Скачать или смотреть React Hook Form Unpacked: Ditching the Rerender Trap for Faster

The e-book "Web Forms with React: Build Robust and Scalable Forms with React Hook Form" is part of the Apress Pocket Guides series, which offers concise summaries of cutting-edge technologies, best practices, and core concepts for experts and newcomers.

The central topic is the development of robust and scalable web forms in React using the React Hook Form library.

Forms are an integral part of all software and the source of most data on the web. It is therefore crucial to handle, scale, and validate forms correctly.
Chapter 1 discusses the disadvantages of the traditional approach to form management in React, which is often chosen by inexperienced developers:

Native state management (e.g., with useState) can result in catastrophic performance degradation.

There is no native standard for validation. Complex validation scenarios (e.g., validation only when a field is visited and then upon each change) require additional states and conditions, increasing the risk of errors.
The lack of a clear standard results in each team member using different strategies for forms, making future maintenance and troubleshooting difficult.
Homegrown, non-standardized forms scale poorly and are often not easily converted into reusable components, which contradicts the core philosophy of React.
Non-standardized methods lead to error-prone applications.
The solution to these problems is to use a library used by millions of developers, such as React Hook Form, which offers a standard, robustness, scalability/reusability, and a developer-friendly API.
React Hook Form (RHF) is presented as a powerful and robust alternative to other libraries such as Formik and Redux Form.
RHF uses refs to manage form values, which prevents renders from being triggered on input, making the library faster than state-based alternatives. RHF also offers dev tools for monitoring form state and a form builder on its website for generating boilerplate code. The library is available cross-platform (web and React Native).
The heart of React Hook Form is the useForm hook.
useForm returns useful functions and objects:
register: The core function that expects a unique string key for each input field. It returns the props onChange, onBlur, name, and, most importantly, ref. The ref value is key to performance, as RHF performs data management via refs rather than states. The function optionally accepts native validation rules.
handleSubmit: A wrapper that calls the custom onSubmit function only (synchronously or asynchronously) when all validations have passed.
watch: Used to monitor changes to specific fields. Using watch causes the entire form to be rendered whenever the value changes.
formState: An object containing information about the current state of the form (e.g., errors, isLoading, isValid, isDirty), useful for UI logic such as displaying loading states or disabling the submit button.
reset: Resets the entire form state to the originally defined defaultValues.
TypeScript Usage: RHF natively supports TypeScript. By passing a type to useForm as a generic, end-to-end type safety, auto-completion, and error checking are ensured.
Chapter 4 demonstrates the practical creation of forms.
Because RHF uses uncontrolled components (Refs), the Controller component must be used to integrate controlled components from third-party libraries (such as Material UI).
#react #rhf #webforms