[2.0] An input bound with `value={signal()}` keeps text the handler rejected
维护者通常 1 天内回复
还没有人认领这个 Issue。
评估
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 新手友好度
- 48/100
- Issue 类型
- 缺陷
- 描述清晰度
- 基本清楚
- 活跃度
- 活跃
- 技术栈
- javascript, typescript
- 领域
- frontend
调研方向
Start by locating the value binding implementation and its tests in Solid's web package; the issue provides a jsdom reproduction using @solidjs/web. Check how the binding updates the DOM when an input handler leaves the signal unchanged, and compare that behavior with the reported unrelated-update case. Done means the rejected or truncated text reconciles with the bound state without reintroducing the unrelated-update behavior.
由索引模型根据 Issue 内容生成。
描述
Describe the bug
With <input value={v()} onInput={…}>, if the handler filters or truncates the input and the state ends up unchanged, the DOM keeps the text the user typed. The value binding only rewrites the input when its effect re-runs, so a rejected keystroke never reverts. React's controlled inputs revert to the state value.
Your Example Website or App
Minimal repro inline below (@solidjs/web, jsdom).
Steps to Reproduce the Bug or Issue
const [d, setD] = createSignal("");
const [s, setS] = createSignal("");
render(() => (
<>
<input id="a" value={d()} onInput={e => setD(e.currentTarget.value.replace(/[^0-9]/g, ""))} />
<input id="b" value={s()} onInput={e => setS(e.currentTarget.value.slice(0, 3))} />
</>
), container);
// simulate typing: input.value = text; input.dispatchEvent(new Event("input", { bubbles: true })); flush();
| Typed | State | DOM |
|---|---|---|
1 |
1 |
1 |
1a |
1 |
1a |
1a2 |
12 |
12 (state changed, so it's rewritten) |
abc (max 3) |
abc |
abc |
abcd (max 3) |
abc |
abcd |
Expected behavior
Either:
- after the handler runs, the DOM value is reconciled with the bound value even if the signal didn't change; or
- there's a documented pattern or primitive for controlled inputs.
Today's workaround is writing e.currentTarget.value = d() back by hand in the handler.
Screenshots or Videos
No response
Platform
- OS: macOS (Darwin 25.5)
- Browser: n/a (reproduced in Node v24.18.0 with vitest, importing source)
- Version: solid
next@ b0ad1df50 (2026-10-20, after 2.0.0-rc.16)
Additional context
- A common React pattern: number-only fields, max length and input masks.
- The converse problem also happens: OpenClaw found that a
valuebinding rewrites the input whenever its compiled effect re-runs, even with an equal value. For example, when it's grouped with other reactive attributes or read through a spread props object, unrelated updates wiped uncommitted text (https://github.com/openclaw/openclaw/blob/1989e3dc436/.agents/skills/solid/references/lessons.md#L9). Both point to the same root cause: thevaluebinding syncs the DOM when its effect runs, rather than by comparing the DOM against the bound value. - Not yet checked in a real browser: jsdom simulates typing by setting
valueand dispatchinginput, which mirrors what the browser does, but I haven't confirmed it in a real browser.
- 主要语言
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- 提交 Pull Request，并在描述里引用这个 Issue 编号。
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