MediaWiki:Gadget-stickyHeader.js

/*
 * 
 * @see Based on https://minecraft.wiki/w/MediaWiki:Gadget-stickyHeader.js
 */
$(function() {
    $('#left-navigation, #right-navigation').wrapAll('<div id="stickyTop"></div>').wrapAll('<div id="stickyTopFlex"></div>');
    $('<div id="stickyTopBack"></div>').appendTo('#stickyTop');
    var stickyTop = $('#stickyTop');
    var nsTop = $('#p-namespaces').offset().top;

    function sticky() {
	    var scrollTop = $(window).scrollTop();
	
	    if (scrollTop > nsTop) { 
	        stickyTop.addClass('stick');
	    } else {
	        stickyTop.removeClass('stick'); 
	    }
    };

    sticky();

    $(window).scroll(sticky);
});