Unexpected scroll behaviors when using FlatList
Nadie ha tomado este issue todavía.
- Lenguaje dominante
- C++
- Estrellas
- 127k
- Forks
- 25.3k
- Merge medio
- 1 d 23 h
- PR fusionados (30 d)
- 4
Descripción
Description
Content teleports to right when over-scrolling, if the content is less.
What I am trying to do? 🤔
Two FlatList components are nested inside a ScrollView for a custom component to emulate a grid like structure.
Example:
_________
|
|
[] [] [] | [] []
[] [] [] | [] []
[] [] [] | [] []
[] [] [] | []
|
|
▔▔▔▔▔
[] represent grid items and | represents edge of the screen. The items are accessed by scrolling horizontally.
How am I doing this? ❓
export function HorizontalRowList({
rows, data, renderItem,
bounces = false,
itemSeparatorComponent,
style, columnStyle
}) {
const columns = divideArrayIntoChunks(rows, data);
return (
<ScrollView style={{ ...style, overflow: "hidden" }}
showsVerticalScrollIndicator={false}
nestedScrollEnabled={true}
alwaysBounceHorizontal={bounces}
bounces={bounces}>
<FlatList data={columns}
style={{ borderColor: "blue", borderWidth: 1, overflow: "hidden" }}
ItemSeparatorComponent={itemSeparatorComponent}
nestedScrollEnabled={true}
legacyImplementation={false}
initialNumToRender={columns.length}
horizontal={true}
alwaysBounceHorizontal={bounces}
bounces={bounces}
renderItem={(column) => {
return <FlatList data={column.item}
style={columnStyle}
ItemSeparatorComponent={itemSeparatorComponent}
legacyImplementation={false}
bounces={bounces}
renderItem={({ item }) => {
return renderItem(item);
}} />
}} />
</ScrollView >
)
}
function divideArrayIntoChunks(chunkSize, array) {
const chuckedArray = []
for (let i = 0; i < array.length; i += chunkSize) {
chuckedArray.push(array.slice(i, i + chunkSize))
}
return chuckedArray;
}
ScrollView to disable individual vertical scroll bars for the columns when the component has less space.
The first FlatList to enable horizontal behavior of grid
The second FlatList component are columns. The component can be given used to render list of varying sizes.
When the bug occurs? 🪲
The bug happens when data is less and rows to render are more. This causes the array to be chunked in the following way:
[] [] |
[] [] |
[] [] |
[] |
Steps to reproduce
- Create a new project
- Add the code for
HorizontalRowListcomponent given in the description - Import and add the component in App.js
- Create a random list of strings or any other object
- Pass this list to data attribute of
HorizontalRowList - Set the row attribute in such a way that there is considerable space to the right of the
HorizontalRowList - Try scrolling
HorizontalRowListand observe the behavior
React Native Version
0.73.6
Affected Platforms
Runtime - Android
Output of npx react-native info
System:
OS: Windows 11 10.0.22631
CPU: (8) x64 11th Gen Intel(R) Core(TM) i5-1155G7 @ 2.50GHz
Memory: 5.68 GB / 15.78 GB
Binaries:
Node:
version: 21.0.0
path: C:\Program Files\nodejs\node.EXE
Yarn: Not Found
npm:
version: 10.4.0
path: C:\Program Files\nodejs\npm.CMD
Watchman: Not Found
SDKs:
Android SDK: Not Found
Windows SDK: Not Found
IDEs:
Android Studio: Not Found
Visual Studio:
- 17.8.34408.163 (Visual Studio Community 2022)
Languages:
Java: Not Found
Ruby: Not Found
npmPackages:
"@react-native-community/cli": Not Found
react:
installed: 18.2.0
wanted: 18.2.0
react-native:
installed: 0.73.6
wanted: ^0.73.6
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
No Errors
Reproducer
Please check this snack
https://staging-snack.expo.dev/kawPQ53xi5xNUpxnPKYfB
Screenshots and Videos
Guía de contribución
Primeros pasos
- Lee el issue completo y luego la guía de contribución del proyecto.
- Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
- Haz un fork del repositorio y trabaja en una rama.
- Abre un pull request que haga referencia al número del issue.
Línea de trabajo
Comienza con el ejemplo HorizontalRowList en App.js y el Snack enlazado, usando React Native 0.73.6 en Android. Reproduce el caso de un ScrollView y un FlatList anidados en el que los datos son más cortos que el número de filas solicitado y, después, sigue el comportamiento del desplazamiento. El trabajo estará terminado cuando el contenido deje de teletransportarse horizontalmente al desplazar más allá del límite.
Escrito por el modelo de indexación a partir del texto del issue.
Evaluación
- Stack tecnológico
- javascript, react-native
- Área
- mobile
- Tipo de issue
- Error
- Dificultad
- 4/5
- Tiempo estimado
- 3-5 días
- Estado de actividad
- Estancado
- Claridad
- Bastante claro
- Aptitud para principiantes
- 35/100