javascript - Google map API v3 - 地理编码

Question

我想要一张有 2 个标记的 map 。如果我使用 LatLng(参见 JS 代码/工作正常/)，那没问题...但是一旦我尝试使用地理编码(参见 JS 代码/你不工作？/) 它不起作用。我想这都是错误的:

var adresse3=geocoder.geocode({'address': 'Winkelriedstrasse 47, 6004 Luzern'})[0].geometry.location;

谁能帮帮我。预先感谢您。

var myCenter=new google.maps.LatLng(47.050944,8.309441);
var geocoder;
var map;
function initialize(){  
    var mapProp = {
      center            :myCenter         
    };
    var geocoder = new google.maps.Geocoder();
    var map = new google.maps.Map(document.getElementById("googleMap"),mapProp);
    /*WORKS JUST FINE*/
    var marker1=new google.maps.Marker({
        position: new google.maps.LatLng(47.050944,8.309441)
    });
    marker1.setMap(map);
    var infowindow1 = new google.maps.InfoWindow({
        content:"marker1"
    });
    google.maps.event.addListener(marker1, 'click', function() {
        infowindow1.open(map,marker1);
    });  
    /*Y U NOT WORKING?*/
    var adresse3=geocoder.geocode({'address': 'Winkelriedstrasse 47, 6004 Luzern'})[0].geometry.location;
    var marker3=new google.maps.Marker({
        position: adresse3
    });
    marker3.setMap(map);
    var infowindow3 = new google.maps.InfoWindow({
        content:"marker3"
    });
    google.maps.event.addListener(marker3, 'click', function() {
        infowindow3.open(map,marker3);
    }); 
}
google.maps.event.addDomListener(window, 'load', initialize);

Answer 1

您的问题是 geocoder.geocode 是异步的，因此您必须传递 callback function .

改编自Google Maps Documentation :

geocoder.geocode({'address': 'Winkelriedstrasse 47, 6004 Luzern'}, 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
    });
  } else {
    alert("Geocode was not successful for the following reason: " + status);
  }
});