TextInput `setSelection` "ignored" when TextInput has gone out of focus
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Descripción
Description
When assigning a ref to TextInput there is a setSelection method, which in general works great for changing the selection of the input, without needing to set a selection prop.
However, on android, there is an edge case where when the TextInput has gone out of focus while calling setSelection the new selection is ignored.
See this video, where we have simple code that adds an emoji in the place of the selection:
Now we changed the code a bit and the TextInput will actually lose focus while we are changing the text. You can see that the selection is wrong. We said the selection to have a range of 0, but it still has the previous range:
I see how I could fix this by using a selection prop. But this would cause other issues. I could see how I can hack my way around it by further waiting before I call setSelection, however, this can create UI glitches.
I would just assume it to work when I called setSelection.
On iOS something similar can be observed. Here the selection cursor gets set to the end (although onSelectionChange isn't reporting necessarily a change, there is one):
Version
0.70.3
Output of npx react-native info
System:
OS: macOS 12.6
CPU: (20) x64 Intel(R) Core(TM) i9-10910 CPU @ 3.60GHz
Memory: 480.50 MB / 48.00 GB
Shell: 5.8.1 - /bin/zsh
Binaries:
Node: 16.15.1 - ~/.nvm/versions/node/v16.15.1/bin/node
Yarn: 1.22.19 - ~/.nvm/versions/node/v16.15.1/bin/yarn
npm: 8.11.0 - ~/.nvm/versions/node/v16.15.1/bin/npm
Watchman: 2022.09.26.00 - /usr/local/bin/watchman
Managers:
CocoaPods: 1.11.3 - /usr/local/bin/pod
SDKs:
iOS SDK:
Platforms: DriverKit 21.4, iOS 16.0, macOS 12.3, tvOS 16.0, watchOS 9.0
Android SDK:
API Levels: 26, 28, 29, 30, 31, 32
Build Tools: 26.0.3, 28.0.3, 29.0.2, 29.0.3, 30.0.2, 30.0.3, 31.0.0, 32.0.0, 33.0.0
System Images: android-26 | Google APIs Intel x86 Atom_64, android-27 | Google Play Intel x86 Atom, android-28 | Google APIs Intel x86 Atom, android-30 | ARM 64 v8a, android-30 | Google APIs Intel x86 Atom, android-30 | Google Play Intel x86 Atom
Android NDK: 21.4.7075529
IDEs:
Android Studio: Dolphin 2021.3.1 Patch 1 Dolphin 2021.3.1 Patch 1
Xcode: 14.0.1/14A400 - /usr/bin/xcodebuild
Languages:
Java: javac 17 - /usr/bin/javac
npmPackages:
@react-native-community/cli: Not Found
react: 18.1.0 => 18.1.0
react-native: 0.70.3 => 0.70.3
react-native-macos: Not Found
npmGlobalPackages:
*react-native*: Not Found
Steps to reproduce
- Clone the repository
- Run
yarn - Run
yarn android - When the app opens, click inside the TextInput and select any text
- Then click on "Open emoji modal"
- Click on "Add emoji"
Important note: I assume this bug is a race condition as it doesn't happen 100% of the time you try!
Snack, code example, screenshot, or link to a repository
https://github.com/hannojg/TextInputSetSelectionReproduction
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 repositorio de reproducción en https://github.com/hannojg/TextInputSetSelectionReproduction. Sigue los pasos indicados para yarn, Android, TextInput, emoji modal y Add emoji, y después compara el comportamiento de Android y iOS cuando se pierde el foco. Se considera terminado cuando setSelection aplica de forma fiable el rango solicitado después de que cambie el texto, incluido el caso notificado de pérdida de foco.
Escrito por el modelo de indexación a partir del texto del issue.
Evaluación
- Stack tecnológico
- react-native
- Área
- mobile
- Tipo de issue
- Error
- Dificultad
- 4/5
- Tiempo estimado
- 3-5 días
- Estado de actividad
- Estancado
- Claridad
- Necesita aclaración
- Aptitud para principiantes
- 35/100