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Controlled Forms in React. Form input values can be set to state values and then updated via React events. Defining a form's input value via state is considered a controlled component. For controlled inputs you will need a corresponding state and then a class method to update that state with changes.
A controlled input accepts its current value as a prop, as well as a callback to change that value. You could say it's a more React way of approaching this (which doesn't mean you should always use it). It takes in the new value of the input and sets it in the state.
A Controlled Component is one that takes its current value through props and notifies changes through callbacks like change. A parent component “controls” it buy handling the callback and managing its own state and passing the new values as props to the controlled component.
Uncontrolled Components. In most cases, we recommend using controlled components to implement forms. In a controlled component, form data is handled by a React component. The alternative is uncontrolled components, where form data is handled by the DOM itself.
An Uncontrolled Component is one that stores and maintains its own state internally. A ref is used to find its current value when you need it. React doesn't recommend this pattern, but it's useful when developers only care about the final state rather than the intermediate state of the component.
Redux-form is a perfect library for working with simple forms and validations. It looks like Redux-form was created just for validation. Unfortunately, life is not so easy. When you have complex forms, they will become too complicated, and you will have trouble with performance.
Redux is a predictable state container for JavaScript applications. It helps you write applications that behave consistently, run in different environments (client, server, and native), and are easy to test. Simply put, Redux is a state management tool.
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