@base-ui-components/react/esm/field/useField.js

Base UI is a library of headless ('unstyled') React components and low-level hooks. You gain complete control over your app's CSS and accessibility features.

import * as ReactDOM from 'react-dom';
import { useIsoLayoutEffect } from '@base-ui-components/utils/useIsoLayoutEffect';
import { useStableCallback } from '@base-ui-components/utils/useStableCallback';
import { getCombinedFieldValidityData } from "./utils/getCombinedFieldValidityData.js";
import { useFormContext } from "../form/FormContext.js";
import { useFieldRootContext } from "./root/FieldRootContext.js";
export function useField(params) {
  const {
    enabled = true,
    value,
    id,
    name,
    controlRef,
    commit
  } = params;
  const {
    formRef
  } = useFormContext();
  const {
    invalid,
    markedDirtyRef,
    validityData,
    setValidityData
  } = useFieldRootContext();
  const getValue = useStableCallback(params.getValue);
  useIsoLayoutEffect(() => {
    if (!enabled) {
      return;
    }
    let initialValue = value;
    if (initialValue === undefined) {
      initialValue = getValue();
    }
    if (validityData.initialValue === null && initialValue !== null) {
      setValidityData(prev => ({
        ...prev,
        initialValue
      }));
    }
  }, [enabled, setValidityData, value, validityData.initialValue, getValue]);
  useIsoLayoutEffect(() => {
    if (!enabled || !id) {
      return;
    }
    formRef.current.fields.set(id, {
      getValue,
      name,
      controlRef,
      validityData: getCombinedFieldValidityData(validityData, invalid),
      validate() {
        let nextValue = value;
        if (nextValue === undefined) {
          nextValue = getValue();
        }
        markedDirtyRef.current = true;
        // Synchronously update the validity state so the submit event can be prevented.
        ReactDOM.flushSync(() => commit(nextValue));
      }
    });
  }, [commit, controlRef, enabled, formRef, getValue, id, invalid, markedDirtyRef, name, validityData, value]);
  useIsoLayoutEffect(() => {
    const fields = formRef.current.fields;
    return () => {
      if (id) {
        fields.delete(id);
      }
    };
  }, [formRef, id]);
}