我正在使用omdbapi.com API爲電影數據製作一個簡單的搜索引擎。我已經設置了服務獲取數據和組件來創建視圖,但是當我嘗試連接到HTML我得到一個錯誤:如何在從Angular2的外部源獲取JSON之後顯示結果
Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays. Error: Cannot find a differ supporting object '[object Object]' of type 'object'. NgFor only supports binding to Iterables such as Arrays.
電影類
export class Movie {
constructor(
Title: string,
Year: string,
Rated: string,
Released: string,
Runtime: string,
Genre: string,
Director: string,
Writer: string,
Actors: string,
Plot: string,
Language: string,
Country: string,
Awards: string,
Poster: string,
Metascore: string,
imdbRating: string,
imdbVotes: string,
imdbID: string,
Type: string,
Response: string
) {}
}
這裏我的組件:
import { Component, OnInit } from '@angular/core';
import { Http, Response } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import { Subject } from 'rxjs/Subject';
//observable class extensions
import 'rxjs/add/observable/of';
import 'rxjs/add/operator/switchMap';
import 'rxjs/add/operator/map';
//observable operators
import 'rxjs/add/operator/catch';
import 'rxjs/add/operator/debounceTime';
import 'rxjs/add/operator/distinctUntilChanged';
import { MovieSearchService } from './movie-search.service';
import { Movie } from './movie';
@Component({
selector: 'movie-search',
templateUrl: './movie-search.component.html',
styleUrls: ['./movie-search.component.css'],
providers: [MovieSearchService]
})
export class MovieSearchComponent implements OnInit {
movies: Observable<Movie[]>;
private searchTerms = new Subject<string>();
constructor(
private movieSearchService: MovieSearchService,
private http: Http
) {}
search(term:string) {
return this.searchTerms.next(term);
}
ngOnInit(): void {
this.movies = this.searchTerms
.debounceTime(300) // wait 300ms after each keystroke before considering the term
.distinctUntilChanged() // ignore if next search term is same as previous
.switchMap(term => term // switch to new observable each time the term changes
// return the http search observable
? this.movieSearchService.search(term)
// or the observable of empty heroes if there was no search term
: Observable.of<Movie[]>([])
)
.catch(error => {
console.log("--------- Error -------");
console.log(error);
return Observable.of<Movie[]>([]);
})
}
}
這是服務
import { Injectable } from '@angular/core';
import { Http, Jsonp } from '@angular/http';
import { Observable} from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import { Movie } from './movie';
@Injectable()
export class MovieSearchService {
constructor(
private http: Http,
private jsonp: Jsonp
) {}
search(term: string): Observable<Movie[]> {
return this.http
.get(`http://www.omdbapi.com/?s=${term}`)
.map(response => {
return response.json().each() as Movie[]
})
}
}
和視圖
<div class="col-xs-12">
<input #searchBox id="search-box" />
<button (click)="search(searchBox.value)">Search</button>
</div>
<ul *ngIf="movies">
<li *ngFor="let movie of movies">
{{ movie.title }}
</li>
</ul>
我如何可以使視圖顯示每部電影的片名? 預先感謝您的時間。
可能重複[http與Observable在Angular 2不能使用數據](http://stackoverflow.com/questions/41961693/http-with-observable-in-angular-2-cant-use-data) – AngularChef
請發佈API返回的JSON結構示例 –