en_btr_frontend/app/components/verse.js

import Component from '@glimmer/component';
import { action } from '@ember/object';
import { inject as service } from '@ember/service';

export default class VerseComponent extends Component {
  @service('nav-state') navState;


  @action
  selectVerse() {
    this.args.verseSelected(this.args.book, this.args.chapter, this.args.verse);
    this.navState.setVerse(this.args.verse);
  }

  get
  selected() {
    if(this.navState.isCurrentVerse(this.args.verse)) {
      return "selected";
    } else {
      return "";
    }
  }
}