A lightweight (~800 bytes) jQuery version of the A List Apart - Expanding textarea concept for auto-height textareas, extended for additional browser compatibility, addressing a few browser bugs/issues. Tested and working fine in Safari Mac/iOS 5, Chrome, Firefox 3.6 , Opera, IE8 . (In IE7 the functionality is fine, but the textarea may not be pixel-perfect due to box-sizing browser limitations).

See the project page.

1. Add the base CSS rules from style.css to your stylesheet (and add visual styling for your purposes).
2. Include the JS files:
   • jQuery (v1.7 )
   • flexText plugin (jquery.flexText.min.js).
3. Inside a document ready function, call the flexText() method on textarea elements:

$(function () {
	$('textarea').flexText();
});

jQuery v1.7

Based on/extended from the concept by Neil Jenkins described in the A List Apart article, Expanding Text Areas Made Elegant