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.

Write React Forms Like A Pro With Formik.png

react.tar.gz

React-with-watcher

React-without-watcher

react-app-template

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

When we want our users to select an option from the given options, we use the `RadioGroup` component. But if there are a lot of options to be selected from, the radio group isn't a suitable choice because there will be a lot of radio buttons littered around the interface. In this situation, our best choice is to use the `SelectDropdown` component.



Just like the `date` input field, the appearance of the drop-down that is displayed when a `select` field is clicked is dependent on the browser rendering the page and the operating system of the device. There are libraries that can help us customize the appearance of the drop-down, one of which is the `react-select` library. But before we look into it, let's create a `SelectDropdown` component without a select drop-down library.

* {
  font-family: Helvetica, Cambria, Droid Sans, Helvetica Neue, sans-serif;
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  transition: 0.6s;
}

body {
  background: #f6f8fa;
}


import React from 'react';
import ReactDOM from 'react-dom';
import App from './app.js';
import "./index.css"

ReactDOM.render(
  <App />, 
  document.getElementById('root')
);


import Register from "./pages/register";

const App = () => {
  return (
    <div>
      <Register />
    </div>
  );
}

export default App;


import React from 'react';
import { shallow, configure } from 'enzyme';
import Adapter from 'enzyme-adapter-react-16';

configure({ adapter: new Adapter() });

import HelloWorld from './app';

var TestResult = function() {
    this.succeeded = false;
    this.reason = "";
    this.input = "";
    this.expected_output = "";
    this.actual_output = "";
}

export const executeTests = function() {

  var results = [];

  result = new TestResult();
  result.input = 'HelloWorld Component';
  result.expected_output = "span containing text 'Hello World'"

  let wrapper = shallow(<HelloWorld />);

  // Call your Challenge function here.

  let type = wrapper.type();
  let testSuccessful = true;
  let failureReason;

  if (type !== 'span') {
    testSuccessful = false;
    failureReason = "You need to render exactly one span HTML element";
  } else if (wrapper.props().children != "Hello World") {
     testSuccessful = false;
     failureReason = "You have rendered wrong message in your span element";
  }

  result.actual_output = wrapper.html();

  if (testSuccessful) {
    result.succeeded = true;
    result.reason = "Succeeded"
  } else {
    result.succeeded = false;
    result.reason = failureReason;
  }

  results.push(result);

  return results;
}


React

Dart

GoJS React

Typescript React

Vue.js

We create the `SelectDropdown` component in the `components/SelectDropdown/index.js` file. We make use of the `Field` component and pass an `as` prop with the `"select"` value. As a child to the `Field` component, we map through the `options` array to display the `option` tag. These options are going to be on the drop-down. For each `option`, we specify its value. This means that whenever an option is selected, its value will become the component's value.

Then we update the `FormikControl` component to return the `Select` component when the `control` prop is `"select"`.

Finally, in `pages/register/index.js`, we create a `countryOptions` array and add a `country` field to `initialValues` and `validationSchema`. Then, we update the `FormikControl` component, which has a `control` prop of `"select"` with the `name`, `label`, and `options`.


Learn how to create a reusable SelectDropdown component with React and Formik.


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 SelectDropdown Component