Building Web Applications with React and ASP.NET Core/

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Understanding Controlled Components

Understanding Controlled Components

Learn to implement forms using controlled components.

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In this section, we are going to learn how to use what are called controlled components to implement a form. A controlled component has its value synchronized with the state in React. This will make more sense when we’ve implemented our first controlled component.

Changing our app header to a controlled component

Let’s open our project in Visual Studio Code and change the search box in our app header to a controlled component. Follow these steps:

  1. Open Header.tsx and add the following imports:

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import { 
  Link,
  useSearchParams,
} from 'react-router-dom';

  1. The default value for the search box is going to be the criteria route query parameter. So, let’s use the useSearchParams hook from React Router to get this: ...