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Html.Keyed

A keyed node helps optimize cases where children are getting added, moved, removed, etc. Common examples include:

  • The user can delete items from a list.
  • The user can create new items in a list.
  • You can sort a list based on name or date or whatever.

When you use a keyed node, every child is paired with a string identifier. This makes it possible for the underlying diffing algorithm to reuse nodes more efficiently.

Keyed Nodes

node : String -> List (Attribute msg) -> List ( String, Html msg ) -> Html msg

Works just like Html.node, but you add a unique identifier to each child node. You want this when you have a list of nodes that is changing: adding nodes, removing nodes, etc. In these cases, the unique identifiers help make the DOM modifications more efficient.

Commonly Keyed Nodes

ol : List (Attribute msg) -> List ( String, Html msg ) -> Html msg
ul : List (Attribute msg) -> List ( String, Html msg ) -> Html msg
module Html.Keyed exposing
  ( node
  , ol
  , ul
  )
{-| A keyed node helps optimize cases where children are getting added, moved,
removed, etc. Common examples include:

  - The user can delete items from a list.
  - The user can create new items in a list.
  - You can sort a list based on name or date or whatever.

When you use a keyed node, every child is paired with a string identifier. This
makes it possible for the underlying diffing algorithm to reuse nodes more
efficiently.

# Keyed Nodes
@docs node

# Commonly Keyed Nodes
@docs ol, ul
-}


import Html exposing (Attribute, Html)
import VirtualDom


{-| Works just like `Html.node`, but you add a unique identifier to each child
node. You want this when you have a list of nodes that is changing: adding
nodes, removing nodes, etc. In these cases, the unique identifiers help make
the DOM modifications more efficient.
-}
node : String -> List (Attribute msg) -> List ( String, Html msg ) -> Html msg
node =
  VirtualDom.keyedNode


{-|-}
ol : List (Attribute msg) -> List ( String, Html msg ) -> Html msg
ol =
  node "ol"


{-|-}
ul : List (Attribute msg) -> List ( String, Html msg ) -> Html msg
ul =
  node "ul"