Assigns auto height fitting for any <textarea/> on page

textarea_auto_resize.js

//requires _.throttle and jquery, but dependency could be removed
(function() {
    var AutoGrowTextArea;
    AutoGrowTextArea = function(e) {
      var textField;
      textField = e.target;
      if (textField.clientHeight < textField.scrollHeight) {
        textField.style.height = textField.scrollHeight + 'px';
        if (textField.clientHeight < textField.scrollHeight) {
          textField.style.height = textField.scrollHeight * 2 - textField.clientHeight + 'px';
        }
      }
    };
    return $('textarea').keyup(_.throttle(AutoGrowTextArea, 900));
})();