Dynamic components

components.inner-one.js

import Ember from 'ember';

export default Ember.Component.extend({
  input(event) {
    this.sendAction('select', Number(event.target.value));
  }
});

components.inner-two.js

import Ember from 'ember';

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

components.outer-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  currentComponent: 'inner-one',
  number: 0,
  
  actions: {
    select(num) {
      this.set('number', num);
    }
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

{{outer-component}}

templates.components.inner-one.hbs

Inner One <input type="text" />

templates.components.inner-two.hbs

Inner Two

templates.components.outer-component.hbs

Outer {{number}}

<div {{action (action (mut currentComponent) 'inner-two')}}>Next</div>

{{component currentComponent select=(action 'select')}}

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.7.0",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.7.0"
  },
  "addons": {}
}