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textareaObject.disabled=true|false

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<html>
<head>
<script type="text/javascript">
function disable()
  {
  document.getElementById('txt1').disabled=true;
  }
function enable()
  {
  document.getElementById('txt1').disabled=false;
  }
</script>
</head>
<body>

<textarea id="txt1">
Hello world....This is a text area
</textarea>
<br />
<input type="button" onclick="disable()" value="Disable" />
<input type="button" onclick="enable()" value="Enable" />

</body>
</html>
VUE