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import React from 'react';
import { useForm, Control, useWatch, Controller } from 'react-hook-form';
import { useRef } from 'react';
type FormInputs = {
test: string;
test1: string;
test2: string;
};
let counter = 0;
const GrandChild = ({
control,
index = 0,
}: {
control: Control<FormInputs>;
index?: number;
}) => {
const counter1 = useRef(0);
const output = useWatch({
name: 'test',
control,
});
counter1.current++;
return (
<div style={{ border: '2px solid blue', padding: 10, margin: 5 }}>
<h2 style={{ margin: 0 }}>Grandchild 0:</h2>
<p id={`grandchild0${index}`}>{output}</p>
<p id="grandChildCounter">Render counter: {counter1.current}</p>
</div>
);
};
const GrandChild1 = ({ control }: { control: Control<FormInputs> }) => {
const counter = useRef(0);
const output = useWatch<FormInputs>({
name: ['test', 'test1'],
control,
});
counter.current++;
return (
<div style={{ border: '2px solid blue', padding: 10, margin: 5 }}>
<h2 style={{ margin: 0 }}>Grandchild 1:</h2>
<p id="grandchild1">
{output[0]}
{output[1]}
</p>
<p id="grandChild1Counter">Render counter: {counter.current}</p>
</div>
);
};
const GrandChild2 = ({
control,
}: {
control: Control<{
test: string;
test1: string;
test2: string;
}>;
}) => {
const counter = useRef(0);
const output = useWatch<{
test: string;
test1: string;
test2: string;
}>({
control,
});
counter.current++;
return (
<div style={{ border: '2px solid blue', padding: 10, margin: 5 }}>
<h2 style={{ margin: 0 }}>Grandchild 2:</h2>
<p id="grandchild2">
{output.test}
{output.test1}
{output.test2}
</p>
<p id="grandChild2Counter">Render counter: {counter.current}</p>
</div>
);
};
const Child = ({ control }: { control: Control<FormInputs> }) => {
const counter1 = useRef(0);
counter1.current++;
return (
<div style={{ border: '2px solid green', padding: 10, margin: 5 }}>
<h2 style={{ margin: 0 }}>Child:</h2>
<GrandChild index={1} control={control} />
<p id="childCounter" style={{ color: 'red' }}>
<b>Render counter: {counter1.current} π</b>
</p>
</div>
);
};
export default () => {
const { register, control } = useForm<FormInputs>();
counter++;
return (
<div style={{ border: '2px solid red', padding: 10, margin: 5 }}>
<h2 style={{ margin: 0 }}>Parent:</h2>
<input
{...register('test')}
autoComplete="off"
placeholder="π watching me :)"
style={{ fontSize: 20 }}
/>
<Controller
name="test1"
control={control}
render={({ field }) => (
<input
placeholder="π watching me :)"
autoComplete="off"
style={{ fontSize: 20 }}
{...field}
/>
)}
defaultValue=""
/>
<input
{...register('test2')}
name="test2"
autoComplete="off"
placeholder="π watching me :)"
style={{ fontSize: 20 }}
/>
<GrandChild control={control} />
<Child control={control} />
<GrandChild1 control={control} />
<GrandChild2 control={control} />
<p id="parentCounter" style={{ color: 'red' }}>
<b>Render counter: {counter} π</b>
</p>
</div>
);
};
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