Simple jquery script enabling flexible textarea height

jquery.flexHeight.js

(function ($) {
	/* Simple jquery script enabling flexible textarea height. This seems to actually work and doens't require anything more than... this */
	$.fn.flexHeight = function () {
		var $obj = $(this);
		if (!$obj.length) {
			return;
		}
		if ($obj.attr('flexHeightInitialized')) {
			$obj.trigger('propertychange');
			return;
		}
		$obj.attr('flexHeightInitialized', true);
		$(window).resize(function () {
			$obj.trigger('propertychange');
		});
		setHeight($obj);
		$obj.on('input propertychange keyup change', function () {
			var $obj = $(this);
			setHeight($obj);
		});
	};
	var setHeight = function ($obj) {
		$obj.each(function (index) {
			var $i = $(this);
			$i.css('height', 0);
			var height = $i[0].scrollHeight;
			height += parseInt($i.css('border-bottom-width').replace('px', ''));
			height += parseInt($i.css('border-top-width').replace('px', ''));
			$i.css('height', height);
		});
	};
}(jQuery));