You’ll also learn the advantages and disadvantages of controlled and uncontrolled components. In this tutorial, you’ll build forms using React and handle form submissions with an example app that submits requests to buy apples. The second approach is called a controlled component because React is actively updating the input. The first approach is called an uncontrolled component because React is not setting the value. React forms present a unique challenge because you can either allow the browser to handle most of the form elements and collect data through React change events, or you can use React to fully control the element by setting and updating the input value directly. Instead, you’ll capture the form information on the client-side and send or display it using additional JavaScript code. Since most React applications are single page applications (SPAs), or web applications that load a single page through which new data is displayed dynamically, you won’t submit the information directly from the form to a server. They allow users to directly input and submit data in components ranging from a login screen to a checkout page. Introductionįorms are a crucial component of React web applications. The author selected Creative Commons to receive a donation as part of the Write for DOnations program.
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