Скачать или смотреть Controlled Component in React

A controlled component in React is a form element (like input, textarea, or select) whose value is controlled by React state.

How It Works

React holds the current value of the input in its state (using useState or similar).

The input’s value is always set to that state variable.

Whenever the user types or changes the value, an onChange handler updates the state.

This keeps the UI and state perfectly in sync — React is the "single source of truth."

Why Use Controlled Components

Centralized Data – All form data is stored in React state.

Real-Time Validation – Validate input as the user types.

Dynamic Behavior – Easily enable/disable fields based on conditions.

Predictable State – Easier to debug and test because state is always accurate.

Better Control – Perfect for complex forms, search bars, filters, etc.

When to Use

You need to track user input live (e.g., showing character count).

You need form validation while typing.

You want to save form data before submission.

You need controlled behavior (like disabling the button until all fields are filled).

When Not to Use

When performance is critical, and you don’t need React to update on every keystroke.

When the form is very large, and state updates could slow things down (then you might prefer uncontrolled components or libraries like React Hook Form).

Summary

Controlled components make your form fully managed by React, giving you more control, better validation, and cleaner logic — but they can be slightly more verbose since you need to manage state manually.

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