demo.html

<!doctype html>

<meta charset="utf-8" />

<title>autoResize demo</title>

<style>
	body {
		width: 700px;
		font-family: sans-serif;
	}
	h1 {
		margin: 0;
		padding: 10px 0 20px;
	}
	textarea, input {
		font-family: inherit;
		font-size: 1em;
	}
	textarea { display: block; width: 200px; }
</style>

<h1>Textarea</h1>

<textarea id="edit1"></textarea>

<h1>Textarea with width &amp; height</h1>

<textarea id="edit2"></textarea>

<h1>Input</h1>

<input />


<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script>
<script src="jquery.autoresize.js"></script>
<script>
	$('textarea#edit1').autoResize({minHeight:100});
	$('textarea#edit2').autoResize({minHeight:100, minWidth:200, maxWidth:400, extraSpace:0, animate: false});
	$('input').autoResize({minWidth:300});
</script>