<!DOCTYPE html> <html> <head> <title>autoresizing textarea</title> <style type="text/css"> textarea { border: 0 none white; overflow: hidden; padding: 0; outline: none; background-color: #FFFFFF; resize: none; } </style> <script type="text/javascript"> var observe; if (window.attachEvent) { observe = function (element, event, handler) { element.attachEvent('on'+event, handler); }; } else { observe = function (element, event, handler) { element.addEventListener(event, handler, false); }; } function init () { var text = document.getElementById('text'); function resize () { text.style.height = 'auto'; text.style.height = text.scrollHeight+'px'; } /* 0-timeout to get the already changed text */ function delayedResize () { window.setTimeout(resize, 0); } observe(text, 'change', resize); observe(text, 'cut', delayedResize); observe(text, 'paste', delayedResize); observe(text, 'drop', delayedResize); observe(text, 'keydown', delayedResize); text.focus(); text.select(); resize(); } </script> </head> <body onload="init();"> <textarea cols="40" rows="1" style="height:25px;" id="text"></textarea> </body> </html>