Can't bind to 'dataSource' since it is

Question

I am new in angular 5 development. I am trying to develop a data table with angular material using the example provided here: "https://material.angular.io/components/table/examples".

I am getting an error saying Can't bind to 'dataSource' since it isn't a known property of 'table'.

Please help.

Answer 1

Please see your dataSource varibale doesn't get the data from the server or dataSource is not assigned to the expected format of data.

Answer 2

Thanx to @Jota.Toledo, I got the solution for my table creation. Please find the working code below:

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: [
    BrowserModule,
    BrowserAnimationsModule,
    FormsModule,
    ReactiveFormsModule,
    HttpClientModule,
    AppRoutingModule,
    MatCardModule,
    MatProgressSpinnerModule,
    MatMenuModule,
    MatIconModule,
    MatToolbarModule,
    MatButtonModule,
    MatFormFieldModule,
    MatInputModule,
    MatSelectModule,
    MatSortModule,
    MatTableModule
  ],

Answer 3

Remember to import the MatTableModule module and remove the table element show below for reference.
wrong implementation
<table mat-table [dataSource]=”myDataArray”> ... </table>
correct implementation:
<mat-table [dataSource]="myDataArray"> </mat-table>

Answer 4

• Angular Core v6.0.2,
• Angular Material, v6.0.2,
• Angular CLI v6.0.0 (globally v6.1.2)

I had this issue when running ng test, so to fix it, I added to my xyz.component.spec.ts file:

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

And added it to imports section in TestBed.configureTestingModule({}):

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

Answer 5

Remember to add MatTableModule in your app.module's imports

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

Answer 6

The problem is your angular material version, I have the same, and I have resolved this when I have installed the good version of angular material in local.

Hope it solve yours too.