角度:无错误，但不在材料表中显示数据

Question

我的控制台中没有错误，但无法在材料数据表中显示它。在代码中查找了一段时间，但无法弄清楚。我唯一想到的是 API 不正确。xxxxx 表示 API 的一些 URL。统一不允许我显示真正的链接。

餐厅.服务.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
import { Restaurant } from '../models/restaurant.model';
@Injectable({
  providedIn: 'root'
})
export class RestaurantService {
  private restaurantsUrl = 'https://xxxxxx/getAllServices.php';
  constructor(private http: HttpClient) { }
  getRestaurants(): Observable<Restaurant[]> {
    return this.http.get<Restaurant[]>(this.restaurantsUrl);
  }
}

restaurant-table.component.ts

import { Component, ViewChild,OnInit } from '@angular/core';
import { RestaurantService } from '../services/restaurant.service';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/of';
import {DataSource} from '@angular/cdk/collections';
import { Restaurant } from '../models/restaurant.model';

@Component({
  selector: 'app-restaurants-table',
  templateUrl: './restaurants-table.component.html',
  styleUrls: ['./restaurants-table.component.css']
})
export class RestaurantsTableComponent implements OnInit {
  dataSource = new RestaurantDataSource(this.restaurantService);
  displayedColumns = ['id', 'ime_restorana', 'opis', 'broj_telefona', 'adresa_restorana','edits'];
  constructor(private restaurantService: RestaurantService) {
}
  ngOnInit() {
  }
}
export class RestaurantDataSource extends DataSource<any> {
  constructor(private restaurantService: RestaurantService) {
    super();
  }
  connect(): Observable<Restaurant[]> {
    return this.restaurantService.getRestaurants();
  }
  disconnect() {}
}

餐厅-表.组件.html

<div class="">
  <mat-table [dataSource]="dataSource">
    <ng-container matColumnDef="id">
      <mat-header-cell *matHeaderCellDef> ID </mat-header-cell>
      <mat-cell *matCellDef="let restaurant"> {{ restaurant.id }} </mat-cell>
    </ng-container>
    <ng-container matColumnDef="ime_restorana">
      <mat-header-cell *matHeaderCellDef> Naziv </mat-header-cell>
      <mat-cell *matCellDef="let restaurant"> {{ restaurant.ime_restorana }} </mat-cell>
    </ng-container>
    <ng-container matColumnDef="opis">
      <mat-header-cell *matHeaderCellDef> Opis </mat-header-cell>
      <mat-cell *matCellDef="let restaurant"> {{ restaurant.opis }} </mat-cell>
    </ng-container>
    <ng-container matColumnDef="broj_telefona">
      <mat-header-cell *matHeaderCellDef> Broj Telefona </mat-header-cell>
      <mat-cell *matCellDef="let restaurant"> {{ restaurant.broj_telefona }} </mat-cell>
    </ng-container>
    <ng-container matColumnDef="adresa_restorana">
      <mat-header-cell *matHeaderCellDef> Adresa </mat-header-cell>
      <mat-cell *matCellDef="let restaurant"> {{ restaurant.adresa_restorana }} </mat-cell>
    </ng-container>
    <ng-container matColumnDef="edits">
      <th mat-header-cell *matHeaderCellDef></th>   
      <td mat-cell *matCellDef="let element"> 
        <button mat-raised-button class="edit-btn"><mat-icon>edit</mat-icon></button> 
        <button mat-raised-button class="edit-btn"><mat-icon>remove_red_eye</mat-icon></button> 
      </td>
    </ng-container>
    <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>
    <mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>
  </mat-table>
</div>

和用户模型

export interface User {
    name: string;
    email: string;
    phone: string;
    company: {
        name: string;
    }
}

Answer 1

您当前的dataSource是RestaurantDataSource类的一个实例，您想要的(我想(是餐厅的实际列表，因此

dataSource = new RestaurantDataSource(this.restaurantService).connect();

但是，connect() 方法返回 Observable，而不是列表本身，因此需要在模板中使用 async 管道

<mat-table [dataSource]="dataSource | async">