Modify selected text in a textarea

<!-- Modify selected text in a textarea -->

<html>

<head>

    <script type="text/javascript">

        function ModifySelection () {

            var textarea = document.getElementById("myArea");

            if ('selectionStart' in textarea) {

                    // check whether some text is selected in the textarea

                if (textarea.selectionStart != textarea.selectionEnd) {

                    var newText = textarea.value.substring (0, textarea.selectionStart) + 

                        "[start]" + textarea.value.substring(textarea.selectionStart, textarea.selectionEnd) + "[end]" +

                        textarea.value.substring (textarea.selectionEnd);

                    textarea.value = newText;

                }

            }

            else {  // Internet Explorer before version 9

                    // create a range from the current selection

                var textRange = document.selection.createRange ();

                    // check whether the selection is within the textarea

                var rangeParent = textRange.parentElement ();

                if (rangeParent === textarea) {

                    textRange.text = "[start]" + textRange.text + "[end]";

                }

            }

        }

    </script>

</head>

<body>

    <textarea id="myArea" cols="56" spellcheck="false" rows="12">Select some text within this field.</textarea>

    <button onclick="ModifySelection ()">Modify the current selection</button>

</body>

</html>

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Modify selected text in a textarea