emberjs_autoresize_textarea.js

import Ember from 'ember';

export default Ember.Component.extend({
  didInsertElement() {
    this._super(...arguments);
    if (this.attrs.isAutoresize) {
      this.resize();
    }
  },

  resize: function() {
    if (this.attrs.isAutoresize) {
      const $el = this.$();
      $el.css('height', '1');
      $el.css('height', $el[0].scrollHeight);
    }
  }.on('input')
});