Скачать или смотреть Changing Background Colour on Scroll: A Responsive Guide

Learn how to change the background color of a webpage dynamically as you scroll. This guide provides simple JavaScript and CSS solutions to make your webpage more interactive and responsive.
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This video is based on the question https://stackoverflow.com/q/63357394/ asked by the user 'vasilios' ( https://stackoverflow.com/u/12362083/ ) and on the answer https://stackoverflow.com/a/63357662/ provided by the user 'Patoumpalou' ( https://stackoverflow.com/u/11988379/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Changing Background Colour on Scroll: A Responsive Guide

If you've ever wanted to spice up your webpage with an interactive background change as you scroll, you're not alone! Changing the background color dynamically when certain elements come into view can enhance user experience and create a visually appealing interface. In this post, we'll delve into how you can achieve this effect using JavaScript and CSS, ensuring it works responsively across different devices.

The Problem at Hand

As a newcomer to JavaScript, you might find the challenge of changing the background color daunting, especially when you want it to adjust based on specific div elements reaching a certain point on the screen. Here's a summary of the task at hand:

Objective: Change the background color as specified div elements come within 150 pixels of the top of the browser window.

Challenge: Ensure responsiveness across various devices, as the positions of elements may change with different screen sizes.

The Solution

To tackle this, we will set up an event listener to monitor scrolling and change the background color accordingly. Let's break this down into manageable steps.

Step 1: Setting Up the HTML

First, make sure your HTML structure is ready. You'll have multiple div elements with unique IDs. Here's a sample structure for our example:

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

Step 2: CSS Styles

Next, define the default styles for your background and the styles for when the background changes. Here’s a simple CSS snippet:

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

Step 3: The JavaScript Logic

Now, let's implement the JavaScript that will monitor the scroll event and change the background color accordingly.

Add a Scroll Listener: We need to listen for the scroll event on the window.

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

Get Element Positions: Use getBoundingClientRect() to get the position of each div.

Compare Positions: In your scroll function, check how far down the page has been scrolled.

Here's the complete JavaScript function that combines all the pieces:

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

Conclusion

By implementing the steps outlined above, you'll be able to create a seamless and engaging experience for your users as they scroll through your website. With just a few lines of JavaScript and CSS, you can bring your webpage to life and achieve a responsive design that caters to various devices effectively.

Feel free to tweak the colors and experiment with different elements to see what works best for your project. Happy coding!