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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>
 
function promptPromise(message) {
  var dialog       = document.getElementById('dialog');
  var input        = dialog.querySelector('input');
  var okButton     = dialog.querySelector('button.ok');
​
  dialog.querySelector('.message').innerHTML = String(message);
  dialog.className = '';
​
  return new Promise(function(resolve, reject) {
    dialog.addEventListener('click', function handleButtonClicks(e) {
      if (e.target.tagName !== 'BUTTON') { return; }
      dialog.removeEventListener('click', handleButtonClicks);
      dialog.className = 'hidden';
      if (e.target === okButton) {
        resolve(input.value);
      } else {
        reject(new Error('User cancelled'));
      }
    });
  });
}
​
document.addEventListener('DOMContentLoaded', function() {
  var button = document.getElementById('action');
  var output = document.getElementById('prompt');
  button.addEventListener('click', function() {
    promptPromise('What is your name?').then(function(name) {
      output.innerHTML = '' + name;
    })
    .catch(function() {
      output.innerHTML = '¯\\_(ツ)_/¯';
    });
  });
});
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