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fec-form-handling

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Use when building or reviewing substantial forms with React Hook Form, Zod schemas, typed validation, dynamic fields, controlled third-party inputs, file upload, multi-step flows, dependent validation, or form performance. Do not use for trivial 1-3 field forms without validation; Chinese triggers include form, form validation, dynamic fields.

skills/fec-form-handling/SKILL.md

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Nov 8, 2026
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# Form processing

## Purpose

Manage form status, verification and submission to avoid lags in complex form input.

## Procedure

1. First identify the framework, existing form library of the project, schema verification library, component library and complexity; then introduce special form solutions when there are 10+ fields, dynamic fields, linkage verification, file upload, multi-step process or input lag.
2. Select according to project stack: React can consider React Hook Form + Zod; Vue can consider vee-validate / FormKit + Zod, Yup or Valibot; simple forms can use the framework's native state and basic verification.
3. Use runtime schema or explicit validation functions to guard external input boundaries; TypeScript types can be deduced from the schema, but don’t just write TS types.
4. Clarify default values, field registration, controlled/uncontrolled boundaries and component library adaptation; use `aria-invalid`, `aria-describedby` and `role="alert"` for error prompts.
5. Handle loading, server-side errors, repeated submissions and resets when submitting; use local subscriptions and sub-component isolation to control re-rendering of large forms.
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