Filter [Node] to [Element] with ghcjs-dom

Question

I am using ghcjs-dom. How can I filter the elements out of an array of nodes?

import GHCJS.DOM.Types

nodesToElements :: [Node] -> [Element]
nodesToElements = ??

or

nodesToElements :: [Node] -> IO [Element]
nodesToElements = ??

@dfeuer there is no documentation that I can find. I found some examples by googling "ghcjs-dom". — michaelmesser, Aug 02 '16 at 11:53

score 1 · Accepted Answer · edited Aug 02 '16 at 06:43

1

import GHCJS.DOM.Types
import Data.Maybe (mapMaybe)

nodeToElement :: Node -> Maybe Element
nodeToElement node = if node `isA` gTypeElement
                     then Just $ castToElement node
                     else Nothing

nodesToElements :: [Node] -> [Element]
nodesToElements = mapMaybe nodeToElement

edited Aug 02 '16 at 06:43

Cactus

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answered Aug 02 '16 at 01:54

michaelmesser

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Filter [Node] to [Element] with ghcjs-dom

1 Answers1