不能绑定到“dataSource”，因为它不是表的已知属性

Question

我是新的角5发展。我正试图使用这里提供的示例"https://material.angular.io/components/table/examples“开发一个带有角材料的数据表。

我说Can't bind to 'dataSource' since it isn't a known property of 'table'.时出错了

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请帮帮忙。

Answer 1

感谢@Jota.Toledo，我找到了创建表的解决方案。请查找以下工作代码：

component.html

<mat-table #table [dataSource]="dataSource" matSort>
  <ng-container matColumnDef="{{column.id}}" *ngFor="let column of columnNames">
    <mat-header-cell *matHeaderCellDef mat-sort-header> {{column.value}}</mat-header-cell>
    <mat-cell *matCellDef="let element"> {{element[column.id]}}</mat-cell>
  </ng-container>

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

component.ts

import { Component, OnInit, ViewChild } from '@angular/core';
import { MatTableDataSource, MatSort } from '@angular/material';
import { DataSource } from '@angular/cdk/table';

@Component({
  selector: 'app-m',
  templateUrl: './m.component.html',
  styleUrls: ['./m.component.css'],
})
export class MComponent implements OnInit {

  dataSource;
  displayedColumns = [];
  @ViewChild(MatSort) sort: MatSort;

  /**
   * Pre-defined columns list for user table
   */
  columnNames = [{
    id: 'position',
    value: 'No.',

  }, {
    id: 'name',
    value: 'Name',
  },
    {
      id: 'weight',
      value: 'Weight',
    },
    {
      id: 'symbol',
      value: 'Symbol',
    }];

  ngOnInit() {
    this.displayedColumns = this.columnNames.map(x => x.id);
    this.createTable();
  }

  createTable() {
    let tableArr: 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' },
      { position: 6, name: 'Carbon', weight: 12.0107, symbol: 'C' },
    ];
    this.dataSource = new MatTableDataSource(tableArr);
    this.dataSource.sort = this.sort;
  }
}

export interface Element {
  position: number,
  name: string,
  weight: number,
  symbol: string
}

app.module.ts

imports: [
  MatSortModule,
  MatTableModule,
],

Answer 2

记住在您的MatTableModule中添加app.module's imports，即

角9+

import { MatTableModule } from '@angular/material/table'  

@NgModule({
  imports: [
    // ...
    MatTableModule
    // ...
  ]
})

小于角度9

import { MatTableModule } from '@angular/material'  

@NgModule({
  imports: [
    // ...
    MatTableModule
    // ...
  ]
})

Answer 3

• 角芯v6.0.2，
• 角材料，v6.0.2，
• 角CLI v6.0.0 (全局v6.1.2)

我在运行ng test时遇到了这个问题，因此为了解决这个问题，我在xyz.component.spec.ts文件中添加了以下内容：

import { MatTableModule } from '@angular/material';

并将其添加到imports节中的TestBed.configureTestingModule({})中。

beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports: [ ReactiveFormsModule, HttpClientModule, RouterTestingModule, MatTableModule ],
      declarations: [ BookComponent ],
      schemas: [ CUSTOM_ELEMENTS_SCHEMA ]
    })
    .compileComponents();
}));