New Twiddle

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  
  actions: {
    changeName(newName) {
      this.set('appName', newName);
    }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{appName}}
{{#modal-view model=(readonly appName) submit=(action 'changeName') as |model|}}
  {{input value=model}}
{{/modal-view}}
<br>
<br>

modal-view.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions: {
    submit() {
      const submit = this.getAttr('submit');
    
      submit(this.get('model'));
    }

  }
});

modal-view.template.hbs

{{yield model}}
<button {{action (action 'submit')}}>Submit</button>

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}