SHtml.idMemoize

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Andreas Joseph Krogh

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Aug 15, 2017, 4:43:17 PM8/15/17

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Hi.

I very often need to use SHtml.idMemoize in places where I want to replace the markup, rather than setting its innerHTML (which is what SHtml.idMemoize does).

I have a custom variant doing just that:

def idMemoizeReplace(f: IdMemoizeTransform => NodeSeqFuncOrSeqNodeSeqFunc): IdMemoizeTransform = {
   new IdMemoizeTransform {
      var latestElem: Elem = <span/>
      val latestKids: NodeSeq = NodeSeq.Empty

      var latestId = Helpers.nextFuncName

      private def fixElem(e: Elem): Elem = {
         e.attribute("id") match {
            case Some(id) => latestId = id.text ; e
            case None => e % ("id" -> latestId)
         }
      }

      def apply(ns: NodeSeq): NodeSeq =
         Helpers.findBox(ns){e => latestElem = fixElem(e); Full(e)}.
         map(ignore => applyAgain()).openOr(NodeSeq.Empty)

      def applyAgain(): NodeSeq =
         f(this)(latestElem)

      def setHtml(): JsCmd = Replace(latestId, f(this)(latestElem))
   }
}