react / react/react-native

SectionList's `onScrollToIndexFailed` does not catch requested sectionIndex & itemIndex

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Component: SectionList Issue: Author Provided Repro Needs: Attention Needs: Version Info
Dominant language
C++
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Description

Description

onScrollToIndexFailed returns index,heighestMeasuredIndex, and averageItemHeight, which is enough in FlatList.
but in sectionList it should return requested sectionIndex and itemIndex, and heighestMeasured section & item index in addition to flat index, because we have only scrollToLocation method available for sectionList and section and item index params are needed.

Steps to reproduce

run the snack, press on scroll to no where, you will see the alert

React Native Version

0.76.3

Affected Platforms

Runtime - Android, Runtime - iOS, Runtime - Web, Runtime - Desktop, Build - MacOS, Build - Windows, Build - Linux

Output of npx react-native info
System:
  OS: Windows 11 10.0.22000
  CPU: (8) x64 Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz
  Memory: 8.47 GB / 15.89 GB
Binaries:
  Node:
    version: 23.0.0
    path: C:\Program Files\nodejs\node.EXE
  Yarn:
    version: 1.22.0
    path: C:\Program Files (x86)\Yarn\bin\yarn.CMD
  npm:
    version: 10.9.0
    path: C:\Program Files\nodejs\npm.CMD
  Watchman:
    version: 20241027.093345.0
    path: E:\Software\Watchman\bin\watchman.EXE
SDKs:
  Android SDK: Not Found
  Windows SDK:
    AllowDevelopmentWithoutDevLicense: Enabled
    AllowAllTrustedApps: Disabled
IDEs:
  Android Studio: Not Found
  Visual Studio: Not Found
Languages:
  Java:
    version: 21.0.3
    path: /c/Program Files/Eclipse Adoptium/jdk-21.0.3.9-hotspot/bin/javac
  Ruby: Not Found
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 18.3.1
    wanted: 18.3.1
  react-native:
    installed: 0.76.2
    wanted: 0.76.2
  react-native-windows: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found
Stacktrace or Logs
scroll to index failed
Reproducer

https://snack.expo.dev/@arasrezaie/sectionlist-example

Screenshots and Videos

No response

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 linked Expo Snack and reproduce the failed SectionList scroll using onScrollToIndexFailed. Trace the SectionList callback contract and its scrollToLocation inputs, then verify that the failure result includes the requested and highest measured section and item indices in addition to the flat index, height, and average item height.

Written by the indexing model from the issue text.

Assessment

Tech stack
react-native
Domain
mobile
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
38/100

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