Updating the Mat Table Label Dynamically in Angular

Is there a way to dynamically change the value of a label in an Angular mat table with pagination without recreating the entire table? The goal is to update the header label without having to regenerate the whole table structure. For instance, in the table example below, I would like to modify the "Symbol" header to display as "something" instead. Is this feasible?

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

    <!-- Position Column -->
    <ng-container matColumnDef="position">
      <th mat-header-cell *matHeaderCellDef> No. </th>
      <td mat-cell *matCellDef="let element"> {{element.position}} </td>
    </ng-container>

    <!-- Name Column -->
    <ng-container matColumnDef="name">
      <th mat-header-cell *matHeaderCellDef> Name </th>
      <td mat-cell *matCellDef="let element"> {{element.name}} </td>
    </ng-container>

    <!-- Weight Column -->
    <ng-container matColumnDef="weight">
      <th mat-header-cell *matHeaderCellDef> Weight </th>
      <td mat-cell *matCellDef="let element"> {{element.weight}} </td>
    </ng-container>

    <!-- Symbol Column -->
    <ng-container matColumnDef="symbol">
      <th mat-header-cell *matHeaderCellDef> Symbol </th>
      <td mat-cell *matCellDef="let element"> {{element.symbol}} </td>
    </ng-container>

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

  <mat-paginator [pageSizeOptions]="[5, 10, 20]"
                 showFirstLastButtons 
                 aria-label="Select page of periodic elements">
  </mat-paginator>
</div>

Answer №1

To simplify your code, consider using a variable like this:

<th mat-header-cell *matHeaderCellDef>{{myVariable}}</th> 

In the typescript file (.ts), define your variable like this:

myVariable="Symbol"; // define your variable
// You can also change the variable value anywhere in the code
this.myVariable="Name Changed";

If you don't have specific requirements for column names, you can create an array of headers like this:

headers=[
  {title:"Position",column:"position"},
  {title:"Name",column:"name"},
  {title:"Weight",column:"weight},
  ...
 ]

Then iterate over this array in your HTML template like this:

<ng-container *ngFor="let head of headers"; [matColumnDef]="head.column">
  <th mat-header-cell *matHeaderCellDef> {{head.title}}</th>
  <td mat-cell *matCellDef="let element"> {{element[head.column]}} </td>
</ng-container>

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