miyamoen / select-list

Yet another SelectList implementation

A SelectList is a non-empty list which always has exactly one element selected. It is one of zipper.

Inspired by these modules

• rtfeldman/selectlist
• turboMaCk/lazy-tree-with-zipper
• arowM/elm-reference

selectedMap is the feature function in this package. Use selectedMap in view.

    view : SelectList String -> Html Msg
    view selectList =
        ul [] <|
            SelectList.selectedMap
                (\position item ->
                    li [ onClick (Set item) ]
                        [ text <| toString <| SelectList.index item
                        , text <| toString <| SelectList.selected item
                        ]
                )
                selectList

Get a focused item and index from select list. Position describes whether it is selected, or not.

Compared with List.indexedMap.

    selectedMap : (Position -> SelectList a -> b) -> SelectList a -> List b
    indexedMap : (Int -> a -> b) -> List a -> List b

Unlike indexedMap, we can get full access to all elements in the list. And set new list to Model.

If you don't use non-empty list, use selectedMapForList that receives List instead of SelectList.

List.indexedMap is replaced with selectedMapForList .

example