Book Image

Learn React with TypeScript 3

By : Carl Rippon
Book Image

Learn React with TypeScript 3

By: Carl Rippon

Overview of this book

React today is one of the most preferred choices for frontend development. Using React with TypeScript enhances development experience and offers a powerful combination to develop high performing web apps. In this book, you’ll learn how to create well structured and reusable react components that are easy to read and maintain by leveraging modern web development techniques. We will start with learning core TypeScript programming concepts before moving on to building reusable React components. You'll learn how to ensure all your components are type-safe by leveraging TypeScript's capabilities, including the latest on Project references, Tuples in rest parameters, and much more. You'll then be introduced to core features of React such as React Router, managing state with Redux and applying logic in lifecycle methods. Further on, you'll discover the latest features of React such as hooks and suspense which will enable you to create powerful function-based components. You'll get to grips with GraphQL web API using Apollo client to make your app more interactive. Finally, you'll learn how to write robust unit tests for React components using Jest. By the end of the book, you'll be well versed with all you need to develop fully featured web apps with React and TypeScript.
Table of Contents (14 chapters)

Validating forms

Including validation on a form improves the user experience, by giving them immediate feedback on whether the information entered is valid. In this section, we are going to add validation to our Form component and then consume it in our ContactUs component.

The validation rules we are going to implement in the ContactUs component are these:

  • The name and email fields should be populated
  • The name field should be at least two characters

We are going to execute validation rules when the field editor loses focus.

In the next section, we'll add a prop to the Form component that allows consumers to specify validation rules.

Adding a validation rules prop to form

Let's think about how we would want to...