I am one of many happy users of the jQuery Validation plugin by Jörn Zaefferer, but I had some trouble with the Google Toolbar's auto-fill feature. When enabled, it adds a tooltip to text input fields it didn't auto-fill that says:
Your Google Toolbar can fill this in for you. Select AutoFill
One of the ways to tell the validation plugin which error message to show is by... setting the '
title' attribute, so when the Toolbar is installed all the error messages are "Your Google Toolbar can...."
So now there's a trac ticket including a patch with a new '
ignoreTitle' option that fixes this (if you don't use 'title' yourself).
[Edit: 26 October, 2008] Jörn has commited my patch, you can get the latest jQuery Validate plugin with Subversion:
svn co http://jqueryjs.googlecode.com/svn/trunk/plugins/validate
[Edit: 3 November, 2008] Only 'jquery.validate.js' contains the patch in svn - the minified and packed versions don't. Use the YUI Compressor or the CompressorRater to minify them yourself. Thanks to Ilan Berkner for catching this.
[Edit:21 November, 2008] Here's a direct link to the file
[Edit:8 December, 2008] Version 1.5 of the Validation plugin now contains this patch.