Window Events Component Example

components.window-events.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: '',
	resizeCount: 0,
  didInsertElement() {
    window.addEventListener('resize', () => { 
      this.set('resizeCount', this.resizeCount + 1);
      console.log('resizing'); 
    });
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>

{{#window-events as |resizeCount|}}
  Resized {{resizeCount}} times
{{/window-events}}

templates.components.window-events.hbs

{{yield resizeCount}}

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"
  }
}