How to create a controlled component in React?

by mallory_cormier , in category: Javascript , 7 months ago

How to create a controlled component in React?

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1 answer

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by brandy , 7 months ago

@mallory_cormier 

To create a controlled component in React, you will need to follow these steps:

  1. Initialize state in the parent component: Start by initializing a state variable that will track the value of the controlled component. This could be done using the useState hook or by setting the initial state in the component's constructor. const [value, setValue] = useState('');
  2. Set the value prop of the controlled component: Next, assign the state variable as the value prop of the controlled component. This will ensure that the component displays the value from the state. setValue(event.target.value)} />
  3. Handle onChange event: Add an onChange event handler to the controlled component. This event handler will capture any changes made to the component and update the state variable accordingly. const handleChange = (event) => { setValue(event.target.value); }; The event.target.value is the new value entered by the user.
  4. Submit or process the value: Since the controlled component's value is stored in the state variable, you can access it whenever needed. For example, you can submit the value to a server or use it to update other components. const handleSubmit = () => { // Do something with the value, e.g., send it to a server console.log(value); }; You can use the value variable anywhere within the parent component to access the current value of the controlled component.


By following these steps, you have created a controlled component in React that is driven by the state variable.