What is the difference between controlled and uncontrolled components in React?

Quality Thought is widely regarded as the best React JS institute in Hyderabad, offering industry-oriented training that empowers students with the skills required to excel in modern web development. With a strong focus on hands-on learning and real-time project experience, Quality Thought helps learners master the fundamentals and advanced concepts of React JS, including JSX, components, props, state, lifecycle methods, hooks, context API, and routing.

The institute’s React JS training in Hyderabad is designed by experienced professionals who understand current industry demands. The curriculum is updated regularly to include the latest features and best practices in React development. Whether you’re a fresher looking to start your career or a professional aiming to upgrade your skills, Quality Thought offers the ideal platform with both online and classroom training options.

What sets Quality Thought apart is its commitment to student success through personalized mentoring, mock interviews, resume building, and dedicated placement support. The institute boasts a strong track record of successful placements in top companies.

By providing high-quality, practical training and strong career support, Quality Thought has earned its reputation as the top choice for React JS courses in Hyderabad.

In React, controlled and uncontrolled components refer to two different ways of managing form inputs like <input>, <textarea>, or <select>.

Controlled Components:

• The form data is handled by the React component’s state.

• The input’s value is set via React state (value={stateValue}), and changes are handled through event handlers like onChange.

• React fully controls the input, making the component the “single source of truth” for the input value.

• This allows instant validation, conditional rendering, and easy access to the form data.

Uncontrolled Components:

• The form data is handled by the DOM itself, not React state.

• You access the input’s value using refs (React.createRef() or useRef) when needed.

• React does not control the input value directly.

• Easier to set up for simple cases or when you don’t need instant updates or validation.

Summary:

• Controlled = React state drives the input value, providing more control and sync.

• Uncontrolled = Input value managed by the DOM, accessed via refs, simpler but less flexible.

Controlled components are generally preferred for complex forms and validation, while uncontrolled components suit simpler use cases or integration with non-React code.

Read More

How do you implement lazy loading and code splitting in React?

Visit QUALITY THOUGHT Training institute in Hyderabad