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Reverse Geocode on Client Side (Google Maps V3 API)

开发者 https://www.devze.com 2023-03-17 08:19 出处:网络
How do you do a Reverse Geocode on the clientside using Google Maps V3 API? The 开发者_JS百科forward geocode from address to LatLng is straight forward (code below), but how do you do the same for rev

How do you do a Reverse Geocode on the clientside using Google Maps V3 API? The 开发者_JS百科forward geocode from address to LatLng is straight forward (code below), but how do you do the same for reverse geocode?

Normal Geocode Code:

geocoder = new google.maps.Geocoder();
geocoder.geocode( { 'address': address}, function(results, status) {
  if (status == google.maps.GeocoderStatus.OK) {
    map.setCenter(results[0].geometry.location);
    var marker = new google.maps.Marker({
    map: map,
    position: results[0].geometry.location
  });


The process is exactly the same, with the minor difference that instead of supplying an address object to the geocode function you supply a LatLng object

Reverse Geocode Code:

var input = document.getElementById("latlng").value;
var latlngStr = input.split(",",2);
var lat = parseFloat(latlngStr[0]);
var lng = parseFloat(latlngStr[1]);
var latlng = new google.maps.LatLng(lat, lng);

geocoder.geocode({'latLng': latlng}, function(results, status) {
  if (status == google.maps.GeocoderStatus.OK) {
    if (results[1]) {
      map.setZoom(11);
      marker = new google.maps.Marker({
          position: latlng, 
          map: map
      }); 
      infowindow.setContent(results[1].formatted_address);
      infowindow.open(map, marker);
    } else {
      alert("No results found");
    }
  } else {
    alert("Geocoder failed due to: " + status);
  }
});

Example directly from Google

Hope that helps.

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