/*
* 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
*/

(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(); }, 200);
      })
      .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 + this.textarea.css("font-size").substring(0,this.textarea.css("font-size").length - 2) * 2;
        if (this.textarea.outerHeight() != target_height)
            this.textarea.height(target_height + 'px');
        this.clone.attr('value', this.textarea.attr('value')).height(0);
    };

})(jQuery);