scrollToIndex out of range error

[heidtjoh]

When scrolling very fast to the top of large lists (example settings: length of options array >= 100, deceleration_rate="normal"), the following error can occur on android phones (tested on different phones):

Fatal Exception: com.facebook.react.common.JavascriptException Invariant Violation: scrollToIndex out of range: requested index -1 but minimum is 0

[c-goettert]

I am facing the same issue (also on iOS Simulator). I just need to "swipe up" a few times when I reached the first item, then the error occurs.

[erksch]

I was also able to reproduce this on iOS. I'll look at it this week.

[erksch]

The problem is here:

const handleMomentumScrollEnd = (
    event: NativeSyntheticEvent<NativeScrollEvent>,
  ) => {
    const offsetY = event.nativeEvent.contentOffset.y;
    let index = Math.floor(Math.floor(offsetY) / itemHeight);
    const last = Math.floor(offsetY % itemHeight);
    if (last > itemHeight / 2) index++;

    if (index !== selectedIndex) {
      onChange(index);
    }
  };

In some cases, especially on iOS event.nativeEvent.contentOffset.y is actually negative. This is properly due to the list's bounciness. The index might also overshoot in the other direction when scrolling down.

[erksch]

Released the fix in 0.6.0