Instructions

A good set of instructions on how to do sortable tables in Plone is available here:

http://plone.org/documentation/tutorial/making-tables-sortable

Fixing up Plone 2.1

Here is a sortable table in Plone.  Click on the headings:

Numbers	Text	Values
One	This is	123
Two	a	7.86
Three	test of the	4.56
Four	sorting of	999
Five	tables in Javascript	.0001

To get this to work, you need to fix up a misconfiguration in Plone's "Safe HTML" transformation.  It kills <thead> entries in <table>, which are required for the sorting Javascript to work.

Go to your Zope Management console for your Plone instance, and go to portal_transforms->safe_html->valid_tags.  In there, add 'thead' and '1' to the table of valid HTML.  After you save it, restart your zope.  You should have sortable tables!

Non-Plone implement

To do this outside of plone, you'll have to load your own javascript:

http://kryogenix.org/code/browser/sorttable/