Wrapping a selected text node with span

I want to wrap a selected text in a div container with span, is it possible?

A user will select a text and will click a button, on button click event I want to wrap that selected text with span element. I can get the selected text using window.getSelection() but how to know its exact position in DOM structure?

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If the selection is completely contained within a single text node, you can do this using the surroundContents() method of the range you obtain from the selection. However, this is very brittle: it does not work if the selection cannot logically be surrounded in a single element (generally, if the range crosses node boundaries, although this is not the precise definition). To do this in the general case, you need a more complicated approach.

Also, DOM Range and window.getSelection() are not supported in IE < 9. You'll need another approach again for those browsers. You can use a library such as my own Rangy to normalize browser behaviour and you may find the class applier module useful for this question.

Simple surroundContents() example jsFiddle: http://jsfiddle.net/VRcvn/

Code:

function surroundSelection(element) {
    if (window.getSelection) {
        var sel = window.getSelection();
        if (sel.rangeCount) {
            var range = sel.getRangeAt(0).cloneRange();
            range.surroundContents(element);
            sel.removeAllRanges();
            sel.addRange(range);
        }
    }
}

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function wrapSelectedText() {       
    var selection= window.getSelection().getRangeAt(0);
    var selectedText = selection.extractContents();
    var span= document.createElement("span");
    span.style.backgroundColor = "yellow";
    span.appendChild(selectedText);
    selection.insertNode(span);
}

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam rhoncus  gravida magna, quis interdum magna mattis quis. Fusce tempor sagittis  varius. Nunc at augue at erat suscipit bibendum id nec enim. Sed eu odio  quis turpis hendrerit sagittis id sit amet justo. Cras ac urna purus,  non rutrum nunc. Aenean nec vulputate ante. Morbi scelerisque sagittis  hendrerit. Pellentesque habitant morbi tristique senectus et netus et  malesuada fames ac turpis egestas. Nulla tristique ligula fermentum  tortor semper at consectetur erat aliquam. Sed gravida consectetur  sollicitudin. 

<input type="button" onclick="wrapSelectedText();" value="Highlight" />

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it is possible. You need to use the range API and the Range.surroundContents() method. It places the node the content is wrapped in at the start of the specified range. see https://developer.mozilla.org/en/DOM/range.surroundContents

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