Accordion

components.accordion\.js

import Component from '@glimmer/component';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';
import { guidFor } from '@ember/object/internals';

export default class Accordion extends Component {

  @tracked isActive = false
  accordionId = 'accordion-' + guidFor(this);

  @action
  toggleAccordion() {
    this.isActive = !this.isActive
  }

}

controllers.application\.js

import Controller from '@ember/controller';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
}

styles.app\.css

/* ==========================================================================
  auk-accordion
  ========================================================================== */

.auk-accordion__content {
  display: none;
  transition: max-height 0.3s cubic-bezier(0, 1.05, 0, 1), overflow 0s 0s;
}

.auk-accordion--is-active .auk-accordion__content {
  display: block;
}

templates.application\.hbs

{{yield}}

<Accordion @label="My Accordion Title">
  Content here...!
</Accordion>

templates.components.accordion\.hbs

<div class="auk-accordion {{if this.isActive "auk-accordion--is-active"}}">
    
    <button
      {{on "click" this.toggleAccordion}}
      aria-expanded={{if this.isActive "true" "false"}}
      aria-controls={{this.accordionId}}
    >
     {{@label}}
    </button>

    <div
      class="auk-accordion__content"
      id={{this.accordionId}}
      aria-hidden={{if this.isActive "false" "true"}}
    >
      {{yield}}
    </div>

</div>

twiddle\.json

{
  "version": "0.17.1",
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0"
  }
}