Hacktoberfest 2026：維護者為十月標記出來的 issue，仍然開放、適合新手。 瀏覽 Hacktoberfest issue

bug(mat-checkbox): with Signal Forms `required()`, MatCheckbox's own validator adds a duplicate `required` error that hides the schema error message

未關閉
  • 哪裡不對？
#33,945 1 則留言 1 個 reaction 已指派 0 人 在 GitHub 檢視

維護者通常 1 天內回覆

還沒有人認領這個 Issue。

評估

難度
4/5
預估耗時
3-5 天
新手友好度
48/100
Issue 類型
缺陷
描述清晰度
基本清楚
活躍度
活躍
技術堆疊
angular, typescript
領域
frontend, testing

研究方向

Start by tracing how Signal Forms errors are combined with the MatCheckbox validator; the issue names MatCheckbox.validate() and CompatValidationError but does not identify source files or tests. Reproduce with the linked StackBlitz and inspect the error output. Done means the field exposes only the schema’s required error, including its custom message.

由索引模型根據 Issue 內容生成。

描述

area: material/checkbox P3
Is this a regression?
  • Yes, this behavior used to work in the previous version
The previous version in which this bug was not present was

No response

Description

When a mat-checkbox is bound to a Signal Forms field with [formField] and the schema uses required(), the field ends up with two errors of kind required:

  1. the schema error from required(path, { message }) - has the custom message;
  2. a CompatValidationError (kind required, no message) produced by MatCheckbox.validate().

This happens with many components which have 'required' input and validate method from Validators interface.

Reproduction

StackBlitz link: https://stackblitz.com/edit/1sinlau9-qd7bhr37?file=src%2Fexample%2Fcheckbox-signal-forms-example.ts
Steps to reproduce:

  1. Open the console
  2. Click the 'Show errors' button. The first getError('required) log shows kind: required and message: undefined. The second errors() log shows 2 errors.

As the result nothing is rendered

Expected Behavior
  • The field has a single required error, the one from the schema.
Actual Behavior
  • errors() contains two required errors: first a CompatValidationError from MatCheckbox.validate() (message is undefined), then the schema error.
  • getError('required') returns the first one, so getError('required')?.message is undefined and nothing is rendered.
Environment
  • Angular: 22.0.6
  • CDK/Material: 22.0.4
  • Browser(s): Google Chrome Version 154.0.8037.98
  • Operating System: MacOs 27.0
主要語言
TypeScript
星號
25k
分支
6.8k
平均合併
1 天 5 小時
30 天內合併 PR
67

環境準備

  • 沒有 Dockerfile 或 Docker Compose 檔案
  • 沒有 Pull Request 範本
  • 閱讀貢獻指南

從這裡開始

  1. 先讀完整個 Issue，再讀專案的貢獻指南。
  2. 在 Issue 下留言說明你要接手 —— 這能避免兩個人做同樣的事。
  3. Fork 儲存庫，在一個分支上完成修改。
  4. 送出 Pull Request，並在描述裡引用這個 Issue 編號。

angular/components 的其他 Issue

查看 angular/components 的全部 Issue

相似的 Issue

更多 TypeScript Issue

把新 issue 寄到你的電子郵件信箱

精選適合新手參與的 GitHub issue 摘要。