How to get the cursor position inside the iframe having text in it.

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Javascript

Visual-Studio

I have a iframe embedded with html, I want to insert the text at specific cursor position inside this iframe. I tried with following java script code but no luck.

function getCaretCharacterOffsetWithin(element) {
    var doc = element.ownerDocument || element.document;
    var win = doc.defaultView || doc.parentWindow;
    var sel, range, preCaretRange, caretOffset = 0;
    if (typeof win.getSelection != "undefined") {
        sel = win.getSelection();
        if (sel.rangeCount) {
            range = sel.getRangeAt(0);
            preCaretRange = range.cloneRange();
            preCaretRange.selectNodeContents(element);
            preCaretRange.setEnd(range.endContainer, range.endOffset);
            caretOffset = preCaretRange.toString().length;
        }
    } else if ((sel = doc.selection) && sel.type != "Control") {
        range = doc.selection.createRange();
        preCaretRange = doc.body.createTextRange();
        preCaretRange.moveToElementText(element);
        preCaretRange.setEndPoint("EndToEnd", textRange);
        caretOffset = preCaretTextRange.text.length;
    }
    return caretOffset;
}

The above code ideally return me the cursor position where I would place the text.

Thanks in advance