jquery.typeProgress

[1] Include plugin files:

<link rel="stylesheet" href="jquery.typeProgress.min.css">
<script src="jquery.typeProgress.min.js"></script>

[2] Your input must contains "maxlength" attribute:

<div class="form-group">
  <input type="text" maxlength="100" class="form-control type-progress-example">
</div>

[3] Initialize plugin like this example:

$('.type-progress-example').each(function() {
  $(this).typeProgress();
});

[4] Enjoy.