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how to get selected text inside a textarea element by javascript?

I'm not familiar with such attributes,

can someone provide a simple demo?

I need it to be done without any libraries.

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<script type="text/javascript">

        function ShowSelectionInsideTextarea()
{
 var textComponent = document.getElementById('mytextarea');

  var selectedText;
  // IE version
  if (document.selection != undefined)
  {
    textComponent.focus();
    var sel = document.selection.createRange();
    selectedText = sel.text;
  }
  // Mozilla version
  else if (textComponent.selectionStart != undefined)
  {
    var startPos = textComponent.selectionStart;
    var endPos = textComponent.selectionEnd;
    selectedText = textComponent.value.substring(startPos, endPos)
  }
    alert("You selected: " + selectedText);

}
</script>

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