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controlled and uncontrolled components in react example

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Abhishek answered on September 10, 2021 Popularity 10/10 Helpfulness 3/10

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controlled and uncontrolled components in react example

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// controlled
- In a controlled component, form data is handled by a React component.

// uncontrolled
- The alternative is uncontrolled components, where form data is handled
by the DOM itself. To write an uncontrolled component, instead of
writing an event handler for every state update, you can use a ref 
to get form values from the DOM.

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Contributed on Sep 10 2021

Abhishek

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controlled and uncontrolled components

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An uncontrolled component is a component that renders form elements, 
where the form element's data is handled by the DOM (default DOM behavior). 
To access the input's DOM node and extract its value you can use a ref.

Example - Uncontrolled component:
const { useRef } from 'react';

function Example () {
  const inputRef = useRef(null);
  return <input type="text" defaultValue="bar" ref={inputRef} />
}

  
In a controlled component, the form element's data is handled by the 
React component (not DOM) and kept in the component's state. 
A controlled component basically overrides the default behavior 
of the HTML form elements.

We create a controlled component by connecting the form element 
(<input>, <textarea> or <select>) to the state by setting its attribute 
value and the event onChange.

Example - Controlled Component:
const { useState } from 'react';

function Controlled () {
  const [email, setEmail] = useState();

  const handleInput = (e) => setEmail(e.target.value);


  return <input type="text" value={email} onChange={handleInput} />;
}

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Source: stackoverflow.com

Tags: javascript j

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Contributed on Feb 07 2022

Excited Earthworm

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A component is changing a controlled input to be uncontrolled.

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import React, { useState } from 'react';

const MyComponent = () => {
  const [inputValue, setInputValue] = useState('');

  const handleInputChange = (e) => {
    setInputValue(e.target.value);
  };

  return (
    <input
      type="text"
      value={inputValue}
      onChange={handleInputChange}
    />
  );
};

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Contributed on Sep 11 2023

YOU.com

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controlled vs uncontrolled components in react js

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// controlled vs uncontrolled components in react js

An uncontrolled component is a component that maintains its own internal state. means where form data is handled
by the DOM itself.
Think of a typical <input type='text' /> element. It appears onscreen as a text box. If you need to know what text is currently in the box, then you can ask the <input />, possibly with some code like this:

let input = document.querySelector('input[type="text"]');
 
let typedText = input.value; // input.value will be equal to whatever text is currently in the text box.
The important thing here is that the <input /> keeps track of its own text. You can ask it what its text is at any time, and it will be able to tell you.

The fact that <input /> keeps track of information makes it an uncontrolled component. It maintains its own internal state, by remembering data about itself.


A controlled component is a component that does not maintain any internal state. means form data is handled by a React component. 
Since a controlled component has no state, it must be controlled by someone else.

A controlled component, on the other hand, has no memory. If you ask it for information about itself, then it will have to get that information through props. Most React components are controlled.

In React, when you give an <input /> a value attribute, then something strange happens: the <input /> BECOMES controlled. It stops using its internal storage. This is a more ‘React’ way of doing things.

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Contributed on Dec 29 2022

Chetan Nada

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uncontrolled component react

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import React, { useRef } from 'react';

function UncontrolledInput() {
  const inputRef = useRef(null);

  const handleSubmit = (e) => {
    e.preventDefault();
    console.log(inputRef.current.value);
  }

  return (
    <form onSubmit={handleSubmit}>
      <input type="text" ref={inputRef} />
      <button type="submit">Submit</button>
    </form>
  );
}

export default UncontrolledInput;

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Contributed on Sep 12 2023

YOU.com

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