javascript - 来自 Google Maps Geocoder v3 的返回地址

Question

我有以下功能:

$(function() {
     var address = $("#address").text();
     var r;

     function encodeAddress() {
       geocoder = new google.maps.Geocoder();
       geocoder.geocode({'address' : address}, function(results, status) {
         if (status == google.maps.GeocoderStatus.OK) {
           results[0].geometry.location
           r = results[0].geometry.location
           console.log("inside:" + r);
         } else {
           alert("Google Maps had some trouble finding" + address + status);
         }
       });
     }

    encodeAddress()
    console.log("outside:" + r);
});

我正在尝试返回用于街景和 Gmap 的地理编码地址。内部返回正确的值，外部返回未定义的值。

非常感谢所有帮助，我确实在其他地方读到过不可能以这种方式返回值，但必须向可信赖的 StackOverflow 社区核实。

提前谢谢你。

Answer 1

您可以这样做，并在 Geocode 的回调函数中调用 outputGeo 函数。基本上，您在 Geocode 回调之前访问 r，因此 r 仍未定义:

$(function() {
     var address = $("address").text();
     var r;

     function encodeAddress() {
       geocoder = new google.maps.Geocoder();
       geocoder.geocode({'address' : address}, function(results, status) {
         if (status == google.maps.GeocoderStatus.OK) {
           results[0].geometry.location;
           r = results[0].geometry.location;
           outputGeo(r);
         } else {
           alert("Google Maps had some trouble finding" + address + status);
         }
       });
     }

    encodeAddress();
    function outputGeo(result){
         console.log("outside:" + result);
    }
});

---

这里解释了地理编码服务的工作原理。

Accessing the Geocoding service is asynchronous, since the Google Maps API needs to make a call to an external server. For that reason, you need to pass a callback method to execute upon completion of the request. This callback method processes the result(s). Note that the geocoder may return more than one result.