Fun with DDAU

components.my-child.js

import Ember from 'ember';

export default Ember.Component.extend({
  init() {
    this._super(...arguments);
    
  }
});

components.my-parent.js

import Ember from 'ember';

export default Ember.Component.extend({
  parentText: "hello",
  actions: {
    updateText(text) {
      this.set("parentText", text);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  parentText: "hello"
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

.value {
  color: #6ac1b9;
  font-size: 1.2em;
}

textarea {
  resize: none;
  background-color: #fafafa;
  border: solid 1px rgba(106, 193, 185, 0.67);
  color: #6ac1b9;
}

.text-with-label {
  margin-top: 20px;
  display: inline-block;
  position: relative;
}

.text-with-label textarea {
  border: solid 1px rgba(106, 193, 185, 0.67);
  border-radius: 3px;
  display: inline-block;
  font-weight: 500;
  font-size: 1.2em;
  outline: 0;
  padding: 20px;
  width: 300px;
}

.text-with-label textarea + label {
    background-color: #f8f8f8;
    border-radius: 3px;
    box-shadow: -1px 1px 0 0 rgba(0, 0, 0, 0.08);
    color: #6ac1b9;
    display: inline-block;
    font-family: "Whitney-Pro", sans-serif;
    font-weight: 400;
    font-size: 13px;
    position: absolute;
    top: -15px;
    left: 10px;
    padding: 5px 8px;
  }

templates.application.hbs

<h1>Fun with DDAU</h1>

{{outlet}}

{{my-parent}}
<br>
<br>

templates.components.my-child.hbs

{{yield}}

<p>
  <div class="text-with-label">
    {{textarea id="one" rows="3" value=text}}
    <label for="one">Mutable two-way binding</label>
    </div>
</p>

<p>
  <div class="text-with-label">
    <textarea id="two" rows="3" value={{text}} oninput={{action updateText value="target.value"}}></textarea>
    <label for="two">Non-mutable with explicit action</label>
  </div>
</p>

<p>
  <div class="text-with-label">
    <textarea id="three" rows="3" value={{text}} oninput={{action (mut text) value="target.value"}}></textarea>
    <label for="three">Non-mutable with mut helper</label>
  </div>
</p>

<p>
  Value:
  <span class="value">{{text}}</span>
</p>

templates.components.my-parent.hbs

{{yield}}

{{my-child text=(mut parentText) updateText=(action "updateText")}}

twiddle.json

{
  "version": "0.10.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.6.0",
    "ember-data": "2.6.1",
    "ember-template-compiler": "2.6.0"
  },
  "addons": {}
}