显示从 api 获取的数据

Question

我已经从 API 获取了数据，我正试图将它们显示为一个数组。我能够记录请求数据并将它们记录到控制台中。

我无法将它们显示到数组中。

这是我的服务组件：

import {Injectable} from '@angular/core';
import {HttpClient } from '@angular/common/http';



@Injectable({
  providedIn: 'root'
})
export class EarthquakeService {


  constructor(private http: HttpClient) {}

  getEarthquakes(){
    return this.http.get('http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/all_hour.geojson');
  }


}

这是我请求数据的应用程序组件：

import { Component, OnInit } from '@angular/core';

import {EarthquakeService} from '../../services/earthquake/earthquake.service';



@Component({
  selector: 'app-earthquake-page',
  templateUrl: './earthquake-page.component.html',
  styleUrls: ['./earthquake-page.component.scss']
})
export class EarthquakePageComponent implements OnInit {

  earthquakes: string[];
  eathqaukeTitle: string;

  constructor(private earthquakeService: EarthquakeService) {

  }

  ngOnInit() {
    this.getEarthqaukes();


  }

  getEarthqaukes(){
    this.earthquakeService.getEarthquakes().subscribe(
      (response) => console.log(response),
      (error) => console.log(error)
    );
  }

}

现在我不知道如何将这些数据保存到数组中并显示在页面上。

Answer 1

我认为您在发出 http 获取数据的请求时遗漏了一些部分，请尝试以下操作。该请求应该类似于以下内容，无法从图片中很好地计算出 JSON。

请求

import { map } from 'rxjs/operators';
import { Observable } from 'rxjs';


public getEarthquakes(): Observable<any>{
    return this.http.get('http://earthquake.usgs.gov/
      earthquakes/feed/v1.0/summary/all_hour.geojson').pipe(map(data => data));
}

//only on two lines for SO readability

组件

 public earthQuakes = [];    

  getEarthqaukes(){
  this.earthquakeService.getEarthquakes().subscribe(
    (response) => {
       console.log(response)
       this.earthQuakes = response.features; // whichever bit you are looking for.
  },
  (error) => console.log(error)
  );
}

HTML

<div *ngFor="let shake of earthQuakes">
  <span>{{shake}}</span>
</div>

Documentation on using *ngFor.

如前所述，这并不完美 JSON，但这绝对足以填补空白。正如 the head rush you should look through this tutorial 在评论中提到的那样，以确保您在学习时了解自己在做什么。

显示从 api 获取的数据

Display fetched data from api

typescript

angular-http

ngfor

angular

angular-httpclient