MediaWiki:Common.js

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/* <pre> */
/* Any JavaScript here will be loaded for all users on every page load. */

function UpdateTableHeaders() {
   $("div.divTableWithFloatingHeader").each(function() {
       offset = $(this).offset();
       scrollTop = $(window).scrollTop();
       if ((scrollTop > offset.top) && (scrollTop < offset.top + $(this).height())) {
           $(".tableFloatingHeader", this).css("visibility", "visible");
           $(".tableFloatingHeader", this).css("top", Math.min(scrollTop - offset.top, $(this).height() - $(".tableFloatingHeader", this).height()) + "px");
       }
       else {
           $(".tableFloatingHeader", this).css("visibility", "hidden");
           $(".tableFloatingHeader", this).css("top", "0px");
       }
   })
}

$(document).ready(function() {
   $("table.tableWithFloatingHeader").each(function() {
       $(this).wrap("<div class="divTableWithFloatingHeader" style="position:relative"></div>");
       $("tr:first", this).before($("tr:first", this).clone());
       clonedHeaderRow = $("tr:first", this)
       clonedHeaderRow.addClass("tableFloatingHeader");
       clonedHeaderRow.css("position", "absolute");
       clonedHeaderRow.css("top", "0px");
       clonedHeaderRow.css("left", "0px");
       clonedHeaderRow.css("visibility", "hidden");
   });
   UpdateTableHeaders();
   $(window).scroll(UpdateTableHeaders);
});