meliorence / meliorence/react-native-snap-carousel

Access snapToNext and snapToPrev inside renderItem.

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#665 2 comments 2 reactions 0 assignees View on GitHub

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Dominant language
JavaScript
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Description

Is this a bug report, a feature request, or a question?

Question

I want to know if i can access those functions inside my renderItem using useRef;

const MyCarousel = () => {
  const carouselRef = useRef(null);
  ...
  const onPrev = useCallback(() => {
    if (carouselRef && carouselRef.current) {
      carouselRef.current.snapToPrev();
    }
  }, [carouselRef]);

  const onNext = useCallback(() => {
    if (carouselRef && carouselRef.current) {
      carouselRef.current.snapToNext();
    }
  }, [carouselRef]);
  ...

  const renderItem = useCallback(
    ({ item, index }) => {
      return (
        <>
          <SwitchersContainer>
            <Switcher onPress={onPrev)} />
            ...
            <Switcher onPress={onNext} />
          </DaySwitchersContainer>
        </>
      );
    },
    [onNext, onPrev],
  );
  ...

  return (
    <Carousel<string>
      ref={carouselRef}
      ...
      renderItem={renderItem}
      ...
    />
  );
}

This solution is not working, but if I take of the switcher from renderItem it works!

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the Carousel ref API and the renderItem callback shown in the issue, then reproduce the useRef behavior with the Switcher controls inside renderItem. Compare it with the working case where the switchers are outside renderItem; done means the supported behavior and required change or limitation are clearly established.

Written by the indexing model from the issue text.

Assessment

Tech stack
javascript, react-native
Domain
mobile
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
20/100

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