mrbubbles-computed-on-hash

application.controller.js

import Ember from 'ember';

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

application.template.hbs

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

my-component.component.js

import Ember from 'ember';
var computed = Ember.computed;

export default Ember.Component.extend({
  isSaving: false,
  meter: Ember.Object.extend({
    nickname: '',
    location: '',
    latitude: '',
    longitude: '',
  }).create(),
  isPrimaryButtonDisabled: computed('meter.{nickname,location,latitude,longitude}', function() {
    console.log('a');
    var meter = this.get('meter');
    var nicknameEmpty = meter.get('nickname').length === 0;
    var locationEmpty = meter.get('location').length === 0;
    var latitudeEmpty = meter.get('latitude').length === 0;
    var longitudeEmpty = meter.get('longitude').length === 0;
    if (nicknameEmpty || locationEmpty || latitudeEmpty || longitudeEmpty) {
      return 'disabled';
    }
    return null;
  }),
  actions: {
    saveMeter() {
      console.log("saving the meter", this.get('meter'));
      this.attrs.saveMeter(this.get('meter'));
    },
  },
});

my-component.template.hbs

<h1>My Component</h1>
<table>
	<tr>
    <td>meter.nickname</td>
    <td>{{input value=meter.nickname}}</td>
  </tr>
	<tr>
    <td>meter.location</td>
    <td>{{input value=meter.location}}</td>
  </tr>
	<tr>
    <td>meter.latitude</td>
    <td>{{input value=meter.latitude}}</td>
  </tr>
	<tr>
    <td>meter.longitude</td>
    <td>{{input value=meter.longitude}}</td>
  </tr>
  
  <button {{action 'saveMeter'}} type='button' disabled={{isPrimaryButtonDisabled}}>
  	Primary Button
  </button>
</table>

twiddle.json

{
  "version": "0.4.14",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}