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Try useOptimistic with useFormState and progressive enhancement #38

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Try useOptimistic with useFormState and progressive enhancement #38

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a493ac1
Try `useOptimistic`
unstubbable Jan 12, 2024
9eac3b5
Fix progressive enhancement
unstubbable Jan 12, 2024
4f9c36e
Use non-hook form of `startTransition`
unstubbable Jan 12, 2024
322eeec
Do not submit action in `onSubmit`
unstubbable Jan 12, 2024
83ff7f4
Well, parentheses are useful sometimes
unstubbable Jan 12, 2024
1300e0e
Move optimistic state logic from dispatch callback back to reducer
unstubbable Jan 12, 2024
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23 changes: 21 additions & 2 deletions apps/shared-app/src/client/product.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -15,10 +15,29 @@ export interface ProductProps {
}

export function Product({buy}: ProductProps): JSX.Element {
const [result, formAction] = ReactDOM.useFormState(buy, undefined);
const [formState, formAction] = ReactDOM.useFormState(buy, undefined);

const [result, setOptimisticResult] = React.useOptimistic<
BuyResult | undefined,
number
>(formState, (prevResult, quantity) => ({
status: `success`,
quantity,
totalQuantityInSession:
(prevResult?.totalQuantityInSession ?? 0) + quantity,
}));

return (
<form action={formAction}>
<form
action={formAction}
onSubmit={(event) => {
const formData = new FormData(event.currentTarget);

React.startTransition(() => {
setOptimisticResult(parseInt(formData.get(`quantity`) as string, 10));
});
}}
>
<p className="my-2">
This is a client component that renders a form with a form action. On
submit, a server action is called with the current form data, which in
Expand Down