New Twiddle

application.controller.js

import Ember from 'ember';

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

application.template.hbs

<h1>Welcome to {{appName}}</h1>
Page 1 renders `my-component` which attaches `on-click` handlers to window.document. It appends .bind(this) to the callback function for getting component context in callback. But binding(this) creates a new instance of the function and it will not be the same while removing.
Hence the event handlers will not be removed on `willDestroy`.
<br >
<br >
So Everytime switching between page1 and page2, new event handlers will be registered (and will not be closed) and might lead to performance issues. Check Console.
<br >
<br >
{{#link-to "page1"}}Page1{{/link-to}}
{{#link-to "page2"}}Page2{{/link-to}}
<br>
<br>
{{outlet}}
<br>
<br>

my-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  callback() {
    console.log(`document clicked and handler registered by ${this.elementId}`);
  },
  init() {
    this._super(...arguments);
    $(window.document).on('click', this.callback.bind(this));
  },
  
  willDestroy() {
  
    this._super(...arguments);  	         $(window.document).off('click',this.callback.bind(this)); 
  }
});

my-component.template.hbs

{{yield}}

page1.route.js

import Ember from 'ember';

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

page1.template.hbs

{{#my-component}}
Component Rendered and click event registered to document
{{/my-component}}


<br>
<br>
{{#link-to "application"}}
	Back to Home
{{/link-to}}

page2.route.js

import Ember from 'ember';

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

page2.template.hbs

{{#link-to "application"}}
Back to Home
{{/link-to}}

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: 'none'
});

Router.map(function() {
  this.route('page1');
  this.route('page2');
});

export default Router;

twiddle.json

{
  "version": "0.6.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "beta",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.3.3/ember-data.js",
    "ember-template-compiler": "beta"
  }
}