Search code examples
angularngfor

Filtering items by value inside ngFor without writing Pipes

I have the following Component:

class MyComponent {
  public mode = 'v';
  readonly modes = ['v', 'a', 'd'];
  ....
}

Now I want to use an ngFor to display buttons for all modes in modes except the current mode stored in mode. I have the following code:

<button *ngFor="let othermode of modes">
  {{ othermode }}
</button>

I always want two buttons to be displayed, containing the remaining 2 modes. I tried this:

<button *ngFor="let othermode of modes.filter(elem => elem !== this.mode)">
  {{ othermode }}
</button>

but it isn't working. All questions I saw required to write a custom pipe for this feature, but isn't there any simple way to filter an array of strings, using just the values ?

Solution

  • You can use :

    <ng-container *ngFor="let othermode of modes">
  <button *ngIf="othermode!=mode">
    {{ othermode }}
  </button>
</ng-container>