// Auto Expanding Text Area (1.2.2)
// http://www.aclevercookie.com/demos/autogrow_textarea.html
(function (jQuery) {
  var self = null;
  jQuery.fn.autogrow = function (o) {
    return this.each(function () {
      new jQuery.autogrow(this, o);
    });
  };

  jQuery.autogrow = function (e, o) {
    this.options = o || {};
    this.dummy = null;
    this.interval = null;
    this.line_height = this.options.lineHeight || parseInt(jQuery(e).css('line-height'));
    this.min_height = this.options.minHeight || parseInt(jQuery(e).css('min-height'));
    this.max_height = this.options.maxHeight || parseInt(jQuery(e).css('max-height'));;
    this.textarea = jQuery(e);
    if (this.line_height == NaN) this.line_height = 0; // Only one textarea activated at a time, the one being used
    this.init();
  };

  jQuery.autogrow.fn = jQuery.autogrow.prototype = {
    autogrow: '1.2.2'
  };
  jQuery.autogrow.fn.extend = jQuery.autogrow.extend = jQuery.extend;
  jQuery.autogrow.fn.extend({
    init: function () {
      var self = this;
      this.textarea.css({
        overflow: 'hidden',
        display: 'block'
      });
      this.textarea.bind('focus', function () {
        self.startExpand()
      }).bind('blur', function () {
        self.stopExpand()
      });
      this.checkExpand();
    },
    startExpand: function () {
      var self = this;
      this.interval = window.setInterval(function () {
        self.checkExpand()
      },
      400);
    },
    stopExpand: function () {
      clearInterval(this.interval);
    },
    checkExpand: function () {
      if (this.dummy == null) {
        this.dummy = jQuery('<div></div>');
        this.dummy.css({
//          'font-size': this.textarea.css('font-size'),
//          'font-family': this.textarea.css('font-family'),
//          'width': this.textarea.css('width'),
//          'padding': this.textarea.css('padding'),
//          'line-height': this.line_height + 'px',
          'overflow-x': 'hidden',
          'position': 'absolute',
          'top': 0,
          'left': -9999
        }).appendTo('body');
      } // Strip HTML tags
      var html = this.textarea.val().replace(/(<|>)/g, ''); // IE is different, as per usual
      if ($.browser.msie) {
        html = html.replace(/\n/g, '<BR>new');
      } else {
        html = html.replace(/\n/g, '<br>new');
      }
      if (this.dummy.html() != html) {
        this.dummy.html(html);
        if (this.max_height > 0 && (this.dummy.height() + this.line_height > this.max_height)) {
          this.textarea.css('overflow-y', 'auto');
        } else {
          this.textarea.css('overflow-y', 'hidden');
          if (this.textarea.height() < this.dummy.height() + this.line_height || (this.dummy.height() < this.textarea.height())) {
            this.textarea.animate({
              height: (this.dummy.height() + this.line_height) + 'px'
            },
            100);
          }
        }
      }
    }
  });
})(jQuery);