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<body>
<script type="text/javascript">$(function(){
$("textarea").live("keyup keydown",function(){var h=$(this);
h.height(h[0].scrollHeight);
});});
</script>
<textarea style="resize:none;width:760px;height:60px; overflow:hidden;" ></textarea>
</body>
When textarea get overflowed it get scrollbar and scrollheight which gets applied to its height but not working for decreasing textarea height as on decreasing its value length it doesnot get scrollbar
The minimum scrollHeight of a textarea is always going to be the height. To get an accurate scrollHeight, set the height to 1 first.
http://jsfiddle.net/aarongloege/t2vAr/