[SOLVED] How to make MatBadge contain an icon instead of text?

How to make MatBadge contain an icon instead of text?

Using angular/material 6.2.1, I am trying to add a badge to a button, which works fine. However, instead of showing plain text that I can set by using the matBadge directive, I would like the badge to show a material icon instead.

Does anyone know what I have to do to achieve this? I suppose I could use jQuery but I am wondering whether there might be a smoother/easier way to do so.

Solution

There is nothing exposed in their API to achieve it at the moment. You have to manipulate the DOM by yourself:

$0.innerHTML = '<i class="material-icons">check</icon>'

You can write a simple directive to do it in a elegant and reusable way:

@Directive({
  selector: '[matBadgeIcon]'
})
export class MatBadgeIconDirective {

  @Input() matBadgeIcon: string;

  constructor(private el: ElementRef) {}

  ngOnInit() {
    const badge = this.el.nativeElement.querySelector('.mat-badge-content');
    badge.style.display = 'flex';
    badge.style.alignItems = 'center';
    badge.style.justifyContent = 'center';
    badge.innerHTML = `<i class="material-icons" style="font-size: 20px">${this.matBadgeIcon}</i>`;
  }
}

Usage: <div matBadge matBadgeIcon="check">...</div>

Otherwise there is a lot of plain text symbols that you can use like ★✎♥ ,...