Parent / Child routes

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

router.js

import EmberRouter from '@ember/routing/router';
import config from './config/environment';

const Router = EmberRouter.extend({
  location: 'none',
  rootURL: config.rootURL
});

Router.map(function() {
  this.route('parent-route', { path: '/' }, function() {
    this.route('child-route', { path: '/' });
  });
});

export default Router;

routes.parent-route.child-route.js

import Ember from 'ember';

export default Ember.Route.extend({
  
  actions: {
   	childAction() {
     	this.send('parentAction', 'Yo'); 
    }
  }
});

routes.parent-route.js

import Ember from 'ember';

export default Ember.Route.extend({
  setupController() {
    this._super(...arguments);
    this.set('controller.parentNameValue', 'None');
  },
  actions: {
    parentAction(value) {
      this.set('controller.parentNameValue', value); 
    }
  }
});

templates.application.hbs

<h1>Parent / Child route example</h1>
<br>
<br>
{{outlet}}
<br>
<br>

templates.parent-route.child-route.hbs

<div style="background-color: hsl(0,50%,80%); padding: 40px; margin: 20px; display: flex; flex-direction: column; align-items: center;">
  <h3> Child Route </h3>
  <button {{action 'childAction'}}>Send Child Action</button>
</div>

templates.parent-route.hbs

<div style="background-color: hsl(240,50%,80%); padding: 40px; display: flex; flex-direction: column; align-items: center;">
  <h3> Parent Route </h3>
  <span>Value from child: {{parentNameValue}}</span>
  {{outlet}}
</div>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}