Скачать или смотреть Creating a Simple Parallax Effect in React Using useRef and useEffect

Learn how to implement a parallax effect using React's `useRef` and `useEffect`. This guide will guide you through the problem and provide a step-by-step solution to enhance your web design skills.
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This video is based on the question https://stackoverflow.com/q/70339336/ asked by the user 'spotexx' ( https://stackoverflow.com/u/14224180/ ) and on the answer https://stackoverflow.com/a/70339434/ provided by the user 'MD M Nauman' ( https://stackoverflow.com/u/5321854/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Creating a Simple Parallax Effect in React

Parallax scrolling is a visual effect where the background moves at a different speed compared to the foreground as you scroll down the page. This technique can create a sense of depth and make a website more engaging. However, if you're new to React, implementing this effect can be a bit challenging, especially when it comes to updating the background position dynamically as the user scrolls. In this guide, we’ll address how to successfully achieve a parallax effect in React.

The Problem: Fixed Positioning Not Updating

You might have used fixed positioning to set up a simple parallax effect but found that the background image isn't updating as expected while scrolling. Here’s a quick look at the initial code you may have attempted:

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While this may seem like a good start, the background did not adapt to the scrolling behavior, leaving you with a static image that doesn't create the desired visual effect.

The Solution: Using useEffect and useState

To achieve the parallax effect, you need to listen to the scroll event and update the position of the background image accordingly. Here’s a comprehensive breakdown of how to implement this using React's useEffect and useRef.

Step 1: Setting Up State and Reference

First, we need to set up a state variable to store the position of the parallax background. We also retain the reference to the DOM element using useRef.

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Step 2: Listening for Scroll Events

Next, we need to utilize useEffect to listen for scroll events. Inside this effect, we can set up a function that updates the paralaxPosition based on how far the user has scrolled down the page.

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Step 3: Applying Styles Dynamically

Now that we have the updated position based on the scroll, we can construct our image styles dynamically using the state value:

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Final Implementation

Now, let’s tie it all together in the return statement of your component:

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Conclusion

By following these steps, you can successfully create a staggering parallax effect in your React application. Incorporating both useRef and useEffect allows you to dynamically update the position of the background image based on the user's scroll actions, providing a more interactive experience on your website. Don’t hesitate to test it out and customize it to fit your design needs!

Now it’s your turn to enhance that website with a visually appealing parallax effect!