CODEWITHSUNDEEP
angulartypescriptangular-materialangular-material-table
netdjw
netdjw

Reputation: 6007

Missing definitions for header, footer, and row; cannot determine which columns should be rendered - Angular Material Table

I'm using Angular 9.0.4 with @angular/material 9.1.3 and I want to show a basic material table:

<table mat-table [dataSource]="devizas" class="mat-elevation-z8">
  <!-- name -->
  <ng-container matColumnDef="name">
    <th mat-header-cell *matHeaderCellDef>Name</th>
    <td mat-cell *matCellDef="let element"> {{ element.name }} </td>
  </ng-container>

  <!-- code -->
  <ng-container matColumnDef="code">
    <th mat-header-cell *matHeaderCellDef>Code</th>
    <td mat-cell *matCellDef="let element"> {{ element.code }} </td>
  </ng-container>
</table>

I imported in my app.module.ts this:

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

@NgModule({
  imports: [
    MatTableModule,
  ],
})

In my component.ts:

export class DevizaListComponent implements OnInit {
  devizas: DevizaInterface[] = [
    {
      name: 'dollar',
      code: 'USD' ,
    }
  ];

  constructor() { }

  ngOnInit() { }
}

Now I get this error message in the browser:

Error: Missing definitions for header, footer, and row; cannot determine which columns should be rendered. at getTableMissingRowDefsError (table.js:996) at MatTable.push../node_modules/@angular/cdk/ivy_ngcc/fesm5/table.js.CdkTable.ngAfterContentChecked (table.js:1296)

The official documentation says nothing relevant. Any idea?

Upvotes: 20

Views: 43045

Answers (3)

Gabriel Arghire
Gabriel Arghire

Reputation: 2360

Make sure you place the tags right above table

Make sure that

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

and

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

is right above table element.

This will work:

<table mat-table [dataSource]="devizas" class="mat-elevation-z8">
 ....

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

This will NOT work:

<table mat-table [dataSource]="devizas" class="mat-elevation-z8">
  <div>
   ....

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

Upvotes: 1

programoholic
programoholic

Reputation: 5194

You are missing below line in html code : 

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

  1. create an array with column definitions as below in component.ts file :

    columndefs : any[] = ['name','code'];

  2. Update table code as below : 

<table mat-table [dataSource]="devizas" class="mat-elevation-z8">
          <ng-container matColumnDef="name">
            <th mat-header-cell *matHeaderCellDef>Name</th>
            <td mat-cell *matCellDef="let element"> {{ element.name }} </td>
          </ng-container>
        
          <ng-container matColumnDef="code">
            <th mat-header-cell *matHeaderCellDef>Code</th>
            <td mat-cell *matCellDef="let element"> {{ element.code }} </td>
          </ng-container>
        
          <tr mat-header-row *matHeaderRowDef="columndefs"></tr>
          <tr mat-row *matRowDef="let row; columns: columndefs;"></tr>
        
        </table>

Here is the demo : demo

Upvotes: 12

vargaadam
vargaadam

Reputation: 489

Try this!

<table mat-table [dataSource]="devizas" class="mat-elevation-z8">
 ....

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

Upvotes: 22

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