How-to select text of element using javascript

select-text.js

/**
 * Select text of element by element id
 * @param element
 */
function selectText(elementId)
{
	var
	    doc = document,
	    text = doc.getElementById(elementId),
	    range,
	    selection;

	if (doc.body.createTextRange)
	{
	    range = document.body.createTextRange();
	    range.moveToElementText(text);
	    range.select();
	}
	else if (window.getSelection)
	{
	    selection = window.getSelection();
	    range = document.createRange();
	    range.selectNodeContents(text);
	    selection.removeAllRanges();
	    selection.addRange(range);
	}
}