modal octane

controllers.application\.js

import Controller from '@ember/controller';
import { action } from '@ember/object';
import { tracked } from '@glimmer/tracking';

export default class ApplicationController extends Controller {
  appName = 'Ember Twiddle';
	
	@tracked
	canShowModal = true;

  @action
  toggle() {
    this.canShowModal = !this.canShowModal
  }
}

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<button {{on "click" this.toggle}}>Show Modal</button>
<br>
{{#if canShowModal}}
	<div class="bck">	</div>
	<div class="body">
    <h1>
      Hello
    </h1>
    <button {{on "click" this.toggle}}>Close</button>
  </div>
{{/if}}
<br>
{{outlet}}
<br>
<br>

<style>
.bck {
	position: fixed;
  top: 0;
  right: 0;
  height: 100%;
  width: 100%;
  background: #eee;
  opacity: 0.8;
}
.body {
	z-index: 2;
  position: relative;
}
</style>

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",
    "@ember/render-modifiers": "1.0.2"
  }
}