New Twiddle

components.event-blocker.js

import Ember from 'ember';

export default Ember.Component.extend({
  type: '',

  blockEvent(type, event) {
    event.preventDefault();
    event.preventDefault();
    alert(`Blocked your ${type} event: ${event.target.value}`);
  },
  
  didInsertElement() {
    this.type.split(',').forEach(type =>
      this.element.addEventListener(
        type,
        event => this.blockEvent(type, event),
        true
      )
    );
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<EventBlocker @type="input,change,keyup,keydown">
  {{input value=this.appName}}
</EventBlocker>
<br>
<br>

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"
  }
}