React-hook-form + dynamic form: Render element upon dropdown selection - forms

Question

I am working in form using react-hook-form. This form use useFieldArray, it has to be dynamic.
Right now is very simple, it contains a react-select component with a few options and a textfield that get rendered depending on the option that the user select on the select component.
The problem I have is that the textfield component renders when the state updates, which is correct until I add a new group of element to the form. Since the textfield is listening to the same state it doesn't matter which select I use to render the textfield element, it gets rendered in all groups.
I am looking a way to specify which textfield should be rendered when the user change the select.
I the sandbox you can see what I have done. To reproduce the problem click on the "Add"-button and you will see two areas, each one with a select component.
When you choose "Other" in the select component a textfield appears, but not only in the area where the select was changed but in all areas.
How can I avoid that behavior?
https://codesandbox.io/s/vibrant-fast-381q0?file=/src/App.tsx
Extract:
const [isDisabled, setIsDisabled] = useState<boolean>(true);
const { control, handleSubmit, getValues } = useForm<IFormFields>({
defaultValues: {
managerialPositions: [
{
authority: 0,
chiefCategory: 0,
title: 0,
otherTitle: ""
}
]
}
});
useFieldArray implementation:
const {
fields: managerialPositionsFields,
append: managerialPositionsAppend,
remove: managerialPositionsRemove
} = useFieldArray({
name: "managerialPositions",
control
});
Here i update the state when the user select "Other title" in the select component:
const watchChange = (value?: number, i?: number) => {
let values: any = getValues();
if (values.managerialPositions[i].title === 3) {
setIsDisabled(false);
}
};
And here is where I render the button to create a new group of elements and the select component and the textfield that should be rendered if "isDisabled" is false.
{managerialPositionsFields.map((field, index) => {
return (
<Stack className="sectionContainer" key={field.id}>
<Stack horizontal horizontalAlign="space-between">
<StackItem>
<CommandBarButton
iconProps={{ iconName: "AddTo" }}
text="Add"
type="button"
onClick={() => {
managerialPositionsAppend({
authority: 0,
chiefCategory: 0,
title: 0,
otherTitle: ""
});
}}
/>
</StackItem>
</Stack>
<Stack horizontal tokens={{ childrenGap: 20 }}>
<StackItem>
<Label className="select-label requiredIkon">Title</Label>
<Controller
control={control}
name={`managerialPositions.${index}.title`}
render={({ field: { onChange, value, ref } }) => (
<>
<Select
className="react-select-container authoritySelect"
classNamePrefix="react-select"
placeholder="Select title"
options={titelList}
id={`managerialPositions.${index}.title`}
value={
titelList.find((g) => g.value === value)
? titelList.find((g) => g.value === value)
: null
}
onChange={(val) => {
onChange(val.value);
watchChange(val.value, index);
}}
/>
{
// this input is for select validation
<input
tabIndex={-1}
autoComplete="off"
style={{ opacity: 0, height: 0 }}
value={
titelList.find((g) => g.value === value)
? titelList
.find((g) => g.value === value)
.toString()
: ""
}
required={true}
//Without this console will get an error:
onChange={() => {}}
/>
}
</>
)}
/>
</StackItem>
{!isDisabled && (
<StackItem className="">
<Controller
name={`managerialPositions.${index}.otherTitle`}
control={control}
render={({
field: { onChange, name: fieldName, value }
}) => (
<TextField
label="Other title"
name={fieldName}
onChange={(e) => {
onChange(e);
}}
value={value}
/>
)}
/>
</StackItem>
)}
</Stack>
</Stack>
);
})}