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显示从api获取的数据

angular-httpclient angular-http angular

Matt · 技术社区 · 6 年前

我能够记录请求数据并将它们记录到控制台中。

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');
  }


}

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在页面上显示它们。

2 回复 | 直到 6 年前

devDan 6 年前

我想你在做你的衣服时少了一些零件 http 请求获取数据,请尝试以下操作。请求应该与下面的内容类似,不能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

组成部分

 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格式

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

Documentation on using *ngFor

这并不像前面提到的那样完美,不能很好地看到完整的JSON,但这肯定足以填补空白。正如 the head rush 你应该看看这个 tutorial 确保你在学习的过程中了解自己在做什么。