of the marker using the place ID and location.
marker.setPlace({
placeId: place.place_id,
location: place.geometry.location
});
marker.setVisible(true);
document.getElementById('place-name').textContent = place.name;
document.getElementById('place-id').textContent = place.place_id;
document.getElementById('place-address').textContent =
place.formatted_address;
infowindow.setContent(document.getElementById('infowindow-content'));
infowindow.open(map, marker);
});
} /* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
.controls {
background-color: #fff;
border-radius: 2px;
border: 1px solid transparent;
box-shadow: 0 2px 6px rgba(0, 0, 0, 0.3);
box-sizing: border-box;
font-family: Roboto;
font-size: 15px;
font-weight: 300;
height: 29px;
margin-left: 17px;
margin-top: 10px;
outline: none;
padding: 0 11px 0 13px;
text-overflow: ellipsis;
width: 400px;
}
.controls:focus {
border-color: #4d90fe;
}
.title {
font-weight: bold;
}
#infowindow-content {
display: none;
}
#map #infowindow-content {
display: inline;
} <input id="pac-input" class="controls" type="text"
placeholder="Enter a location">
<div id="map"></div>
<div id="infowindow-content">
<span id="place-name" class="title"></span><br>
Place ID <span id="place-id"></span><br>
<span id="place-address"></span>
</div>
<script src="https://maps.googleapis.com/maps/api/js?libraries=places&callback=initMap"
async defer></script>
这是使用地点ID进行反向地理编码的另一个示例：
// Initialize the map.
function initMap() {
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 8,
center: {lat: 40.72, lng: -73.96}
});
var geocoder = new google.maps.Geocoder;
var infowindow = new google.maps.InfoWindow;
document.getElementById('submit').addEventListener('click', function() {
geocodePlaceId(geocoder, map, infowindow);
});
}
// This function is called when the user clicks the UI button requesting
// a reverse geocode.
function geocodePlaceId(geocoder, map, infowindow) {
var placeId = document.getElementById('place-id').value;
geocoder.geocode({'placeId': placeId}, function(results, status) {
if (status === 'OK') {
if (results[0]) {
map.setZoom(11);
map.setCenter(results[0].geometry.location);
var marker = new google.maps.Marker({
map: map,
position: results[0].geometry.location
});
infowindow.setContent(results[0].formatted_address);
infowindow.open(map, marker);
} else {
window.alert('No results found');
}
} else {
window.alert('Geocoder failed due to: ' + status);
}
});
} /* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html, body {
height: 100%;
margin: 0;
padding: 0;
}
#floating-panel {
position: absolute;
top: 10px;
left: 25%;
z-index: 5;
background-color: #fff;
padding: 5px;
border: 1px solid #999;
text-align: center;
font-family: 'Roboto','sans-serif';
line-height: 30px;
padding-left: 10px;
}
#floating-panel {
width: 440px;
}
#place-id {
width: 250px;
} <div id="floating-panel">
<!-- Supply a default place ID for a place in Brooklyn, New York. -->
<input id="place-id" type="text" value="ChIJd8BlQ2BZwokRAFUEcm_qrcA">
<input id="submit" type="button" value="Reverse Geocode by Place ID">
</div>
<div id="map"></div>
<script async defer
src="https://maps.googleapis.com/maps/api/js?callback=initMap">
</script>
这一切都有点复杂......
您可以访问google开发人员网站以获取更多信息：
如果您不理解，或者您有任何问题或意见，请告诉我。