Kursinnehåll

React Mastery

1. Fundamentals of React and Component-Based UI

What Is React and Why Use It?Comparing SPAs and MPAs in Web Development How React Works with the Virtual DOM Introducing JSX for Writing HTML in JavaScript Building Complex UI with JSX Rendering Elements in React Challenge: Render an Element in React Understanding React Components Passing Data with Props in React Challenge: Create Functional Components Conditional Rendering in React Challenge: Implement Conditional Rendering – Chat Notification Challenge: Implement Conditional Rendering – Bank Alert Rendering Collections of Data in React Challenge: Display Data Collections in React React Fundamentals Wrap-Up

2. Styling Techniques in React Applications

Introduction to Styling in React Using Inline Styles in React Applying Inline Styles in Practice Challenge: Use Inline Styles in a React Component Styling React Components with External CSS Applying External CSS in Practice Challenge: Apply External CSS to a React App Using CSS Modules for Scoped Styling in React Organizing File and Folder Structures for Styles Challenge: Use CSS Modules in React Styling Techniques in React Wrap-Up

3. React Hooks and Context for State Management

Introduction to React Hooks and Context Managing State with the useState Hook Challenge: Toggle Visibility with useState Working with References Using the useRef Hook Challenge: Build a Controlled Form Component Handling Side Effects with the useEffect Hook Challenge: Fetch and Display Data with useEffect Optimizing Performance with the useMemo Hook Challenge: Implement a Car List Filter with useMemo Sharing State Across Components with Context Using Context in a Real-World Scenario Challenge: Build a World of Astronomy App with Context React Hooks and Context Wrap-Up

4. Structuring Real-World React Projects

Setting Up Your React Development Environment Choosing a Code Editor for React Development Organizing the Project Folder Structure Working with the Terminal in React Development Starting and Running a React Project with Vite React Project Setup Wrap-Up

Applying Inline Styles in Practice

Let's create a versatile Notification component that displays text and dynamically changes the background-color property based on the behavior prop. We will proceed with the implementation step-by-step.

Step 1

We begin by creating the parent component, App, along with the child component, Notification, using the basic structure of React.

jsx

Step 2

To provide default styling for the Notification component, we create an object called notificationStyles and assign the following properties: padding with the value of "20px"; fontSize with the value of "24px"; color with the value of "aquamarine";

js

Let's assign the notificationStyles object as the value to the style attribute of the Notification component, which is applied to the returned p element.

jsx

Step 3

In the App component, we can utilize the Notification component by passing the behavior prop and the text prop. The behavior prop determines the appearance of the notification, while the text prop specifies the text to be displayed within the notification.

jsx

Step 4

We can implement the logic to colorize the background of each notification message based on the behavior prop in the following way:

If the value of behavior is "positive", the background color should be set to green;
If the value of behavior is "negative", the background color should be set to red;
If the value of behavior is "neutral", the background color should be set to blue.

We can create a function to handle the logic using the JavaScript switch statement. Here's an example of how it can be implemented:

js

This function takes the behavior prop as an argument and returns the corresponding background color based on the value using the switch statement. The behavior prop will return a transparent background color if it does not match the specified cases.

Let's incorporate this function into the style object of the component:

jsx

We utilize JavaScript conventions to ensure the proper structure of the style object. First, we spread the existing notificationStyles object. Then, we introduce an additional property, backgroundColor, whose value is derived from the string returned by the setBackgroundColor function.

Full app code:

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Avsnitt 2. Kapitel 3

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