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

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React-with-watcher

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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

When we want our user to select a date, we make use of the `date` input field. Clicking this field displays a date picker, which has an appearance that depends on the browser and the operating system of the device. To have more control over the style of the date picker, we can use a JavaScript date picker library, one of which we'll use later in this lesson. But for now, let's see how to create a `DateInput` component with the default `date` input element.

We'll write the code for our `DateInput` component in the `components/DateInput/index.js` file. 

* {
  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

Creating a `date` input field follows the same process as creating a text input field. The difference here is that the `type` prop we pass to the `Field` component takes the value, `"date"`. We then update the `FormikControl` component in `components/FormikControl/index.js` to return the `DateInput` component when the `control` prop is `"date"`. Finally, we add the field for `dateOfBirth` to the register page, `pages/register/index.js`.

If we want, we can specify the earliest and latest possible date that can be selected. This can be done using the `min` (earliest date to accept) and `max` (latest date to accept) attributes. The values for both attributes must be valid date string formats, such as `yyyy-mm-dd`.

Here is an example:


Learn how to create a reusable date picker component with React, Formik, and the react-datepicker library.

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 DateInput Component