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import React from 'react';
import { useForm } from 'react-hook-form';
let renderCounter = 0;
const ConditionalField: React.FC = () => {
const {
register,
handleSubmit,
watch,
formState: {
dirtyFields,
isSubmitted,
submitCount,
touchedFields,
isDirty,
isSubmitting,
isSubmitSuccessful,
isValid,
errors,
},
} = useForm<{
selectNumber: string;
firstName: string;
lastName: string;
min: string;
max: string;
notRequired: string;
}>({
mode: 'onChange',
});
const [result, setResult] = React.useState({});
const selectNumber = watch('selectNumber');
renderCounter++;
return (
<form
onSubmit={handleSubmit((data) => {
setResult(data);
})}
>
<select {...register('selectNumber', { required: true })}>
<option value="">Select</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
{selectNumber === '1' && (
<>
<input
{...register('firstName', { required: true })}
placeholder="firstName"
/>
<input
{...register('lastName', { required: true })}
placeholder="lastName"
/>
</>
)}
{selectNumber === '2' && (
<>
<input
type="number"
{...register('min', { required: true, min: 10 })}
placeholder="min"
/>
<input
type="number"
{...register('max', { required: true, max: 20 })}
placeholder="max"
/>
</>
)}
{selectNumber === '3' && (
<>
<input {...register('notRequired')} placeholder="notRequired" />
</>
)}
<button id="submit">Submit</button>
<div id="state">
{JSON.stringify({
isSubmitted,
submitCount,
isDirty,
isSubmitting,
isSubmitSuccessful,
isValid,
touched: Object.keys(touchedFields),
dirty: Object.keys(dirtyFields),
})}
</div>
<div id="result">{JSON.stringify(result)}</div>
<div id="result">{typeof selectNumber}</div>
<div id="renderCount">{renderCounter}</div>
</form>
);
};
export default ConditionalField;
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