/*
* Simple Auto Expanding Text Area (0.1.2-dev)
* by Antti Kaihola (antti.kaihola.fi)
* akaihol+jquery@ambitone.com
*
* Copyright (c) 2009 Antti Kaihola (antti.kaihola.fi)
* Licensed under the MIT and BSD licenses.
*
* NOTE: This script requires jQuery to work. Download jQuery at
* www.jquery.com
*/

// http://github.com/akaihola/jquery-simpleautogrow/tree/master/

(function(jQuery) {
	jQuery.fn.simpleautogrow = function() {
		return this.each(function() {
			new jQuery.simpleautogrow(this);
		});
	};
	jQuery.simpleautogrow = function (e) {
		var self = this;
		var $e = this.textarea = jQuery(e)
			.css({overflow: 'hidden', display: 'block'})
			.bind('focus', function() {
				this.timer = window.setInterval(function() { self.checkExpand(); }, 100);
			})
			.bind('blur', function() {
				clearInterval(this.timer);
			});
		this.border = $e.outerHeight() - $e.innerHeight();
		this.clone = $e.clone().css({
			position: 'absolute', visibility: 'hidden'
		}).attr('name', '');
		$e.height(e.scrollHeight + this.border).after(this.clone);
		this.checkExpand();
	};
	jQuery.simpleautogrow.prototype.checkExpand = function() {
		var target_height = this.clone[0].scrollHeight + this.border;
		if (this.textarea.outerHeight() != target_height) this.textarea.height(target_height + 'px');
		this.clone.attr('value', this.textarea.attr('value')).height(0);
	};
})(jQuery);