New Twiddle

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';

let pre = document.createElement('pre');
pre.id = 'log';
pre.innerHTML = 'LOG: Last Route Path'


document.body.appendChild(pre);

const Router = EmberRouter.extend({
  location: 'none',
  rootURL: config.rootURL,
  router: Ember.inject.service('router'),
  lastRoutePath: null,
  willTransition() {
    this._super(...arguments);
    this.set('lastRoutePath', this.get('router').currentRouteName)
  },
  didTransition() {
    this._super(...arguments);
    let pre = document.getElementById('log');
    console.log(this.lastRoutePath);
    pre.innerHTML = pre.innerHTML + '\n' + this.lastRoutePath;
  }
});

Router.map(function() {
  this.route('a');
  this.route('b');
});

export default Router;

routes.a.js

import Ember from 'ember';

export default Ember.Route.extend({
});

templates.a.hbs

A

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{#link-to 'a'}}A{{/link-to}}
{{#link-to 'b'}}B{{/link-to}}
<br>
<br>

templates.b.hbs

B

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"
  }
}