react / react/react-native

Can't prevent default input in TextInput in controlled component

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还没有人认领这个 Issue。

Component: TextInput Issue: Author Provided Repro Needs: Attention
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描述

Description

The comment in #24585 suggested creating another issue for this. It's also similar to #23578.

The problem is that you can't prevent the default behavior of controlled TextInput in ReactNative.

I've asked this on StackOverflow: How to prevent adding typed keys into controlled TextInput in React-Native?. But looking at similar issues this is a bug (or missing feature) in ReactNative.

React Native Version

0.71.8

Output of npx react-native info

info Fetching system and libraries information...
System:
OS: Linux 5.19 Ubuntu 22.04.2 LTS 22.04.2 LTS (Jammy Jellyfish)
CPU: (8) x64 Intel(R) Core(TM) i5-10210U CPU @ 1.60GHz
Memory: 19.22 GB / 30.98 GB
Shell: 5.1.16 - /bin/bash
Binaries:
Node: 20.3.0 - ~/.nvm/versions/node/v20.3.0/bin/node
Yarn: 1.22.19 - ~/.nvm/versions/node/v20.3.0/bin/yarn
npm: 9.6.7 - ~/.nvm/versions/node/v20.3.0/bin/npm
Watchman: Not Found
SDKs:
Android SDK: Not Found
IDEs:
Android Studio: Not Found
Languages:
Java: 1.8.0_362 - /usr/bin/javac
npmPackages:
@react-native-community/cli: Not Found
react: 18.2.0 => 18.2.0
react-native: 0.71.8 => 0.71.8
npmGlobalPackages:
react-native: Not Found
info React Native v0.72.1 is now available (your project is running on v0.71.8).
info Changelog: https://github.com/facebook/react-native/releases/tag/v0.72.1
info Diff: https://react-native-community.github.io/upgrade-helper/?from=0.71.8
info For more info, check out "https://reactnative.dev/docs/upgrading".

Steps to reproduce

Type the number into the input field with the code below. The code works on the Expo playground but fails on Android Emulator (didn't tested on a real device).

From the demo I expect the input to not change.

Snack, code example, screenshot, or link to a repository
const ControlledComponent = () => {
  const [state, setState] = useState('0.00');
  const cursor = 1;
  return (
    <TextInput
      ref={ref}
      autoFocus
      onKeyPress={() => { /* empty */ }}
      selection={{start: cursor, end: cursor}}
      value={state}
      keyboardType="numeric"
    />
  );
};

event.preventDefault() also doesn't work:

const ControlledComponent = () => {
  const [state, setState] = useState('0.00');
  const cursor = 1;
  return (
    <TextInput
      ref={ref}
      autoFocus
      onKeyPress={(e) => { e.preventDefault() }}
      selection={{start: cursor, end: cursor}}
      value={state}
      keyboardType="numeric"
    />
  );
};

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  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

调研方向

未指定源文件或测试。首先在 Android 上运行提供的受控 TextInput 示例,并将其与 Expo 的行为进行比较;当按下按键或 onKeyPress 调用 preventDefault() 时,受控输入保持不变,即视为完成。

由索引模型根据 Issue 内容生成。

评估

技术栈
react-native
领域
mobile
Issue 类型
缺陷
难度
4/5
预计耗时
3-5 天
活跃度
停滞
描述清晰度
基本清楚
新手友好度
35/100

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