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<!DOCTYPE html>
<html>
<head>
<script src="https://code.jquery.com/jquery-2.1.1.min.js"></script>
  <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" type="text/css" />
  <meta charset="utf-8">
  <title>JS Bin</title>
</head>
<body>
<div class="well clearfix">
    <textarea class="form-control"></textarea><br>
    <span>140</span>
    <button class="js-tweet-button btn btn-primary pull-right" disabled>Tweet</button>
    <button class="js-add-photo-button btn btn-default pull-right">Add Photo</button>
  </div>
</body>
</html>
 
$("textarea").on("input", function() {
  if ($(".js-add-photo-button").hasClass("is-on")) {
    $("span").text(140 - 23 - $(this).val().length);
  } else {
    $("span").text(140 - $(this).val().length);
  }
​
  if ($(this).val().length > 0 || $(".js-add-photo-button").hasClass("is-on")) {
    $(".js-tweet-button").prop("disabled", false);
  } else {
    $(".js-tweet-button").prop("disabled", true);
  }
});
​
$(".js-add-photo-button").on("click", function() {
  if ($(this).hasClass("is-on")) {
    $(this)
      .removeClass("is-on")
      .text("Add Photo");
    $("span").text(140 - $("textarea").val().length);
    if ($("textarea").val().length === 0) {
      $(".js-tweet-button").prop("disabled", true);
    }
  } else {
    $(this)
      .addClass("is-on")
      .text("✓ Photo Added");
    $("span").text(140 - 23 - $("textarea").val().length);
    $(".js-tweet-button").prop("disabled", false);
  }
});
​
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