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import React from 'react';
import { useForm, ValidationMode } from 'react-hook-form';
import { useParams } from 'react-router-dom';
let renderCounter = 0;
const FormStateWithNestedFields = () => {
const { mode } = useParams();
const {
register,
handleSubmit,
formState: {
dirtyFields,
isSubmitted,
submitCount,
touchedFields,
isDirty,
isSubmitting,
isSubmitSuccessful,
isValid,
},
reset,
} = useForm<{
left: {
test1: string;
test2: string;
};
right: {
test1: string;
test2: string;
};
}>({
mode: mode as keyof ValidationMode,
defaultValues: {
left: {
test1: '',
test2: '',
},
right: {
test1: '',
test2: '',
},
},
});
renderCounter++;
return (
<form onSubmit={handleSubmit(() => {})}>
<div style={{ display: 'flex' }}>
<div style={{ display: 'flex', flexDirection: 'column' }}>
<h4>Left</h4>
<input
{...register('left.test1', { required: true })}
placeholder="firstName"
/>
<input
{...register('left.test2', { required: true })}
placeholder="lastName"
/>
</div>
<div style={{ display: 'flex', flexDirection: 'column' }}>
<h4>Right</h4>
<input
{...register('right.test1', { required: false })}
placeholder="firstName"
/>
<input
{...register('right.test2', { required: false })}
placeholder="lastName"
/>
</div>
</div>
<div id="state">
{JSON.stringify({
isDirty,
isSubmitted,
submitCount,
isSubmitting,
isSubmitSuccessful,
isValid,
touched: (
Object.keys(touchedFields) as Array<keyof typeof touchedFields>
).flatMap((topLevelKey) =>
Object.keys(touchedFields[topLevelKey] || {}).map(
(nestedKey) => `${topLevelKey}.${nestedKey}`,
),
),
dirty: (
Object.keys(dirtyFields) as Array<keyof typeof touchedFields>
).flatMap((topLevelKey) =>
Object.keys(dirtyFields[topLevelKey] || {}).map(
(nestedKey) => `${topLevelKey}.${nestedKey}`,
),
),
})}
</div>
<button id="submit">Submit</button>
<button type="button" onClick={() => reset()} id="resetForm">
Reset
</button>
<div id="renderCount">{renderCounter}</div>
</form>
);
};
export default FormStateWithNestedFields;
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