react / react/react-native

OnEndReached calls on initial render and is called even if data is empty

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Component: FlatList Issue: Author Provided Repro Needs: Attention
Dominant language
C++
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Description

Description

OnEndReached calls on initial render when the app runs each time on the first time and is called even if data is empty

React Native Version

0.71.1

Output of npx react-native info

System:
OS: macOS 13.3.1
CPU: (8) arm64 Apple M1
Memory: 207.19 MB / 8.00 GB
Shell: 5.9 - /bin/zsh
Binaries:
Node: 18.16.0 - /opt/homebrew/opt/node@18/bin/node
Yarn: 1.22.19 - /opt/homebrew/bin/yarn
npm: 9.5.1 - /opt/homebrew/opt/node@18/bin/npm
Watchman: 2023.05.08.00 - /opt/homebrew/bin/watchman
Managers:
CocoaPods: 1.12.1 - /opt/homebrew/bin/pod
SDKs:
iOS SDK:
Platforms: DriverKit 22.2, iOS 16.2, macOS 13.1, tvOS 16.1, watchOS 9.1
Android SDK: Not Found
IDEs:
Android Studio: 2022.2 AI-222.4459.24.2221.9971841
Xcode: 14.2/14C18 - /usr/bin/xcodebuild
Languages:
Java: 11.0.19 - /usr/bin/javac
npmPackages:
@react-native-community/cli: Not Found
react: 18.2.0 => 18.2.0
react-native: 0.71.1 => 0.71.1
react-native-macos: Not Found
npmGlobalPackages:
react-native: Not Found

Steps to reproduce

create a project with the following code

Snack, code example, screenshot, or link to a repository


const HomeScreen = () => {


return (
<SafeAreaView style={{flex:1}}>
      <FlatList
        data={[]}
        renderItem={() => {
          return (
            <View
              style={{
                height: 100,
                backgroundColor: 'red',
                borderRadius: 20,
                marginBottom: 20,
              }}>
              <CustomText>welcome</CustomText>
            </View>
          );
        }}
        ListEmptyComponent={() => {
          return (
            <View>
            <Text>Empty List</Text>
            </View>
          );
        }}
        onEndReached={() => {
          console.log('onEndReached');
        }}
      />
  </SafeAreaView>
)

}

repo
https://github.com/Ahmedhamed77/RN-flatList72.0

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 FlatList onEndReached behavior using the provided empty-data example and the linked reproduction repository. Reproduce the initial render case, then trace the FlatList entry point to determine why the callback runs with no data; done means the callback no longer runs on initial render when the list is empty.

Written by the indexing model from the issue text.

Assessment

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

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