jQuery plugin for word / character counting

charCount.js

/*
 * Character Count Plugin - jQuery plugin
 * Dynamic character count for text areas and input fields
 * written by Alen Grakalic
 * http://cssglobe.com/post/7161/jquery-plugin-simplest-twitterlike-dynamic-character-count-for-textareas
 * and Richard Howard, Roubini Global Economics
 * http://www.roubini.com
 *
 * Copyright (c) 2009 Alen Grakalic (http://cssglobe.com)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 * Built for jQuery library
 * http://jquery.com
 *
 */

(function($)
{
	$.fn.charCount = function (userOptions)
	{
		var defaults = {
				type: 'char', // or 'word'
				allowed: 140,
				warning: 25,
				css: 'counter',
				counterElement: 'span',
				cssWarning: 'warning',
				cssExceeded: 'exceeded',
				counterText: '',
				contentCall: function (content) { return content; }
			},
			options = $.extend(defaults, userOptions)
		;

		function makeCalc(self, counter)
		{
			return function calculate() {
				var v = options.contentCall(self.val()),
					count = (options.type === 'word' && v.length > 0)
						? v.replace(/^\s+|\s+$/g).split(/\s+/).length
						: v.length,
					available = options.allowed - count;

				if (available <= options.warning && available >= 0){
					counter.addClass(options.cssWarning);
				} else {
					counter.removeClass(options.cssWarning);
				}
				if (available < 0){
					counter.addClass(options.cssExceeded);
				} else {
					counter.removeClass(options.cssExceeded);
				}
				counter.html(options.counterText + available);
			};
		}

		this.each(function () {
			var self = $(this),
				counter = $(
						'<'+ options.counterElement +' class="' + options.css + '">'
						+ options.counterText +'</'+ options.counterElement +'>'
					).insertAfter(self),

				calc = makeCalc(self, counter)
			;

			calc();
			self.bind('keyup change', calc);
		});

	};

}(jQuery));

A sample contentCall function is provided at https://gist.github.com/1478461