Using an empty value attribute on the "placeholder" option allows validation (via the required attribute) to work around having the "placeholder", so if the option isn't changed, but is required, the browser should prompt the user to choose an option from the list., React-Query’s useQuery hook provides several powerful options that can help you build flexible and efficient data-fetching solutions in your React applications. Whether you need to poll an API at a regular interval, fetch data in the background, or transform the data before it’s returned to the component, options like refetchInterval , We make use of Placeholder in forms, to show data related to the entity. For example let's say we have an EditUser page and form. We are using Placeholder as an example while viewing this page, to show some interesting live updating status about some thing based on this user., Placeholder Query Data. Initial Query Data. Prefetching. Mutations. Query Invalidation. Invalidation from Mutations. Updates from Mutation Responses Suspense. Testing. Does this replace [Redux, MobX, etc]? Migrating to React Query 3. Examples. Simple. Basic. Basic w/ GraphQL-Request. Custom Hooks. Auto Refetching / Polling / Realtime , With this API, you can create multiple types of polls (multiple choice, checkbox, ranking, text input, star rating) programmatically using URL-encoded query parameters. The poll is rendered as a publicly accessible web page., What is placeholder data? Placeholder data allows a query to behave as if it already has data, similar to the initialData option, but the data is not persisted to the cache. This comes in handy for si.