Angular 2 更新数据库中的记录后视图未更新

Question

我有一个使用 Angular 的简单 CRUD 应用程序 2. 主页显示用户可以创建、编辑或删除的卡片列表。

在卡片编辑页面，当我点击提交时，它调用：

卡-edit.component.ts

onSubmit() {
        this.updateCard(this.card);

        alert("Card updated!");        
        this._router.navigate(['/CardList']);
    }

updateCard(updatedCard: Card) {
        // call to card.service.ts
        this._cardService.updateCard(updatedCard)
            .subscribe(
            result => this.response = result,
            error => this.errorMessage = <any>error);
    }

card.service.ts

updateCard(updatedCard: Card): Observable<string> {
        let body = JSON.stringify(updatedCard);
        let headers = new Headers({ 'Content-Type': 'application/json' });
        let options = new RequestOptions({ headers: headers });

        return this._http.put(this._cardUrl + "/" + updatedCard.id, body, options)
            .map(this.extractData)
            .catch(this.handleError);
    }

卡片已在数据库中更新。然后路由器将我带回卡片列表。

卡-list.component.ts

import { Component, OnInit} from 'angular2/core'
import { ROUTER_DIRECTIVES } from 'angular2/router'

import { Card } from './card'
import { CardService } from './card.service'
import { CardFilterPipe } from './card-filter.pipe'


@Component({
    templateUrl: 'app/card/card-list.component.html',
    directives: [ROUTER_DIRECTIVES],
    pipes: [CardFilterPipe]
})

export class CardListComponent implements OnInit {
    pageTitle: string = 'Card List';
    cards: Card[];
    errorMessage: string;
    listFilter: string;

    constructor(private _cardService: CardService) { }

    ngOnInit(): void {
        this.getCards();   
    }

    getCards() {
        this._cardService.getCards()
            .subscribe(
            result => this.cards = result,
            error => this.errorMessage = <any>error);
    }

}

问题： 我刚刚在编辑页面上所做的更改没有反映在列表视图中。需要整页刷新才能获取反映最新数据的记录。

Answer 1

我想我明白了。看来我必须在 updateCard() 而不是 onSubmit() 中调用路由器导航。

updateCard(updatedCard: Card) {
        // call to service to update record in database
        this._cardService.updateCard(updatedCard)
            .subscribe(
            result => this.response = result,
            error => this.errorMessage = <any>error,
            () => this._router.navigate(['CardList'])
            );
}

Angular 2 更新数据库中的记录后视图未更新

Angular 2 view not updating after I update a record in the database

angular

rxjs

observable

angular2-routing

angular2-template