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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Async Dislogs Example</title>
  <script src="//cdn.jsdelivr.net/bluebird/3.0.5/bluebird.js"></script>
  <script type="text/javascript">
    document.addEventListener('DOMContentLoaded', function() {
      var time = document.getElementById('time-stamp');
      clockTick();
      setInterval(clockTick, 1000);
      function clockTick() {
        time.innerHTML = '' + new Date();
      }
    });
  </script>
  <style type="text/css">
    #dialog {
      width: 200px;
      margin: auto;
      border: thin solid black;
      padding: 10px;
      background: lightgreen;
    }
    .hidden {
      display: none;
    }
  </style>
</head>
<body>
  <p>The current time is <span id="time-stamp"></span>.</p>
  <p>Your name is <span id="prompt"></span>.</p>
  <button id="action">Set Name</button>
  <div id="dialog" class="hidden">
    <div class="message">foobar</div>
    <input type="text">
    <div>
      <button class="ok">Ok</button>
      <button class="cancel">Cancel</button>
    </div>
  </div>
</body>
</html>
 
var noop = function() {
  return this;
};
​
function Dialog() {
  this.setCallbacks(noop, noop);
}
Dialog.prototype.setCallbacks = function(okCallback, cancelCallback) {
  this._okCallback     = okCallback;
  this._cancelCallback = cancelCallback;
  return this;
};
Dialog.prototype.waitForUser = function() {
  var _this = this;
  return new Promise(function(resolve, reject) {
    _this.setCallbacks(resolve, reject);
  });
};
Dialog.prototype.show = noop;
Dialog.prototype.hide = noop;
​
function PromptDialog() {
  Dialog.call(this);
  this.el           = document.getElementById('dialog');
  this.inputEl      = this.el.querySelector('input');
  this.messageEl    = this.el.querySelector('.message');
  this.okButton     = this.el.querySelector('button.ok');
  this.cancelButton = this.el.querySelector('button.cancel');
  this.attachDomEvents();
}
PromptDialog.prototype = Object.create(Dialog.prototype);
PromptDialog.prototype.attachDomEvents = function() {
  var _this = this;
  this.okButton.addEventListener('click', function() {
    _this._okCallback(_this.inputEl.value);
  });
  this.cancelButton.addEventListener('click', function() {
    _this._cancelCallback();
  });
  
};
PromptDialog.prototype.show = function(message) {
  this.messageEl.innerHTML = '' + message;
  this.el.className = '';
  return this;
};
PromptDialog.prototype.hide = function() {
  this.el.className = 'hidden';
  return this;
};
​
document.addEventListener('DOMContentLoaded', function() {
  var button = document.getElementById('action');
  var output = document.getElementById('prompt');
  var prompt = new PromptDialog();
  button.addEventListener('click', function() {
    prompt.show('What is your name?')
      .waitForUser()
      .then(function(name) {
        output.innerHTML = '' + name;
      })
      .catch(function() {
        output.innerHTML = '¯\\_(ツ)_/¯';
      })
      .finally(function() {
        prompt.hide();
      });
  });
});
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