Angular - Override CSS of swimlane/ngx-datatable

Question

I need to remove the padding from ngx-datatable header cells and body cells.

My actual solution looks like this:

.datatable-body-cell {
  padding: 0 !important;
}

.datatable-header-cell {
  padding-top: 0 !important;
  padding-bottom: 0 !important;
}

calendar.component.scss

@Component({
  templateUrl: './calendar.component.html',
  styleUrls: ['./calendar.component.scss'],
  encapsulation: ViewEncapsulation.None,
  changeDetection: ChangeDetectionStrategy.OnPush,
})

calendar.component.ts

The problem I encountered is that I need to disable the ViewEncapsulation override the ngx-datatable CSS classes datatable-body-cell and datatable-header-cell. Since I use the ngx-datatable in other components as well, the CSS remains overridden when I navigate to the other components. Only when I refresh the CSS in the other components is shown as it should.

Are there any other possibilities to override CSS of a library in a component without affecting the other components?

I'm using Angular 5.

Answer 1

Keep default component encapsulation and use ng-deep

:host ::ng-deep .datatable-body-cell {
  padding: 0 !important;
}

https://angular.io/guide/component-styles#deprecated-deep--and-ng-deep

Answer 2

You could try to do a prefixing/isolation of the css code. That means put e.g. a DIV around the component you want to set a different style and give that DIV a class (prefix-css).

.prefix-css .datatable-body-cell {
  padding: 0 !important;
}

.prefix-css .datatable-header-cell {
  padding-top: 0 !important;
  padding-bottom: 0 !important;
}

The HTML code then looks somehow like that:

<div class="prefix-css">
  ... here the code for your datatable
</div>

You can make that styles global and then just affect code inside of the div with the class 'prefix-css'.

Look at this example: https://stackblitz.com/edit/angular-qlkcs3