Textarea Scroll

components.test-textarea.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions: {
    scroll: function(e) {
      this.set('text', this.get('text') + ' scroll!');
    },
    scroll: function(e) {
      this.set('text2', this.get('text2') + ' scroll!');
    },
  },
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

{{test-textarea}}

templates.components.test-textarea.hbs

{{textarea onscroll=(action 'scroll')}}
<p>Scroll?: {{text}}</p>

<br><br>

<textarea onscroll={{action 'scroll'}}></textarea>
<p>Scroll?: {{text2}}</p>

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"
  }
}