Field reactivity (state and meta) docs #1207

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1. crutchcorn

   added

   type: docsThis issue is related to documentation, or lack thereof.This issue is related to documentation, or lack thereof.

   on Mar 4, 2025
2. karan042 commented on Jul 8, 2025

   

   karan042

   on Jul 8, 2025

   Last edited by karan042

   More actions

   Will this be required when accessing field from form.Field (e.g. taken from here) or only from useFormContext?

   <form.Field
     name="age"
     validators={{
       onChange: ({ value }) =>
         value < 13 ? 'You must be 13 to make an account' : undefined,
     }}
   >
     {(field) => (
       <>
         <label htmlFor={field.name}>Age:</label>
         <input
           id={field.name}
           name={field.name}
           value={field.state.value}
           type="number"
           onChange={(e) => field.handleChange(e.target.valueAsNumber)}
         />
         {!field.state.meta.isValid && (
           <em role="alert">{field.state.meta.errors.join(', ')}</em>
         )}
       </>
     )}
   </form.Field>
3. LeCarbonator commented on Jul 8, 2025

   

   LeCarbonator

   on Jul 8, 2025

   ContributorAuthor

   More actions

   Will this be required when accessing field from form.Field (e.g. taken from here) or only from useFormContext?

   <form.Field
   name="age"
   validators={{
   onChange: ({ value }) =>
   value < 13 ? 'You must be 13 to make an account' : undefined,
   }}

   {(field) => (
   <>
   Age:
   <input
   id={field.name}
   name={field.name}
   value={field.state.value}
   type="number"
   onChange={(e) => field.handleChange(e.target.valueAsNumber)}
   />
   {!field.state.meta.isValid && (
   {field.state.meta.errors.join(', ')}
   )}
   </>
   )}
   </form.Field>

   No. If you use the callback directly within form.Field, it will be rerendered when needed. This Issue refers to Form Composition, which means you extract it into its own component. That component will persist between rerenders, and therefore needs to manage the rerendering logic itself.

   <form.Field /* ... */>
     {field => {
        // this is up to date.
        return field.state.meta.isValid ? 'Yes' : 'No'
     }}
   </form.Field>
   
   <form.Field /* ... */>
      {field => {
         // you need to use useStore within YourTextField
        return <field.YourTextField  />
      }}
   </form.Field>
4. LeCarbonator

   added

   v1This issue has been created during v1 development.This issue has been created during v1 development.

   v2: needs investigationThis hasn't been confirmed or denied in v2 yet.This hasn't been confirmed or denied in v2 yet.

   v2This issue affects v2 as well.This issue affects v2 as well.

   and removed

   v2: needs investigationThis hasn't been confirmed or denied in v2 yet.This hasn't been confirmed or denied in v2 yet.

   on Aug 9, 2026
5. LeCarbonator

   closed this as completedin #2445on Oct 25, 2026
6. LeCarbonator

   added a commit that references this issue on Oct 27, 2026

   docs(react): document field state reactivity (TanStack#2445)

   ...

   This issue will close once commit 12eea6d is merged into the 'main' branch.

   12eea6d