function keyDownListener(event)
    {
        if (isEnterKey(event))
            eventListener(event);
    }
Creates an input element under the parentElement with the given id and defaultText.
@param {!Element} parentElement
@param {string} id
@param {string} defaultText
@param {function(*)} eventListener
@param {boolean=} numeric
@param {string=} size
@return {!Element} element