如何从Google Geocoding API中仅获取administrative_area_level_2？

Question

我试图从Google地理位置API结果中仅获取县名.不幸的是,县并不总是在结果的同一地点,所以我需要通过识别键来抓住它administrative_area_level_2

这是我的电话:

$.getJSON( {
    url  : 'http://maps.googleapis.com/maps/api/geocode/json?latlng=' + position.coords.latitude + ',' + position.coords.longitude + '&sensor=true',
    data : {
        sensor  : false
    },
    success : function( data, textStatus ) {
        var county = data.results[0].address_components[4].long_name;
        alert('County: ' + county);
    }
});

这适用于我所在的县,但不适用于其他县,因为address_components[4]并不总是县.然而,我确实注意到该县始终与之相关administrative_area_level_2

这是一个示例响应:

{
   "results" : [
      {
         "address_components" : [
            {
               "long_name" : "Edge of Everglades Trail",
               "short_name" : "Edge of Everglades Trail",
               "types" : [ "route" ]
            },
            {
               "long_name" : "Homestead",
               "short_name" : "Homestead",
               "types" : [ "locality", "political" ]
            },
            {
               "long_name" : "Miami-Dade County",
               "short_name" : "Miami-Dade County",
               "types" : [ "administrative_area_level_2", "political" ]
            },
            {
               "long_name" : "Florida",
               "short_name" : "FL",
               "types" : [ "administrative_area_level_1", "political" ]
            },
            {
               "long_name" : "United States",
               "short_name" : "US",
               "types" : [ "country", "political" ]
            },
            {
               "long_name" : "33031",
               "short_name" : "33031",
               "types" : [ "postal_code" ]
            }
         ],
... 

我如何获得与administrative_area_level_2类型相关联的"long_name" ？

Answer 1

为了administrative_area_level_2从地址组件数组中获取,您可以使用Array.prototype.filter()和Array.prototype.includes()函数.

var filtered_array = data.results[0].address_components.filter(function(address_component){
    return address_component.types.includes("administrative_area_level_2");
}); 
var county = filtered_array.length ? filtered_array[0].long_name: "";

您也可以administrative_area_level_2使用反向地理编码直接搜索

$.getJSON( {
    url  : 'http://maps.googleapis.com/maps/api/geocode/json?latlng=' + position.coords.latitude + ',' + position.coords.longitude + '&result_type=administrative_area_level_2',
    data : {
        sensor  : false
    },
    success : function( data, textStatus ) {
        var filtered_array = data.results[0].address_components.filter(function(address_component){
            return address_component.types.includes("administrative_area_level_2");
        }); 
        var county = filtered_array.length ? filtered_array[0].long_name: "";
        alert('County: ' + county);
    }
});

我希望这有帮助!