A tiny hooks library allows ones to control the component evaluation.
Install with spago
spago install halogen-use-trigger-hooksYou can imperatively force a re-render:
app :: forall q i o m. MonadEffect m => H.Component q i o m
app = Hooks.component \_ _ -> Hooks.do
{ triggerEval } <- useTrigger
Hooks.pure do
HH.div []
[ HH.button
[ HE.onClick \_ -> triggerEval ]
[ HH.text "I'll trigger eval!" ]
]Clicking the button will trigger a component evaluation (and thus re-rendering). You can also run some effectful code on the next tick:
app :: forall q i o m. MonadEffect m => H.Component q i o m
app = Hooks.component \_ _ -> Hooks.do
{ onNextTick } <- useTrigger
let
handleClick = do
onNextTick \_ -> do
Console.log "I clicked in the previous tick."
Hooks.pure do
HH.div []
[ HH.button
[ HE.onClick \_ -> handleClick ]
[ HH.text "I'll trigger eval on next tick!" ]
]Clicking the button does not trigger an immediate re-render; instead, handleClick will run on the next tick (after a component state change).
