Gain insights into creating robust React forms with Formik. Delve into managing form states, validation with Yup, and handling submissions to build scalable, efficient forms.

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This course focuses on Formik, a JavaScript library for building forms in React. The ability to handle form data is crucial in modern web development, and Formik simplifies the process by allowing you to create forms with less code. You'll learn how to leverage Formik to create complex and straightforward forms with ease.

You'll start with the basics of Formik and gradually work your way up to more advanced topics. You'll learn how to create form fields, handle validation, manage form states, and submit forms. You'll also learn how to use Formik with other popular libraries like Yup for more advanced validation scenarios. 

By the end of this course, you'll be able to create robust and scalable forms in React using Formik. You'll have a deep understanding of how to manage form states, handle form submissions, and validate user input. Data collection is a key element in information technology and will enable you to build better, more organized forms with less code.

Writing React Forms Like a Pro with Formik

It's important that for all the forms in our application, the styles and the way we notify users of errors need to be consistent. One way to do this is to copy the entire form code and paste it into the different pages where we need a form. But this is bad practice because whenever we want to change anything in the form, we'll need to change it in multiple places. Besides, it's always a bad idea to repeat ourselves, especially when we can avoid it. What we want to do instead is to build a set of reusable form components that we can apply across different forms in an app. 

To get started, we'll create a FormikWrapper component. This is what will house our Formik context provider. This makes it possible for us to add other reusable components to our form, with each of them having access to the form's state wherever they are used.

# The `FormikWrapper` component
The `FormikWrapper` component is where we'll initialize Formik's state using the `Formik` component. The `Formik` component houses the context provider and it accepts some props that initialize Formik's state, including `initialValues`, `validationSchema`, and `onSubmit`.

Usually, in an app, there are multiple forms, such as the login form, the registration form, the forgot password form, and so on. If we create the `initialValues`, `validationSchema`, and `onSubmit` variables in the `FormikWrapper` component, it means that we can only use the component in one form because these different forms have different values for these variables.

The best way to go about this is to allow our `FormikWrapper` component to accept these values as props. This way, in the different forms in which we use the `FormikWrapper` component, we can pass in these values—`initialValues`, `validationSchema`, `onSubmit`, and other necessary values—as props to the component.

First, we'll create a `pages` folder to place the pages of our app and a `components` folder to place the reusable components. In the `pages` folder, we'll create a `register` folder for the registration page that we'll be working on. Inside the `register` folder, we'll create two files—`index.js` for our JavaScript code and `style.css` for our CSS styles.

Inside the `components` folder, we'll create a `FormikWrapper` folder and an `index.js` file inside it. This is where we'll write our code for the `FormikWrapper` component.

Now that the structure of our folder is ready, let's write some code.

Learn how to create a reusable wrapper component for a form in React.

Getting Started

Managing the Form State

Validating Forms

Submitting Forms

Assessment: Formik Essentials — From Managing State to Submission

Reducing Boilerplate

Creating Reusable Form Components

Additional Concepts

Final Assessment

Project: Build a Multi-Step Checkout Form with React and Formik

The FormikWrapper Component