Question

我试图从HTTP响应 -

中提取生成的JSON中的lat和lng值

  lat: any;
  lng: any;
  geoResult: any;

  public getGeoCoordinates(store) {
    let apiUrl = '/assets/GoogleGeoCoordinates.json';
    this.http.get(apiUrl).subscribe( resp => {
        this.geoResult = resp;
    });
  }

从上面的方法，我试图捕获如下的值

  if (resp['status'] == 'OK' && resp['results']['length'] > 0) {
        this.lat = resp['results'][0]['geometry']['location']['lat'];
        this.lng = resp['results'][0]['geometry']['location']['lng'];
   }

如果我使用alert（），例如提醒（＆＃39;纬度：＆＃39; + resp [＆＃39;结果＆＃39;] [0] [＆＃39;几何＆＃39;] [＆＃39;位置＆＃39;] [＆＃39; LAT＆＃39;]）;

警告显示该值。

如果我将该值存储在＆＃39; this.lat＆＃39;变量，我得到了＃undefined＆＃39;

有人可以帮助我，了解从json HTTP响应中获取值

JSON文件内容 - GoogleGeoCoordinates.json

{
    "results": [
        {
            "address_components": [
                {
                    "long_name": "120",
                    "short_name": "120",
                    "types": [
                        "street_number"
                    ]
                },
                {
                    "long_name": "West 56th Street",
                    "short_name": "W 56th St",
                    "types": [
                        "route"
                    ]
                },
                {
                    "long_name": "Manhattan",
                    "short_name": "Manhattan",
                    "types": [
                        "political",
                        "sublocality",
                        "sublocality_level_1"
                    ]
                },
                {
                    "long_name": "New York",
                    "short_name": "New York",
                    "types": [
                        "locality",
                        "political"
                    ]
                },
                {
                    "long_name": "New York County",
                    "short_name": "New York County",
                    "types": [
                        "administrative_area_level_2",
                        "political"
                    ]
                },
                {
                    "long_name": "New York",
                    "short_name": "NY",
                    "types": [
                        "administrative_area_level_1",
                        "political"
                    ]
                },
                {
                    "long_name": "United States",
                    "short_name": "US",
                    "types": [
                        "country",
                        "political"
                    ]
                },
                {
                    "long_name": "10019",
                    "short_name": "10019",
                    "types": [
                        "postal_code"
                    ]
                }
            ],
            "formatted_address": "120 W 56th St, New York, NY 10019, USA",
            "geometry": {
                "location": {
                    "lat": 40.7640254,
                    "lng": -73.97896
                },
                "location_type": "ROOFTOP",
                "viewport": {
                    "northeast": {
                        "lat": 40.7653743802915,
                        "lng": -73.97761101970849
                    },
                    "southwest": {
                        "lat": 40.7626764197085,
                        "lng": -73.98030898029151
                    }
                }
            },
            "place_id": "ChIJE4YK3PlYwokRybTACneYny4",
            "types": [
                "street_address"
            ]
        }
    ],
    "status": "OK"
}

Answer 1

我已经在'subscribe'之外分配了值，它似乎已经开始工作了。

工作代码如下 -

public getGeoCoordinates(store) {
    let apiUrl = '/assets/GoogleGeoCoordinates.json';

    this.http.get(apiUrl).subscribe( resp => {
        this.geoResult = resp;

        });
    this.lat = this.geoResult['results'][0]['geometry']['location']['lat']; 
    this.lng = this.geoResult['results'][0]['geometry']['location']['lng'];
  }

从HTTP响应中提取数据 - Angular 5

1 个答案: