textFieldValue based on event delegation

Event delegation version of textFieldValue

    function textFieldValue(parentElement, inputFieldSelector) {
        return parentElement.asEventStream("keyup input").filter(isNotEnter).
            merge(parentElement.asEventStream("cut paste").delay(1)).
            merge(autofillPoller()).
            map(getValue).toProperty(getValue()).skipDuplicates();

        function getValue() {
            var inputField = parentElement.find(inputFieldSelector)
            return _.isEmpty(inputField) ? "" : inputField.val();
        }

        function autofillPoller() {
            return Bacon.interval(100).take(20).map(getValue).filter(nonEmpty).take(1);
        }

        function nonEmpty(x) { return x && x.length > 0; }
    }