Sorting in the TypeScript/Angular table is functioning properly on every column except for the initial one

Even after carefully following the information provided in the official documentation and implementing the example as suggested, I'm still struggling to sort my first column in descending order. Whenever I attempt to sort by another column and then click on the first column, it only sorts in ascending order. Additionally, any updates made to the table seem to be persistent no matter how many times I try sorting the first column.

You can find the project uploaded here: https://stackblitz.com/edit/angular-ivy-6xblrn. Please bear in mind that the layout may not look visually appealing but if you run it on a local machine, the up/down arrow functionality will be visible (I had some difficulty getting StackBlitz to work properly).

angulartypescripthtml-tableangular-material

Answer №1

To ensure automatic sorting in Angular Material, make sure the column name matches the field name of the object in the data array. This is because Angular Material handles all sorting automatically as a form of "syntactic sugar."

The mat-sort-header directive uses the column names to determine which field to use as a reference for sorting.

Here's a working example on StackBlitz: https://stackblitz.com/edit/angular-ivy-njblvd?file=src/app/app.component.html

P.S: Changes made for clarification:

TS:

  displayedColumns: string[] = [
    'id',
    'firstName',
    'lastName',
    'age',
    'gender',
  ];

HTML:

    <ng-container cdkFocusInitial matColumnDef="id">
      <th
        mat-header-cell
        *matHeaderCellDef
        mat-sort-header
        sortActionDescription="Sort by rank"
      >
        No.
      </th>
      <td mat-cell *matCellDef="let element">{{ element.id }}</td>
    </ng-container>

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