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Building Web Applications with React and ASP.NET Core

Understanding Controlled Components

Explore how controlled components work in React by learning to synchronize input values with component state. Understand how to implement change handlers to update state, making form inputs interactive. This lesson guides you through converting an input into a controlled component and managing form submission events for better user input handling.

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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:

Node.js
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: ...