Auto Resize Textarea jQuery plugin

Auto Resize Textarea jQuery plugin

/**
 * Auto Resize Textarea jQuery plugin 
 *
 * Created by putra.surya.h60@gmail.com | Twitter @PutraSoerya9
 *
 */

(function($){

	var AutoResize = function () {
		var o, el,
			_ = this;

		_.init = function (elm, opt) {
			o = opt;
			el = elm;
			el.ready(_.autoresize({}));
			el.bind('keyup.AutoResize', _.autoresize);
		}

		_.autoresize = function (e) {
			var content = el.val(),
				splitRes = content.split("\n");

			if (splitRes.length > o.line-1) {
				el.css('height', o.line_height*splitRes.length);
			}
		};
	};

	$.fn.AutoResizeTextarea = function(opt) {
		var o = $.extend({
			line: 3,
			line_height: 21 /* line height css style of this textarea */
		}, opt);

		return $(this).each(function(){
			var elm = $(this);

			if (!elm.is("textarea")) return;

			var autoResize = (new AutoResize).init(elm, o);

			$(this).data('AutoResizeTextarea', autoResize);
		});
	};

})(jQuery);