import React , { useEffect } from "react" ; import get from "lodash/get" ; import set from "lodash/set" ; import validate from "./validate" ; import { FormContext } from "./form" ; import { RuleFns } from "./rules" ; export type FieldProps = { name : string ; rules ? : RuleFns ; } ; export const useField = ( { name , rules : fieldRules } ) => { const { errors , values , setErrors , hasBlurred , updateValue , valuesBlurred , rules , } = React . useContext ( FormContext ) ; useEffect ( ( ) => { if ( Array . isArray ( fieldRules ) ) { rules . current [ name ] = fieldRules ; } else { rules . current [ name ] = fieldRules ? [ fieldRules ] : [ ] ; } return ( ) => { rules . current [ name ] = [ ] ; } ; } , [ fieldRules ] ) ; let value = get ( values , name ) ; let fieldErrors = errors . filter ( ( error ) => error . name === name ) . map ( ( error ) => error . message ) ; let validationProps = { values , rules , valuesBlurred , setErrors , errors , } ; const handleChange = ( value , field ? ) => { if ( fieldErrors . length || valuesBlurred [ field || name ] ) { let newValues = { ... values } ; set ( newValues , field || name , value ) ; validate ( { ... validationProps , values : newValues , valuesBlurred : { ... valuesBlurred , [ field || name ] : true } , } ) ; } updateValue ( field || name , value ) ; } ; const handleBlur = ( ) => { hasBlurred ( name ) ; validate ( { ... validationProps , valuesBlurred : { ... valuesBlurred , [ name ] : true } , } ) ; } ; return { handleBlur , handleChange , value , values , errors : fieldErrors . length ? fieldErrors : null , } ; } ;