javascript - 如何使用 Angular5 Material2 从 api 填充数据？

Question

下面我添加了“table.component.html”和“table.component.ts”。 我正在从 API 获取数据。我想将这些数据填充到数据表中。

下面我添加了我的对象，该对象是我从 API 接收的)

[
  {position: 1, name: 'Hydrogen', weight: 1.0079, symbol: 'H'},
  {position: 2, name: 'Helium', weight: 4.0026, symbol: 'He'},
  {position: 3, name: 'Lithium', weight: 6.941, symbol: 'Li'},
  {position: 4, name: 'Beryllium', weight: 9.0122, symbol: 'Be'},
  {position: 5, name: 'Boron', weight: 10.811, symbol: 'B'},
];

现在我对上面的对象进行了硬编码，但我想从 API 填充数据。

import {MediaMatcher} from '@angular/cdk/layout';
import { Component, OnInit, ViewEncapsulation,ViewChild,ChangeDetectorRef,Inject} from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { ActivatedRoute, Router } from '@angular/router';
import {MatPaginator, MatSort, MatTableDataSource,MatDialog, MatDialogRef, MAT_DIALOG_DATA} from '@angular/material';

@Component({

  selector: 'app-table',

  templateUrl: './table.component.html',

  styleUrls: ['./table.component.css']

})



export class TableComponent {

  displayedColumns = ['position', 'name', 'weight', 'symbol'];

  dataSource = new MatTableDataSource<Element>(ELEMENT_DATA);

   items: any;

  @ViewChild(MatPaginator) paginator: MatPaginator;
  constructor(private router: Router, private route: ActivatedRoute, private http: HttpClient,public dialog: MatDialog) { }
  ngOnInit() {

    this.http.get('/item').subscribe(data => {

      console.log("data>>>>>",data);

      this.items = data;

    });

  }

  ngAfterViewInit() {

    this.dataSource.paginator = this.paginator;

  }

}



export interface Element {

  name: string;

  position: number;

  weight: number;

  symbol: string;

}



const ELEMENT_DATA: Element[] = [
  {position: 1, name: 'Hydrogen', weight: 1.0079, symbol: 'H'},
  {position: 2, name: 'Helium', weight: 4.0026, symbol: 'He'},
  {position: 3, name: 'Lithium', weight: 6.941, symbol: 'Li'},
  {position: 4, name: 'Beryllium', weight: 9.0122, symbol: 'Be'},
  {position: 5, name: 'Boron', weight: 10.811, symbol: 'B'},
];

我的 HTML:

<div class="example-container mat-elevation-z8">

  <mat-table #table [dataSource]="dataSource">



    <!-- Position Column -->

    <ng-container matColumnDef="position">

      <mat-header-cell *matHeaderCellDef> No. </mat-header-cell>

      <mat-cell *matCellDef="let element"> {{element.position}} </mat-cell>

    </ng-container>



    <!-- Name Column -->

    <ng-container matColumnDef="name">

      <mat-header-cell *matHeaderCellDef> Name </mat-header-cell>

      <mat-cell *matCellDef="let element"> {{element.name}} </mat-cell>

    </ng-container>



    <!-- Weight Column -->

    <ng-container matColumnDef="weight">

      <mat-header-cell *matHeaderCellDef> Weight </mat-header-cell>

      <mat-cell *matCellDef="let element"> {{element.weight}} </mat-cell>

    </ng-container>



    <!-- Symbol Column -->

    <ng-container matColumnDef="symbol">

      <mat-header-cell *matHeaderCellDef> Symbol </mat-header-cell>

      <mat-cell *matCellDef="let element"> {{element.symbol}} </mat-cell>

    </ng-container>



    <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row>

    <mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row>

  </mat-table>



  <mat-paginator #paginator

                 [pageSize]="10"

                 [pageSizeOptions]="[5, 10, 20]">

  </mat-paginator>

</div>

Answer 1

您需要将从后端获取的新数据传递给将加载到表中的数据源。

在您的组件中更改此:

dataSource = new MatTableDataSource<Element>(ELEMENT_DATA);

至:

dataSource = new MatTableDataSource<Element>();

然后您需要在其中输入新数据(假设您的数据与硬编码的数据具有相同的格式，位置，名称，重量和符号):

ngOnInit() {

    this.http.get('/item').subscribe(data => {

      console.log("data>>>>>",data);

      this.items = data;

      this.dataSource.data = this.itens;
    });

  }