Скачать или смотреть How to Change SVG Fill Color When Scrolling Based on Background Color in React

Discover how to dynamically change SVG fill colors based on the background color of sections during scrolling in your React application. This guide provides practical solutions using IntersectionObserver.
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Changing SVG Fill Color on Scroll in a React Website

When building modern web applications, especially those utilizing frameworks like React, many developers seek to enhance user experience through interactive designs. One intriguing challenge is changing the color of SVG elements dynamically as sections change within the viewport while scrolling. This guide delves into a solution for altering the SVG fill color based on the background color of the sections in a React application.

The Problem

In a React application, when you implement a sticky navigation bar that overlays different colored sections, you might face the issue of maintaining visual consistency. For instance, you want your SVG icons to remain visible by changing their fill color to contrast appropriately with the changing background colors of the sections beneath.

This dilemma commonly arises when dealing with fixed elements like navigation bars, particularly when using CSS properties such as position: sticky. The goal is to dynamically adjust the SVG fill color based on the section currently occupying the viewport.

Example Scenario

Imagine you have sections with alternating light and dark backgrounds. In such a case, you need the SVG fill color to switch between black and white as the user scrolls through these sections.

The Solution

To achieve this effect, we can leverage the IntersectionObserver API, which provides a simple and efficient way to observe changes in the intersection of a target element with an ancestor element or with a top-level document's viewport.

Step-by-Step Breakdown

Step 1: Setting Up your HTML & CSS

First, let’s outline a basic structure for our React component. You will have a navigation bar with an SVG icon and a series of sticky sections:

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

CSS Setup:
Make sure to style your sections and the SVG properly so that they behave in a visually adequate manner:

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

Step 2: Implementing IntersectionObserver in JavaScript

Now, let’s incorporate the JavaScript functionality to change the SVG fill based on the current section in view. Here’s how you can do it:

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

In this implementation, the callback function checks if a target section is intersecting with the viewport. If so, it dynamically adjusts the SVG fill color to white or black based on the current section’s background class.

Conclusion

With the above steps, you can create a seamless scrolling experience that enhances both usability and aesthetics on your React website. The IntersectionObserver API is a powerful tool for efficiently managing dynamic styles based on user interaction with your site.

Now, your SVG colors will transition smoothly as users scroll through different sections, improving the overall visual appeal of your application. Happy coding!