Posted almost 7 years ago. Visible to the public.

Sticky table header with jQuery

When you want the table headers to always stay around (e.g. because that table is huuuge), use the code below.

Style

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table.fixed_table_header{ position: fixed; top: 0; width: auto; display: none; border: none; margin: 0; }

Javascript

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;(function($) { $.fn.fixHeader = function() { return this.each(function() { var $table = $(this), $t_fixed; function init() { $t_fixed = $table.clone(); $t_fixed.find('tbody').remove().end().addClass('fixed_table_header').insertBefore($table); resizeFixed(); } function resizeFixed() { $t_fixed.find("th").each(function(index) { $(this).css("min-width",$table.find("th").eq(index).width()+"px"); }); } function scrollFixed() { var offset = $(this).scrollTop(), tableOffsetTop = $table.offset().top, tableOffsetBottom = tableOffsetTop + $table.height() - $table.find("thead").height(); if(offset < tableOffsetTop || offset > tableOffsetBottom) $t_fixed.hide(); else if(offset >= tableOffsetTop && offset <= tableOffsetBottom && $t_fixed.is(":hidden")) $t_fixed.show(); // left-align $t_fixed with $table $t_fixed.css("left", $table.offset().left - $(this).scrollLeft()); } $(window).resize(resizeFixed); $(window).scroll(scrollFixed); init(); }); }; })(jQuery);

The init function clones the table, throws away the table body, hides the clone and inserts it before the actual table. Then it "manually" sets the width of the clone's elements to those of the actual table. Whenever the user scrolls, the clone is hidden or shown appropriately and scrolled horizontally.

This is an improvement of this codepen.

By refactoring problematic code and creating automated tests, makandra can vastly improve the maintainability of your Rails application.

Owner of this card:

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Dominik Schöler
Last edit:
almost 7 years ago
About this deck:
We are makandra and do test-driven, agile Ruby on Rails software development.
License for source code
Posted by Dominik Schöler to makandra dev
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