gistfile1.txt

//Component
import { Component, Input} from '@angular/core';

@Component({
  selector: 'iwdf-ui-button-spinner',
  template: `
    <ng-container *ngIf="has; else elseTemplate">
      <div class="loader">Loading...</div>
    </ng-container>
    <ng-template #elseTemplate>
      <span>{{value}}</span>
    </ng-template>
  `,
  styleUrls: ['./button-spinner.component.scss']
}) 
export class IwdfButtonSpinnerComponent {
    @Input() value: string;
    @Input() has: boolean;
}

//Scss
.loader,
.loader::before,
.loader::after {
  width: 1.5em;
  height: 1.5em;
  border-radius: 50%;
  animation: buttonSpinner 1.8s infinite ease-in-out;
  animation-fill-mode: both;
}
.loader {
  position: relative;
  top: -1.6em;
  margin: 0 auto;
  font-size: 8px;
  color: inherit;
  text-indent: -9999em;
  transform: translateZ(0);
  animation-delay: -.16s;
}
.loader::before,
.loader::after {
  position: absolute;
  top: 0;
  content: "";
}
.loader::before {
  left: -2.5em;
  animation-delay: -.32s;
}
.loader::after {
  left: 2.5em;
}

@keyframes buttonSpinner {
  0%,
  80%,
  100% {
    box-shadow: 0 1.5em 0 -.8em;
  }
  40% {
    box-shadow: 0 1.5em 0 0;
  }
}

//Usage
<button class="btn btn-primary btn-lg btn-block"
                type="submit" [disabled]="frm.invalid">
            <iwdf-ui-button-spinner
            [value]="'Login'"
            [has]="hasSubmitted"></iwdf-ui-button-spinner>
</button>