Scala lift type mismatch?

Question

I am programming a webapp at the moment and I want to use a value from a submit form but get a type mismatch:

type mismatch; found : connectfour.Board=> Option[Int] required: () => Any

My code looks like this:

var value=0
 "name=value" #> SHtml.onSubmit(s => asInt(s).foreach(value= _)) &
 // when the form is submitted, process the variable
"type=submit" #> SHtml.onSubmitUnit(askForHumanMove)

and my askForHumanMove method:

def askForHumanMove(board: connectfour.Board): Option[Int] = {
    Some(value)        
}

Hope somebody can help me with this type mismatch.

Thank you!

Best regards, John

Answer 1

It looks to me that onSubmitUnit accepts a () => Any as a parameter. But you are passing a method which is being lifted into a function Board => Option[Int]. These types are not compatible.

Do you have the relevant instance of Board in scope at the point of calling the onSubmitUnit method? If so, the fix is simple:

"type=submit" #> SHtml.onSubmitUnit( () => askForHumanMove(board) )