jquery.fixedtableheader.1.0.3.js

/* Copyright (c) 2009 Mustafa OZCAN (http://www.mustafaozcan.net)
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 * Version: 1.0.2
 * Requires: jquery.1.3+
 */
jQuery.fn.fixedtableheader = function (options) {
   var settings = jQuery.extend({
      headerrowsize: 1,
      highlightrow: false,
      highlightclass: "highlight"
   }, options);
   this.each(function (i) {
      var $tbl = $(this);
      var $tblhfixed = $tbl.find("tr:lt(" + settings.headerrowsize + ")");
      var headerelement = "th";
      if ($tblhfixed.find(headerelement).length == 0) headerelement = "td";
      if ($tblhfixed.find(headerelement).length > 0) {
         $tblhfixed.find(headerelement).each(function () {
            $(this).css("width", $(this).width());
         });
         var $clonedTable = $tbl.clone().empty();
         var tblwidth = GetTblWidth($tbl);
         $clonedTable.attr("id", "fixedtableheader" + i).css({
            "position": "fixed",
            "top": "0",
            "left": $tbl.offset().left
         }).append($tblhfixed.clone()).width(tblwidth).hide().appendTo($("body"));
         if (settings.highlightrow) $("tr:gt(" + (settings.headerrowsize - 1) + ")", $tbl).hover(function () {
            $(this).addClass(settings.highlightclass);
         }, function () {
            $(this).removeClass(settings.highlightclass);
         });
         $(window).scroll(function () {
            if (jQuery.browser.msie && jQuery.browser.version == "6.0") $clonedTable.css({
               "position": "absolute",
               "top": $(window).scrollTop(),
               "left": $tbl.offset().left
            });
            else $clonedTable.css({
               "position": "fixed",
               "top": "0",
               "left": $tbl.offset().left - $(window).scrollLeft()
            });
            var sctop = $(window).scrollTop();
            var elmtop = $tblhfixed.offset().top;
            if (sctop > elmtop && sctop <= (elmtop + $tbl.height() - $tblhfixed.height())) $clonedTable.show();
            else $clonedTable.hide();
         });
         $(window).resize(function () {
            if ($clonedTable.outerWidth() != $tbl.outerWidth()) {
               $tblhfixed.find(headerelement).each(function (index) {
                  var w = $(this).width();
                  $(this).css("width", w);
                  $clonedTable.find(headerelement).eq(index).css("width", w);
               });
               $clonedTable.width($tbl.outerWidth());
            }
            $clonedTable.css("left", $tbl.offset().left);
         });
      }
   });

   function GetTblWidth($tbl) {
      var tblwidth = $tbl.outerWidth();
      return tblwidth;
   }
};