Скачать или смотреть How to Dynamically Append New Components in React with a Button Click

Learn how to seamlessly add new React components to your application using state management and event handling. Perfect for beginners who are just getting started with React!
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How to Dynamically Append New Components in React with a Button Click

When you start building applications in React, one common requirement might be to add new components dynamically based on user interactions, such as button clicks. If you're used to manipulating the DOM directly using JavaScript, this can be a bit confusing when you switch to the declarative approach of React.

In this post, we will explore how you can replace the traditional method of using innerHTML to append HTML elements with a more React-friendly solution using state management.

The Challenge

Suppose you have a button in your React app, and you want to add a new component, MyComponent, whenever that button is clicked. In plain JavaScript, you might do this with:

[[See Video to Reveal this Text or Code Snippet]]

However, React manages the DOM differently. Here is a simplified version of what a new React developer might attempt:

[[See Video to Reveal this Text or Code Snippet]]

This won't work as expected because React needs to control the UI rendering through states instead.

The Solution: Using State Management in React

To achieve the desired functionality, we need to utilize React's state management. Here's how you can do it:

Step 1: Create a React Component with State

We will modify our App.js to use a class component. Using state, we will keep track of the list of added components.

Here’s the updated App.js:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Create the MyComponent

Now, we need the MyComponent to display the passed properties. Here’s how you can structure MyComponent.js:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

State Management: The myComponentList array in the state holds the data for each component we want to dynamically add.

Event Handling: The my_func function is triggered when the button is clicked, prompting the user for input and updating the state with the new component’s data.

Rendering: In the render method, we map over the myComponentList to render each instance of MyComponent dynamically, passing the new data as props.

Conclusion

By following the steps outlined in this guide, you should now be able to dynamically append new components in your React application using a button click. This method takes full advantage of React's capabilities, ensuring a smooth and efficient user experience while maintaining clear separation between state and UI rendering.

Now, go ahead and experiment with your own components, and enjoy the power and flexibility that React offers!