[рони]

Aetae,
а так ?

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.js"></script>
<div class="result">
  <textarea id="textarea-1">123</textarea>
</div>
<script>
$('#textarea-1').on('input', function(){
    this.firstChild.data = this.value;
  })
</script>
<input type="button" value="~_^" onclick="alert($('.result').html());">