Loading State example

controllers.application\.js

import Controller from '@ember/controller';
import { observer } from '@ember/object';
import { inject as service } from '@ember/service';

function onRouteChange() {
      console.log('currentRoute', this.router.currentRoute?.name);
    	console.log('currentRouteName', this.router.currentRouteName);
    }

export default class ApplicationController extends Controller {
  @service router;
  
  appName = 'Ember Twiddle';

  constructor() {
    super(...arguments);
    this.get('router.currentRoute');
    this.get('router.currentRouteName');
    this.addObserver('router.currentRouteName', 'router.currentRoute', onRouteChange.bind(this));
  }
}

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('first-route', { path: '/first-route' });
  this.route('second-route', { path: '/second-route' });
});

export default Router;

routes.application\.js

import Route from '@ember/routing/route';

export default Route.extend({

});

routes.first-route\.js

import Route from '@ember/routing/route';
import { later } from '@ember/runloop';
import RSVP from 'rsvp';

export default Route.extend({
  model() {
    return new RSVP.Promise(resolve => {
      later(this, resolve, 3000);
    });
  }
});

routes.second-route\.js

import Route from '@ember/routing/route';
import { later } from '@ember/runloop';
import RSVP from 'rsvp';

export default Route.extend({
  model() {
    return new RSVP.Promise(resolve => {
      later(this, resolve, 3000);
    });
  }
});

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>
<br>
<br>
<LinkTo @route="first-route">First Route</LinkTo>
<br>
<LinkTo @route="second-route">Second Route</LinkTo>
<br>
<br>
currentRoute.name: {{this.router.currentRoute.name}}
<br>
currentRouteName: {{this.router.currentRouteName}}
<br>
<br>
{{outlet}}
<br>
<br>

templates.first-route-loading\.hbs

First route LOADING

templates.first-route\.hbs

First route

templates.second-route-loading\.hbs

Second route LOADING

templates.second-route\.hbs

Second route

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"
  }
}