Distance Calculator

application.controller.js

import Ember from 'ember';

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

application.template.hbs

<h1>Distance Calculator</h1>
<br>
<br>
{{distance-calculator}}
<br>
<br>

distance-calculator.component.js

import Ember from 'ember';

const { computed } = Ember;

function round(value) {
  return Math.round(value * 100) / 100;
};

// 1.60934 kilometers per mile
// 0.621371 miles per kilometer
export default Ember.Component.extend({
  kilometers: 0,
  miles: 0,

  updateMiles(value) {
    this.set('miles', round(parseFloat(value) * 0.621371));
  },

  updateKilometers(value) {
    this.set('kilometers', round(parseFloat(value) * 1.60934));
  }
});

distance-calculator.template.hbs

{{input value=(readonly kilometers) key-up=(action updateMiles)}} Kilometers
<br>
{{input value=(readonly miles) key-up=(action updateKilometers)}} Miles
<br>
<br>
<b>Kilometers: </b>{{kilometers}}
<br>
<b>Miles: </b>{{miles}}

styles.app.css

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

input {
  text-align: right;
  width: 5em;
}

twiddle.json

{
  "version": "0.5.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.2.0",
    "ember-data": "2.2.0",
    "ember-template-compiler": "2.2.0"
  }
}