How do you trigger an animation?

Angular provides a trigger() function for animation in order to collect the states and transitions with a specific animation name, so that you can attach it to the triggering element in the HTML template. This function watch for changes and trigger initiates the actions when a change occurs. For example, let's create trigger named upDown, and attach it to the button element.

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@Component({
  selector: 'app-up-down',
  animations: [
    trigger('upDown', [
      state('up', style({
        height: '200px',
        opacity: 1,
        backgroundColor: 'yellow'
      })),
      state('down', style({
        height: '100px',
        opacity: 0.5,
        backgroundColor: 'green'
      })),
      transition('up => down', [
        animate('1s')
      ]),
      transition('down => up', [
        animate('0.5s')
      ]),
    ]),
  ],
  templateUrl: 'up-down.component.html',
  styleUrls: ['up-down.component.css']
})
export class UpDownComponent {
  isUp = true;

  toggle() {
    this.isUp = !this.isUp;
  }

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