CreateTextRange is not working in Chrome

Question

In this code, createRange is not working in Chrome. In IE it is working. Please help how to rectify in this. Is there any other property to work like create range. So that it will helpful for my project.

<script language=javascript>

    var isSelected;
    function markSelection ( txtObj ) {
      if ( txtObj.createTextRange ) {
        txtObj.caretPos = document.selection.createRange().duplicate();
        isSelected = true;
      }
    }

    function insertTag ( txtName, enclose ) {
        if(document.f_activity_email == null) {
            var tag = document.getElementById('EmailTokenID').value;
        }
        else {
            var formC = document.f_activity_email;
            var tag = formC.EmailTokenID.value;
        }
        var closeTag = tag;
        if ( enclose ) {
            var attribSplit = tag.indexOf ( ' ' );
            if ( tag.indexOf ( ' ' ) > -1 )
              closeTag = tag.substring ( 0, attribSplit );
        }
        if ( isSelected ) {
            var txtObj = eval ( "document.forms[0]." + txtName );
                if (txtObj.createTextRange && txtObj.caretPos) {
                    var caretPos = txtObj.caretPos;
                    caretPos.text = ( ( enclose ) ? "<"+tag+">"+caretPos.text+"</"+closeTag+">" : tag+caretPos.text );
                    markSelection ( txtObj );
                    if ( txtObj.caretPos.text=='' ) {
                     isSelected=false;
                    txtObj.focus();
                }
            }
      } else {
        // placeholder for loss of focus handler
      }
    }

Answer 1

CreateTextRange is a Microsoft specific function, but there is an easy work around.

Use createRange instead as in this post for example:

if (document.selection) { //IE
    var range = document.body.createTextRange();
    range.moveToElementText(document.getElementById(containerid));
    range.select();
} else if (window.getSelection) { //others
    var range = document.createRange();
    range.selectNode(document.getElementById(containerid));
    window.getSelection().addRange(range);
}