Controlled And Uncontrolled Components in React смотреть онлайн

Controlled And Uncontrolled Components in React

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Welcome to this video from tutorialsinhand.com. In this video we are going to discuss on controlled and uncontrolled components in react

Controlled Components in React
In React, controlled components are those in which data is handled by the component’s state and not directly by the DOM using “refs”. Using props the component initializes its current state and by using event handlers it updates the states and thus re-renders the DOM.


Uncontrolled Components in React
This is very similar to the general HTML inputs that we are familiar with. These component are not controlled by the React state but handled directly by the DOM. So, to access any data here, we need to take help of “refs”.

The ref is used to return a reference to the element. ”useRef()” is a React Hook that lets you reference a value that’s not needed for rendering. It takes an initial value as arguments and is mutable. It contains the “current” object which is set to the initial value. Later, we can set it to something else.


In class components we use “refs” using the “createRef()” method and in functional components, we use the “useRef()” hook.




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