init controller

controllers.a.js

import Ember from 'ember';

export default Ember.Controller.extend({
  applicationController: Ember.inject.controller('application'),
  thing: Ember.on('init', function() {
    $('input.a').prop('checked', true);
  })
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  message: 'hi',
  init: Ember.on('init', function() {
    const router = Ember.getOwner(this).lookup("router:main");
    const url = router.generate('a');
    this.set('urlForA', url);
    this.set('version', Ember.VERSION);
  }),
});

controllers.b.js

import Ember from 'ember';

export default Ember.Controller.extend({
  applicationController: Ember.inject.controller('application'),
  thing: Ember.on('init', function() {
    $('input.b').prop('checked', true);
  })
});

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('a');
  this.route('b');
  this.route('c');
});

export default Router;

templates.a.hbs

Hello I am A!

templates.application.hbs

<input type=checkbox class='a'>on init of A fired<br>
<input type=checkbox class='b'>on init of B fired<br>
Ember Version: {{version}}
<br>
{{#link-to 'c'}}link-to C{{/link-to}}
<br><br>
{{outlet}}

templates.b.hbs

Hello I am B!

templates.c.hbs

Hello I am C!

{{#link-to 'a'}}link-to A{{/link-to}}
{{#link-to 'b'}}link-to B{{/link-to}}

twiddle.json

{
  "version": "0.14.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "2.14.1",
    "ember-template-compiler": "2.14.1"
  },
  "addons": {}
}