Book Image

ASP.NET Core 3 and React

By : Carl Rippon
Book Image

ASP.NET Core 3 and React

By: Carl Rippon

Overview of this book

Microsoft's ASP.NET Core is a robust and high-performing cross-platform web API framework, and Facebook's React uses declarative JavaScript to drive a rich, interactive user experience on the client-side web. Together, they can be used to build full stack apps with enhanced security and scalability at each layer. This book will start by taking you through React and TypeScript components to build an intuitive single-page application. You’ll understand how to design scalable REST APIs that can integrate with a React-based frontend. You’ll get to grips with the latest features, popular patterns, and tools available in the React ecosystem, including function-based components, React Router, and Redux. The book shows how you can use TypeScript along with React to make the frontend robust and maintainable. You’ll then cover important .NET Core features such as API controllers, attribute routing, and model binding to help you build a sturdy backend. Additionally, you’ll explore API security with ASP.NET Core identity and authorization policies, and write reliable unit tests using both .NET Core and React before you deploy your app to the Azure cloud. By the end of the book, you’ll have gained all the knowledge you need to enhance your C# and JavaScript skills and build full stack, production-ready applications with ASP.NET Core and React.
Table of Contents (22 chapters)
Free Chapter
1
Section 1: Getting Started
4
Section 2: Building a Frontend with React and TypeScript
9
Section 3: Building an ASP.NET Core Backend
16
Section 4: Moving into Production
20
Assessments

Stopping a data state being set if the user navigates away from the page

There is a slight problem in the page components at the moment when they request data and set this in the state. The problem is if the user navigates away from the page while the data is still being fetched, the state will attempt to be set on a component that no longer exists. We are going to resolve this issue on the HomePage, QuestionPage, and SearchPage components by carrying out the following steps:

  1. In HomePage.tsx, let's change the useEffect call to the following:
 useEffect(() => {
let cancelled = false;
const doGetUnansweredQuestions = async () => {
const unansweredQuestions = await getUnansweredQuestions();
if (!cancelled) {
setQuestions(unansweredQuestions);
setQuestionsLoading(false);
}
};
doGetUnansweredQuestions();
return () => {
cancelled = true;
};
}, []);

We use a cancelled...