input.scala

  def cmpInput444(lbl: String, hdl: Handler[String], props: VDomModifier, events: VDomModifier) =
      div( id := "txt" + lbl,
        float.left, props,
        label( lbl, props ),
        input ( key := "txt" + lbl,
          value <-- hdl.map ( t => if(t == "0") "" else t ),
          onKeyUp.map { k =>
            val txt = k.currentTarget.asInstanceOf[html.Input]
            if(txt.value == "") "0" else txt.value
          } --> hdl,
          //onChange.target.value --> hdl,
          props, events
        )
      )

  val getIdComparative: Observable[String] = (txtEjercicio: Observable[Int], txtFolio: Observable[Int])
        .parMapN{ case (ejercicio: Int, folio: Int) =>
          folio + "-" + ejercicio + "-" + "ADQ2"
        }

  val ver = SinkObserver.create[String]{ id => store.store.onNext(store.UpdateIdComparative(id))
  }

  val onChangeDebounce = onKeyUp.debounce( 500 milliseconds).transform (
              _.lift[Observable].withLatestFrom(getIdComparative)
          { case (event, id) => id } ) --> ver  // --> store.store

cmpInput444("Folio", txtFolio.mapHandler[String]( _.toInt )(_.toString), VDomModifier(width:="75px"), VDomModifier(onChangeDebounce))