so-47685141

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  actions: {
    insertEntry(index) {
      this.get('model.entries').addObject({text: `Example${index+1}`});
      
      Ember.run.scheduleOnce('afterRender', this, function () {
        Ember.$(`.field--entry:eq(${index+1})`).focus();
      });
    }
  }
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return {entries: [{text: 'john doe'}]};
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{#each model.entries as |entry index|}}
  {{input value=entry.text class='field--entry' data-index=index insert-newline=(action 'insertEntry' index)}}
{{/each}}
<br>
<br>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}