ReactJS
Controlled vs. Uncontrolled Components in React: When to Use Each
Introduction
The two types of components describing form input processing in React.js are the Controlled and Uncontrolled Components. They are briefly described below.
Controlled Components
- Definition: Controlled Components are those where the state of a React component controls the form data.
- How it works: The component uses the useState hook (or other state management techniques) to monitor and update the inputs' values.
import { useState } from "react";const ControlledInput = () => { const [inputValue, setInputValue] = useState(""); return ( <input type="text" value={inputValue} onChange={(e) => setInputValue(e.target.value)} /> );};
Uncontrolled Components
- Definition: The form data is managed by the DOM itself, not React state.
- How it works: You call useRef to access the input's value whenever you need to
import { useRef } from "react";const UncontrolledInput = () => { const inputRef = useRef(); const handleSubmit = () => { alert(`Input Value: ${inputRef.current.value}`); }; return ( <> <input type="text" ref={inputRef} /> <button onClick={handleSubmit}>Submit</button> </> );};
When to Use Which?
- Use Controlled Components to handle dynamic fields and validation and advanced forms.
- Use Uncontrolled Components for simple forms or where only performance is the issue.
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