so#3771866

components.my-textfield.js

import Ember from 'ember';

export default Ember.Component.extend({
  idToPass: Ember.computed('elementId', function() {
    return this.get('elementId') + '-input';
  })
});
 

components.my-textfield.my-input.js

import Ember from 'ember';

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

components.my-textfield.my-label.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: 'span',
  
  attributeBindings: ['for']
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{my-textfield}}
<br>
<br>

templates.components.my-textfield.hbs

  {{my-textfield/my-input id=idToPass}}
  {{my-textfield/my-label for=idToPass}}

templates.components.my-textfield.my-input.hbs

{{yield}}

templates.components.my-textfield.my-label.hbs

{{yield}}

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"
  }
}