javascript - 删除搜索结果/angular2/typescript/js 中的重复值

Question

我需要删除搜索结果中的重复值。请帮我找到一个简单的解决方案。

我的buyer-search.service.ts:

export class BuyerSearchService {
    constructor(private http: Http) {}
    search(term: string, atrib: string): Observable<Buyer[]> {
        return this.http
            .get(`app/buyers/?${atrib}=${term}`)
            .map((r: Response) => r.json().data as Buyer[]);
    }
}

我的buyer-search.component.ts

export class BuyerSearchComponent implements OnInit {

    buyers: Observable<Buyer[]>;
    private searchTerms = new Subject<string>();
    constructor(
        private buyerSearchService: BuyerSearchService,        
        private router: Router) {}
    // Push a search term into the observable stream.
    search(term: string): void {
        this.searchTerms.next(term);       
    } 

    ngOnInit(): void {
        this.buyers = this.searchTerms
            .debounceTime(300)        // wait for 300ms pause in events
            .distinctUntilChanged()   // ignore if next search term is same as previous
            .switchMap(term => term   // switch to new observable each time
                // return the http search observable
                ? this.buyerSearchService.search(term, 'clientName')
                // or the observable of empty buyers if no search term
                : Observable.of<Buyer[]>([]))
            .catch(error => {
                // TODO: real error handling
                console.log(error);
                return Observable.of<Buyer[]>([]);
            });
    }   
}

和 View ，buyer-search.component.html:

<div id="search-component">
    <input #searchBox id="search-box" (keyup)="search(searchBox.value)"/>  
    <div id="buyerByNameResults">
        <div *ngFor="let buyer of buyers | async"
              class="search-result">
            <p class="buyer-name-s">{{buyer.clientName}}</p>
        </div>
    </div>
</div>

enter image description here

Answer 1

也许您需要对内部可观察对象执行 .distinct() ，并将键选择器传递给第一个参数。

this.buyerSearchService
    .search(term, 'clientName')
    .distinct(function (x) { return x.clientName; });

还有第二个参数，允许您在需要时提供比较器。

https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operators/distinct.md