examples/to-from-auto.html

<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
  <title>tram.js example</title>
  <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
  <link rel="stylesheet" href="../support/styles/example.css">
  <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
  <script>window.jQuery || document.write('<script src="../node_modules/jquery/dist/jquery.min.js"><\/script>')</script>
  <script src="../dist/tram.js"></script>
  <style type="text/css">
    .test1 { overflow: hidden; width: 200px; }
    .stuff { padding: 30px 20px; }
  </style>
</head>
<body>

  <p>
    Transition pixels -> 'auto'.
  </p>

  <div class="test test1">
    <div class="stuff">stuff n things</div>
  </div>

  <script>

    var test = $('.test1');
    test.height(0);

    tram(test)
      .add('height 500ms ease')
      .start({ height: 'auto' })
      .then(function () {
        this.set({ height: 'auto' });
      });

  </script>

  <p>
    Transition 'auto' -> pixels.
  </p>

  <div class="test test2"></div>

  <script>

    var test2 = $('.test2');
    test2.width('auto');

    tram(test2)
      .add('width 1s ease')
      .start({ width: 0 });

  </script>

</body>
</html>